1 /* 2 * $Id: CharStringPointer.java,v 1.7 2003/11/07 20:16:25 dfs Exp $ 3 * 4 * ==================================================================== 5 * The Apache Software License, Version 1.1 6 * 7 * Copyright (c) 2000 The Apache Software Foundation. All rights 8 * reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in 19 * the documentation and/or other materials provided with the 20 * distribution. 21 * 22 * 3. The end-user documentation included with the redistribution, 23 * if any, must include the following acknowledgment: 24 * "This product includes software developed by the 25 * Apache Software Foundation (http://www.apache.org/)." 26 * Alternately, this acknowledgment may appear in the software itself, 27 * if and wherever such third-party acknowledgments normally appear. 28 * 29 * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro" 30 * must not be used to endorse or promote products derived from this 31 * software without prior written permission. For written 32 * permission, please contact apache@apache.org. 33 * 34 * 5. Products derived from this software may not be called "Apache" 35 * or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their 36 * name, without prior written permission of the Apache Software Foundation. 37 * 38 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 39 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 40 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 41 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 44 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 45 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 46 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 47 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 48 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 49 * SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This software consists of voluntary contributions made by many 53 * individuals on behalf of the Apache Software Foundation. For more 54 * information on the Apache Software Foundation, please see 55 * <http://www.apache.org/>. 56 */ 57 58 59 package org.apache.oro.text.regex; 60 61 62 /** 63 * The CharStringPointer class is used to facilitate traversal of a char[] 64 * in the manner pointer traversals of strings are performed in C/C++. 65 * It is expected that the compiler will inline all the functions. 66 * 67 * @since 1.0 68 * @version @version@ 69 */ 70 final class CharStringPointer { 71 static final char _END_OF_STRING = Character.MAX_VALUE; 72 int _offset; 73 char[] _array; 74 CharStringPointer(char[] charArray, int offset)75 CharStringPointer(char[] charArray, int offset) { 76 _array = charArray; 77 _offset = offset; 78 } 79 CharStringPointer(char[] charArray)80 CharStringPointer(char[] charArray) { 81 this(charArray, 0); 82 } 83 _getValue()84 char _getValue() { 85 return _getValue(_offset); 86 } 87 _getValue(int offset)88 char _getValue(int offset) { 89 if(offset < _array.length && offset >= 0) 90 return _array[offset]; 91 return _END_OF_STRING; 92 } 93 _getValueRelative(int offset)94 char _getValueRelative(int offset) { 95 return _getValue(_offset + offset); 96 } 97 _getLength()98 int _getLength() { return _array.length; } 99 _getOffset()100 int _getOffset() { return _offset; } 101 _setOffset(int offset)102 void _setOffset(int offset) { _offset = offset; } 103 _isAtEnd()104 boolean _isAtEnd() { 105 return (_offset >= _array.length); 106 } 107 _increment(int inc)108 char _increment(int inc) { 109 _offset+=inc; 110 if(_isAtEnd()) { 111 _offset = _array.length; 112 return _END_OF_STRING; 113 } 114 115 return _array[_offset]; 116 } 117 _increment()118 char _increment() { return _increment(1); } 119 _decrement(int inc)120 char _decrement(int inc) { 121 _offset-=inc; 122 if(_offset < 0) 123 _offset = 0; 124 125 return _array[_offset]; 126 } 127 _decrement()128 char _decrement() { return _decrement(1); } 129 _postIncrement()130 char _postIncrement() { 131 char ret; 132 ret = _getValue(); 133 _increment(); 134 return ret; 135 } 136 _postDecrement()137 char _postDecrement() { 138 char ret; 139 ret = _getValue(); 140 _decrement(); 141 return ret; 142 } 143 144 _toString(int offset)145 String _toString(int offset) { 146 return new String(_array, offset, _array.length - offset); 147 } 148 toString()149 public String toString() { 150 return _toString(0); 151 } 152 } 153