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Groovy: A powerful, dynamic language for the JVM

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/*
 * 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;
    }

}