aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.xml.internal.bind.v2.schemagen;
aoqi@0: 
aoqi@0: import java.util.TreeMap;
aoqi@0: import java.util.Map;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * A special {@link Map} that 'conceptually' stores a set of values for each key.
aoqi@0:  *
aoqi@0:  * <p>
aoqi@0:  * When multiple values are stored, however, this class doesn't let the caller
aoqi@0:  * see individual values, and instead it returns a specially designated "MANY" value,
aoqi@0:  * which is given as a parameter to the constructor.
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi
aoqi@0:  */
aoqi@0: final class MultiMap<K extends Comparable<K>,V> extends TreeMap<K,V> {
aoqi@0:     private final V many;
aoqi@0: 
aoqi@0:     public MultiMap(V many) {
aoqi@0:         this.many = many;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public V put(K key, V value) {
aoqi@0:         V old = super.put(key, value);
aoqi@0:         if(old!=null && !old.equals(value)) {
aoqi@0:             // different value stored
aoqi@0:             super.put(key,many);
aoqi@0:         }
aoqi@0:         return old;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public void putAll(Map<? extends K, ? extends V> map) {
aoqi@0:         throw new UnsupportedOperationException();
aoqi@0:     }
aoqi@0: }