org.colombbus.tangara.update.UpdateRequester.java Source code

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Here is the source code for org.colombbus.tangara.update.UpdateRequester.java

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/**
 * Tangara is an educational platform to get started with programming.
 * Copyright (C) 2009-2012 Colombbus (http://www.colombbus.org)
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 org.colombbus.tangara.update;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.Properties;

import org.apache.commons.lang.Validate;
import org.colombbus.tangara.core.Version;

class UpdateRequester {

    private URL updateSite;

    public void setUpdateSite(String site) throws MalformedURLException {
        Validate.notNull(site, "site argument is null");//$NON-NLS-1$
        URI updateSiteURI = URI.create(site + "/update.properties");//$NON-NLS-1$
        this.updateSite = updateSiteURI.toURL();
    }

    public SoftwareUpdateInfo requestSoftwareInfo() throws IOException {
        URLConnection connect = updateSite.openConnection();

        Properties updateProp = new Properties();
        updateProp.load(connect.getInputStream());

        SoftwareUpdateInfo softwareInfo = extractSoftwareInfo(updateProp);
        return softwareInfo;
    }

    private static SoftwareUpdateInfo extractSoftwareInfo(Properties updateProp) {
        SoftwareUpdateInfo info = new SoftwareUpdateInfo();

        String versionTxt = updateProp.getProperty("version"); //$NON-NLS-1$
        Version version = new Version(versionTxt);
        info.setVersion(version);

        String link = updateProp.getProperty("link"); //$NON-NLS-1$
        info.setLink(link);

        String description = updateProp.getProperty("description"); //$NON-NLS-1$
        info.setDescription(description);

        return info;
    }

}