code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the  "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.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;
      }
  }
  