Rewriter


1   /*
2    * Copyright 2000-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.jetspeed.util.rewriter;
18  
19  // java.io
20  import java.io.Reader  ;
21  
22  // java.net
23  import java.net.MalformedURLException  ;
24  
25  // this makes it dependent on Swing...need an abstraction WTP
26  import javax.swing.text.html.HTML  ;
27  import javax.swing.text.MutableAttributeSet  ;
28  
29  /**
30   * 
31   * Interface for  URL rewriting.
32   *
33   * @author <a HREF="mailto:taylor@apache.org">David Sean Taylor</a>
34   * @version $Id: Rewriter.java,v 1.6 2004/02/23 03:18:59 jford Exp $
35   */
36  
37  public interface Rewriter
38  {
39  
40      /*
41       * Entry point into rewriting HTML content.
42       *
43       * Reads stream from proxied host, runs configured HTML parser against that stream,
44       * rewriting relevant links, and writes the parsed stream back to the client.
45       *
46       * @param input the HTML input stream.
47       * @param input the base URL host string used to create full links back to host
48       * @return the rewritten HTML output stream.
49       *
50       * @exception MalformedURLException a servlet exception.
51       */
52      String   rewrite(Reader   input, String   baseURL)
53              throws MalformedURLException  ;
54                                 
55  
56      /* <p>
57       * This callback is called by the HTMLParserAdaptor implementation to write
58       * back all rewritten URLs to point to the proxy server. Each implementation
59       * writes specifically for their own type of resources.</p>
60       * <p>
61       * Given the targetURL, rewrites the link as a link back to the proxy server.     
62       * </p>
63       * @param targetURL the URL to be rewritten back to the proxy server.
64       * @param baseURL the base URL of the target host.
65       * @param proxyURL the base URL of the proxy server.
66       * @return the rewritten URL to the proxy server.
67       *
68       * @exception MalformedURLException a servlet exception.
69       */
70      String   generateNewUrl(String   targetURL, HTML.Tag   tag, HTML.Attribute   attribute);
71  
72      /*
73       * Returns true if all rewritten URLs should be sent back to the proxy server.
74       *
75       * @return true if all URLs are rewritten back to proxy server.
76       */        
77      boolean proxyAllTags();
78  
79      // parser event handling
80      boolean enterSimpleTagEvent(HTML.Tag   tag, MutableAttributeSet   attrs);
81      String   exitSimpleTagEvent(HTML.Tag   tag, MutableAttributeSet   attrs);
82  
83      boolean enterStartTagEvent(HTML.Tag   tag, MutableAttributeSet   attrs);
84      String   exitStartTagEvent(HTML.Tag   tag, MutableAttributeSet   attrs);
85  
86      boolean enterEndTagEvent(HTML.Tag   tag);
87      String   exitEndTagEvent(HTML.Tag   tag);
88  
89      boolean enterText(char[] values, int param);
90  
91      void convertTagEvent(HTML.Tag   tag, MutableAttributeSet   attrs);
92  }
93  
94
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