001/**
002 *
003 * Copyright the original author or authors
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smackx.pubsub.provider;
018
019import java.io.IOException;
020
021import org.jivesoftware.smack.packet.IQ;
022import org.jivesoftware.smack.packet.XmlEnvironment;
023import org.jivesoftware.smack.parsing.SmackParsingException;
024import org.jivesoftware.smack.provider.IQProvider;
025import org.jivesoftware.smack.util.PacketParserUtils;
026import org.jivesoftware.smack.xml.XmlPullParser;
027import org.jivesoftware.smack.xml.XmlPullParserException;
028
029import org.jivesoftware.smackx.pubsub.packet.PubSub;
030import org.jivesoftware.smackx.pubsub.packet.PubSubNamespace;
031
032/**
033 * Parses the root PubSub stanza extensions of the {@link IQ} stanza and returns
034 * a {@link PubSub} instance.
035 *
036 * @author Robin Collier
037 */
038public class PubSubProvider extends IQProvider<PubSub> {
039    @Override
040    public PubSub parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment) throws XmlPullParserException, IOException, SmackParsingException {
041        String namespace = parser.getNamespace();
042        PubSubNamespace pubSubNamespace = PubSubNamespace.valueOfFromXmlns(namespace);
043        PubSub pubsub = new PubSub(pubSubNamespace);
044
045        outerloop: while (true)  {
046            XmlPullParser.Event eventType = parser.next();
047            switch (eventType) {
048            case START_ELEMENT:
049                PacketParserUtils.addExtensionElement(pubsub, parser, xmlEnvironment);
050                break;
051            case END_ELEMENT:
052                if (parser.getDepth() == initialDepth) {
053                    break outerloop;
054                }
055                break;
056            default:
057                // Catch all for incomplete switch (MissingCasesInEnumSwitch) statement.
058                break;
059            }
060        }
061        return pubsub;
062    }
063}