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Java > Open Source Codes > org > tigris > scarab > util > RegexProcessor


1 package org.tigris.scarab.util;
2
3 /* ================================================================
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18  * any, must include the following acknowlegement: "This product includes
19  * software developed by Collab.Net <http://www.Collab.Net/>."
20  * Alternately, this acknowlegement may appear in the software itself, if
21  * and wherever such third-party acknowlegements normally appear.
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28  * "Scarab" names nor may "Tigris" or "Scarab" appear in their names without
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31  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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47  */
48
49 import org.apache.oro.text.regex.MalformedPatternException;
50 import org.apache.oro.text.regex.Pattern;
51 import org.apache.oro.text.regex.PatternCompiler;
52 import org.apache.oro.text.regex.Perl5Compiler;
53 import org.apache.oro.text.regex.Perl5Matcher;
54 import org.apache.oro.text.regex.Perl5Substitution;
55 import org.apache.oro.text.regex.Substitution;
56 import org.apache.oro.text.regex.Util;
57 import org.apache.oro.util.Cache;
58 import org.apache.oro.util.CacheLRU;
59
60 /**
61  * This is a utility class for processing regular expressions
62  * based on oro.
63  *
64  * @author <a HREF="mailto:dabboussaxess.com">Hussayn Dabbous</a>
65  * @version $Id: ReferenceInsertionFilter.java 7365 2003-03-15 21:56:59Z jon $
66  */
67 public class RegexProcessor extends Object JavaDoc
68 {
69
70     protected static Cache patterns = new CacheLRU();
71     protected static Cache substitutions = new CacheLRU();
72
73     private PatternCompiler compiler;
74
75     public RegexProcessor()
76     {
77         compiler = new Perl5Compiler();
78     }
79
80     public String JavaDoc process(String JavaDoc input, String JavaDoc regex, String JavaDoc substitution) throws MalformedPatternException
81     {
82         String JavaDoc result = input;
83         Pattern pattern = (Pattern) patterns.getElement(regex);
84         if (pattern == null)
85         {
86             pattern = compiler.compile(regex);
87             patterns.addElement(regex, pattern);
88         }
89
90         Substitution subst = (Substitution) substitutions.getElement(substitution);
91         if (subst == null)
92         {
93             subst = new Perl5Substitution(substitution);
94             substitutions.addElement(substitution, subst);
95         }
96
97         Perl5Matcher matcher = new Perl5Matcher();
98
99         result = Util.substitute(matcher, pattern, subst, input, Util.SUBSTITUTE_ALL);
100
101         return result;
102     }
103
104 }
105
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