/*
* 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.giraph.io.gora;
import java.io.IOException;
import org.apache.giraph.edge.Edge;
import org.apache.giraph.edge.EdgeFactory;
import org.apache.giraph.io.gora.generated.GEdge;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
/**
* Implementation of a specific reader for a generated data bean.
*/
public class GoraTestEdgeInputFormat
extends GoraEdgeInputFormat<LongWritable, FloatWritable> {
/**
* Default constructor
*/
public GoraTestEdgeInputFormat() {
}
/**
* Creates specific vertex reader to be used inside Hadoop.
* @param split split to be read.
* @param context JobContext to be used.
* @return GoraEdgeReader Edge reader to be used by Hadoop.
*/
@Override
public GoraEdgeReader createEdgeReader(
InputSplit split, TaskAttemptContext context) throws IOException {
putArtificialData();
return new GoraGEdgeEdgeReader();
}
/**
* Writes data into the data store in order to test it out.
*/
@SuppressWarnings("unchecked")
private static void putArtificialData() {
getDataStore().put("11-22",
createEdge("11-22", "11", "22", "11-22", (float)(11+22)));
getDataStore().put("22-11",
createEdge("22-11", "22", "11", "22-11", (float)(22+11)));
getDataStore().put("11-33",
createEdge("11-33", "11", "33", "11-33", (float)(11+33)));
getDataStore().put("33-11",
createEdge("33-11", "33", "11", "33-11", (float)(33+11)));
getDataStore().flush();
}
/**
* Creates an edge using an id and a set of edges.
* @param id Vertex id.
* @param vertexInId Vertex source Id.
* @param vertexOutId Vertex destination Id.
* @param edgeLabel Edge label.
* @param edgeWeight Edge wight.
* @return GEdge created.
*/
private static GEdge createEdge(String id, String vertexInId,
String vertexOutId, String edgeLabel, float edgeWeight) {
GEdge newEdge = new GEdge();
newEdge.setEdgeId(id);
newEdge.setVertexInId(vertexInId);
newEdge.setVertexOutId(vertexOutId);
newEdge.setLabel(edgeLabel);
newEdge.setEdgeWeight(edgeWeight);
return newEdge;
}
/**
* Gora edge reader
*/
protected class GoraGEdgeEdgeReader extends GoraEdgeReader {
/** source vertex of the edge */
private LongWritable sourceId;
/**
* Transforms a GoraObject into an Edge object.
* @param goraObject Object from Gora to be translated.
* @return Edge Result from transforming the gora object.
*/
@Override
protected Edge<LongWritable, FloatWritable> transformEdge
(Object goraObject) {
Edge<LongWritable, FloatWritable> edge = null;
GEdge goraEdge = (GEdge) goraObject;
Long dest;
Float value;
dest = Long.valueOf(goraEdge.getVertexOutId().toString());
this.sourceId = new LongWritable();
this.sourceId.set(Long.valueOf(goraEdge.getVertexInId().toString()));
value = (float) goraEdge.getEdgeWeight();
edge = EdgeFactory.create(new LongWritable(dest),
new FloatWritable(value));
return edge;
}
/**
* Gets the currentSourceId for the edge.
* @return LongWritable currentSourceId for the edge.
*/
@Override
public LongWritable getCurrentSourceId() throws IOException,
InterruptedException {
return this.sourceId;
}
}
}