com.notifier.desktop.update.impl.UpdateManagerImpl.java Source code

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Here is the source code for com.notifier.desktop.update.impl.UpdateManagerImpl.java

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/*
 * Android Notifier Desktop is a multiplatform remote notification client for Android devices.
 *
 * Copyright (C) 2010  Leandro Aparecido
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.notifier.desktop.update.impl;

import java.io.*;
import java.net.*;
import java.util.*;

import org.htmlparser.*;
import org.htmlparser.filters.*;
import org.htmlparser.util.*;

import com.google.common.base.*;
import com.google.common.io.*;
import com.google.inject.*;
import com.notifier.desktop.*;
import com.notifier.desktop.update.*;

@Singleton
public class UpdateManagerImpl implements UpdateManager {

    private static final String POM_PROPERTIES_NAME = "/META-INF/maven/com.notifier.android-notifier-desktop/android-notifier-desktop/pom.properties";
    private static final String POM_VERSION_PROPERTY = "version";
    private static final URI TAGS_URI = URI.create("http://android-notifier.googlecode.com/svn/branches/");

    private Version latestVersion;

    @Override
    public boolean isLatestVersion() throws IOException {
        Version current = getCurrentVersion();
        latestVersion = getLatestVersion();

        return latestVersion == null || current.compareTo(latestVersion) >= 0;
    }

    public Version getCurrentVersion() throws IOException {
        InputStream is = getClass().getResourceAsStream(POM_PROPERTIES_NAME);
        if (is == null) {
            return Version.DEV;
        }
        Properties pom = new Properties();
        try {
            pom.load(is);
        } finally {
            Closeables.closeQuietly(is);
        }
        return Version.parse(pom.getProperty(POM_VERSION_PROPERTY));
    }

    public Version getLatestVersion() throws IOException {
        try {
            System.setProperty("java.net.useSystemProxies", Boolean.TRUE.toString());
            Parser parser = new Parser(TAGS_URI.toString());
            NodeList list = parser.parse(new TagNameFilter("li"));
            Version currentLatestVersion = null;
            for (int i = 0; i < list.size(); i++) {
                String value = Strings.nullToEmpty(list.elementAt(i).getFirstChild().getFirstChild().getText());
                if (value.startsWith(Application.ARTIFACT_ID)) {
                    int endIndex = value.endsWith("/") ? value.length() - 1 : value.length();
                    String versionString = value.substring(Application.ARTIFACT_ID.length() + 1, endIndex);
                    Version version = Version.parse(versionString);
                    if (currentLatestVersion == null || version.compareTo(currentLatestVersion) > 0) {
                        currentLatestVersion = version;
                    }
                }
            }
            latestVersion = currentLatestVersion;
            return currentLatestVersion;
        } catch (ParserException e) {
            throw new IOException("Could not parse tags page", e);
        }
    }

    @Override
    public Version getCachedLatestVersion() {
        return latestVersion;
    }
}