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+<head><meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+<title>AbstractDatasetTest xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../../testapidocs/org/apache/commons/rdf/api/AbstractDatasetTest.html">View Javadoc</a></div><pre>
+<a class="jxr_linenumber" name="L1" href="#L1">1</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L2" href="#L2">2</a> <em class="jxr_javadoccomment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
+<a class="jxr_linenumber" name="L3" href="#L3">3</a> <em class="jxr_javadoccomment"> * or more contributor license agreements. See the NOTICE file</em>
+<a class="jxr_linenumber" name="L4" href="#L4">4</a> <em class="jxr_javadoccomment"> * distributed with this work for additional information</em>
+<a class="jxr_linenumber" name="L5" href="#L5">5</a> <em class="jxr_javadoccomment"> * regarding copyright ownership. The ASF licenses this file</em>
+<a class="jxr_linenumber" name="L6" href="#L6">6</a> <em class="jxr_javadoccomment"> * to you under the Apache License, Version 2.0 (the</em>
+<a class="jxr_linenumber" name="L7" href="#L7">7</a> <em class="jxr_javadoccomment"> * "License"); you may not use this file except in compliance</em>
+<a class="jxr_linenumber" name="L8" href="#L8">8</a> <em class="jxr_javadoccomment"> * with the License. You may obtain a copy of the License at</em>
+<a class="jxr_linenumber" name="L9" href="#L9">9</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="L10" href="#L10">10</a> <em class="jxr_javadoccomment"> * <a href="http://www.apache.org/licenses/LICENSE-2." target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.</a>0</em>
+<a class="jxr_linenumber" name="L11" href="#L11">11</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="L12" href="#L12">12</a> <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
+<a class="jxr_linenumber" name="L13" href="#L13">13</a> <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
+<a class="jxr_linenumber" name="L14" href="#L14">14</a> <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
+<a class="jxr_linenumber" name="L15" href="#L15">15</a> <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
+<a class="jxr_linenumber" name="L16" href="#L16">16</a> <em class="jxr_javadoccomment"> * limitations under the License.</em>
+<a class="jxr_linenumber" name="L17" href="#L17">17</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L18" href="#L18">18</a> <strong class="jxr_keyword">package</strong> org.apache.commons.rdf.api;
+<a class="jxr_linenumber" name="L19" href="#L19">19</a>
+<a class="jxr_linenumber" name="L20" href="#L20">20</a> <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.junit.Assert.*;
+<a class="jxr_linenumber" name="L21" href="#L21">21</a>
+<a class="jxr_linenumber" name="L22" href="#L22">22</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList;
+<a class="jxr_linenumber" name="L23" href="#L23">23</a> <strong class="jxr_keyword">import</strong> java.util.HashSet;
+<a class="jxr_linenumber" name="L24" href="#L24">24</a> <strong class="jxr_keyword">import</strong> java.util.Iterator;
+<a class="jxr_linenumber" name="L25" href="#L25">25</a> <strong class="jxr_keyword">import</strong> java.util.List;
+<a class="jxr_linenumber" name="L26" href="#L26">26</a> <strong class="jxr_keyword">import</strong> java.util.Map;
+<a class="jxr_linenumber" name="L27" href="#L27">27</a> <strong class="jxr_keyword">import</strong> java.util.Optional;
+<a class="jxr_linenumber" name="L28" href="#L28">28</a> <strong class="jxr_keyword">import</strong> java.util.Set;
+<a class="jxr_linenumber" name="L29" href="#L29">29</a> <strong class="jxr_keyword">import</strong> java.util.concurrent.ConcurrentHashMap;
+<a class="jxr_linenumber" name="L30" href="#L30">30</a> <strong class="jxr_keyword">import</strong> java.util.stream.Collectors;
+<a class="jxr_linenumber" name="L31" href="#L31">31</a> <strong class="jxr_keyword">import</strong> java.util.stream.Stream;
+<a class="jxr_linenumber" name="L32" href="#L32">32</a>
+<a class="jxr_linenumber" name="L33" href="#L33">33</a> <strong class="jxr_keyword">import</strong> org.junit.Assume;
+<a class="jxr_linenumber" name="L34" href="#L34">34</a> <strong class="jxr_keyword">import</strong> org.junit.Before;
+<a class="jxr_linenumber" name="L35" href="#L35">35</a> <strong class="jxr_keyword">import</strong> org.junit.Test;
+<a class="jxr_linenumber" name="L36" href="#L36">36</a>
+<a class="jxr_linenumber" name="L37" href="#L37">37</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L38" href="#L38">38</a> <em class="jxr_javadoccomment"> * Test Dataset implementation</em>
+<a class="jxr_linenumber" name="L39" href="#L39">39</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="L40" href="#L40">40</a> <em class="jxr_javadoccomment"> * To add to your implementation's tests, create a subclass with a name ending</em>
+<a class="jxr_linenumber" name="L41" href="#L41">41</a> <em class="jxr_javadoccomment"> * in <code>Test</code> and provide {@link #createFactory()} which minimally</em>
+<a class="jxr_linenumber" name="L42" href="#L42">42</a> <em class="jxr_javadoccomment"> * must support {@link RDF#createDataset()} and {@link RDF#createIRI(String)}, but</em>
+<a class="jxr_linenumber" name="L43" href="#L43">43</a> <em class="jxr_javadoccomment"> * ideally support all operations.</em>
+<a class="jxr_linenumber" name="L44" href="#L44">44</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="L45" href="#L45">45</a> <em class="jxr_javadoccomment"> * This test uses try-with-resources blocks for calls to {@link Dataset#stream()}</em>
+<a class="jxr_linenumber" name="L46" href="#L46">46</a> <em class="jxr_javadoccomment"> * and {@link Dataset#iterate()}.</em>
+<a class="jxr_linenumber" name="L47" href="#L47">47</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="L48" href="#L48">48</a> <em class="jxr_javadoccomment"> * @see Dataset</em>
+<a class="jxr_linenumber" name="L49" href="#L49">49</a> <em class="jxr_javadoccomment"> * @see RDF</em>
+<a class="jxr_linenumber" name="L50" href="#L50">50</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L51" href="#L51">51</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/commons/rdf/api/AbstractDatasetTest.html">AbstractDatasetTest</a> {
+<a class="jxr_linenumber" name="L52" href="#L52">52</a>
+<a class="jxr_linenumber" name="L53" href="#L53">53</a> <strong class="jxr_keyword">protected</strong> RDF factory;
+<a class="jxr_linenumber" name="L54" href="#L54">54</a> <strong class="jxr_keyword">protected</strong> Dataset dataset;
+<a class="jxr_linenumber" name="L55" href="#L55">55</a> <strong class="jxr_keyword">protected</strong> IRI alice;
+<a class="jxr_linenumber" name="L56" href="#L56">56</a> <strong class="jxr_keyword">protected</strong> IRI bob;
+<a class="jxr_linenumber" name="L57" href="#L57">57</a> <strong class="jxr_keyword">protected</strong> IRI name;
+<a class="jxr_linenumber" name="L58" href="#L58">58</a> <strong class="jxr_keyword">protected</strong> IRI knows;
+<a class="jxr_linenumber" name="L59" href="#L59">59</a> <strong class="jxr_keyword">protected</strong> IRI member;
+<a class="jxr_linenumber" name="L60" href="#L60">60</a> <strong class="jxr_keyword">protected</strong> BlankNode bnode1;
+<a class="jxr_linenumber" name="L61" href="#L61">61</a> <strong class="jxr_keyword">protected</strong> BlankNode bnode2;
+<a class="jxr_linenumber" name="L62" href="#L62">62</a> <strong class="jxr_keyword">protected</strong> Literal aliceName;
+<a class="jxr_linenumber" name="L63" href="#L63">63</a> <strong class="jxr_keyword">protected</strong> Literal bobName;
+<a class="jxr_linenumber" name="L64" href="#L64">64</a> <strong class="jxr_keyword">protected</strong> Literal secretClubName;
+<a class="jxr_linenumber" name="L65" href="#L65">65</a> <strong class="jxr_keyword">protected</strong> Literal companyName;
+<a class="jxr_linenumber" name="L66" href="#L66">66</a> <strong class="jxr_keyword">protected</strong> Quad bobNameQuad;
+<a class="jxr_linenumber" name="L67" href="#L67">67</a> <strong class="jxr_keyword">private</strong> IRI isPrimaryTopicOf;
+<a class="jxr_linenumber" name="L68" href="#L68">68</a> <strong class="jxr_keyword">private</strong> IRI graph1;
