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Java > Open Source Codes > org > htmlparser > visitors > UrlModifyingVisitor


1 // HTMLParser Library $Name: v1_5_20050313 $ - A java-based parser for HTML
2 // http://sourceforge.org/projects/htmlparser
3 // Copyright (C) 2004 Joshua Kerievsky
4 //
5 // Revision Control Information
6 //
7 // $Source: /cvsroot/htmlparser/htmlparser/src/org/htmlparser/visitors/UrlModifyingVisitor.java,v $
8 // $Author: derrickoswald $
9 // $Date: 2004/07/31 16:42:35 $
10 // $Revision: 1.46 $
11 //
12 // This library is free software; you can redistribute it and/or
13 // modify it under the terms of the GNU Lesser General Public
14 // License as published by the Free Software Foundation; either
15 // version 2.1 of the License, or (at your option) any later version.
16 //
17 // This library is distributed in the hope that it will be useful,
18 // but WITHOUT ANY WARRANTY; without even the implied warranty of
19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 // Lesser General Public License for more details.
21 //
22 // You should have received a copy of the GNU Lesser General Public
23 // License along with this library; if not, write to the Free Software
24 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 //
26
27 package org.htmlparser.visitors;
28
29 import org.htmlparser.Node;
30 import org.htmlparser.Remark;
31 import org.htmlparser.Text;
32 import org.htmlparser.tags.CompositeTag;
33 import org.htmlparser.tags.ImageTag;
34 import org.htmlparser.tags.LinkTag;
35 import org.htmlparser.Tag;
36
37 public class UrlModifyingVisitor extends NodeVisitor {
38     private String JavaDoc linkPrefix;
39     private StringBuffer JavaDoc modifiedResult;
40
41     public UrlModifyingVisitor(String JavaDoc linkPrefix) {
42         super(true,true);
43         this.linkPrefix =linkPrefix;
44         modifiedResult = new StringBuffer JavaDoc();
45     }
46
47     public void visitRemarkNode (Remark remarkNode)
48     {
49         modifiedResult.append (remarkNode.toHtml());
50     }
51
52     public void visitStringNode(Text stringNode)
53     {
54         modifiedResult.append (stringNode.toHtml());
55     }
56
57     public void visitTag(Tag tag)
58     {
59         if (tag instanceof LinkTag)
60             ((LinkTag)tag).setLink(linkPrefix + ((LinkTag)tag).getLink());
61         else if (tag instanceof ImageTag)
62             ((ImageTag)tag).setImageURL(linkPrefix + ((ImageTag)tag).getImageURL());
63         // process only those nodes that won't be processed by an end tag,
64 // nodes without parents or parents without an end tag, since
65 // the complete processing of all children should happen before
66 // we turn this node back into html text
67 if (null == tag.getParent ()
68             && (!(tag instanceof CompositeTag) || null == ((CompositeTag)tag).getEndTag ()))
69             modifiedResult.append(tag.toHtml());
70     }
71
72     public void visitEndTag(Tag tag)
73     {
74         Node parent;
75         
76         parent = tag.getParent ();
77         // process only those nodes not processed by a parent
78 if (null == parent)
79             // an orphan end tag
80 modifiedResult.append(tag.toHtml());
81         else
82             if (null == parent.getParent ())
83                 // a top level tag with no parents
84 modifiedResult.append(parent.toHtml());
85     }
86
87     public String JavaDoc getModifiedResult() {
88         return modifiedResult.toString();
89     }
90 }
91
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