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/*
 * (c) 2005 David B. Bracewell
 *
 * 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 com.davidbracewell.collection;

import lombok.EqualsAndHashCode;
import lombok.ToString;

import java.io.Serializable;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 

Mimics {@link String#intern()} with any object using heap memory.

* * @author David B. Bracewell */ @EqualsAndHashCode @ToString(includeFieldNames = false) public final class Interner implements Serializable { private static final long serialVersionUID = 1L; private volatile ConcurrentHashMap map = new ConcurrentHashMap<>(); /** * Adds or gets the cannoical version of the incoming object. * * @param object The object to itern * @return The interned value */ public OBJECT intern(final OBJECT object) { if (object == null) { return null; } map.putIfAbsent(object, object); return map.get(object); } }//END OF Interner