/*******************************************************************************
 * Copyright (c) 2010 Oracle.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution. 
 * The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 * and the Apache License v2.0 is available at 
 *     http://www.opensource.org/licenses/apache2.0.php.
 * You may elect to redistribute this code under either of these licenses.
 *
 * Contributors:
 *     Hal Hildebrand - Initial JMX support 
 ******************************************************************************/

package org.eclipse.gemini.mgmt.internal;

import java.util.ArrayList;
import java.util.List;

import org.osgi.framework.Bundle;
import org.osgi.framework.Constants;
import org.osgi.framework.startlevel.BundleStartLevel;
import org.osgi.framework.wiring.BundleRevision;
import org.osgi.framework.wiring.BundleWire;
import org.osgi.framework.wiring.BundleWiring;

/**
 * Static utilities
 * 
 */
public final class BundleUtil {
	
	/**
	 * Answer the string representation of the exported packages of the bundle
	 * 
	 * @param b
	 * @param admin
	 * @return the string representation of the exported packages of the bundle
	 */
	public static String[] getBundleExportedPackages(Bundle bundle) {
		BundleWiring wiring = bundle.adapt(BundleWiring.class);
		List<BundleWire> providedWires = wiring.getProvidedWires(BundleRevision.PACKAGE_NAMESPACE);
		List<String> packages = new ArrayList<String>();
        for(BundleWire wire: providedWires){
        	String packageName = String.format("%s;%s", wire.getCapability().getAttributes().get(BundleRevision.PACKAGE_NAMESPACE), wire.getCapability().getAttributes().get(Constants.VERSION_ATTRIBUTE));
        	if(!packages.contains(packageName)){
        		packages.add(packageName);
        	}
        }
        return packages.toArray(new String[packages.size()]);
	}

	/**
	 * Answer the string representation of the packages imported by a bundle
	 * 
	 * @param b
	 * @param bundleContext
	 * @param admin
	 * @return the string representation of the packages imported by a bundle
	 */
	public static String[] getBundleImportedPackages(Bundle bundle) {
		BundleWiring wiring = bundle.adapt(BundleWiring.class);
		List<BundleWire> providedWires = wiring.getRequiredWires(BundleRevision.PACKAGE_NAMESPACE);
        List<String> packages = new ArrayList<String>();
        for(BundleWire wire: providedWires){
            String packageName = String.format("%s;%s", wire.getCapability().getAttributes().get(BundleRevision.PACKAGE_NAMESPACE), wire.getCapability().getAttributes().get(Constants.VERSION_ATTRIBUTE));
            if(!packages.contains(packageName)){
                packages.add(packageName);
            }
        }
        return packages.toArray(new String[packages.size()]);
	}

	/**
	 * Answer the string representation of the bundle state
	 * 
	 * @param b
	 * @return the string representation of the bundle state
	 */
	public static String getBundleState(Bundle b) {
		switch (b.getState()) {
			case Bundle.ACTIVE:
				return "ACTIVE";
			case Bundle.INSTALLED:
				return "INSTALLED";
			case Bundle.RESOLVED:
				return "RESOLVED";
			case Bundle.STARTING:
				return "STARTING";
			case Bundle.STOPPING:
				return "STOPPING";
			case Bundle.UNINSTALLED:
				return "UNINSTALLED";
			default:
				return "UNKNOWN";
		}
	}

	/**
	 * Answer true if the bundle is a fragment
	 * 
	 * @param bundle
	 * @param admin
	 * @return true if the bundle is a fragment
	 */
	public static boolean isBundleFragment(Bundle bundle) {
		BundleWiring wiring = bundle.adapt(BundleWiring.class);
		return 0 != (wiring.getRevision().getTypes() & BundleRevision.TYPE_FRAGMENT);
	}

	/**
	 * Return the start level for the given bundle
	 * 
	 * @param bundle
	 * @return
	 */
	public static int getBundleStartLevel(Bundle bundle) {
		BundleStartLevel startLevel = bundle.adapt(BundleStartLevel.class);
		return startLevel.getStartLevel();
	}
	
	/**
	 * Answer true if the bundle has been persitently started
	 * 
	 * @param bundle
	 * @param sl
	 * @return true if the bundle has been persitently started
	 */
	public static boolean isBundlePersistentlyStarted(Bundle bundle) {
		BundleStartLevel startLevel = bundle.adapt(BundleStartLevel.class);
		return startLevel.isPersistentlyStarted();
	}
	
	/**
	 * Answer true if the bundle has been persitently started
	 * 
	 * @param bundle
	 * @param sl
	 * @return true if the bundle has been persitently started
	 */
	public static boolean isBundleActivationPolicyUsed(Bundle bundle) {
		BundleStartLevel startLevel = bundle.adapt(BundleStartLevel.class);
		return startLevel.isActivationPolicyUsed();
	}

	/**
	 * Answer true if the bundle is required
	 * 
	 * @param bundle
	 * @param bc
	 * @return true if the bundle is required
	 */
	public static boolean isRequired(Bundle bundle) {
		BundleWiring wiring = bundle.adapt(BundleWiring.class);
		return wiring.getProvidedWires(BundleRevision.BUNDLE_NAMESPACE).size() > 0;
	}

	/**
	 * Answer true if the bundle is pending removal
	 * 
	 * @param bundle
	 * @param bc
	 * @return true if the bundle is pending removal
	 */
	public static boolean isRemovalPending(Bundle bundle) {
        BundleWiring wiring = bundle.adapt(BundleWiring.class);
        return (!wiring.isCurrent()) && wiring.isInUse();
	}

}