1 // ========================================================================
2 // Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
3 // ------------------------------------------------------------------------
4 // All rights reserved. This program and the accompanying materials
5 // are made available under the terms of the Eclipse Public License v1.0
6 // and Apache License v2.0 which accompanies this distribution.
7 // The Eclipse Public License is available at
8 // http://www.eclipse.org/legal/epl-v10.html
9 // The Apache License v2.0 is available at
10 // http://www.opensource.org/licenses/apache2.0.php
11 // You may elect to redistribute this code under either of these licenses.
12 // ========================================================================
13 package org.eclipse.jetty.rewrite.handler;
14
15 import java.io.IOException;
16 import java.util.regex.Matcher;
17
18 import javax.servlet.http.HttpServletRequest;
19 import javax.servlet.http.HttpServletResponse;
20
21 /**
22 * Rewrite the URI by matching with a regular expression.
23 * The replacement string may use $n" to replace the nth capture group.
24 */
25 public class RewriteRegexRule extends RegexRule
26 {
27 private String _replacement;
28
29 /* ------------------------------------------------------------ */
30 public RewriteRegexRule()
31 {
32 _handling = false;
33 _terminating = false;
34 }
35
36 /* ------------------------------------------------------------ */
37 /**
38 * Whenever a match is found, it replaces with this value.
39 *
40 * @param replacement the replacement string.
41 */
42 public void setReplacement(String replacement)
43 {
44 _replacement = replacement;
45 }
46
47
48 /* ------------------------------------------------------------ */
49 /* (non-Javadoc)
50 * @see org.eclipse.jetty.server.handler.rules.RegexRule#apply(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.util.regex.Matcher)
51 */
52 public String apply(String target, HttpServletRequest request, HttpServletResponse response, Matcher matcher) throws IOException
53 {
54 target=_replacement;
55 for (int g=1;g<=matcher.groupCount();g++)
56 {
57 String group = matcher.group(g);
58 target=target.replaceAll("\\$"+g,group);
59 }
60
61 return target;
62 }
63
64 /* ------------------------------------------------------------ */
65 /**
66 * Returns the replacement string.
67 */
68 public String toString()
69 {
70 return super.toString()+"["+_replacement+"]";
71 }
72 }