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1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the  "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 /*
19  * $Id: XSLTVisitor.java 468643 2006-10-28 06:56:03Z minchau $
20  */
21 package org.apache.xalan.templates;
22 
23 import org.apache.xpath.XPathVisitor;
24 
25 /**
26  * A derivation from this class can be passed to a class that implements
27  * the XSLTVisitable interface, to have the appropriate method called
28  * for each component of an XSLT stylesheet.  Aside from possible other uses,
29  * the main intention is to provide a reasonable means to perform expression
30  * rewriting.
31  */
32 public class XSLTVisitor extends XPathVisitor
33 {
34 	/**
35 	 * Visit an XSLT instruction.  Any element that isn't called by one
36 	 * of the other visit methods, will be called by this method.
37 	 *
38 	 * @param elem The xsl instruction element object.
39 	 * @return true if the sub expressions should be traversed.
40 	 */
visitInstruction(ElemTemplateElement elem)41 	public boolean visitInstruction(ElemTemplateElement elem)
42 	{
43 		return true;
44 	}
45 
46 	/**
47 	 * Visit an XSLT stylesheet instruction.
48 	 *
49 	 * @param elem The xsl instruction element object.
50 	 * @return true if the sub expressions should be traversed.
51 	 */
visitStylesheet(ElemTemplateElement elem)52 	public boolean visitStylesheet(ElemTemplateElement elem)
53 	{
54 		return true;
55 	}
56 
57 
58 	/**
59 	 * Visit an XSLT top-level instruction.
60 	 *
61 	 * @param elem The xsl instruction element object.
62 	 * @return true if the sub expressions should be traversed.
63 	 */
visitTopLevelInstruction(ElemTemplateElement elem)64 	public boolean visitTopLevelInstruction(ElemTemplateElement elem)
65 	{
66 		return true;
67 	}
68 
69 	/**
70 	 * Visit an XSLT top-level instruction.
71 	 *
72 	 * @param elem The xsl instruction element object.
73 	 * @return true if the sub expressions should be traversed.
74 	 */
visitTopLevelVariableOrParamDecl(ElemTemplateElement elem)75 	public boolean visitTopLevelVariableOrParamDecl(ElemTemplateElement elem)
76 	{
77 		return true;
78 	}
79 
80 
81 	/**
82 	 * Visit an XSLT variable or parameter declaration.
83 	 *
84 	 * @param elem The xsl instruction element object.
85 	 * @return true if the sub expressions should be traversed.
86 	 */
visitVariableOrParamDecl(ElemVariable elem)87 	public boolean visitVariableOrParamDecl(ElemVariable elem)
88 	{
89 		return true;
90 	}
91 
92 	/**
93 	 * Visit a LiteralResultElement.
94 	 *
95 	 * @param elem The literal result object.
96 	 * @return true if the sub expressions should be traversed.
97 	 */
visitLiteralResultElement(ElemLiteralResult elem)98 	public boolean visitLiteralResultElement(ElemLiteralResult elem)
99 	{
100 		return true;
101 	}
102 
103 	/**
104 	 * Visit an Attribute Value Template (at the top level).
105 	 *
106 	 * @param elem The attribute value template object.
107 	 * @return true if the sub expressions should be traversed.
108 	 */
visitAVT(AVT elem)109 	public boolean visitAVT(AVT elem)
110 	{
111 		return true;
112 	}
113 
114 
115 	/**
116 	 * Visit an extension element.
117 	 * @param elem The extension object.
118 	 * @return true if the sub expressions should be traversed.
119 	 */
visitExtensionElement(ElemExtensionCall elem)120 	public boolean visitExtensionElement(ElemExtensionCall elem)
121 	{
122 		return true;
123 	}
124 
125 }
126 
127