+<a class="jxr_linenumber" name="L69" href="#L69">69</a> <strong class="jxr_keyword">private</strong> BlankNode graph2;
+<a class="jxr_linenumber" name="L70" href="#L70">70</a>
+<a class="jxr_linenumber" name="L71" href="#L71">71</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L72" href="#L72">72</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="L73" href="#L73">73</a> <em class="jxr_javadoccomment"> * This method must be overridden by the implementing test to provide a</em>
+<a class="jxr_linenumber" name="L74" href="#L74">74</a> <em class="jxr_javadoccomment"> * factory for the test to create {@link Dataset}, {@link IRI} etc.</em>
+<a class="jxr_linenumber" name="L75" href="#L75">75</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="L76" href="#L76">76</a> <em class="jxr_javadoccomment"> * @return {@link RDF} instance to be tested.</em>
+<a class="jxr_linenumber" name="L77" href="#L77">77</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L78" href="#L78">78</a> <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">abstract</strong> RDF createFactory();
+<a class="jxr_linenumber" name="L79" href="#L79">79</a>
+<a class="jxr_linenumber" name="L80" href="#L80">80</a> @Before
+<a class="jxr_linenumber" name="L81" href="#L81">81</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> createDatasetAndAdd() {
+<a class="jxr_linenumber" name="L82" href="#L82">82</a> factory = createFactory();
+<a class="jxr_linenumber" name="L83" href="#L83">83</a> dataset = factory.createDataset();
+<a class="jxr_linenumber" name="L84" href="#L84">84</a> assertEquals(0, dataset.size());
+<a class="jxr_linenumber" name="L85" href="#L85">85</a>
+<a class="jxr_linenumber" name="L86" href="#L86">86</a> graph1 = factory.createIRI(<span class="jxr_string">"http://example.com/graph1"</span>);
+<a class="jxr_linenumber" name="L87" href="#L87">87</a> graph2 = factory.createBlankNode();
+<a class="jxr_linenumber" name="L88" href="#L88">88</a>
+<a class="jxr_linenumber" name="L89" href="#L89">89</a> alice = factory.createIRI(<span class="jxr_string">"http://example.com/alice"</span>);
+<a class="jxr_linenumber" name="L90" href="#L90">90</a> bob = factory.createIRI(<span class="jxr_string">"http://example.com/bob"</span>);
+<a class="jxr_linenumber" name="L91" href="#L91">91</a> name = factory.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/name"</span>);
+<a class="jxr_linenumber" name="L92" href="#L92">92</a> knows = factory.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/knows"</span>);
+<a class="jxr_linenumber" name="L93" href="#L93">93</a> member = factory.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/member"</span>);
+<a class="jxr_linenumber" name="L94" href="#L94">94</a> bnode1 = factory.createBlankNode(<span class="jxr_string">"org1"</span>);
+<a class="jxr_linenumber" name="L95" href="#L95">95</a> bnode2 = factory.createBlankNode(<span class="jxr_string">"org2"</span>);
+<a class="jxr_linenumber" name="L96" href="#L96">96</a>
+<a class="jxr_linenumber" name="L97" href="#L97">97</a> secretClubName = factory.createLiteral(<span class="jxr_string">"The Secret Club"</span>);
+<a class="jxr_linenumber" name="L98" href="#L98">98</a> companyName = factory.createLiteral(<span class="jxr_string">"A company"</span>);
+<a class="jxr_linenumber" name="L99" href="#L99">99</a> aliceName = factory.createLiteral(<span class="jxr_string">"Alice"</span>);
+<a class="jxr_linenumber" name="L100" href="#L100">100</a> bobName = factory.createLiteral(<span class="jxr_string">"Bob"</span>, <span class="jxr_string">"en-US"</span>);
+<a class="jxr_linenumber" name="L101" href="#L101">101</a>
+<a class="jxr_linenumber" name="L102" href="#L102">102</a> dataset.add(graph1, alice, name, aliceName);
+<a class="jxr_linenumber" name="L103" href="#L103">103</a> dataset.add(graph1, alice, knows, bob);
+<a class="jxr_linenumber" name="L104" href="#L104">104</a>
+<a class="jxr_linenumber" name="L105" href="#L105">105</a> dataset.add(graph1, alice, member, bnode1);
+<a class="jxr_linenumber" name="L106" href="#L106">106</a>
+<a class="jxr_linenumber" name="L107" href="#L107">107</a> bobNameQuad = factory.createQuad(graph2, bob, name, bobName);
+<a class="jxr_linenumber" name="L108" href="#L108">108</a> dataset.add(bobNameQuad);
+<a class="jxr_linenumber" name="L109" href="#L109">109</a>
+<a class="jxr_linenumber" name="L110" href="#L110">110</a> dataset.add(factory.createQuad(graph2, bob, member, bnode1));
+<a class="jxr_linenumber" name="L111" href="#L111">111</a> dataset.add(factory.createQuad(graph2, bob, member, bnode2));
+<a class="jxr_linenumber" name="L112" href="#L112">112</a> <em class="jxr_comment">// NOTE: bnode1 used in both graph1 and graph2</em>
+<a class="jxr_linenumber" name="L113" href="#L113">113</a> dataset.add(graph1, bnode1, name, secretClubName);
+<a class="jxr_linenumber" name="L114" href="#L114">114</a> dataset.add(graph2, bnode2, name, companyName);
+<a class="jxr_linenumber" name="L115" href="#L115">115</a>
+<a class="jxr_linenumber" name="L116" href="#L116">116</a> <em class="jxr_comment">// default graph describes graph1 and graph2 </em>
+<a class="jxr_linenumber" name="L117" href="#L117">117</a> isPrimaryTopicOf = factory.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/isPrimaryTopicOf"</span>);
+<a class="jxr_linenumber" name="L118" href="#L118">118</a> dataset.add(<strong class="jxr_keyword">null</strong>, alice, isPrimaryTopicOf, graph1);
+<a class="jxr_linenumber" name="L119" href="#L119">119</a> dataset.add(<strong class="jxr_keyword">null</strong>, bob, isPrimaryTopicOf, graph2);
+<a class="jxr_linenumber" name="L120" href="#L120">120</a>
+<a class="jxr_linenumber" name="L121" href="#L121">121</a>
+<a class="jxr_linenumber" name="L122" href="#L122">122</a> }
+<a class="jxr_linenumber" name="L123" href="#L123">123</a>
+<a class="jxr_linenumber" name="L124" href="#L124">124</a> @Test
+<a class="jxr_linenumber" name="L125" href="#L125">125</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> size() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L126" href="#L126">126</a> assertEquals(10, dataset.size());
+<a class="jxr_linenumber" name="L127" href="#L127">127</a> }
+<a class="jxr_linenumber" name="L128" href="#L128">128</a>
+<a class="jxr_linenumber" name="L129" href="#L129">129</a> @Test
+<a class="jxr_linenumber" name="L130" href="#L130">130</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> iterate() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L131" href="#L131">131</a> Assume.assumeTrue(dataset.size() > 0);
+<a class="jxr_linenumber" name="L132" href="#L132">132</a> <strong class="jxr_keyword">final</strong> List<Quad> quads = <strong class="jxr_keyword">new</strong> ArrayList<>();
+<a class="jxr_linenumber" name="L133" href="#L133">133</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">final</strong> Quad t : dataset.iterate()) {
+<a class="jxr_linenumber" name="L134" href="#L134">134</a> quads.add(t);
+<a class="jxr_linenumber" name="L135" href="#L135">135</a> }
+<a class="jxr_linenumber" name="L136" href="#L136">136</a> assertEquals(dataset.size(), quads.size());
+<a class="jxr_linenumber" name="L137" href="#L137">137</a>
+<a class="jxr_linenumber" name="L138" href="#L138">138</a> <em class="jxr_comment">//assertTrue(quads.contains(bobNameQuad));</em>
+<a class="jxr_linenumber" name="L139" href="#L139">139</a> <em class="jxr_comment">// java.util.List won't do any BlankNode mapping, so </em>
+<a class="jxr_linenumber" name="L140" href="#L140">140</a> <em class="jxr_comment">// instead bobNameQuad of let's check for an IRI-centric quad </em>
+<a class="jxr_linenumber" name="L141" href="#L141">141</a> <strong class="jxr_keyword">final</strong> Quad q = factory.createQuad(graph1, alice, name, aliceName);
+<a class="jxr_linenumber" name="L142" href="#L142">142</a> quads.contains(q);
+<a class="jxr_linenumber" name="L143" href="#L143">143</a>
+<a class="jxr_linenumber" name="L144" href="#L144">144</a> <em class="jxr_comment">// aborted iteration</em>
+<a class="jxr_linenumber" name="L145" href="#L145">145</a> <strong class="jxr_keyword">final</strong> Iterable<Quad> iterate = dataset.iterate();
+<a class="jxr_linenumber" name="L146" href="#L146">146</a> <strong class="jxr_keyword">final</strong> Iterator<Quad> it = iterate.iterator();
+<a class="jxr_linenumber" name="L147" href="#L147">147</a>
