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Java > Open Source Codes > com > icl > saxon > style > SAXONWhile


1 package com.icl.saxon.style;
2 import com.icl.saxon.tree.AttributeCollection;
3 import com.icl.saxon.*;
4 import com.icl.saxon.expr.*;
5 import javax.xml.transform.*;
6
7
8 /**
9 * Handler for saxon:while elements in stylesheet.<BR>
10 * The saxon:while element has a mandatory attribute test, a boolean expression.
11 * The content is output repeatedly so long as the test condition is true.
12 */
13
14 public class SAXONWhile extends StyleElement {
15
16     private Expression test;
17
18     /**
19     * Determine whether this node is an instruction.
20     * @return true - it is an instruction
21     */
22
23     public boolean isInstruction() {
24         return true;
25     }
26
27     /**
28     * Determine whether this type of element is allowed to contain a template-body
29     * @return true: yes, it may contain a template-body
30     */
31
32     public boolean mayContainTemplateBody() {
33         return true;
34     }
35
36     public void prepareAttributes() throws TransformerConfigurationException {
37
38         String JavaDoc testAtt=null;
39
40         StandardNames sn = getStandardNames();
41         AttributeCollection atts = getAttributeList();
42                 
43         for (int a=0; a<atts.getLength(); a++) {
44             int nc = atts.getNameCode(a);
45             int f = nc & 0xfffff;
46             if (f==sn.NAME) {
47                 //
48 } else if (f==sn.TEST) {
49                 testAtt = atts.getValue(a);
50             } else {
51                 checkUnknownAttribute(nc);
52             }
53         }
54         
55         if (testAtt==null) {
56             reportAbsence("test");
57             return;
58         }
59         test = makeExpression(testAtt);
60     }
61
62     public void validate() throws TransformerConfigurationException {
63         checkWithinTemplate();
64         //checkElementExtensions("saxon");
65 }
66
67     public void process(Context context) throws TransformerException
68     {
69         while (test.evaluateAsBoolean(context)) {
70             processChildren(context);
71         }
72     }
73
74 }
75
76 //
77 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
78 // you may not use this file except in compliance with the License. You may obtain a copy of the
79 // License at http://www.mozilla.org/MPL/
80 //
81 // Software distributed under the License is distributed on an "AS IS" basis,
82 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
83 // See the License for the specific language governing rights and limitations under the License.
84 //
85 // The Original Code is: all this file.
86 //
87 // The Initial Developer of the Original Code is
88 // Michael Kay of International Computers Limited (mhkay@iclway.co.uk).
89 //
90 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
91 //
92 // Contributor(s): none.
93 //
94
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