001/**
002 *
003 * Copyright © 2009 Jonas Ådahl, 2011-2014 Florian Schmaus
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.caps.provider;
018
019import java.io.IOException;
020
021import org.jivesoftware.smack.SmackException;
022import org.jivesoftware.smack.packet.PacketExtension;
023import org.jivesoftware.smack.provider.PacketExtensionProvider;
024import org.jivesoftware.smackx.caps.EntityCapsManager;
025import org.jivesoftware.smackx.caps.packet.CapsExtension;
026import org.xmlpull.v1.XmlPullParser;
027import org.xmlpull.v1.XmlPullParserException;
028
029public class CapsExtensionProvider implements PacketExtensionProvider {
030
031    public PacketExtension parseExtension(XmlPullParser parser) throws XmlPullParserException, IOException,
032            SmackException {
033        String hash = null;
034        String version = null;
035        String node = null;
036        if (parser.getEventType() == XmlPullParser.START_TAG
037                && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT)) {
038            hash = parser.getAttributeValue(null, "hash");
039            version = parser.getAttributeValue(null, "ver");
040            node = parser.getAttributeValue(null, "node");
041        } else {
042            throw new SmackException("Malformed Caps element");
043        }
044
045        parser.next();
046
047        if (!(parser.getEventType() == XmlPullParser.END_TAG
048                && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT))) {
049            throw new SmackException("Malformed nested Caps element");
050        }
051
052        if (hash != null && version != null && node != null) {
053            return new CapsExtension(node, version, hash);
054        } else {
055            throw new SmackException("Caps elment with missing attributes");
056        }
057    }
058}