+<a class="jxr_linenumber" name="L148" href="#L148">148</a> assertTrue(it.hasNext());
+<a class="jxr_linenumber" name="L149" href="#L149">149</a> it.next();
+<a class="jxr_linenumber" name="L150" href="#L150">150</a> closeIterable(iterate);
+<a class="jxr_linenumber" name="L151" href="#L151">151</a>
+<a class="jxr_linenumber" name="L152" href="#L152">152</a> <em class="jxr_comment">// second iteration - should start from fresh and</em>
+<a class="jxr_linenumber" name="L153" href="#L153">153</a> <em class="jxr_comment">// get the same count</em>
+<a class="jxr_linenumber" name="L154" href="#L154">154</a> <strong class="jxr_keyword">long</strong> count = 0;
+<a class="jxr_linenumber" name="L155" href="#L155">155</a> <strong class="jxr_keyword">final</strong> Iterable<Quad> iterable = dataset.iterate();
+<a class="jxr_linenumber" name="L156" href="#L156">156</a> <strong class="jxr_keyword">for</strong> (@SuppressWarnings(<span class="jxr_string">"unused"</span>) <strong class="jxr_keyword">final</strong>
+<a class="jxr_linenumber" name="L157" href="#L157">157</a> Quad t : iterable) {
+<a class="jxr_linenumber" name="L158" href="#L158">158</a> count++;
+<a class="jxr_linenumber" name="L159" href="#L159">159</a> }
+<a class="jxr_linenumber" name="L160" href="#L160">160</a> assertEquals(dataset.size(), count);
+<a class="jxr_linenumber" name="L161" href="#L161">161</a> }
+<a class="jxr_linenumber" name="L162" href="#L162">162</a>
+<a class="jxr_linenumber" name="L163" href="#L163">163</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L164" href="#L164">164</a> <em class="jxr_javadoccomment"> * Special quad closing for RDF4J.</em>
+<a class="jxr_linenumber" name="L165" href="#L165">165</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L166" href="#L166">166</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> closeIterable(<strong class="jxr_keyword">final</strong> Iterable<Quad> iterate) <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L167" href="#L167">167</a> <strong class="jxr_keyword">if</strong> (iterate instanceof AutoCloseable) {
+<a class="jxr_linenumber" name="L168" href="#L168">168</a> ((AutoCloseable) iterate).close();
+<a class="jxr_linenumber" name="L169" href="#L169">169</a> }
+<a class="jxr_linenumber" name="L170" href="#L170">170</a> }
+<a class="jxr_linenumber" name="L171" href="#L171">171</a>
+<a class="jxr_linenumber" name="L172" href="#L172">172</a> @Test
+<a class="jxr_linenumber" name="L173" href="#L173">173</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> iterateFilter() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L174" href="#L174">174</a> <strong class="jxr_keyword">final</strong> List<RDFTerm> friends = <strong class="jxr_keyword">new</strong> ArrayList<>();
+<a class="jxr_linenumber" name="L175" href="#L175">175</a> <strong class="jxr_keyword">final</strong> IRI alice = factory.createIRI(<span class="jxr_string">"http://example.com/alice"</span>);
+<a class="jxr_linenumber" name="L176" href="#L176">176</a> <strong class="jxr_keyword">final</strong> IRI knows = factory.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/knows"</span>);
+<a class="jxr_linenumber" name="L177" href="#L177">177</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">final</strong> Quad t : dataset.iterate(<strong class="jxr_keyword">null</strong>, alice, knows, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L178" href="#L178">178</a> friends.add(t.getObject());
+<a class="jxr_linenumber" name="L179" href="#L179">179</a> }
+<a class="jxr_linenumber" name="L180" href="#L180">180</a> assertEquals(1, friends.size());
+<a class="jxr_linenumber" name="L181" href="#L181">181</a> assertEquals(bob, friends.get(0));
+<a class="jxr_linenumber" name="L182" href="#L182">182</a>
+<a class="jxr_linenumber" name="L183" href="#L183">183</a> <em class="jxr_comment">// .. can we iterate over zero hits?</em>
+<a class="jxr_linenumber" name="L184" href="#L184">184</a> <strong class="jxr_keyword">final</strong> Iterable<Quad> iterate = dataset.iterate(Optional.of(graph2), bob, knows, alice);
+<a class="jxr_linenumber" name="L185" href="#L185">185</a> <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">final</strong> Quad unexpected : iterate) {
+<a class="jxr_linenumber" name="L186" href="#L186">186</a> fail(<span class="jxr_string">"Unexpected quad "</span> + unexpected);
+<a class="jxr_linenumber" name="L187" href="#L187">187</a> }
+<a class="jxr_linenumber" name="L188" href="#L188">188</a> <em class="jxr_comment">// closeIterable(iterate);</em>
+<a class="jxr_linenumber" name="L189" href="#L189">189</a> }
+<a class="jxr_linenumber" name="L190" href="#L190">190</a>
+<a class="jxr_linenumber" name="L191" href="#L191">191</a> @Test
+<a class="jxr_linenumber" name="L192" href="#L192">192</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> contains() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L193" href="#L193">193</a> assertFalse(dataset.contains(<strong class="jxr_keyword">null</strong>, bob, knows, alice)); <em class="jxr_comment">// or so he claims..</em>
+<a class="jxr_linenumber" name="L194" href="#L194">194</a>
+<a class="jxr_linenumber" name="L195" href="#L195">195</a> assertTrue(dataset.contains(Optional.of(graph1), alice, knows, bob));
+<a class="jxr_linenumber" name="L196" href="#L196">196</a>
+<a class="jxr_linenumber" name="L197" href="#L197">197</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream()) {
+<a class="jxr_linenumber" name="L198" href="#L198">198</a> <strong class="jxr_keyword">final</strong> Optional<? <strong class="jxr_keyword">extends</strong> Quad> first = stream.skip(4).findFirst();
+<a class="jxr_linenumber" name="L199" href="#L199">199</a> Assume.assumeTrue(first.isPresent());
+<a class="jxr_linenumber" name="L200" href="#L200">200</a> <strong class="jxr_keyword">final</strong> Quad existingQuad = first.get();
+<a class="jxr_linenumber" name="L201" href="#L201">201</a> assertTrue(dataset.contains(existingQuad));
+<a class="jxr_linenumber" name="L202" href="#L202">202</a> }
+<a class="jxr_linenumber" name="L203" href="#L203">203</a>
+<a class="jxr_linenumber" name="L204" href="#L204">204</a> <strong class="jxr_keyword">final</strong> Quad nonExistingQuad = factory.createQuad(graph2, bob, knows, alice);
+<a class="jxr_linenumber" name="L205" href="#L205">205</a> assertFalse(dataset.contains(nonExistingQuad));
+<a class="jxr_linenumber" name="L206" href="#L206">206</a>
+<a class="jxr_linenumber" name="L207" href="#L207">207</a> <em class="jxr_comment">// An existing quad</em>
+<a class="jxr_linenumber" name="L208" href="#L208">208</a> <strong class="jxr_keyword">final</strong> Quad quad = factory.createQuad(graph1, alice, knows, bob);
+<a class="jxr_linenumber" name="L209" href="#L209">209</a> <em class="jxr_comment">// FIXME: Should not this always be true?</em>
+<a class="jxr_linenumber" name="L210" href="#L210">210</a> assertTrue(dataset.contains(quad));
+<a class="jxr_linenumber" name="L211" href="#L211">211</a> }
+<a class="jxr_linenumber" name="L212" href="#L212">212</a>
+<a class="jxr_linenumber" name="L213" href="#L213">213</a> @Test
+<a class="jxr_linenumber" name="L214" href="#L214">214</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> remove() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L215" href="#L215">215</a> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> fullSize = dataset.size();
+<a class="jxr_linenumber" name="L216" href="#L216">216</a> dataset.remove(Optional.of(graph1), alice, knows, bob);
+<a class="jxr_linenumber" name="L217" href="#L217">217</a> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> shrunkSize = dataset.size();
+<a class="jxr_linenumber" name="L218" href="#L218">218</a> assertEquals(1, fullSize - shrunkSize);
+<a class="jxr_linenumber" name="L219" href="#L219">219</a>
+<a class="jxr_linenumber" name="L220" href="#L220">220</a> dataset.remove(Optional.of(graph1), alice, knows, bob);
+<a class="jxr_linenumber" name="L221" href="#L221">221</a> assertEquals(shrunkSize, dataset.size()); <em class="jxr_comment">// unchanged</em>
+<a class="jxr_linenumber" name="L222" href="#L222">222</a>
+<a class="jxr_linenumber" name="L223" href="#L223">223</a> dataset.add(graph1, alice, knows, bob);
+<a class="jxr_linenumber" name="L224" href="#L224">224</a> dataset.add(graph2, alice, knows, bob);
