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* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.xml.internal.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.
*
* <p>
* 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<K extends Comparable<K>,V> extends TreeMap<K,V> {
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<? extends K, ? extends V> map) {
throw new UnsupportedOperationException();
}
}