01: /**
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */package org.apache.openejb.util;
17:
18: import java.util.ArrayList;
19: import java.util.EmptyStackException;
20:
21: public final class ArrayStack extends ArrayList implements Stack {
22:
23: public void setSize(int newSize) {
24: if (newSize == 0)
25: clear();
26: else {
27: for (int i = size() - 1; i >= newSize; i--)
28: remove(i);
29: }
30: }
31:
32: public Object push(Object item) {
33: add(item);
34: return item;
35: }
36:
37: public Object pop() {
38: Object obj;
39: obj = peek();
40:
41: int len = size();
42: remove(len - 1);
43:
44: return obj;
45: }
46:
47: public Object peek() {
48: int len = size();
49:
50: if (len == 0)
51: throw new EmptyStackException();
52:
53: return get(len - 1);
54: }
55: }
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