+<a class="jxr_linenumber" name="L225" href="#L225">225</a> dataset.add(graph2, alice, knows, bob);
+<a class="jxr_linenumber" name="L226" href="#L226">226</a> <em class="jxr_comment">// Undetermined size at this point -- but at least it</em>
+<a class="jxr_linenumber" name="L227" href="#L227">227</a> <em class="jxr_comment">// should be bigger</em>
+<a class="jxr_linenumber" name="L228" href="#L228">228</a> assertTrue(dataset.size() > shrunkSize);
+<a class="jxr_linenumber" name="L229" href="#L229">229</a>
+<a class="jxr_linenumber" name="L230" href="#L230">230</a> <em class="jxr_comment">// and after a single remove they should all be gone</em>
+<a class="jxr_linenumber" name="L231" href="#L231">231</a> dataset.remove(<strong class="jxr_keyword">null</strong>, alice, knows, bob);
+<a class="jxr_linenumber" name="L232" href="#L232">232</a> assertEquals(shrunkSize, dataset.size());
+<a class="jxr_linenumber" name="L233" href="#L233">233</a>
+<a class="jxr_linenumber" name="L234" href="#L234">234</a> Quad otherQuad;
+<a class="jxr_linenumber" name="L235" href="#L235">235</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream()) {
+<a class="jxr_linenumber" name="L236" href="#L236">236</a> <strong class="jxr_keyword">final</strong> Optional<? <strong class="jxr_keyword">extends</strong> Quad> anyQuad = stream.findAny();
+<a class="jxr_linenumber" name="L237" href="#L237">237</a> Assume.assumeTrue(anyQuad.isPresent());
+<a class="jxr_linenumber" name="L238" href="#L238">238</a> otherQuad = anyQuad.get();
+<a class="jxr_linenumber" name="L239" href="#L239">239</a> }
+<a class="jxr_linenumber" name="L240" href="#L240">240</a>
+<a class="jxr_linenumber" name="L241" href="#L241">241</a> dataset.remove(otherQuad);
+<a class="jxr_linenumber" name="L242" href="#L242">242</a> assertEquals(shrunkSize - 1, dataset.size());
+<a class="jxr_linenumber" name="L243" href="#L243">243</a> dataset.remove(otherQuad);
+<a class="jxr_linenumber" name="L244" href="#L244">244</a> assertEquals(shrunkSize - 1, dataset.size()); <em class="jxr_comment">// no change</em>
+<a class="jxr_linenumber" name="L245" href="#L245">245</a>
+<a class="jxr_linenumber" name="L246" href="#L246">246</a> <em class="jxr_comment">// for some reason in rdf4j this causes duplicates!</em>
+<a class="jxr_linenumber" name="L247" href="#L247">247</a> dataset.add(otherQuad);
+<a class="jxr_linenumber" name="L248" href="#L248">248</a> <em class="jxr_comment">// dataset.stream().forEach(System.out::println);</em>
+<a class="jxr_linenumber" name="L249" href="#L249">249</a> <em class="jxr_comment">// should have increased</em>
+<a class="jxr_linenumber" name="L250" href="#L250">250</a> assertTrue(dataset.size() >= shrunkSize);
+<a class="jxr_linenumber" name="L251" href="#L251">251</a> }
+<a class="jxr_linenumber" name="L252" href="#L252">252</a>
+<a class="jxr_linenumber" name="L253" href="#L253">253</a> @Test
+<a class="jxr_linenumber" name="L254" href="#L254">254</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clear() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L255" href="#L255">255</a> dataset.clear();
+<a class="jxr_linenumber" name="L256" href="#L256">256</a> assertFalse(dataset.contains(<strong class="jxr_keyword">null</strong>, alice, knows, bob));
+<a class="jxr_linenumber" name="L257" href="#L257">257</a> assertEquals(0, dataset.size());
+<a class="jxr_linenumber" name="L258" href="#L258">258</a> dataset.clear(); <em class="jxr_comment">// no-op</em>
+<a class="jxr_linenumber" name="L259" href="#L259">259</a> assertEquals(0, dataset.size());
+<a class="jxr_linenumber" name="L260" href="#L260">260</a> assertFalse(dataset.contains(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>)); <em class="jxr_comment">// nothing here</em>
+<a class="jxr_linenumber" name="L261" href="#L261">261</a> }
+<a class="jxr_linenumber" name="L262" href="#L262">262</a>
+<a class="jxr_linenumber" name="L263" href="#L263">263</a> @Test
+<a class="jxr_linenumber" name="L264" href="#L264">264</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getQuads() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L265" href="#L265">265</a> <strong class="jxr_keyword">long</strong> quadCount;
+<a class="jxr_linenumber" name="L266" href="#L266">266</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream()) {
+<a class="jxr_linenumber" name="L267" href="#L267">267</a> quadCount = stream.count();
+<a class="jxr_linenumber" name="L268" href="#L268">268</a> }
+<a class="jxr_linenumber" name="L269" href="#L269">269</a> assertTrue(quadCount > 0);
+<a class="jxr_linenumber" name="L270" href="#L270">270</a>
+<a class="jxr_linenumber" name="L271" href="#L271">271</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream()) {
+<a class="jxr_linenumber" name="L272" href="#L272">272</a> assertTrue(stream.allMatch(t -> dataset.contains(t)));
+<a class="jxr_linenumber" name="L273" href="#L273">273</a> }
+<a class="jxr_linenumber" name="L274" href="#L274">274</a>
+<a class="jxr_linenumber" name="L275" href="#L275">275</a> <em class="jxr_comment">// Check exact count</em>
+<a class="jxr_linenumber" name="L276" href="#L276">276</a> Assume.assumeNotNull(bnode1, bnode2, aliceName, bobName, secretClubName, companyName, bobNameQuad);
+<a class="jxr_linenumber" name="L277" href="#L277">277</a> assertEquals(10, quadCount);
+<a class="jxr_linenumber" name="L278" href="#L278">278</a> }
+<a class="jxr_linenumber" name="L279" href="#L279">279</a>
+<a class="jxr_linenumber" name="L280" href="#L280">280</a> @Test
+<a class="jxr_linenumber" name="L281" href="#L281">281</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getQuadsQuery() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L282" href="#L282">282</a>
+<a class="jxr_linenumber" name="L283" href="#L283">283</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream(Optional.of(graph1), alice, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L284" href="#L284">284</a> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> aliceCount = stream.count();
+<a class="jxr_linenumber" name="L285" href="#L285">285</a> assertTrue(aliceCount > 0);
+<a class="jxr_linenumber" name="L286" href="#L286">286</a> Assume.assumeNotNull(aliceName);
+<a class="jxr_linenumber" name="L287" href="#L287">287</a> assertEquals(3, aliceCount);
+<a class="jxr_linenumber" name="L288" href="#L288">288</a> }
+<a class="jxr_linenumber" name="L289" href="#L289">289</a>
+<a class="jxr_linenumber" name="L290" href="#L290">290</a> Assume.assumeNotNull(bnode1, bnode2, bobName, companyName, secretClubName);
+<a class="jxr_linenumber" name="L291" href="#L291">291</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, name, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L292" href="#L292">292</a> assertEquals(4, stream.count());
+<a class="jxr_linenumber" name="L293" href="#L293">293</a> }
+<a class="jxr_linenumber" name="L294" href="#L294">294</a> Assume.assumeNotNull(bnode1);
+<a class="jxr_linenumber" name="L295" href="#L295">295</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, member, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L296" href="#L296">296</a> assertEquals(3, stream.count());
+<a class="jxr_linenumber" name="L297" href="#L297">297</a> }
+<a class="jxr_linenumber" name="L298" href="#L298">298</a> }
+<a class="jxr_linenumber" name="L299" href="#L299">299</a>
+<a class="jxr_linenumber" name="L300" href="#L300">300</a> @Test
+<a class="jxr_linenumber" name="L301" href="#L301">301</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addBlankNodesFromMultipleDatasets() {
+<a class="jxr_linenumber" name="L302" href="#L302">302</a> <em class="jxr_comment">// Create two separate Dataset instances</em>
+<a class="jxr_linenumber" name="L303" href="#L303">303</a> <strong class="jxr_keyword">final</strong> Dataset g1 = createDataset1();
+<a class="jxr_linenumber" name="L304" href="#L304">304</a> <strong class="jxr_keyword">final</strong> Dataset g2 = createDataset2();
+<a class="jxr_linenumber" name="L305" href="#L305">305</a>
+<a class="jxr_linenumber" name="L306" href="#L306">306</a> <em class="jxr_comment">// and add them to a new Dataset g3</em>
+<a class="jxr_linenumber" name="L307" href="#L307">307</a> <strong class="jxr_keyword">final</strong> Dataset g3 = factory.createDataset();
