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From tjungb...@apache.org
Subject svn commit: r1341942 - /incubator/hama/trunk/graph/src/main/java/org/apache/hama/graph/SumAggregator.java
Date Wed, 23 May 2012 16:30:32 GMT
Author: tjungblut
Date: Wed May 23 16:30:31 2012
New Revision: 1341942

URL: http://svn.apache.org/viewvc?rev=1341942&view=rev
Log:
SumAggregator

Added:
    incubator/hama/trunk/graph/src/main/java/org/apache/hama/graph/SumAggregator.java

Added: incubator/hama/trunk/graph/src/main/java/org/apache/hama/graph/SumAggregator.java
URL: http://svn.apache.org/viewvc/incubator/hama/trunk/graph/src/main/java/org/apache/hama/graph/SumAggregator.java?rev=1341942&view=auto
==============================================================================
--- incubator/hama/trunk/graph/src/main/java/org/apache/hama/graph/SumAggregator.java (added)
+++ incubator/hama/trunk/graph/src/main/java/org/apache/hama/graph/SumAggregator.java Wed
May 23 16:30:31 2012
@@ -0,0 +1,41 @@
+/**
+ * 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.hama.graph;
+
+import org.apache.hadoop.io.DoubleWritable;
+
+/**
+ * Sums all vertex values globally.
+ */
+public class SumAggregator extends
+    AbstractAggregator<DoubleWritable, Vertex<?, DoubleWritable, ?>> {
+
+  double sum = 0.0d;
+
+  @Override
+  public void aggregate(Vertex<?, DoubleWritable, ?> vertex,
+      DoubleWritable value) {
+    sum += value.get();
+  }
+
+  @Override
+  public DoubleWritable getValue() {
+    return new DoubleWritable(sum);
+  }
+
+}



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