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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 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.
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 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 * this work for additional information regarding copyright ownership.
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 * (the "License"); you may not use this file except in compliance with
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 *
 *      http://www.apache.org/licenses/LICENSE-2.0
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/*
 * $Id: MultiHashtable.java,v 1.10 2010-11-01 04:34:19 joehw Exp $
 */
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;

import java.util.Hashtable;
import java.util.Vector;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public final class MultiHashtable extends Hashtable {
    static final long serialVersionUID = -6151608290510033572L;
    public Object put(Object key, Object value) {
	Vector vector = (Vector)get(key);
	if (vector == null)
	    super.put(key, vector = new Vector());
	vector.add(value);
	return vector;
    }
	
    public Object maps(Object from, Object to) {
	if (from == null) return null;
	final Vector vector = (Vector) get(from);
	if (vector != null) {
	    final int n = vector.size();
	    for (int i = 0; i < n; i++) {
                final Object item = vector.elementAt(i);
		if (item.equals(to)) {
		    return item;
		}
	    }
	}
	return null;
    }
}