+<a class="jxr_linenumber" name="L308" href="#L308">308</a> addAllQuads(g1, g3);
+<a class="jxr_linenumber" name="L309" href="#L309">309</a> addAllQuads(g2, g3);
+<a class="jxr_linenumber" name="L310" href="#L310">310</a>
+<a class="jxr_linenumber" name="L311" href="#L311">311</a> <em class="jxr_comment">// Let's make a map to find all those blank nodes after insertion</em>
+<a class="jxr_linenumber" name="L312" href="#L312">312</a> <em class="jxr_comment">// (The Dataset implementation is not currently required to</em>
+<a class="jxr_linenumber" name="L313" href="#L313">313</a> <em class="jxr_comment">// keep supporting those BlankNodes with contains() - see</em>
+<a class="jxr_linenumber" name="L314" href="#L314">314</a> <em class="jxr_comment">// COMMONSRDF-15)</em>
+<a class="jxr_linenumber" name="L315" href="#L315">315</a>
+<a class="jxr_linenumber" name="L316" href="#L316">316</a> <strong class="jxr_keyword">final</strong> Map<String, BlankNodeOrIRI> whoIsWho = <strong class="jxr_keyword">new</strong> ConcurrentHashMap<>();
+<a class="jxr_linenumber" name="L317" href="#L317">317</a> <em class="jxr_comment">// ConcurrentHashMap as we will try parallel forEach below,</em>
+<a class="jxr_linenumber" name="L318" href="#L318">318</a> <em class="jxr_comment">// which should not give inconsistent results (it does with a</em>
+<a class="jxr_linenumber" name="L319" href="#L319">319</a> <em class="jxr_comment">// HashMap!)</em>
+<a class="jxr_linenumber" name="L320" href="#L320">320</a>
+<a class="jxr_linenumber" name="L321" href="#L321">321</a> <em class="jxr_comment">// look up BlankNodes by name</em>
+<a class="jxr_linenumber" name="L322" href="#L322">322</a> <strong class="jxr_keyword">final</strong> IRI name = factory.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/name"</span>);
+<a class="jxr_linenumber" name="L323" href="#L323">323</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = g3.stream(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, name, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L324" href="#L324">324</a> stream.parallel().forEach(t -> whoIsWho.put(t.getObject().ntriplesString(), t.getSubject()));
+<a class="jxr_linenumber" name="L325" href="#L325">325</a> }
+<a class="jxr_linenumber" name="L326" href="#L326">326</a>
+<a class="jxr_linenumber" name="L327" href="#L327">327</a> assertEquals(4, whoIsWho.size());
+<a class="jxr_linenumber" name="L328" href="#L328">328</a> <em class="jxr_comment">// and contains 4 unique values</em>
+<a class="jxr_linenumber" name="L329" href="#L329">329</a> assertEquals(4, <strong class="jxr_keyword">new</strong> HashSet<>(whoIsWho.values()).size());
+<a class="jxr_linenumber" name="L330" href="#L330">330</a>
+<a class="jxr_linenumber" name="L331" href="#L331">331</a> <strong class="jxr_keyword">final</strong> BlankNodeOrIRI b1Alice = whoIsWho.get(<span class="jxr_string">"\"Alice\""</span>);
+<a class="jxr_linenumber" name="L332" href="#L332">332</a> assertNotNull(b1Alice);
+<a class="jxr_linenumber" name="L333" href="#L333">333</a> <strong class="jxr_keyword">final</strong> BlankNodeOrIRI b2Bob = whoIsWho.get(<span class="jxr_string">"\"Bob\""</span>);
+<a class="jxr_linenumber" name="L334" href="#L334">334</a> assertNotNull(b2Bob);
+<a class="jxr_linenumber" name="L335" href="#L335">335</a> <strong class="jxr_keyword">final</strong> BlankNodeOrIRI b1Charlie = whoIsWho.get(<span class="jxr_string">"\"Charlie\""</span>);
+<a class="jxr_linenumber" name="L336" href="#L336">336</a> assertNotNull(b1Charlie);
+<a class="jxr_linenumber" name="L337" href="#L337">337</a> <strong class="jxr_keyword">final</strong> BlankNodeOrIRI b2Dave = whoIsWho.get(<span class="jxr_string">"\"Dave\""</span>);
+<a class="jxr_linenumber" name="L338" href="#L338">338</a> assertNotNull(b2Dave);
+<a class="jxr_linenumber" name="L339" href="#L339">339</a>
+<a class="jxr_linenumber" name="L340" href="#L340">340</a> <em class="jxr_comment">// All blank nodes should differ</em>
+<a class="jxr_linenumber" name="L341" href="#L341">341</a> notEquals(b1Alice, b2Bob);
+<a class="jxr_linenumber" name="L342" href="#L342">342</a> notEquals(b1Alice, b1Charlie);
+<a class="jxr_linenumber" name="L343" href="#L343">343</a> notEquals(b1Alice, b2Dave);
+<a class="jxr_linenumber" name="L344" href="#L344">344</a> notEquals(b2Bob, b1Charlie);
+<a class="jxr_linenumber" name="L345" href="#L345">345</a> notEquals(b2Bob, b2Dave);
+<a class="jxr_linenumber" name="L346" href="#L346">346</a> notEquals(b1Charlie, b2Dave);
+<a class="jxr_linenumber" name="L347" href="#L347">347</a>
+<a class="jxr_linenumber" name="L348" href="#L348">348</a> <em class="jxr_comment">// And we should be able to query with them again</em>
+<a class="jxr_linenumber" name="L349" href="#L349">349</a> <em class="jxr_comment">// as we got them back from g3</em>
+<a class="jxr_linenumber" name="L350" href="#L350">350</a> <strong class="jxr_keyword">final</strong> IRI hasChild = factory.createIRI(<span class="jxr_string">"http://example.com/hasChild"</span>);
+<a class="jxr_linenumber" name="L351" href="#L351">351</a> <em class="jxr_comment">// FIXME: Check graph2 BlankNode in these ..?</em>
+<a class="jxr_linenumber" name="L352" href="#L352">352</a> assertTrue(g3.contains(<strong class="jxr_keyword">null</strong>, b1Alice, hasChild, b2Bob));
+<a class="jxr_linenumber" name="L353" href="#L353">353</a> assertTrue(g3.contains(<strong class="jxr_keyword">null</strong>, b2Dave, hasChild, b1Charlie));
+<a class="jxr_linenumber" name="L354" href="#L354">354</a> <em class="jxr_comment">// But not</em>
+<a class="jxr_linenumber" name="L355" href="#L355">355</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b1Alice, hasChild, b1Alice));
+<a class="jxr_linenumber" name="L356" href="#L356">356</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b1Alice, hasChild, b1Charlie));
+<a class="jxr_linenumber" name="L357" href="#L357">357</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b1Alice, hasChild, b2Dave));
+<a class="jxr_linenumber" name="L358" href="#L358">358</a> <em class="jxr_comment">// nor</em>
+<a class="jxr_linenumber" name="L359" href="#L359">359</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b2Dave, hasChild, b1Alice));
+<a class="jxr_linenumber" name="L360" href="#L360">360</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b2Dave, hasChild, b1Alice));
+<a class="jxr_linenumber" name="L361" href="#L361">361</a>
+<a class="jxr_linenumber" name="L362" href="#L362">362</a> <em class="jxr_comment">// and these don't have any children (as far as we know)</em>
+<a class="jxr_linenumber" name="L363" href="#L363">363</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b2Bob, hasChild, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L364" href="#L364">364</a> assertFalse(g3.contains(<strong class="jxr_keyword">null</strong>, b1Charlie, hasChild, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L365" href="#L365">365</a> }
+<a class="jxr_linenumber" name="L366" href="#L366">366</a>
+<a class="jxr_linenumber" name="L367" href="#L367">367</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> notEquals(<strong class="jxr_keyword">final</strong> BlankNodeOrIRI node1, <strong class="jxr_keyword">final</strong> BlankNodeOrIRI node2) {
+<a class="jxr_linenumber" name="L368" href="#L368">368</a> assertFalse(node1.equals(node2));
+<a class="jxr_linenumber" name="L369" href="#L369">369</a> <em class="jxr_comment">// in which case we should be able to assume</em>
+<a class="jxr_linenumber" name="L370" href="#L370">370</a> <em class="jxr_comment">// (as they are in the same dataset)</em>
+<a class="jxr_linenumber" name="L371" href="#L371">371</a> assertFalse(node1.ntriplesString().equals(node2.ntriplesString()));
+<a class="jxr_linenumber" name="L372" href="#L372">372</a> }
+<a class="jxr_linenumber" name="L373" href="#L373">373</a>
+<a class="jxr_linenumber" name="L374" href="#L374">374</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L375" href="#L375">375</a> <em class="jxr_javadoccomment"> * Add all quads from the source to the target.</em>
+<a class="jxr_linenumber" name="L376" href="#L376">376</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="L377" href="#L377">377</a> <em class="jxr_javadoccomment"> * The quads may be copied in any order. No special conversion or</em>
