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1 /**
2  * $RCSfile$
3  * $Revision$
4  * $Date$
5  *
6  * Copyright 2003-2007 Jive Software.
7  *
8  * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
9  * you may not use this file except in compliance with the License.
10  * You may obtain a copy of the License at
11  *
12  *     http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 
21 package org.jivesoftware.smackx.provider;
22 
23 import org.jivesoftware.smack.packet.PacketExtension;
24 import org.jivesoftware.smack.provider.PacketExtensionProvider;
25 import org.jivesoftware.smack.util.StringUtils;
26 import org.jivesoftware.smackx.packet.XHTMLExtension;
27 import org.xmlpull.v1.XmlPullParser;
28 
29 /**
30  * The XHTMLExtensionProvider parses XHTML packets.
31  *
32  * @author Gaston Dombiak
33  */
34 public class XHTMLExtensionProvider implements PacketExtensionProvider {
35 
36     /**
37      * Creates a new XHTMLExtensionProvider.
38      * ProviderManager requires that every PacketExtensionProvider has a public, no-argument constructor
39      */
XHTMLExtensionProvider()40     public XHTMLExtensionProvider() {
41     }
42 
43     /**
44      * Parses a XHTMLExtension packet (extension sub-packet).
45      *
46      * @param parser the XML parser, positioned at the starting element of the extension.
47      * @return a PacketExtension.
48      * @throws Exception if a parsing error occurs.
49      */
parseExtension(XmlPullParser parser)50     public PacketExtension parseExtension(XmlPullParser parser)
51         throws Exception {
52         XHTMLExtension xhtmlExtension = new XHTMLExtension();
53         boolean done = false;
54         StringBuilder buffer = new StringBuilder();
55         int startDepth = parser.getDepth();
56         int depth = parser.getDepth();
57         String lastTag = "";
58         while (!done) {
59             int eventType = parser.next();
60             if (eventType == XmlPullParser.START_TAG) {
61                 if (parser.getName().equals("body")) {
62                     buffer = new StringBuilder();
63                     depth = parser.getDepth();
64                 }
65                 lastTag = parser.getText();
66                 buffer.append(parser.getText());
67             } else if (eventType == XmlPullParser.TEXT) {
68                 if (buffer != null) {
69                     // We need to return valid XML so any inner text needs to be re-escaped
70                     buffer.append(StringUtils.escapeForXML(parser.getText()));
71                 }
72             } else if (eventType == XmlPullParser.END_TAG) {
73                 if (parser.getName().equals("body") && parser.getDepth() <= depth) {
74                     buffer.append(parser.getText());
75                     xhtmlExtension.addBody(buffer.toString());
76                 }
77                 else if (parser.getName().equals(xhtmlExtension.getElementName())
78                         && parser.getDepth() <= startDepth) {
79                     done = true;
80                 }
81                 else {
82                     // This is a check for tags that are both a start and end tag like <br/>
83                     // So that they aren't doubled
84                     if(lastTag == null || !lastTag.equals(parser.getText())) {
85                         buffer.append(parser.getText());
86                     }
87                 }
88             }
89         }
90 
91         return xhtmlExtension;
92     }
93 
94 }
95