001/*
002 *
003 * Copyright 2017 Paul Schaub
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.jingle_filetransfer.provider;
018
019import java.io.IOException;
020
021import org.jivesoftware.smack.packet.XmlEnvironment;
022import org.jivesoftware.smack.parsing.SmackParsingException;
023import org.jivesoftware.smack.provider.ExtensionElementProvider;
024import org.jivesoftware.smack.xml.XmlPullParser;
025import org.jivesoftware.smack.xml.XmlPullParserException;
026
027import org.jivesoftware.smackx.hashes.element.HashElement;
028import org.jivesoftware.smackx.hashes.provider.HashElementProvider;
029import org.jivesoftware.smackx.jingle.element.JingleContent;
030import org.jivesoftware.smackx.jingle_filetransfer.element.Checksum;
031import org.jivesoftware.smackx.jingle_filetransfer.element.JingleFileTransferChild;
032import org.jivesoftware.smackx.jingle_filetransfer.element.Range;
033
034import org.jxmpp.JxmppContext;
035
036/**
037 * Provider for the Checksum element.
038 */
039public class ChecksumProvider extends ExtensionElementProvider<Checksum> {
040    @Override
041    public Checksum parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment, JxmppContext jxmppContext) throws XmlPullParserException, IOException, SmackParsingException {
042        JingleContent.Creator creator = null;
043        String creatorString = parser.getAttributeValue(null, Checksum.ATTR_CREATOR);
044        if (creatorString != null) {
045            creator = JingleContent.Creator.valueOf(creatorString);
046        }
047        String name = parser.getAttributeValue(null, Checksum.ATTR_NAME);
048
049
050        JingleFileTransferChild.Builder cb = JingleFileTransferChild.getBuilder();
051        HashElement hashElement = null;
052        Range range = null;
053
054        boolean go = true;
055        while (go) {
056            XmlPullParser.TagEvent tag = parser.nextTag();
057            String n = parser.getText();
058
059            switch (tag) {
060            case START_ELEMENT:
061                switch (n) {
062                    case HashElement.ELEMENT:
063                        hashElement = new HashElementProvider().parse(parser);
064                        break;
065
066                    case Range.ELEMENT:
067                        String offset = parser.getAttributeValue(null, Range.ATTR_OFFSET);
068                        String length = parser.getAttributeValue(null, Range.ATTR_LENGTH);
069                        int o = offset == null ? 0 : Integer.parseInt(offset);
070                        int l = length == null ? -1 : Integer.parseInt(length);
071                        range = new Range(o, l);
072                }
073                break;
074            case END_ELEMENT:
075                switch (n) {
076                    case Range.ELEMENT:
077                        if (hashElement != null && range != null) {
078                            range = new Range(range.getOffset(), range.getLength(), hashElement);
079                            hashElement = null;
080                        }
081                        break;
082
083                    case JingleFileTransferChild.ELEMENT:
084                        if (hashElement != null) {
085                            cb.setHash(hashElement);
086                        }
087                        if (range != null) {
088                            cb.setRange(range);
089                        }
090                        go = false;
091                }
092                break;
093            }
094        }
095        return new Checksum(creator, name, cb.build());
096    }
097}