/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed 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 eu.stratosphere.test.recordJobs.graph.pageRankUtil;
import eu.stratosphere.api.java.record.io.TextInputFormat;
import eu.stratosphere.types.LongValue;
import eu.stratosphere.types.Record;
public class ImprovedAdjacencyListInputFormat extends TextInputFormat {
private static final long serialVersionUID = 1L;
private final LongValue vertexID = new LongValue();
private final AsciiLongArrayView arrayView = new AsciiLongArrayView();
private final LongArrayView adjacentVertices = new LongArrayView();
@Override
public Record readRecord(Record target, byte[] bytes, int offset, int numBytes) {
if (numBytes == 0) {
return null;
}
arrayView.set(bytes, offset, numBytes);
int numElements = arrayView.numElements();
adjacentVertices.allocate(numElements - 1);
try {
int pos = 0;
while (arrayView.next()) {
if (pos == 0) {
vertexID.setValue(arrayView.element());
} else {
adjacentVertices.setQuick(pos - 1, arrayView.element());
}
pos++;
}
// sanity check
if (pos != numElements) {
throw new IllegalStateException("Should have gotten " + numElements + " elements, but saw " + pos);
}
} catch (RuntimeException e) {
throw new RuntimeException("Error parsing: " + arrayView.toString(), e);
}
target.clear();
target.addField(vertexID);
target.addField(adjacentVertices);
return target;
}
}