/*
* 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.tinkerpop.gremlin.hadoop.structure.io.script;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.tinkerpop.gremlin.hadoop.structure.io.CommonFileInputFormat;
import org.apache.tinkerpop.gremlin.hadoop.structure.io.VertexWritable;
import java.io.IOException;
/**
* ScriptInputFormat and {@link org.apache.tinkerpop.gremlin.hadoop.structure.io.script.ScriptOutputFormat}
* take an arbitrary script and use that script to either read or write Vertex objects,
* respectively. This can be considered the most general InputFormat/OutputFormat
* possible in that Hadoop-Gremlin uses the user provided script for all reading/writing.
* @see <a href="http://tinkerpop.apache.org/docs/current/reference/#script-io-format">Script I/O Format Reference Documentation</a>
* @author Marko A. Rodriguez (http://markorodriguez.com)
* @author Daniel Kuppitz (http://gremlin.guru)
*/
public final class ScriptInputFormat extends CommonFileInputFormat {
@Override
public RecordReader<NullWritable, VertexWritable> createRecordReader(final InputSplit split, final TaskAttemptContext context) throws IOException, InterruptedException {
RecordReader<NullWritable, VertexWritable> reader = new ScriptRecordReader();
reader.initialize(split, context);
return reader;
}
}