001/**
002 *
003 * Copyright © 2009 Jonas Ådahl, 2011-2019 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.packet.XmlEnvironment;
022import org.jivesoftware.smack.provider.ExtensionElementProvider;
023import org.jivesoftware.smack.xml.XmlPullParser;
024import org.jivesoftware.smack.xml.XmlPullParserException;
025
026import org.jivesoftware.smackx.caps.EntityCapsManager;
027import org.jivesoftware.smackx.caps.packet.CapsExtension;
028
029public class CapsExtensionProvider extends ExtensionElementProvider<CapsExtension> {
030
031    @Override
032    public CapsExtension parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment) throws XmlPullParserException, IOException {
033        String hash, version, node;
034        if (parser.getEventType() == XmlPullParser.Event.START_ELEMENT
035                && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT)) {
036            hash = parser.getAttributeValue(null, "hash");
037            version = parser.getAttributeValue(null, "ver");
038            node = parser.getAttributeValue(null, "node");
039        } else {
040            // TODO: Should be SmackParsingException.
041            throw new IOException("Malformed Caps element");
042        }
043
044        parser.next();
045
046        if (!(parser.getEventType() == XmlPullParser.Event.END_ELEMENT
047                && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT))) {
048            // TODO: Should be SmackParsingException.
049            throw new IOException("Malformed nested Caps element");
050        }
051
052        if (hash != null && version != null && node != null) {
053            return new CapsExtension(node, version, hash);
054        } else {
055            // TODO: Should be SmackParsingException.
056            throw new IOException("Caps element with missing attributes. Attributes: hash=" + hash + " version="
057                            + version + " node=" + node);
058        }
059    }
060
061}