[54/59] [abbrv] jena git commit: Add QuadGraphCountMapper for calculating graph sizes

[rv...@apache.org]

Add QuadGraphCountMapper for calculating graph sizes


Project: http://git-wip-us.apache.org/repos/asf/jena/repo
Commit: http://git-wip-us.apache.org/repos/asf/jena/commit/963f9ce8
Tree: http://git-wip-us.apache.org/repos/asf/jena/tree/963f9ce8
Diff: http://git-wip-us.apache.org/repos/asf/jena/diff/963f9ce8

Branch: refs/heads/master
Commit: 963f9ce892fb047ba4306cab6d8468d7994f6146
Parents: 7ca24c0
Author: Rob Vesse <rv...@apache.org>
Authored: Tue Jan 6 15:26:04 2015 +0000
Committer: Rob Vesse <rv...@apache.org>
Committed: Tue Jan 6 15:26:04 2015 +0000

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 .../count/positional/QuadGraphCountMapper.java  | 42 ++++++++++++++++++++
 1 file changed, 42 insertions(+)
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http://git-wip-us.apache.org/repos/asf/jena/blob/963f9ce8/jena-elephas/jena-elephas-mapreduce/src/main/java/org/apache/jena/hadoop/rdf/mapreduce/count/positional/QuadGraphCountMapper.java
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diff --git a/jena-elephas/jena-elephas-mapreduce/src/main/java/org/apache/jena/hadoop/rdf/mapreduce/count/positional/QuadGraphCountMapper.java b/jena-elephas/jena-elephas-mapreduce/src/main/java/org/apache/jena/hadoop/rdf/mapreduce/count/positional/QuadGraphCountMapper.java
new file mode 100644
index 0000000..4afda44
--- /dev/null
+++ b/jena-elephas/jena-elephas-mapreduce/src/main/java/org/apache/jena/hadoop/rdf/mapreduce/count/positional/QuadGraphCountMapper.java
@@ -0,0 +1,42 @@
+/*
+ * 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 org.apache.jena.hadoop.rdf.mapreduce.count.positional;
+
+import org.apache.jena.hadoop.rdf.mapreduce.count.NodeCountReducer;
+import org.apache.jena.hadoop.rdf.mapreduce.count.QuadNodeCountMapper;
+import org.apache.jena.hadoop.rdf.types.NodeWritable;
+import org.apache.jena.hadoop.rdf.types.QuadWritable;
+
+/**
+ * A mapper for counting graph node usages within quads designed primarily for
+ * use in conjunction with {@link NodeCountReducer}. This can be used to
+ * calculate the size of graphs.
+ * 
+ * 
+ * 
+ * @param <TKey>
+ *            Key type
+ */
+public class QuadGraphCountMapper<TKey> extends QuadNodeCountMapper<TKey> {
+
+    @Override
+    protected NodeWritable[] getNodes(QuadWritable tuple) {
+        return new NodeWritable[] { new NodeWritable(tuple.get().getGraph()) };
+    }
+}