+<a class="jxr_linenumber" name="L378" href="#L378">378</a> <em class="jxr_javadoccomment"> * adaptation of {@link BlankNode}s are performed.</em>
+<a class="jxr_linenumber" name="L379" href="#L379">379</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="L380" href="#L380">380</a> <em class="jxr_javadoccomment"> * @param source</em>
+<a class="jxr_linenumber" name="L381" href="#L381">381</a> <em class="jxr_javadoccomment"> * Source Dataset to copy quads from</em>
+<a class="jxr_linenumber" name="L382" href="#L382">382</a> <em class="jxr_javadoccomment"> * @param target</em>
+<a class="jxr_linenumber" name="L383" href="#L383">383</a> <em class="jxr_javadoccomment"> * Target Dataset where quads will be added</em>
+<a class="jxr_linenumber" name="L384" href="#L384">384</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L385" href="#L385">385</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> addAllQuads(<strong class="jxr_keyword">final</strong> Dataset source, <strong class="jxr_keyword">final</strong> Dataset target) {
+<a class="jxr_linenumber" name="L386" href="#L386">386</a>
+<a class="jxr_linenumber" name="L387" href="#L387">387</a> <em class="jxr_comment">// unordered() as we don't need to preserve quad order</em>
+<a class="jxr_linenumber" name="L388" href="#L388">388</a> <em class="jxr_comment">// sequential() as we don't (currently) require target Dataset to be</em>
+<a class="jxr_linenumber" name="L389" href="#L389">389</a> <em class="jxr_comment">// thread-safe</em>
+<a class="jxr_linenumber" name="L390" href="#L390">390</a>
+<a class="jxr_linenumber" name="L391" href="#L391">391</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = source.stream()) {
+<a class="jxr_linenumber" name="L392" href="#L392">392</a> stream.unordered().sequential().forEach(t -> target.add(t));
+<a class="jxr_linenumber" name="L393" href="#L393">393</a> }
+<a class="jxr_linenumber" name="L394" href="#L394">394</a> }
+<a class="jxr_linenumber" name="L395" href="#L395">395</a>
+<a class="jxr_linenumber" name="L396" href="#L396">396</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L397" href="#L397">397</a> <em class="jxr_javadoccomment"> * Make a new dataset with two BlankNodes - each with a different</em>
+<a class="jxr_linenumber" name="L398" href="#L398">398</a> <em class="jxr_javadoccomment"> * uniqueReference</em>
+<a class="jxr_linenumber" name="L399" href="#L399">399</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L400" href="#L400">400</a> <strong class="jxr_keyword">private</strong> Dataset createDataset1() {
+<a class="jxr_linenumber" name="L401" href="#L401">401</a> <strong class="jxr_keyword">final</strong> RDF factory1 = createFactory();
+<a class="jxr_linenumber" name="L402" href="#L402">402</a>
+<a class="jxr_linenumber" name="L403" href="#L403">403</a> <strong class="jxr_keyword">final</strong> IRI name = factory1.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/name"</span>);
+<a class="jxr_linenumber" name="L404" href="#L404">404</a> <strong class="jxr_keyword">final</strong> Dataset g1 = factory1.createDataset();
+<a class="jxr_linenumber" name="L405" href="#L405">405</a> <strong class="jxr_keyword">final</strong> BlankNode b1 = createOwnBlankNode(<span class="jxr_string">"b1"</span>, <span class="jxr_string">"0240eaaa-d33e-4fc0-a4f1-169d6ced3680"</span>);
+<a class="jxr_linenumber" name="L406" href="#L406">406</a> g1.add(b1, b1, name, factory1.createLiteral(<span class="jxr_string">"Alice"</span>));
+<a class="jxr_linenumber" name="L407" href="#L407">407</a>
+<a class="jxr_linenumber" name="L408" href="#L408">408</a> <strong class="jxr_keyword">final</strong> BlankNode b2 = createOwnBlankNode(<span class="jxr_string">"b2"</span>, <span class="jxr_string">"9de7db45-0ce7-4b0f-a1ce-c9680ffcfd9f"</span>);
+<a class="jxr_linenumber" name="L409" href="#L409">409</a> g1.add(b2, b2, name, factory1.createLiteral(<span class="jxr_string">"Bob"</span>));
+<a class="jxr_linenumber" name="L410" href="#L410">410</a>
+<a class="jxr_linenumber" name="L411" href="#L411">411</a> <strong class="jxr_keyword">final</strong> IRI hasChild = factory1.createIRI(<span class="jxr_string">"http://example.com/hasChild"</span>);
+<a class="jxr_linenumber" name="L412" href="#L412">412</a> g1.add(<strong class="jxr_keyword">null</strong>, b1, hasChild, b2);
+<a class="jxr_linenumber" name="L413" href="#L413">413</a>
+<a class="jxr_linenumber" name="L414" href="#L414">414</a> <strong class="jxr_keyword">return</strong> g1;
+<a class="jxr_linenumber" name="L415" href="#L415">415</a> }
+<a class="jxr_linenumber" name="L416" href="#L416">416</a>
+<a class="jxr_linenumber" name="L417" href="#L417">417</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L418" href="#L418">418</a> <em class="jxr_javadoccomment"> * Create a different implementation of BlankNode to be tested with</em>
+<a class="jxr_linenumber" name="L419" href="#L419">419</a> <em class="jxr_javadoccomment"> * dataset.add(a,b,c); (the implementation may or may not then choose to</em>
+<a class="jxr_linenumber" name="L420" href="#L420">420</a> <em class="jxr_javadoccomment"> * translate such to its own instances)</em>
+<a class="jxr_linenumber" name="L421" href="#L421">421</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="L422" href="#L422">422</a> <em class="jxr_javadoccomment"> * @param name</em>
+<a class="jxr_linenumber" name="L423" href="#L423">423</a> <em class="jxr_javadoccomment"> * @return</em>
+<a class="jxr_linenumber" name="L424" href="#L424">424</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L425" href="#L425">425</a> <strong class="jxr_keyword">private</strong> BlankNode createOwnBlankNode(<strong class="jxr_keyword">final</strong> String name, <strong class="jxr_keyword">final</strong> String uuid) {
+<a class="jxr_linenumber" name="L426" href="#L426">426</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> BlankNode() {
+<a class="jxr_linenumber" name="L427" href="#L427">427</a> @Override
+<a class="jxr_linenumber" name="L428" href="#L428">428</a> <strong class="jxr_keyword">public</strong> String ntriplesString() {
+<a class="jxr_linenumber" name="L429" href="#L429">429</a> <strong class="jxr_keyword">return</strong> <span class="jxr_string">"_: "</span> + name;
+<a class="jxr_linenumber" name="L430" href="#L430">430</a> }
+<a class="jxr_linenumber" name="L431" href="#L431">431</a>
+<a class="jxr_linenumber" name="L432" href="#L432">432</a> @Override
+<a class="jxr_linenumber" name="L433" href="#L433">433</a> <strong class="jxr_keyword">public</strong> String uniqueReference() {
+<a class="jxr_linenumber" name="L434" href="#L434">434</a> <strong class="jxr_keyword">return</strong> uuid;
+<a class="jxr_linenumber" name="L435" href="#L435">435</a> }
+<a class="jxr_linenumber" name="L436" href="#L436">436</a>
+<a class="jxr_linenumber" name="L437" href="#L437">437</a> @Override
+<a class="jxr_linenumber" name="L438" href="#L438">438</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> hashCode() {
+<a class="jxr_linenumber" name="L439" href="#L439">439</a> <strong class="jxr_keyword">return</strong> uuid.hashCode();
+<a class="jxr_linenumber" name="L440" href="#L440">440</a> }
+<a class="jxr_linenumber" name="L441" href="#L441">441</a>
+<a class="jxr_linenumber" name="L442" href="#L442">442</a> @Override
+<a class="jxr_linenumber" name="L443" href="#L443">443</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> equals(<strong class="jxr_keyword">final</strong> Object obj) {
+<a class="jxr_linenumber" name="L444" href="#L444">444</a> <strong class="jxr_keyword">if</strong> (!(obj instanceof BlankNode)) {
+<a class="jxr_linenumber" name="L445" href="#L445">445</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="L446" href="#L446">446</a> }
+<a class="jxr_linenumber" name="L447" href="#L447">447</a> <strong class="jxr_keyword">final</strong> BlankNode other = (BlankNode) obj;
+<a class="jxr_linenumber" name="L448" href="#L448">448</a> <strong class="jxr_keyword">return</strong> uuid.equals(other.uniqueReference());
+<a class="jxr_linenumber" name="L449" href="#L449">449</a> }
+<a class="jxr_linenumber" name="L450" href="#L450">450</a> };
+<a class="jxr_linenumber" name="L451" href="#L451">451</a> }
+<a class="jxr_linenumber" name="L452" href="#L452">452</a>
