ChangelogInfoParser.java

/**
 * Copyright 2012-2013 Maciej Jaworski, Mariusz Kapcia, Paweł Kędzia, Mateusz Kubuszok
 *
 * <p>Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at</p> 
 * 
 * <p>http://www.apache.org/licenses/LICENSE-2.0</p>
 *
 * <p>Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.</p>
 */
package com.autoupdater.client.xml.parsers;

import static net.jsdpu.logger.Logger.getLogger;

import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;

import net.jsdpu.logger.Logger;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;

import com.autoupdater.client.models.ChangelogEntry;
import com.autoupdater.client.models.ChangelogEntryBuilder;
import com.autoupdater.client.xml.schema.ChangelogInfoSchema;

/**
 * Implementation parsing incoming XML data into Changelog.
 */
public class ChangelogInfoParser extends AbstractXMLParser<SortedSet<ChangelogEntry>> {
    private static final Logger logger = getLogger(ChangelogInfoParser.class);

    @Override
    SortedSet<ChangelogEntry> parseDocument(Document document) throws ParserException {
        logger.trace("Parsing changelog info data");
        try {
            SortedSet<ChangelogEntry> changelogs = new TreeSet<ChangelogEntry>();

            List<? extends Node> changelogsNodes = document.selectNodes("./"
                    + ChangelogInfoSchema.Changelogs.changelog_);
            for (Node changelogNode : changelogsNodes) {
                String version = ((Element) changelogNode)
                        .attributeValue(ChangelogInfoSchema.Changelogs.version);
                String changelog = getContent((Element) changelogNode);
                changelogs.add(ChangelogEntryBuilder.builder().setDescription(changelog)
                        .setVersionNumber(version).build());
            }

            return changelogs;
        } catch (Exception e) {
            logger.error("Cannot parse changelog info data's document: " + e.getMessage()
                    + " (exception thrown)", e);
            throw new ParserException("Error occured while parsing response").addSuppresed(e,
                    ParserException.class);
        }
    }
}