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SimpleEntry.java
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SimpleEntry.java
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/*
* Copyright (c) 2008-2016, 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.aggregation.impl;
import com.hazelcast.config.MapAttributeConfig;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.query.impl.QueryableEntry;
import com.hazelcast.query.impl.getters.Extractors;
import java.util.Collections;
/**
* Internal implementation of an map entry with changeable value to prevent
* to much object allocation while supplying
*
* @param <K> key type
* @param <V> value type
*/
final class SimpleEntry<K, V>
extends QueryableEntry<K, V> {
private K key;
private V value;
public SimpleEntry() {
this.extractors = new Extractors(Collections.<MapAttributeConfig>emptyList());
}
@Override
public K getKey() {
return key;
}
@Override
public Data getKeyData() {
// not used in map-reduce
throw new UnsupportedOperationException();
}
@Override
public Data getValueData() {
// not used in map-reduce
throw new UnsupportedOperationException();
}
@Override
protected Object getTargetObject(boolean key) {
return key ? this.key : this.value;
}
@Override
public V getValue() {
return value;
}
@Override
public V setValue(V newValue) {
V oldValue = this.value;
this.value = newValue;
return oldValue;
}
void setKey(K key) {
this.key = key;
}
}