- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 2000-2002 The Apache Software Foundation.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.apache.org. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- package com.sun.org.apache.xerces.internal.util;
-
- /**
- * A simple integer based stack.
- *
- * moved to com.sun.org.apache.xerces.internal.util by neilg to support the
- * XPathMatcher.
- * @author Andy Clark, IBM
- *
- * @version $Id: IntStack.java,v 1.4 2003/10/17 18:14:30 mrglavas Exp $
- */
- public final class IntStack {
-
- //
- // Data
- //
-
- /** Stack depth. */
- private int fDepth;
-
- /** Stack data. */
- private int[] fData;
-
- //
- // Public methods
- //
-
- /** Returns the size of the stack. */
- public int size() {
- return fDepth;
- }
-
- /** Pushes a value onto the stack. */
- public void push(int value) {
- ensureCapacity(fDepth + 1);
- fData[fDepth++] = value;
- }
-
- /** Peeks at the top of the stack. */
- public int peek() {
- return fData[fDepth - 1];
- }
-
- /** Returns the element at the specified depth in the stack. */
- public int elementAt(int depth) {
- return fData[depth];
- }
-
- /** Pops a value off of the stack. */
- public int pop() {
- return fData[--fDepth];
- }
-
- /** Clears the stack. */
- public void clear() {
- fDepth = 0;
- }
-
- // debugging
-
- /** Prints the stack. */
- public void print() {
- System.out.print('(');
- System.out.print(fDepth);
- System.out.print(") {");
- for (int i = 0; i < fDepth; i++) {
- if (i == 3) {
- System.out.print(" ...");
- break;
- }
- System.out.print(' ');
- System.out.print(fData[i]);
- if (i < fDepth - 1) {
- System.out.print(',');
- }
- }
- System.out.print(" }");
- System.out.println();
- }
-
- //
- // Private methods
- //
-
- /** Ensures capacity. */
- private void ensureCapacity(int size) {
- if (fData == null) {
- fData = new int[32];
- }
- else if (fData.length <= size) {
- int[] newdata = new int[fData.length * 2];
- System.arraycopy(fData, 0, newdata, 0, fData.length);
- fData = newdata;
- }
- }
-
- } // class IntStack