/*
* 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.pig;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.pig.classification.InterfaceAudience;
import org.apache.pig.classification.InterfaceStability;
/**
* This class provides an implementation of OrderedLoadFunc interface
* which can be optionally re-used by LoadFuncs that use FileInputFormat, by
* having this as a super class
* @since Pig 0.7
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving // Since we haven't done outer join for merge join yet
public abstract class FileInputLoadFunc extends LoadFunc implements OrderedLoadFunc {
@Override
public WritableComparable<?> getSplitComparable(InputSplit split)
throws IOException{
FileSplit fileSplit = null;
if(split instanceof FileSplit){
fileSplit = (FileSplit)split;
}else{
throw new RuntimeException("LoadFunc expected split of type FileSplit");
}
return new FileSplitComparable(
fileSplit.getPath().toString(),
fileSplit.getStart()
);
}
}