001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: MultiHashtable.java 468649 2006-10-28 07:00:55Z minchau $
020     */
021    
022    package org.apache.xalan.xsltc.compiler.util;
023    
024    import java.util.Hashtable;
025    import java.util.Vector;
026    
027    /**
028     * @author Jacek Ambroziak
029     * @author Santiago Pericas-Geertsen
030     */
031    public final class MultiHashtable extends Hashtable {
032        static final long serialVersionUID = -6151608290510033572L;
033        public Object put(Object key, Object value) {
034            Vector vector = (Vector)get(key);
035            if (vector == null)
036                super.put(key, vector = new Vector());
037            vector.add(value);
038            return vector;
039        }
040            
041        public Object maps(Object from, Object to) {
042            if (from == null) return null;
043            final Vector vector = (Vector) get(from);
044            if (vector != null) {
045                final int n = vector.size();
046                for (int i = 0; i < n; i++) {
047                    final Object item = vector.elementAt(i);
048                    if (item.equals(to)) {
049                        return item;
050                    }
051                }
052            }
053            return null;
054        }
055    }