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Java > Open Source Codes > com > icl > saxon > TreeDriver


1
2 package com.icl.saxon;
3 import com.icl.saxon.om.*;
4 import com.icl.saxon.output.Outputter;
5 import com.icl.saxon.output.GeneralOutputter;
6 import org.xml.sax.*;
7 import org.w3c.dom.Document JavaDoc;
8
9
10 import java.util.Properties JavaDoc;
11
12 import javax.xml.transform.TransformerException JavaDoc;
13 import javax.xml.transform.sax.SAXResult JavaDoc;
14
15
16 /**
17 * TreeDriver.java: (pseudo-)SAX driver for Saxon trees.<BR>
18 * Subclasses DOMDriver for the case where the tree is a Saxon tree (a DocumentInfo)
19 * This class simulates the action of a SAX Parser, taking an already-constructed
20 * DOM Document and walking around it in a depth-first traversal,
21 * calling a SAX-compliant ContentHandler to process the children as it does so.
22 */
23
24 public class TreeDriver extends DOMDriver
25 {
26
27     private Outputter outputter;
28   
29     /**
30     * Set the DOM Document that will be walked
31     */
32
33     public void setDocument(Document JavaDoc doc) {
34         root = doc;
35         if (!(doc instanceof DocumentInfo)) {
36             throw new IllegalArgumentException JavaDoc("TreeDriver can only be used with a Saxon tree");
37         }
38     }
39
40     /**
41     * Set the DOM Document that will be walked
42     */
43
44     //public void setDocumentInfo(DocumentInfo doc) {
45 // root = doc;
46 //}
47
48     /**
49     * Walk a document (traversing the nodes depth first)
50     * @param doc The (DOM) Document object to walk.
51     * @exception SAXException On any error in the document
52     */
53
54     public void parse() throws SAXException
55     {
56         if (root==null) {
57             throw new SAXException("TreeDriver: no start node defined");
58         }
59         if (contentHandler==null) {
60             throw new SAXException("DOMDriver: no content handler defined");
61         }
62         contentHandler.setDocumentLocator(this);
63         DocumentInfo doc = (DocumentInfo)root;
64         try {
65             GeneralOutputter outputter = new GeneralOutputter(doc.getNamePool());
66             SAXResult JavaDoc result = new SAXResult JavaDoc(contentHandler);
67             result.setSystemId(systemId);
68             outputter.setOutputDestination(new Properties JavaDoc(), result);
69             doc.copy(outputter);
70             outputter.close();
71         } catch (TransformerException JavaDoc err) {
72             throw new SAXException(err);
73         }
74     }
75
76 }
77 //
78 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
79 // you may not use this file except in compliance with the License. You may obtain a copy of the
80 // License at http://www.mozilla.org/MPL/
81 //
82 // Software distributed under the License is distributed on an "AS IS" basis,
83 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
84 // See the License for the specific language governing rights and limitations under the License.
85 //
86 // The Original Code is: all this file.
87 //
88 // The Initial Developer of the Original Code is
89 // Michael Kay of International Computers Limited (mhkay@iclway.co.uk).
90 //
91 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
92 //
93 // Contributor(s): none.
94 //
95
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