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Java > Open Source Codes > org > apache > commons > jelly > util > SafeContentHandler


1 /*
2  * Copyright 2002,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.jelly.util;
17
18 import org.xml.sax.Attributes JavaDoc;
19 import org.xml.sax.ContentHandler JavaDoc;
20 import org.xml.sax.Locator JavaDoc;
21 import org.xml.sax.SAXException JavaDoc;
22
23 /**
24  * Ensures that only one start and end document event is passed onto the underlying
25  * ContentHandler. This object can only be used once and then discarded.
26  *
27  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
28  */
29 public class SafeContentHandler implements ContentHandler JavaDoc {
30     private ContentHandler JavaDoc handler;
31     private boolean documentStarted;
32     private boolean documentEnded;
33
34     public SafeContentHandler(ContentHandler JavaDoc handler) {
35         this.handler = handler;
36     }
37
38     /**
39      * @throws org.xml.sax.SAXException
40      */
41     public void startDocument() throws SAXException JavaDoc {
42         if (! documentStarted) {
43             handler.startDocument();
44             documentStarted = true;
45         }
46     }
47
48     /**
49      * @throws org.xml.sax.SAXException
50      */
51     public void endDocument() throws SAXException JavaDoc {
52         if (! documentEnded) {
53             handler.endDocument();
54             documentEnded = true;
55         }
56     }
57
58     /**
59      * @param arg0
60      * @param arg1
61      * @param arg2
62      * @throws org.xml.sax.SAXException
63      */
64     public void characters(char[] arg0, int arg1, int arg2)
65         throws SAXException JavaDoc {
66         handler.characters(arg0, arg1, arg2);
67     }
68
69     /**
70      * @param arg0
71      * @param arg1
72      * @param arg2
73      * @throws org.xml.sax.SAXException
74      */
75     public void endElement(String JavaDoc arg0, String JavaDoc arg1, String JavaDoc arg2)
76         throws SAXException JavaDoc {
77         handler.endElement(arg0, arg1, arg2);
78     }
79
80     /**
81      * @param arg0
82      * @throws org.xml.sax.SAXException
83      */
84     public void endPrefixMapping(String JavaDoc arg0) throws SAXException JavaDoc {
85         handler.endPrefixMapping(arg0);
86     }
87
88     /**
89      * @param arg0
90      * @param arg1
91      * @param arg2
92      * @throws org.xml.sax.SAXException
93      */
94     public void ignorableWhitespace(char[] arg0, int arg1, int arg2)
95         throws SAXException JavaDoc {
96         handler.ignorableWhitespace(arg0, arg1, arg2);
97     }
98
99     /**
100      * @param arg0
101      * @param arg1
102      * @throws org.xml.sax.SAXException
103      */
104     public void processingInstruction(String JavaDoc arg0, String JavaDoc arg1)
105         throws SAXException JavaDoc {
106         handler.processingInstruction(arg0, arg1);
107     }
108
109     /**
110      * @param arg0
111      */
112     public void setDocumentLocator(Locator JavaDoc arg0) {
113         handler.setDocumentLocator(arg0);
114     }
115
116     /**
117      * @param arg0
118      * @throws org.xml.sax.SAXException
119      */
120     public void skippedEntity(String JavaDoc arg0) throws SAXException JavaDoc {
121         handler.skippedEntity(arg0);
122     }
123
124     /**
125      * @param arg0
126      * @param arg1
127      * @param arg2
128      * @param arg3
129      * @throws org.xml.sax.SAXException
130      */
131     public void startElement(
132         String JavaDoc arg0,
133         String JavaDoc arg1,
134         String JavaDoc arg2,
135         Attributes JavaDoc arg3)
136         throws SAXException JavaDoc {
137         handler.startElement(arg0, arg1, arg2, arg3);
138     }
139
140     /**
141      * @param arg0
142      * @param arg1
143      * @throws org.xml.sax.SAXException
144      */
145     public void startPrefixMapping(String JavaDoc arg0, String JavaDoc arg1)
146         throws SAXException JavaDoc {
147         handler.startPrefixMapping(arg0, arg1);
148     }
149 }
150
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