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 */
21package org.apache.xalan.templates;
22
23import 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 */
32public 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	 */
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	 */
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	 */
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	 */
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	 */
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	 */
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	 */
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	 */
120	public boolean visitExtensionElement(ElemExtensionCall elem)
121	{
122		return true;
123	}
124
125}
126
127