01: /*
02:
03: Licensed to the Apache Software Foundation (ASF) under one or more
04: contributor license agreements. See the NOTICE file distributed with
05: this work for additional information regarding copyright ownership.
06: The ASF licenses this file to You under the Apache License, Version 2.0
07: (the "License"); you may not use this file except in compliance with
08: the License. You may obtain a copy of the License at
09:
10: http://www.apache.org/licenses/LICENSE-2.0
11:
12: Unless required by applicable law or agreed to in writing, software
13: distributed under the License is distributed on an "AS IS" BASIS,
14: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15: See the License for the specific language governing permissions and
16: limitations under the License.
17:
18: */
19: package org.apache.batik.util;
20:
21: import org.apache.batik.dom.util.DoublyIndexedTable;
22:
23: /**
24: * A set that uses two keys.
25: *
26: * @author <a href="mailto:cam%40mcc%2eid%2eau">Cameron McCormack</a>
27: * @version $Id: DoublyIndexedSet.java 475477 2006-11-15 22:44:28Z cam $
28: */
29: public class DoublyIndexedSet {
30:
31: /**
32: * The table to store entries.
33: */
34: protected DoublyIndexedTable table = new DoublyIndexedTable();
35:
36: /**
37: * Dummy value object for the table.
38: */
39: protected static Object value = new Object();
40:
41: /**
42: * Returns the number of entries in the set.
43: */
44: public int size() {
45: return table.size();
46: }
47:
48: /**
49: * Adds an entry to the set.
50: */
51: public void add(Object o1, Object o2) {
52: table.put(o1, o2, value);
53: }
54:
55: /**
56: * Removes an entry from the set.
57: */
58: public void remove(Object o1, Object o2) {
59: table.remove(o1, o2);
60: }
61:
62: /**
63: * Returns whether the given keys are in the set.
64: */
65: public boolean contains(Object o1, Object o2) {
66: return table.get(o1, o2) != null;
67: }
68:
69: /**
70: * Clears the set.
71: */
72: public void clear() {
73: table.clear();
74: }
75: }
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