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org.apache.jetspeed.rewriter.html.neko.CallbackElementRemover	0%	0%

1		/*
2		* Licensed to the Apache Software Foundation (ASF) under one or more
3		* contributor license agreements. See the NOTICE file distributed with
4		* this work for additional information regarding copyright ownership.
5		* The ASF licenses this file to You under the Apache License, Version 2.0
6		* (the "License"); you may not use this file except in compliance with
7		* the License. You may obtain a copy of the License at
8		*
9		* http://www.apache.org/licenses/LICENSE-2.0
10		*
11		* Unless required by applicable law or agreed to in writing, software
12		* distributed under the License is distributed on an "AS IS" BASIS,
13		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14		* See the License for the specific language governing permissions and
15		* limitations under the License.
16		*/
17		package org.apache.jetspeed.rewriter.html.neko;
18
19		import org.apache.jetspeed.rewriter.Rewriter;
20		import org.apache.xerces.xni.Augmentations;
21		import org.apache.xerces.xni.QName;
22		import org.apache.xerces.xni.XMLAttributes;
23		import org.apache.xerces.xni.XMLString;
24		import org.apache.xerces.xni.XNIException;
25		import org.cyberneko.html.filters.ElementRemover;
26
27		/**
28		* <p>
29		* CallbackElementRemover
30		* </p>
31		* <p>
32		* Extended version of the NekoHTML ElementRemover which provides
33		* tag stripping/removal based on Rewriter settings.
34		* </p>
35		*
36		* @author <a href="mailto:weaver@apache.org">Scott T. Weaver </a>
37		* @version $Id: CallbackElementRemover.java 517719 2007-03-13 15:05:48Z ate $
38		*
39		*/
40		public class CallbackElementRemover extends ElementRemover
41		{
42
43		private Rewriter rewriter;
44
45		/**
46		* Construct with reference to the rewriter context to consult for rewriting advice
47		*/
48		public CallbackElementRemover( Rewriter rewriter )
49		{
50	0	super();
51
52	0	this.rewriter = rewriter;
53	0	}
54
55
56		// Base Class Protocol
57
58		/**
59		* <p>
60		* comment
61		* </p>
62		*
63		* @see org.apache.xerces.xni.XMLDocumentHandler#comment(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs)
64		* @param text
65		* @param augs
66		* @throws org.apache.xerces.xni.XNIException
67		*/
68		public void comment(XMLString text,Augmentations augs) throws XNIException
69		{
70	0	if (rewriter.shouldRemoveComments())
71	0	return;
72	0	super.comment(text,augs);
73	0	}
74
75		/**
76		* <p>
77		* emptyElement
78		* </p>
79		*
80		* @see org.apache.xerces.xni.XMLDocumentHandler#emptyElement(org.apache.xerces.xni.QName,
81		* org.apache.xerces.xni.XMLAttributes,
82		* org.apache.xerces.xni.Augmentations)
83		* @param element
84		* @param arg1
85		* @param arg2
86		* @throws org.apache.xerces.xni.XNIException
87		*/
88		public void emptyElement( QName element, XMLAttributes attrs, Augmentations arg2 ) throws XNIException
89		{
90	0	processTag(element,attrs) ;
91	0	super.emptyElement(element, attrs, arg2);
92	0	}
93
94		/**
95		* <p>
96		* startElement
97		* </p>
98		*
99		* @see org.apache.xerces.xni.XMLDocumentHandler#startElement(org.apache.xerces.xni.QName,
100		* org.apache.xerces.xni.XMLAttributes,
101		* org.apache.xerces.xni.Augmentations)
102		* @param element
103		* @param arg1
104		* @param arg2
105		* @throws org.apache.xerces.xni.XNIException
106		*/
107		public void startElement( QName element, XMLAttributes attrs, Augmentations arg2 ) throws XNIException
108		{
109	0	processTag(element,attrs);
110	0	super.startElement(element, attrs, arg2);
111	0	}
112
113
114		// Support Methods
115
116		/**
117		* <p>
118		* processTag
119		* </p>
120		*
121		* @param tag
122		*/
123		protected void processTag(QName element, XMLAttributes attrs)
124		{
125	0	String tag = element.rawname.toLowerCase();
126	0	if (fRemovedElements.contains(tag))
127		{
128		// alread removed
129	0	return ;
130		}
131	0	else if (rewriter.shouldStripTag(tag))
132		{
133		// first time for this tag...
134		// strip - remove tag and any text associated with it
135	0	removeElement(tag);
136	0	return ;
137		}
138	0	else if (rewriter.shouldRemoveTag(tag))
139		{
140		// BOZO - block intentially left EMPTY
141
142		// first time for this tag...
143		// remove - no directive necessary, the default behavior of ElementRemover is to drop tags that it does not know about (but the assocated text will remain)
144	0	return ;
145		}
146
147		// OTHERWISE - explicitly accept (keep tag and associated text)
148		// NOTE: even if fAcceptedElements contains the tag already, we need to reset the attribute names for this invocation context
149	0	rewriter.enterConvertTagEvent(tag,new XMLAttributesWrapper(attrs));
150	0	acceptElement(tag,getAttributeNames(attrs));
151	0	}
152		protected String[] getAttributeNames(XMLAttributes attrs)
153		{
154	0	int length = attrs != null ? attrs.getLength() : 0 ;
155	0	String[] names = length > 0 ? new String[ length ] : null ;
156
157	0	for( int i = 0, limit = length;i<limit;i++)
158		{
159	0	names[i] = attrs.getQName(i) ;
160		}
161	0	return names ;
162		}
163		}

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