1 /*
2 * Copyright 2006 Edward Kuns
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 * $Id: SafeStack.java 0000 2006-12-21 22:00:00Z ekuns $
17 */
18 package org.exolab.castor.util;
19
20 import java.util.Stack;
21
22 /**
23 * The {@link Stack#search} method of {@link Stack} can throw a
24 * ClassCastException if the items on the stack are not all the same type. We
25 * override that method so it compares on identity and not using
26 * <code>equals()</code>.
27 *
28 * @author <a href="mailto:edward.kuns@aspect.com">Edward Kuns</a>
29 * @version $Revision: 0000 $ $Date: $
30 */
31 public class SafeStack<E> extends Stack<E> {
32 /**
33 * Serial Version UID.
34 */
35 private static final long serialVersionUID = 4964881847051572321L;
36
37 /**
38 * {@inheritDoc}
39 * <br/>
40 * Searches for the given Object in the stack and returns its position
41 * relative to the top of the Stack (ie the number of calls to #pop()
42 * before the object is returned by #pop())
43 */
44 public synchronized int search(Object object) {
45 for (int i = 0; i < size(); i++) {
46 if (object == get(i)) {
47 return i + 1;
48 }
49 }
50 return -1;
51 }
52 }