svn commit: r1604644 - /jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java

[an...@apache.org]

Author: andy
Date: Sun Jun 22 19:39:16 2014
New Revision: 1604644

URL: http://svn.apache.org/r1604644
Log:
Checking wrapper for ResultSets (JENA-727)

Added:
    jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java   (with props)

Added: jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java
URL: http://svn.apache.org/viewvc/jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java?rev=1604644&view=auto
==============================================================================
--- jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java (added)
+++ jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java Sun Jun 22 19:39:16 2014
@@ -0,0 +1,111 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hp.hpl.jena.sparql.engine;
+
+import java.util.List ;
+
+import com.hp.hpl.jena.query.QueryExecution ;
+import com.hp.hpl.jena.query.QuerySolution ;
+import com.hp.hpl.jena.query.ResultSet ;
+import com.hp.hpl.jena.rdf.model.Model ;
+import com.hp.hpl.jena.sparql.ARQException ;
+import com.hp.hpl.jena.sparql.engine.binding.Binding ;
+
+/** ResultSet wrapper that check whether some condition is true
+ * (e.g. the QueryExecution has not been closed). 
+ */
+public class ResultSetCheckCondition implements ResultSet
+{
+    interface Condition { boolean check() ; }
+    private final ResultSet other ;
+    private final Condition condition ;
+
+    public ResultSetCheckCondition(ResultSet other, QueryExecution qExec) {
+        this(other, checkQExec(qExec) ) ;
+    }
+
+    public  ResultSetCheckCondition(ResultSet other, Condition condition) {
+        this.other = other ;
+        this.condition = condition ;
+    }
+
+    // Feel free to replace with a lambda expression for Java8!
+    private static Condition checkQExec(QueryExecution qExec) {
+        return new Condition() {
+            @Override
+            public boolean check() { return true ; } // ! qExec.isClosed()  
+        } ;
+    }
+
+    @Override
+    public boolean hasNext() {
+        check() ;
+        return other.hasNext() ;
+    }
+
+    @Override
+    public QuerySolution next() {
+        check() ;
+        return other.next() ;
+    }
+
+    @Override
+    public void remove() {
+        check() ;
+        other.remove() ;
+    }
+
+    @Override
+    public QuerySolution nextSolution() {
+        check() ;
+        return other.nextSolution() ;
+    }
+
+    @Override
+    public Binding nextBinding() {
+        check() ;
+        return other.nextBinding() ;
+    }
+
+    @Override
+    public int getRowNumber() {
+        check() ;
+        return other.getRowNumber() ;
+    }
+
+    @Override
+    public List<String> getResultVars() {
+        check() ;
+        return other.getResultVars() ;
+    }
+
+    @Override
+    public Model getResourceModel() {
+        check() ;
+        return other.getResourceModel() ;
+    }
+    
+    private final void check() {
+        if ( ! condition.check()  ) {
+            throw new ARQException("ResultSet no longer valid") ;    
+        }
+    }
+
+
+}

Propchange: jena/trunk/jena-arq/src/main/java/com/hp/hpl/jena/sparql/engine/ResultSetCheckCondition.java
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