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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      */
     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      */
     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