com.hazelcast.mapreduce.impl.task.KeyValueSourceMappingPhase Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.mapreduce.impl.task;
import com.hazelcast.mapreduce.Context;
import com.hazelcast.mapreduce.KeyPredicate;
import com.hazelcast.mapreduce.KeyValueSource;
import com.hazelcast.mapreduce.Mapper;
import java.util.Collection;
import java.util.Map;
/**
* This class executes the mapping phase for a given {@link com.hazelcast.mapreduce.KeyValueSource} scope.
*
* @param type of the input key
* @param type of the input value
* @param type of the emitted key
* @param type of the emitted value
*/
public class KeyValueSourceMappingPhase
extends MappingPhase {
public KeyValueSourceMappingPhase(Collection keys, KeyPredicate predicate) {
super(keys, predicate);
}
@Override
public void executeMappingPhase(KeyValueSource keyValueSource,
Mapper mapper, Context context) {
while (keyValueSource.hasNext()) {
if (matches(keyValueSource.key())) {
Map.Entry entry = keyValueSource.element();
mapper.map(entry.getKey(), entry.getValue(), context);
}
if (isCancelled()) {
return;
}
}
}
}