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Java > Open Source Codes > net > sf > saxon > style > XSLFallback


1 package net.sf.saxon.style;
2 import net.sf.saxon.expr.Expression;
3 import net.sf.saxon.instruct.Executable;
4 import net.sf.saxon.om.AttributeCollection;
5 import net.sf.saxon.trans.XPathException;
6
7 import javax.xml.transform.TransformerConfigurationException JavaDoc;
8
9 /**
10 * xsl:fallback element in stylesheet. <br>
11 */
12
13 public class XSLFallback extends StyleElement {
14
15     /**
16     * Determine whether this node is an instruction.
17     * @return true - it is an instruction
18     */
19
20     public boolean isInstruction() {
21         return true;
22     }
23
24     /**
25     * Determine whether this type of element is allowed to contain a template-body
26     * @return true: yes, it may contain a template-body
27     */
28
29     public boolean mayContainSequenceConstructor() {
30         return true;
31     }
32
33     public void prepareAttributes() throws XPathException {
34         AttributeCollection atts = getAttributeList();
35         for (int a=0; a<atts.getLength(); a++) {
36             int nc = atts.getNameCode(a);
37             checkUnknownAttribute(nc);
38         }
39     }
40
41     public void validate() throws XPathException {
42         // Parent elements are now responsible for validating their children
43 // StyleElement parent = (StyleElement)getParent();
44 // if (!parent.mayContainFallback()) {
45 // compileError("xsl:fallback is not allowed as a child of " + parent.getDisplayName(), "XT0010");
46 // }
47 }
48
49     public Expression compile(Executable exec) throws XPathException {
50         // if we get here, then the parent instruction is OK, so the fallback is not activated
51 return null;
52     }
53
54 }
55
56 //
57 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
58 // you may not use this file except in compliance with the License. You may obtain a copy of the
59 // License at http://www.mozilla.org/MPL/
60 //
61 // Software distributed under the License is distributed on an "AS IS" basis,
62 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
63 // See the License for the specific language governing rights and limitations under the License.
64 //
65 // The Original Code is: all this file.
66 //
67 // The Initial Developer of the Original Code is Michael H. Kay.
68 //
69 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
70 //
71 // Contributor(s): none.
72 //
73
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