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1   // ////////////////////////////////////////////////////////////////////////////
2   // dexterIM - Instant Messaging Framework
3   // Copyright (C) 2003 Christoph Walcher
4   //
5   // This program is free software; you can redistribute it and/or modify
6   // it under the terms of the GNU General Public License as published by
7   // the Free Software Foundation; either version 2 of the License, or
8   // (at your option) any later version.
9   //
10  // This program is distributed in the hope that it will be useful,
11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  // GNU General Public License for more details.
14  //
15  // You should have received a copy of the GNU General Public License
16  // along with this program; if not, write to the Free Software
17  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  //////////////////////////////////////////////////////////////////////////////
19  package net.sf.dexterim.ui;
20  
21  import java.util.regex.Matcher;
22  import java.util.regex.Pattern;
23  
24  
25  /***
26   * @author christoph
27   *
28   */
29  public class RegularExpressionFilter implements FilterMask {
30  	private Pattern pattern = null;
31  	
32  	private String regex;
33  	
34  	public RegularExpressionFilter(String regex) {
35  		this.regex = regex;
36  		
37  		updatePattern(this.regex);
38  	}
39  	
40  	public RegularExpressionFilter() {
41  		
42  	}
43  
44  	/***
45  	 * @see net.sf.dexterim.ui.FilterMask#filter(java.lang.String)
46  	 */
47  	public String filter(String text) {
48  		StringBuffer returnValue = new StringBuffer();
49  		
50  		if (pattern != null) {
51  			Matcher m = pattern.matcher(text);
52  			
53  			while (m.find()) {
54  				returnValue.append(text.substring(m.start(), m.end()));
55  			}
56  		}
57  		
58  		return returnValue.toString();
59  	}
60  	
61  	/***
62  	 * @return Returns the regex.
63  	 */
64  	public String getRegex() {
65  		return regex;
66  	}
67  	
68  	/***
69  	 * @param regex The regex to set.
70  	 */
71  	public void setRegex(String regex) {
72  		this.regex = regex;
73  		
74  		updatePattern(this.regex);
75  	}
76  	
77  	protected void updatePattern(String regex) {
78  		this.pattern = Pattern.compile(regex);
79  	}
80  	
81  	public String toString() {
82  		return "Regex " + regex;
83  	}
84  }