| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2000,2001 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 org.apache.xerces.util; |
| |
| /** |
| * A simple integer based stack. |
| * |
| * moved to org.apache.xerces.util by neilg to support the |
| * XPathMatcher. |
| * @author Andy Clark, IBM |
| * |
| * @version $Id$ |
| */ |
| 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]; |
| } |
| |
| /** 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 boolean ensureCapacity(int size) { |
| try { |
| return fData[size] != 0; |
| } |
| catch (NullPointerException e) { |
| fData = new int[32]; |
| } |
| catch (ArrayIndexOutOfBoundsException e) { |
| int[] newdata = new int[fData.length * 2]; |
| System.arraycopy(fData, 0, newdata, 0, fData.length); |
| fData = newdata; |
| } |
| return true; |
| } |
| |
| } // class IntStack |