001/**
002 *
003 * Copyright 2003-2005 Jive Software.
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.jingleold.provider;
018
019import java.io.IOException;
020
021import org.jivesoftware.smack.SmackException;
022import org.jivesoftware.smack.provider.ExtensionElementProvider;
023import org.jivesoftware.smackx.jingleold.media.PayloadType;
024import org.jivesoftware.smackx.jingleold.packet.JingleDescription;
025import org.xmlpull.v1.XmlPullParser;
026import org.xmlpull.v1.XmlPullParserException;
027
028/**
029 * Parser for a Jingle description
030 * 
031 * @author Alvaro Saurin <alvaro.saurin@gmail.com>
032 */
033public abstract class JingleDescriptionProvider extends ExtensionElementProvider<JingleDescription> {
034
035    /**
036     * Parse a iq/jingle/description/payload-type element.
037     * 
038     * @param parser
039     *            the input to parse
040     * @return a payload type element
041     */
042    protected PayloadType parsePayload(final XmlPullParser parser) {
043        int ptId = 0;
044        String ptName;
045        int ptChannels = 0;
046
047        try {
048            ptId = Integer.parseInt(parser.getAttributeValue("", "id"));
049        } catch (Exception e) {
050        }
051
052        ptName = parser.getAttributeValue("", "name");
053
054        try {
055            ptChannels = Integer.parseInt(parser.getAttributeValue("", "channels"));
056        } catch (Exception e) {
057        }
058
059        return new PayloadType(ptId, ptName, ptChannels);
060    }
061
062    /**
063     * Parse a iq/jingle/description element.
064     * 
065     * @param parser
066     *            the input to parse
067     * @return a description element
068     * @throws SmackException 
069     * @throws IOException 
070     * @throws XmlPullParserException 
071     */
072    public JingleDescription parse(XmlPullParser parser, int initialDepth) throws SmackException, XmlPullParserException, IOException {
073        boolean done = false;
074        JingleDescription desc = getInstance();
075
076        while (!done) {
077            int eventType = parser.next();
078            String name = parser.getName();
079
080            if (eventType == XmlPullParser.START_TAG) {
081                if (name.equals(PayloadType.NODENAME)) {
082                    desc.addPayloadType(parsePayload(parser));
083                } else {
084                    throw new SmackException("Unknow element \"" + name + "\" in content.");
085                }
086            } else if (eventType == XmlPullParser.END_TAG) {
087                if (name.equals(JingleDescription.NODENAME)) {
088                    done = true;
089                }
090            }
091        }
092        return desc;
093    }
094
095    /**
096     * Return a new instance of this class. Subclasses must overwrite this
097     * method.
098     */
099    protected abstract JingleDescription getInstance();
100
101    /**
102     * Jingle audio
103     */
104    public static class Audio extends JingleDescriptionProvider {
105
106        /**
107         * Parse an audio payload type.
108         */
109        public PayloadType parsePayload(final XmlPullParser parser) {
110            PayloadType pte = super.parsePayload(parser);
111            PayloadType.Audio pt = new PayloadType.Audio(pte);
112            int ptClockRate = 0;
113
114            try {
115                ptClockRate = Integer.parseInt(parser.getAttributeValue("", "clockrate"));
116            } catch (Exception e) {
117            }
118            pt.setClockRate(ptClockRate);
119
120            return pt;
121        }
122
123        /**
124         * Get a new instance of this object.
125         */
126        protected JingleDescription getInstance() {
127            return new JingleDescription.Audio();
128        }
129    }
130}