2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package org.opendaylight.yangtools.xsd.regex;
19 import java.util.Arrays;
20 import java.util.EmptyStackException;
21 import javax.annotation.concurrent.NotThreadSafe;
24 * A specialized minimal implementation of Stack<Integer>, which operations on simple ints.
27 final class IntStack {
28 private static final int DEFAULT_SIZE = 10;
29 private static final int INCREMENT = 10;
31 private int count = 0;
37 IntStack(final int size) {
38 items = new int[size];
41 void push(final int item) {
42 if (count == items.length) {
43 items = Arrays.copyOf(items, items.length + INCREMENT);
46 items[count++] = item;
51 throw new EmptyStackException();
54 return items[--count];