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Java > Open Source Codes > org > htmlparser > tags > BaseHrefTag


1 // HTMLParser Library $Name: v1_5_20050313 $ - A java-based parser for HTML
2 // http://sourceforge.org/projects/htmlparser
3 // Copyright (C) 2004 Somik Raha
4 //
5 // Revision Control Information
6 //
7 // $Source: /cvsroot/htmlparser/htmlparser/src/org/htmlparser/tags/BaseHrefTag.java,v $
8 // $Author: derrickoswald $
9 // $Date: 2004/07/02 00:49:28 $
10 // $Revision: 1.39 $
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.tags;
28
29 import org.htmlparser.lexer.Page;
30 import org.htmlparser.nodes.TagNode;
31 import org.htmlparser.util.ParserException;
32
33 /**
34  * BaseHrefTag represents an <Base> tag.
35  * It extends a basic tag by providing an accessor to the HREF attribute.
36  */
37 public class BaseHrefTag
38     extends
39         TagNode
40 {
41     /**
42      * The set of names handled by this tag.
43      */
44     private static final String JavaDoc[] mIds = new String JavaDoc[] {"BASE"};
45
46     /**
47      * Create a new base tag.
48      */
49     public BaseHrefTag ()
50     {
51     }
52
53     /**
54      * Return the set of names handled by this tag.
55      * @return The names to be matched that create tags of this type.
56      */
57     public String JavaDoc[] getIds ()
58     {
59         return (mIds);
60     }
61
62     /**
63      * Get the value of the HREF attribute, if any.
64      * @return The HREF value, with the last slash removed, if any.
65      */
66     public String JavaDoc getBaseUrl()
67     {
68         String JavaDoc base;
69
70         base = getAttribute ("HREF");
71         if (base != null && base.length() > 0)
72             base = base.trim ();
73         base = (null == base) ? "" : base;
74         
75         return (base);
76     }
77
78     public void setBaseUrl (String JavaDoc base)
79     {
80         setAttribute ("HREF", base);
81     }
82
83     /**
84      * Perform the meaning of this tag.
85      * This sets the base URL to use for the rest of the page.
86      */
87     public void doSemanticAction () throws ParserException
88     {
89         Page page;
90         
91         page = getPage ();
92         if (null != page)
93         {
94             page.setBaseUrl (getBaseUrl ());
95         }
96     }
97 }
98
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