+<a class="jxr_linenumber" name="L453" href="#L453">453</a> <strong class="jxr_keyword">private</strong> Dataset createDataset2() {
+<a class="jxr_linenumber" name="L454" href="#L454">454</a> <strong class="jxr_keyword">final</strong> RDF factory2 = createFactory();
+<a class="jxr_linenumber" name="L455" href="#L455">455</a> <strong class="jxr_keyword">final</strong> IRI name = factory2.createIRI(<span class="jxr_string">"http://xmlns.com/foaf/0.1/name"</span>);
+<a class="jxr_linenumber" name="L456" href="#L456">456</a>
+<a class="jxr_linenumber" name="L457" href="#L457">457</a> <strong class="jxr_keyword">final</strong> Dataset g2 = factory2.createDataset();
+<a class="jxr_linenumber" name="L458" href="#L458">458</a>
+<a class="jxr_linenumber" name="L459" href="#L459">459</a> <strong class="jxr_keyword">final</strong> BlankNode b1 = createOwnBlankNode(<span class="jxr_string">"b1"</span>, <span class="jxr_string">"bc8d3e45-a08f-421d-85b3-c25b373abf87"</span>);
+<a class="jxr_linenumber" name="L460" href="#L460">460</a> g2.add(b1, b1, name, factory2.createLiteral(<span class="jxr_string">"Charlie"</span>));
+<a class="jxr_linenumber" name="L461" href="#L461">461</a>
+<a class="jxr_linenumber" name="L462" href="#L462">462</a> <strong class="jxr_keyword">final</strong> BlankNode b2 = createOwnBlankNode(<span class="jxr_string">"b2"</span>, <span class="jxr_string">"2209097a-5078-4b03-801a-6a2d2f50d739"</span>);
+<a class="jxr_linenumber" name="L463" href="#L463">463</a> g2.add(b2, b2, name, factory2.createLiteral(<span class="jxr_string">"Dave"</span>));
+<a class="jxr_linenumber" name="L464" href="#L464">464</a>
+<a class="jxr_linenumber" name="L465" href="#L465">465</a> <strong class="jxr_keyword">final</strong> IRI hasChild = factory2.createIRI(<span class="jxr_string">"http://example.com/hasChild"</span>);
+<a class="jxr_linenumber" name="L466" href="#L466">466</a> <em class="jxr_comment">// NOTE: Opposite direction of loadDataset1</em>
+<a class="jxr_linenumber" name="L467" href="#L467">467</a> g2.add(b2, b2, hasChild, b1);
+<a class="jxr_linenumber" name="L468" href="#L468">468</a> <strong class="jxr_keyword">return</strong> g2;
+<a class="jxr_linenumber" name="L469" href="#L469">469</a> }
+<a class="jxr_linenumber" name="L470" href="#L470">470</a>
+<a class="jxr_linenumber" name="L471" href="#L471">471</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L472" href="#L472">472</a> <em class="jxr_javadoccomment"> * Ensure {@link Dataset#getGraphNames()} contains our two graphs.</em>
+<a class="jxr_linenumber" name="L473" href="#L473">473</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="L474" href="#L474">474</a> <em class="jxr_javadoccomment"> * @throws Exception</em>
+<a class="jxr_linenumber" name="L475" href="#L475">475</a> <em class="jxr_javadoccomment"> * If test fails</em>
+<a class="jxr_linenumber" name="L476" href="#L476">476</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L477" href="#L477">477</a> @Test
+<a class="jxr_linenumber" name="L478" href="#L478">478</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getGraphNames() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L479" href="#L479">479</a> <strong class="jxr_keyword">final</strong> Set<BlankNodeOrIRI> names = dataset.getGraphNames().collect(Collectors.toSet());
+<a class="jxr_linenumber" name="L480" href="#L480">480</a> assertTrue(<span class="jxr_string">"Can't find graph name "</span> + graph1, names.contains(graph1));
+<a class="jxr_linenumber" name="L481" href="#L481">481</a> assertTrue(<span class="jxr_string">"Found no quads in graph1"</span>, dataset.contains(Optional.of(graph1), <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L482" href="#L482">482</a>
+<a class="jxr_linenumber" name="L483" href="#L483">483</a> <strong class="jxr_keyword">final</strong> Optional<BlankNodeOrIRI> graphName2 = dataset.getGraphNames().filter(BlankNode.<strong class="jxr_keyword">class</strong>::isInstance).findAny();
+<a class="jxr_linenumber" name="L484" href="#L484">484</a> assertTrue(<span class="jxr_string">"Could not find graph2-like BlankNode"</span>, graphName2.isPresent());
+<a class="jxr_linenumber" name="L485" href="#L485">485</a> assertTrue(<span class="jxr_string">"Found no quads in graph2"</span>, dataset.contains(graphName2, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L486" href="#L486">486</a>
+<a class="jxr_linenumber" name="L487" href="#L487">487</a> <em class="jxr_comment">// Some implementations like Virtuoso might have additional internal graphs,</em>
+<a class="jxr_linenumber" name="L488" href="#L488">488</a> <em class="jxr_comment">// so we can't assume this:</em>
+<a class="jxr_linenumber" name="L489" href="#L489">489</a> <em class="jxr_comment">//assertEquals(2, names.size());</em>
+<a class="jxr_linenumber" name="L490" href="#L490">490</a> }
+<a class="jxr_linenumber" name="L491" href="#L491">491</a>
+<a class="jxr_linenumber" name="L492" href="#L492">492</a> @Test
+<a class="jxr_linenumber" name="L493" href="#L493">493</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getGraph() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L494" href="#L494">494</a> <strong class="jxr_keyword">final</strong> Graph defaultGraph = dataset.getGraph();
+<a class="jxr_linenumber" name="L495" href="#L495">495</a> <em class="jxr_comment">// TODO: Can we assume the default graph was empty before our new triples?</em>
+<a class="jxr_linenumber" name="L496" href="#L496">496</a> assertEquals(2, defaultGraph.size());
+<a class="jxr_linenumber" name="L497" href="#L497">497</a> assertTrue(defaultGraph.contains(alice, isPrimaryTopicOf, graph1));
+<a class="jxr_linenumber" name="L498" href="#L498">498</a> <em class="jxr_comment">// NOTE: graph2 is a BlankNode</em>
+<a class="jxr_linenumber" name="L499" href="#L499">499</a> assertTrue(defaultGraph.contains(bob, isPrimaryTopicOf, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L500" href="#L500">500</a> }
+<a class="jxr_linenumber" name="L501" href="#L501">501</a>
+<a class="jxr_linenumber" name="L502" href="#L502">502</a>
+<a class="jxr_linenumber" name="L503" href="#L503">503</a> @Test
+<a class="jxr_linenumber" name="L504" href="#L504">504</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getGraphNull() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L505" href="#L505">505</a> <em class="jxr_comment">// Default graph should be present</em>
+<a class="jxr_linenumber" name="L506" href="#L506">506</a> <strong class="jxr_keyword">final</strong> Graph defaultGraph = dataset.getGraph(<strong class="jxr_keyword">null</strong>).get();
+<a class="jxr_linenumber" name="L507" href="#L507">507</a> <em class="jxr_comment">// TODO: Can we assume the default graph was empty before our new triples?</em>
+<a class="jxr_linenumber" name="L508" href="#L508">508</a> assertEquals(2, defaultGraph.size());
+<a class="jxr_linenumber" name="L509" href="#L509">509</a> assertTrue(defaultGraph.contains(alice, isPrimaryTopicOf, graph1));
+<a class="jxr_linenumber" name="L510" href="#L510">510</a> <em class="jxr_comment">// NOTE: wildcard as graph2 is a (potentially mapped) BlankNode</em>
+<a class="jxr_linenumber" name="L511" href="#L511">511</a> assertTrue(defaultGraph.contains(bob, isPrimaryTopicOf, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L512" href="#L512">512</a> }
+<a class="jxr_linenumber" name="L513" href="#L513">513</a>
+<a class="jxr_linenumber" name="L514" href="#L514">514</a>
+<a class="jxr_linenumber" name="L515" href="#L515">515</a> @Test
+<a class="jxr_linenumber" name="L516" href="#L516">516</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getGraph1() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L517" href="#L517">517</a> <em class="jxr_comment">// graph1 should be present</em>
+<a class="jxr_linenumber" name="L518" href="#L518">518</a> <strong class="jxr_keyword">final</strong> Graph g1 = dataset.getGraph(graph1).get();
+<a class="jxr_linenumber" name="L519" href="#L519">519</a> assertEquals(4, g1.size());
+<a class="jxr_linenumber" name="L520" href="#L520">520</a>
+<a class="jxr_linenumber" name="L521" href="#L521">521</a> assertTrue(g1.contains(alice, name, aliceName));
+<a class="jxr_linenumber" name="L522" href="#L522">522</a> assertTrue(g1.contains(alice, knows, bob));
