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1 /*** 2 * Redistribution and use of this software and associated documentation 3 * ("Software"), with or without modification, are permitted provided 4 * that the following conditions are met: 5 * 6 * 1. Redistributions of source code must retain copyright 7 * statements and notices. Redistributions must also contain a 8 * copy of this document. 9 * 10 * 2. Redistributions in binary form must reproduce the 11 * above copyright notice, this list of conditions and the 12 * following disclaimer in the documentation and/or other 13 * materials provided with the distribution. 14 * 15 * 3. The name "Exolab" must not be used to endorse or promote 16 * products derived from this Software without prior written 17 * permission of Exoffice Technologies. For written permission, 18 * please contact info@exolab.org. 19 * 20 * 4. Products derived from this Software may not be called "Exolab" 21 * nor may "Exolab" appear in their names without prior written 22 * permission of Exoffice Technologies. Exolab is a registered 23 * trademark of Exoffice Technologies. 24 * 25 * 5. Due credit should be given to the Exolab Project 26 * (http://www.exolab.org/). 27 * 28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 39 * OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Copyright 2000-2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved. 42 */ 43 44 package org.exolab.jms.selector; 45 46 import org.apache.oro.text.regex.MalformedPatternException; 47 import org.apache.oro.text.regex.Pattern; 48 import org.apache.oro.text.regex.Perl5Compiler; 49 50 51 /*** 52 * Regular expression factory. This creates a regular expression for a given 53 * SQL92 pattern and escape character. 54 * 55 * @version $Revision: 1.5 $ $Date: 2003/08/09 15:49:50 $ 56 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a> 57 */ 58 final class RegexpFactory { 59 60 /*** 61 * Private constructor 62 */ 63 private RegexpFactory() { 64 } 65 66 /*** 67 * Converts the pattern and escape to an ORO <code>Pattern</code> 68 * 69 * @param pattern the pattern 70 * @param escape the escape character. May be null 71 * @return an ORO <code>Pattern</code> corresponding to 72 * <code>pattern</code> and <code>escape</code> 73 * @throws InvalidRegexpException if <code>pattern</code> or 74 * <code>escape</code> are invalid 75 */ 76 public static Pattern create(final String pattern, final Character escape) 77 throws InvalidRegexpException { 78 StringBuffer buff = new StringBuffer(); 79 buff.append('^'); 80 81 for (int i = 0; i < pattern.length(); ++i) { 82 boolean escaped = false; 83 char ch = pattern.charAt(i); 84 if (escape != null && ch == escape.charValue()) { 85 if (++i < pattern.length()) { 86 ch = pattern.charAt(i); 87 escaped = true; 88 } else { 89 throw new InvalidRegexpException(pattern); 90 } 91 } 92 93 switch (ch) { 94 case '_': 95 if (escaped) { 96 buff.append(ch); 97 } else { 98 buff.append('.'); 99 } 100 break; 101 case '%': 102 if (escaped) { 103 buff.append(ch); 104 } else { 105 buff.append(".*"); 106 } 107 break; 108 case '.': 109 case '[': 110 case ']': 111 case '//': 112 case '+': 113 case '?': 114 case '{': 115 case '}': 116 case '$': 117 case '^': 118 case '|': 119 case '(': 120 case ')': 121 // the above are all special characters that need to be 122 // escaped. 123 buff.append('//'); 124 buff.append(ch); 125 break; 126 default: 127 buff.append(ch); 128 } 129 } 130 buff.append('$'); 131 132 Pattern result = null; 133 try { 134 Perl5Compiler compiler = new Perl5Compiler(); 135 result = compiler.compile(buff.toString()); 136 } catch (MalformedPatternException exception) { 137 // coding error if this gets thrown here... 138 throw new InvalidRegexpException(pattern); 139 } 140 return result; 141 } 142 143 } //-- RegexpFactory

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