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Java > Open Source Codes > org > jahia > utils > xml > DtdEntityResolver


1 //
2 // ____.
3 // __/\ ______| |__/\. _______
4 // __ .____| | \ | +----+ \
5 // _______| /--| | | - \ _ | : - \_________
6 // \\______: :---| : : | : | \________>
7 // |__\---\_____________:______: :____|____:_____\
8 // /_____|
9 //
10 // . . . i n j a h i a w e t r u s t . . .
11 //
12 //
13 //
14 // DtdEntityResolver
15 //
16 // NK 08.03.2001
17 //
18
19 package org.jahia.utils.xml;
20
21
22 import java.io.File JavaDoc;
23 import java.io.FileInputStream JavaDoc;
24 import java.io.FileNotFoundException JavaDoc;
25 import java.util.Hashtable JavaDoc;
26
27 import org.xml.sax.EntityResolver JavaDoc;
28 import org.xml.sax.InputSource JavaDoc;
29
30
31 /**
32  * Substitute external DTD files with local DTD files.
33  *
34  * @author Khue
35  * @version 1.0
36  */
37 public class DtdEntityResolver implements EntityResolver JavaDoc {
38
39     /**
40      * Registered DTD, the key is the public id
41      */
42     private Hashtable JavaDoc m_DTDs = new Hashtable JavaDoc();
43     
44
45     /**
46      * Replace external dtd with local dtd.
47      * Return an InputSource to a local DTD file or null if not found
48      * in the registered DTD
49      *
50      */
51     public InputSource JavaDoc resolveEntity (String JavaDoc publicID, String JavaDoc systemID) {
52
53         //System.out.println("DtdEntityResolver: " + publicID + " " + systemID);
54
55         if ( publicID == null ){
56             return null;
57         }
58         
59         String JavaDoc dtd = null;
60                 
61         if ( m_DTDs.get(publicID) != null ){
62             dtd = (String JavaDoc) m_DTDs.get(publicID);
63         }
64         
65         if( dtd != null ) {
66             //System.out.println("DtdEntityResolver: found dtd ");
67 File JavaDoc f = new File JavaDoc( dtd );
68             if( f.exists() )
69             try {
70                 return new InputSource JavaDoc(new FileInputStream JavaDoc(f));
71             } catch( FileNotFoundException JavaDoc ex ) {
72             }
73         }
74
75         return null;
76     }
77
78
79     /**
80      *
81      * @param publicID the key to identify the requested dtd
82      * @param dtd the dtd resource file
83      */
84     public void registerDTD(String JavaDoc publicID, String JavaDoc dtd) {
85     
86         m_DTDs.put(publicID, dtd);
87
88     }
89
90
91 }
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