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Java > Open Source Codes > org > apache > xalan > xsltc > compiler > util > MultiHashtable


1 /*
2  * Copyright 2001-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: MultiHashtable.java,v 1.6 2004/02/16 22:26:44 minchau Exp $
18  */
19
20 package org.apache.xalan.xsltc.compiler.util;
21
22 import java.util.Hashtable JavaDoc;
23 import java.util.Vector JavaDoc;
24
25 /**
26  * @author Jacek Ambroziak
27  * @author Santiago Pericas-Geertsen
28  */
29 public final class MultiHashtable extends Hashtable JavaDoc {
30     public Object JavaDoc put(Object JavaDoc key, Object JavaDoc value) {
31     Vector JavaDoc vector = (Vector JavaDoc)get(key);
32     if (vector == null)
33         super.put(key, vector = new Vector JavaDoc());
34     vector.add(value);
35     return vector;
36     }
37     
38     public Object JavaDoc maps(Object JavaDoc from, Object JavaDoc to) {
39     if (from == null) return null;
40     final Vector JavaDoc vector = (Vector JavaDoc) get(from);
41     if (vector != null) {
42         final int n = vector.size();
43         for (int i = 0; i < n; i++) {
44                 final Object JavaDoc item = vector.elementAt(i);
45         if (item.equals(to)) {
46             return item;
47         }
48         }
49     }
50     return null;
51     }
52 }
53
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