+<a class="jxr_linenumber" name="L523" href="#L523">523</a> assertTrue(g1.contains(alice, member, <strong class="jxr_keyword">null</strong>));
+<a class="jxr_linenumber" name="L524" href="#L524">524</a> assertTrue(g1.contains(<strong class="jxr_keyword">null</strong>, name, secretClubName));
+<a class="jxr_linenumber" name="L525" href="#L525">525</a> }
+<a class="jxr_linenumber" name="L526" href="#L526">526</a>
+<a class="jxr_linenumber" name="L527" href="#L527">527</a> @Test
+<a class="jxr_linenumber" name="L528" href="#L528">528</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> getGraph2() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L529" href="#L529">529</a> <em class="jxr_comment">// graph2 should be present, even if is named by a BlankNode</em>
+<a class="jxr_linenumber" name="L530" href="#L530">530</a> <em class="jxr_comment">// We'll look up the potentially mapped graph2 blanknode</em>
+<a class="jxr_linenumber" name="L531" href="#L531">531</a> <strong class="jxr_keyword">final</strong> BlankNodeOrIRI graph2Name = (BlankNodeOrIRI) dataset.stream(Optional.empty(), bob, isPrimaryTopicOf, <strong class="jxr_keyword">null</strong>)
+<a class="jxr_linenumber" name="L532" href="#L532">532</a> .map(Quad::getObject).findAny().get();
+<a class="jxr_linenumber" name="L533" href="#L533">533</a>
+<a class="jxr_linenumber" name="L534" href="#L534">534</a> <strong class="jxr_keyword">final</strong> Graph g2 = dataset.getGraph(graph2Name).get();
+<a class="jxr_linenumber" name="L535" href="#L535">535</a> assertEquals(4, g2.size());
+<a class="jxr_linenumber" name="L536" href="#L536">536</a> <strong class="jxr_keyword">final</strong> Triple bobNameTriple = bobNameQuad.asTriple();
+<a class="jxr_linenumber" name="L537" href="#L537">537</a> assertTrue(g2.contains(bobNameTriple));
+<a class="jxr_linenumber" name="L538" href="#L538">538</a> assertTrue(g2.contains(bob, member, bnode1));
+<a class="jxr_linenumber" name="L539" href="#L539">539</a> assertTrue(g2.contains(bob, member, bnode2));
+<a class="jxr_linenumber" name="L540" href="#L540">540</a> assertFalse(g2.contains(bnode1, name, secretClubName));
+<a class="jxr_linenumber" name="L541" href="#L541">541</a> assertTrue(g2.contains(bnode2, name, companyName));
+<a class="jxr_linenumber" name="L542" href="#L542">542</a> }
+<a class="jxr_linenumber" name="L543" href="#L543">543</a>
+<a class="jxr_linenumber" name="L544" href="#L544">544</a>
+<a class="jxr_linenumber" name="L545" href="#L545">545</a>
+<a class="jxr_linenumber" name="L546" href="#L546">546</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="L547" href="#L547">547</a> <em class="jxr_javadoccomment"> * An attempt to use the Java 8 streams to look up a more complicated query.</em>
+<a class="jxr_linenumber" name="L548" href="#L548">548</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="L549" href="#L549">549</a> <em class="jxr_javadoccomment"> * FYI, the equivalent SPARQL version (untested):</em>
+<a class="jxr_linenumber" name="L550" href="#L550">550</a> <em class="jxr_javadoccomment"> * </em>
+<a class="jxr_linenumber" name="L551" href="#L551">551</a> <em class="jxr_javadoccomment"> * <pre></em>
+<a class="jxr_linenumber" name="L552" href="#L552">552</a> <em class="jxr_javadoccomment"> * SELECT ?orgName WHERE {</em>
+<a class="jxr_linenumber" name="L553" href="#L553">553</a> <em class="jxr_javadoccomment"> * ?org foaf:name ?orgName .</em>
+<a class="jxr_linenumber" name="L554" href="#L554">554</a> <em class="jxr_javadoccomment"> * ?alice foaf:member ?org .</em>
+<a class="jxr_linenumber" name="L555" href="#L555">555</a> <em class="jxr_javadoccomment"> * ?bob foaf:member ?org .</em>
+<a class="jxr_linenumber" name="L556" href="#L556">556</a> <em class="jxr_javadoccomment"> * ?alice foaf:knows ?bob .</em>
+<a class="jxr_linenumber" name="L557" href="#L557">557</a> <em class="jxr_javadoccomment"> * FILTER NOT EXIST { ?bob foaf:knows ?alice }</em>
+<a class="jxr_linenumber" name="L558" href="#L558">558</a> <em class="jxr_javadoccomment"> * }</em>
+<a class="jxr_linenumber" name="L559" href="#L559">559</a> <em class="jxr_javadoccomment"> * </pre></em>
+<a class="jxr_linenumber" name="L560" href="#L560">560</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="L561" href="#L561">561</a> <em class="jxr_javadoccomment"> * @throws Exception If test fails</em>
+<a class="jxr_linenumber" name="L562" href="#L562">562</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="L563" href="#L563">563</a> @Test
+<a class="jxr_linenumber" name="L564" href="#L564">564</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> whyJavaStreamsMightNotTakeOverFromSparql() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="L565" href="#L565">565</a> Assume.assumeNotNull(bnode1, bnode2, secretClubName);
+<a class="jxr_linenumber" name="L566" href="#L566">566</a> <em class="jxr_comment">// Find a secret organizations</em>
+<a class="jxr_linenumber" name="L567" href="#L567">567</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> stream = dataset.stream(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, knows, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L568" href="#L568">568</a> assertEquals(<span class="jxr_string">"\"The Secret Club\""</span>,
+<a class="jxr_linenumber" name="L569" href="#L569">569</a> <em class="jxr_comment">// Find One-way "knows"</em>
+<a class="jxr_linenumber" name="L570" href="#L570">570</a> stream.filter(t -> !dataset.contains(<strong class="jxr_keyword">null</strong>, (BlankNodeOrIRI) t.getObject(), knows, t.getSubject()))
+<a class="jxr_linenumber" name="L571" href="#L571">571</a> .map(knowsQuad -> {
+<a class="jxr_linenumber" name="L572" href="#L572">572</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> memberOf = dataset
+<a class="jxr_linenumber" name="L573" href="#L573">573</a> <em class="jxr_comment">// and those they know, what are they</em>
+<a class="jxr_linenumber" name="L574" href="#L574">574</a> <em class="jxr_comment">// member of?</em>
+<a class="jxr_linenumber" name="L575" href="#L575">575</a> .stream(<strong class="jxr_keyword">null</strong>, (BlankNodeOrIRI) knowsQuad.getObject(), member, <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L576" href="#L576">576</a> <strong class="jxr_keyword">return</strong> memberOf
+<a class="jxr_linenumber" name="L577" href="#L577">577</a> <em class="jxr_comment">// keep those which first-guy is a</em>
+<a class="jxr_linenumber" name="L578" href="#L578">578</a> <em class="jxr_comment">// member of</em>
+<a class="jxr_linenumber" name="L579" href="#L579">579</a> .filter(memberQuad -> dataset.contains(<strong class="jxr_keyword">null</strong>, knowsQuad.getSubject(), member,
+<a class="jxr_linenumber" name="L580" href="#L580">580</a> <em class="jxr_comment">// First hit is good enough</em>
+<a class="jxr_linenumber" name="L581" href="#L581">581</a> memberQuad.getObject()))
+<a class="jxr_linenumber" name="L582" href="#L582">582</a> .findFirst().get().getObject();
+<a class="jxr_linenumber" name="L583" href="#L583">583</a> }
+<a class="jxr_linenumber" name="L584" href="#L584">584</a> })
+<a class="jxr_linenumber" name="L585" href="#L585">585</a> <em class="jxr_comment">// then look up the name of that org</em>
+<a class="jxr_linenumber" name="L586" href="#L586">586</a> .map(org -> {
+<a class="jxr_linenumber" name="L587" href="#L587">587</a> <strong class="jxr_keyword">try</strong> (Stream<? <strong class="jxr_keyword">extends</strong> Quad> orgName = dataset.stream(<strong class="jxr_keyword">null</strong>, (BlankNodeOrIRI) org, name,
+<a class="jxr_linenumber" name="L588" href="#L588">588</a> <strong class="jxr_keyword">null</strong>)) {
+<a class="jxr_linenumber" name="L589" href="#L589">589</a> <strong class="jxr_keyword">return</strong> orgName.findFirst().get().getObject().ntriplesString();
+<a class="jxr_linenumber" name="L590" href="#L590">590</a> }
+<a class="jxr_linenumber" name="L591" href="#L591">591</a> }).findFirst().get());
+<a class="jxr_linenumber" name="L592" href="#L592">592</a> }
+<a class="jxr_linenumber" name="L593" href="#L593">593</a> }
+<a class="jxr_linenumber" name="L594" href="#L594">594</a> }
+</pre>
+<hr/>
+<div id="footer">Copyright © 2015–2016 <a href="https://www.apache.org/">The Apache Software Foundation</a>. All rights reserved.</div>
+</body>
+</html>
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