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Java > Open Source Codes > com > icl > saxon > output > ErrorEmitter


1 package com.icl.saxon.output;
2 import com.icl.saxon.*;
3 //import com.icl.saxon.om.Name;
4 import com.icl.saxon.om.Namespace;
5 import com.icl.saxon.om.NamePool;
6
7 import org.xml.sax.Attributes JavaDoc;
8 //import org.w3c.dom.*;
9 import javax.xml.transform.TransformerException JavaDoc;
10
11 import java.io.Writer JavaDoc;
12
13
14 /**
15   * ErrorEmitter is an Emitter that generates an error message if any attempt
16   * is made to produce output. It is used while a saxon:function is active to
17   * prevent functions writing to the result tree.
18   */
19   
20 public class ErrorEmitter extends Emitter
21 {
22     /**
23     * Start of the document.
24     */
25     
26     public void startDocument () throws TransformerException JavaDoc {}
27
28     /**
29     * End of the document.
30     */
31     
32     public void endDocument () throws TransformerException JavaDoc {}
33
34     /**
35     * Start of an element. Output the start tag, escaping special characters.
36     */
37     
38     public void startElement (int name, Attributes JavaDoc attributes,
39                               int[] namespaces, int nscount) throws TransformerException JavaDoc
40     {
41         error();
42     }
43     
44     /**
45     * End of an element.
46     */
47
48     public void endElement (int name) throws TransformerException JavaDoc
49     {
50         error();
51     }
52
53
54     /**
55     * Character data.
56     */
57
58     public void characters (char[] ch, int start, int length) throws TransformerException JavaDoc
59     {
60         error();
61     }
62
63
64     /**
65     * Handle a processing instruction.
66     */
67     
68     public void processingInstruction (String JavaDoc target, String JavaDoc data)
69         throws TransformerException JavaDoc
70     {
71         error();
72     }
73
74     /**
75     * Handle a comment.
76     */
77     
78     public void comment (char ch[], int start, int length) throws TransformerException JavaDoc
79     {
80         error();
81     }
82
83     /**
84     * Report an error: can't write to result tree
85     */
86
87     private void error() throws TransformerException JavaDoc {
88         throw new TransformerException JavaDoc("Cannot write to result tree while executing a function");
89     }
90
91
92     
93 }
94
95 //
96 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
97 // you may not use this file except in compliance with the License. You may obtain a copy of the
98 // License at http://www.mozilla.org/MPL/
99 //
100 // Software distributed under the License is distributed on an "AS IS" basis,
101 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
102 // See the License for the specific language governing rights and limitations under the License.
103 //
104 // The Original Code is: all this file.
105 //
106 // The Initial Developer of the Original Code is
107 // Michael Kay of International Computers Limited (mhkay@iclway.co.uk).
108 //
109 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
110 //
111 // Contributor(s): none.
112 //
113
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