1 /*
2 * Copyright 2006 Edward Kuns
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 *
14 * $Id: SafeStack.java 0000 2006-12-21 22:00:00Z ekuns $
15 */
16 package org.exolab.castor.util;
17
18 import java.util.Stack;
19
20 /**
21 * The {@link Stack#search} method of {@link Stack} can throw a ClassCastException if the items on
22 * the stack are not all the same type. We override that method so it compares on identity and not
23 * using <code>equals()</code>.
24 *
25 * @author <a href="mailto:edward.kuns@aspect.com">Edward Kuns</a>
26 * @version $Revision: 0000 $ $Date: $
27 */
28 public class SafeStack<E> extends Stack<E> {
29 /**
30 * Serial Version UID.
31 */
32 private static final long serialVersionUID = 4964881847051572321L;
33
34 /**
35 * {@inheritDoc} <br/>
36 * Searches for the given Object in the stack and returns its position relative to the top of the
37 * Stack (ie the number of calls to #pop() before the object is returned by #pop())
38 */
39 public synchronized int search(Object object) {
40 for (int i = 0; i < size(); i++) {
41 if (object == get(i)) {
42 return i + 1;
43 }
44 }
45 return -1;
46 }
47 }