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Code Issues Releases Wiki Activity

Support for parsing embedded extensions from the server

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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@11349 b35dd754-fafc-0310-a699-88a17e54d16e
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rcollier 2009-10-28 22:46:47 +00:00
parent 7d50098c1c
commit c00e7e333d
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source/org/jivesoftware/smackx/provider/EmbeddedExtensionProvider.java Normal file
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/**
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.provider;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smackx.pubsub.provider.ItemProvider;
import org.jivesoftware.smackx.pubsub.provider.ItemsProvider;
import org.xmlpull.v1.XmlPullParser;
/**
*
* This class simplifies parsing of embedded elements by using the
* <a href="http://en.wikipedia.org/wiki/Template_method_pattern">Template Method Pattern</a>.
* After extracting the current element attributes and content of any child elements, the template method
* ({@link #createReturnExtension(String, String, Map, List)} is called. Subclasses
* then override this method to create the specific return type.
*
* <p>To use this class, you simply register your subclasses as extension providers in the
* <b>smack.properties</b> file. Then they will be automatically picked up and used to parse
* any child elements.
*
* <pre>
* For example, given the following message
*
* &lt;message from='pubsub.shakespeare.lit' to='francisco@denmark.lit' id='foo&gt;
* &lt;event xmlns='http://jabber.org/protocol/pubsub#event&gt;
* &lt;items node='princely_musings'&gt;
* &lt;item id='asdjkwei3i34234n356'&gt;
* &lt;entry xmlns='http://www.w3.org/2005/Atom'&gt;
* &lt;title&gt;Soliloquy&lt;/title&gt;
* &lt;link rel='alternative' type='text/html'/&gt;
* &lt;id>tag:denmark.lit,2003:entry-32397&lt;/id&gt;
* &lt;/entry&gt;
* &lt;/item&gt;
* &lt;/items&gt;
* &lt;/event&gt;
* &lt;/message&gt;
*
* I would have a classes
* {@link ItemsProvider} extends {@link EmbeddedExtensionProvider}
* {@link ItemProvider} extends {@link EmbeddedExtensionProvider}
* and
* AtomProvider extends {@link PacketExtensionProvider}
*
* These classes are then registered in the meta-inf/smack.providers file
* as follows.
*
* &lt;extensionProvider&gt;
* &lt;elementName&gt;items&lt;/elementName&gt;
* &lt;namespace&gt;http://jabber.org/protocol/pubsub#event&lt;/namespace&gt;
* &lt;className&gt;org.jivesoftware.smackx.provider.ItemsEventProvider&lt;/className&gt;
* &lt;/extensionProvider&gt;
* &lt;extensionProvider&gt;
* &lt;elementName&gt;item&lt;/elementName&gt;
* &lt;namespace&gt;http://jabber.org/protocol/pubsub#event&lt;/namespace&gt;
* &lt;className&gt;org.jivesoftware.smackx.provider.ItemProvider&lt;/className&gt;
* &lt;/extensionProvider&gt;
*
* </pre>
*
* @author Robin Collier
*/
abstract public class EmbeddedExtensionProvider implements PacketExtensionProvider
{
final public PacketExtension parseExtension(XmlPullParser parser) throws Exception
{
String namespace = parser.getNamespace();
String name = parser.getName();
Map<String, String> attMap = new HashMap<String, String>();
for(int i=0; i<parser.getAttributeCount(); i++)
{
attMap.put(parser.getAttributeName(i), parser.getAttributeValue(i));
}
List<PacketExtension> extensions = new ArrayList<PacketExtension>();
do
{
int tag = parser.next();
if (tag == XmlPullParser.START_TAG)
extensions.add(PacketParserUtils.parsePacketExtension(parser.getName(), parser.getNamespace(), parser));
} while (!name.equals(parser.getName()));
return createReturnExtension(name, namespace, attMap, extensions);
}
abstract protected PacketExtension createReturnExtension(String currentElement, String currentNamespace, Map<String, String> attributeMap, List<? extends PacketExtension> content);
}