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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2014 the original author or authors.
*
* 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.
*
* Derived from Boon all rights granted to Groovy project for this fork.
*/
package groovy.json.internal;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import static groovy.json.internal.Exceptions.die;
/**
* This holds a mapping from value key to value value to maximize laziness.
*
* @author Rick Hightower
*/
public class MapItemValue implements Map.Entry {
final Value name;
final Value value;
private String key = null;
private static final boolean internKeys = Boolean.parseBoolean(System.getProperty("groovy.json.implementation.internKeys", "false"));
protected static ConcurrentHashMap internedKeysCache;
static {
if (internKeys) {
internedKeysCache = new ConcurrentHashMap();
}
}
public MapItemValue(Value name, Value value) {
this.name = name;
this.value = value;
}
public String getKey() {
if (key == null) {
if (internKeys) {
key = name.toString();
String keyPrime = internedKeysCache.get(key);
if (keyPrime == null) {
key = key.intern();
internedKeysCache.put(key, key);
} else {
key = keyPrime;
}
} else {
key = name.toString();
}
}
return key;
}
public Value getValue() {
return value;
}
public Value setValue(Value value) {
die("not that kind of Entry");
return null;
}
}