VersionDescriptor.java

/*
 * DBeaver - Universal Database Manager
 * Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
 *
 * 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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */

package org.jkiss.dbeaver.registry.updater;

import org.jkiss.dbeaver.runtime.WebUtils;
import org.jkiss.utils.xml.SAXListener;
import org.jkiss.utils.xml.SAXReader;
import org.jkiss.utils.xml.XMLException;
import org.osgi.framework.Version;
import org.xml.sax.Attributes;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Version descriptor
 */
public class VersionDescriptor {

    private String programName;
    private Version programVersion;
    private String updateTime;
    private String baseURL;
    private String releaseNotes;

    private final List<DistributionDescriptor> distributions = new ArrayList<>();
    private final List<UpdateSiteDescriptor> updateSites = new ArrayList<>();

    public VersionDescriptor(String fileAddr)
        throws IOException
    {
        try (InputStream inputStream = WebUtils.openConnection(fileAddr).getInputStream()) {
            parseVersionInfo(inputStream);
        } catch (XMLException e) {
            throw new IOException("XML parse error", e);
        }
    }

    public String getProgramName()
    {
        return programName;
    }

    public Version getProgramVersion()
    {
        return programVersion;
    }

    public String getUpdateTime()
    {
        return updateTime;
    }

    public String getBaseURL()
    {
        return baseURL;
    }

    public String getReleaseNotes()
    {
        return releaseNotes;
    }

    public Collection<DistributionDescriptor> getDistributions()
    {
        return distributions;
    }

    public Collection<UpdateSiteDescriptor> getUpdateSites()
    {
        return updateSites;
    }

    private void parseVersionInfo(InputStream inputStream) throws IOException, XMLException {
        SAXReader parser = new SAXReader(inputStream);
        SAXListener dsp = new SAXListener() {
            private String lastTag;
            private StringBuilder textBuffer = new StringBuilder();
            @Override
            public void saxStartElement(SAXReader reader, String namespaceURI, String localName, Attributes atts) throws XMLException {
                lastTag = localName;
                textBuffer.setLength(0);
            }
            @Override
            public void saxText(SAXReader reader, String data) throws XMLException {
                textBuffer.append(data);
            }
            @Override
            public void saxEndElement(SAXReader reader, String namespaceURI, String localName) throws XMLException {
                final String text = textBuffer.toString();
                switch (lastTag) {
                    case "name": programName = text; break;
                    case "number": programVersion = Version.parseVersion(text); break;
                    case "date": updateTime = text; break;
                    case "base-url": baseURL = text; break;
                    case "release-notes": releaseNotes = text; break;
                }
                textBuffer.setLength(0);
            }
        };
        parser.parse(dsp);
    }

}