com.openteach.diamond.osgi.Activator.java Source code

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Here is the source code for com.openteach.diamond.osgi.Activator.java

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/**
 * Copyright 2013 openteach
 *
 *  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 com.openteach.diamond.osgi;

import java.io.File;
import java.net.MalformedURLException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.osgi.framework.internal.core.AbstractBundle;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.Version;

import com.openteach.diamond.common.Constants;
import com.openteach.diamond.common.exception.DiamondException;

/**
 * 
 * @author sihai
 *
 */
public class Activator implements BundleActivator {

    private static final Log logger = LogFactory.getLog(Activator.class);

    private static BundleContext bundleContext;

    public void start(BundleContext context) throws Exception {
        Activator.bundleContext = context;
    }

    public void stop(BundleContext context) throws Exception {
        if (bundleContext == context) {
            bundleContext = null;
        }
    }

    public static boolean isBundleExist(String symbolicName) {
        if (bundleContext != null) {
            Bundle[] bundles = bundleContext.getBundles();
            if (bundles != null) {
                for (Bundle bundle : bundles) {
                    if (symbolicName.equals(bundle.getSymbolicName())) {
                        return true;
                    }
                }
                return false;
            }
        }
        return false;
    }

    private static void installAndStartBundle(String location) throws DiamondException {
        if (bundleContext != null) {
            try {
                Bundle bundle = bundleContext.installBundle(location);
                bundle.start();
            } catch (BundleException e) {
                throw new DiamondException(e);
            }
        }
    }

    /**
     * 
     * @return current bundle version
     */
    private static String getCurrentBundleVersion() {
        Bundle bundle = bundleContext.getBundle();
        if (bundle instanceof AbstractBundle) {
            AbstractBundle aBundle = (AbstractBundle) bundle;
            Version version = aBundle.getVersion();
            if (version != null) {
                return version.toString();
            }
        }
        return Constants.CURRENT_VERSION;
    }

    public static void downloadAndInstallBundle(String bundleName) throws DiamondException {
        String version = getCurrentBundleVersion();
        String bundle = bundleName + "-" + version + ".jar.plugin";
        String containerPath = System.getProperty("HSF.CONTAINER.PATH");
        String outputDir = containerPath + File.separator + "plugins" + File.separator + "extra";
        try {
            BundleDownloader.download(bundle, outputDir);
        } catch (DiamondException e) {
            throw new DiamondException(String.format("bundle:%s, :", bundle), e);
        }
        try {
            File f = new File(outputDir, bundle);
            installAndStartBundle(f.toURI().toURL().toExternalForm());
        } catch (DiamondException e) {
            throw new DiamondException("bundle, ", e);
        } catch (MalformedURLException e) {
            throw new DiamondException("bundle, ", e);
        }
    }
}