001: package org.tigris.scarab.util;
002:
003: /* ================================================================
004: * Copyright (c) 2000-2002 CollabNet. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions are
008: * met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in the
015: * documentation and/or other materials provided with the distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowlegement: "This product includes
019: * software developed by Collab.Net <http://www.Collab.Net/>."
020: * Alternately, this acknowlegement may appear in the software itself, if
021: * and wherever such third-party acknowlegements normally appear.
022: *
023: * 4. The hosted project names must not be used to endorse or promote
024: * products derived from this software without prior written
025: * permission. For written permission, please contact info@collab.net.
026: *
027: * 5. Products derived from this software may not use the "Tigris" or
028: * "Scarab" names nor may "Tigris" or "Scarab" appear in their names without
029: * prior written permission of Collab.Net.
030: *
031: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
032: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
033: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
034: * IN NO EVENT SHALL COLLAB.NET OR ITS CONTRIBUTORS BE LIABLE FOR ANY
035: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
036: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
037: * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
038: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
039: * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
040: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
041: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
042: *
043: * ====================================================================
044: *
045: * This software consists of voluntary contributions made by many
046: * individuals on behalf of Collab.Net.
047: */
048:
049: import org.apache.oro.text.regex.MalformedPatternException;
050: import org.apache.oro.text.regex.Pattern;
051: import org.apache.oro.text.regex.PatternCompiler;
052: import org.apache.oro.text.regex.Perl5Compiler;
053: import org.apache.oro.text.regex.Perl5Matcher;
054: import org.apache.oro.text.regex.Perl5Substitution;
055: import org.apache.oro.text.regex.Substitution;
056: import org.apache.oro.text.regex.Util;
057: import org.apache.oro.util.Cache;
058: import org.apache.oro.util.CacheLRU;
059:
060: /**
061: * This is a utility class for processing regular expressions
062: * based on oro.
063: *
064: * @author <a href="mailto:dabboussaxess.com">Hussayn Dabbous</a>
065: * @version $Id: ReferenceInsertionFilter.java 7365 2003-03-15 21:56:59Z jon $
066: */
067: public class RegexProcessor extends Object {
068:
069: protected static Cache patterns = new CacheLRU();
070: protected static Cache substitutions = new CacheLRU();
071:
072: private PatternCompiler compiler;
073:
074: public RegexProcessor() {
075: compiler = new Perl5Compiler();
076: }
077:
078: public String process(String input, String regex,
079: String substitution) throws MalformedPatternException {
080: String result = input;
081: Pattern pattern = (Pattern) patterns.getElement(regex);
082: if (pattern == null) {
083: pattern = compiler.compile(regex);
084: patterns.addElement(regex, pattern);
085: }
086:
087: Substitution subst = (Substitution) substitutions
088: .getElement(substitution);
089: if (subst == null) {
090: subst = new Perl5Substitution(substitution);
091: substitutions.addElement(substitution, subst);
092: }
093:
094: Perl5Matcher matcher = new Perl5Matcher();
095:
096: result = Util.substitute(matcher, pattern, subst, input,
097: Util.SUBSTITUTE_ALL);
098:
099: return result;
100: }
101:
102: }
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