/**
* 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.hadoop.mapred.join;
import java.io.IOException;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableComparator;
import org.apache.hadoop.mapred.JobConf;
/**
* Full inner join.
*/
public class InnerJoinRecordReader<K extends WritableComparable>
extends JoinRecordReader<K> {
InnerJoinRecordReader(int id, JobConf conf, int capacity,
Class<? extends WritableComparator> cmpcl) throws IOException {
super(id, conf, capacity, cmpcl);
}
/**
* Return true iff the tuple is full (all data sources contain this key).
*/
protected boolean combine(Object[] srcs, TupleWritable dst) {
assert srcs.length == dst.size();
for (int i = 0; i < srcs.length; ++i) {
if (!dst.has(i)) {
return false;
}
}
return true;
}
}