impl.com.sun.xml.bind.v2.schemagen.MultiMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of ehcache Show documentation

Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

There is a newer version: 2.10.9.2

Show newest version

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.bind.v2.schemagen;

import java.util.TreeMap;
import java.util.Map;

/**
 * A special {@link Map} that 'conceptually' stores a set of values for each key.
 *
 * 
 * When multiple values are stored, however, this class doesn't let the caller
 * see individual values, and instead it returns a specially designated "MANY" value,
 * which is given as a parameter to the constructor.
 *
 * @author Kohsuke Kawaguchi
 */
final class MultiMap,V> extends TreeMap {
    private final V many;

    public MultiMap(V many) {
        this.many = many;
    }

    @Override
    public V put(K key, V value) {
        V old = super.put(key, value);
        if(old!=null && !old.equals(value)) {
            // different value stored
            super.put(key,many);
        }
        return old;
    }

    @Override
    public void putAll(Map map) {
        throw new UnsupportedOperationException();
    }
}