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/*******************************************************************************
 * Copyright (c) 2008, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.osgi.launch;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.*;
import java.util.*;
import org.eclipse.osgi.framework.internal.core.FrameworkProperties;
import org.osgi.framework.*;
import org.osgi.framework.launch.Framework;

/**
 * The System Bundle implementation for the Equinox Framework.
 * 
 * @since 3.5
 */
public class Equinox implements Framework {
  private static final String implName = "org.eclipse.osgi.framework.internal.core.EquinoxLauncher"; //$NON-NLS-1$
  /**@GuardedBy this*/
  private Framework impl;
  private final boolean useSeparateCL;
  private final Map configuration;

  public Equinox(Map configuration) {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null)
      sm.checkPermission(new AllPermission());
    useSeparateCL = FrameworkProperties.inUse();
    this.configuration = configuration;
  }

  private Framework createImpl() {
    if (System.getSecurityManager() == null)
      return createImpl0();
    return (Framework) AccessController.doPrivileged(new PrivilegedAction() {
      public Object run() {
        return createImpl0();
      }
    });
  }

  Framework createImpl0() {
    try {
      Class implClazz = getImplClass();
      Constructor constructor = implClazz.getConstructor(new Class[] {Map.class});
      return (Framework) constructor.newInstance(new Object[] {configuration});
    } catch (ClassNotFoundException e) {
      throw new NoClassDefFoundError(implName);
    } catch (IllegalAccessException e) {
      throw new RuntimeException(e.getMessage());
    } catch (NoSuchMethodException e) {
      throw new NoSuchMethodError(e.getMessage());
    } catch (InstantiationException e) {
      throw new RuntimeException(e.getMessage());
    } catch (InvocationTargetException e) {
      throw new RuntimeException(e.getMessage());
    }
  }

  private Class getImplClass() throws ClassNotFoundException {
    ClassLoader thisCL = this.getClass().getClassLoader();
    if (!(useSeparateCL && (thisCL instanceof URLClassLoader)))
      return Class.forName(implName);
    URL[] cp = ((URLClassLoader) thisCL).getURLs();
    EquinoxFWClassLoader fwCL = new EquinoxFWClassLoader(cp, thisCL);
    return fwCL.loadClass(implName);
  }

  private synchronized Framework getImpl() {
    if (impl == null)
      impl = createImpl();
    return impl;
  }

  public void init() throws BundleException {
    getImpl().init();
  }

  public FrameworkEvent waitForStop(long timeout) throws InterruptedException {
    return getImpl().waitForStop(timeout);
  }

  public Enumeration findEntries(String path, String filePattern, boolean recurse) {
    return getImpl().findEntries(path, filePattern, recurse);
  }

  public BundleContext getBundleContext() {
    return getImpl().getBundleContext();
  }

  public long getBundleId() {
    return getImpl().getBundleId();
  }

  public URL getEntry(String path) {
    return getImpl().getEntry(path);
  }

  public Enumeration getEntryPaths(String path) {
    return getImpl().getEntryPaths(path);
  }

  public Dictionary getHeaders() {
    return getImpl().getHeaders();
  }

  public Dictionary getHeaders(String locale) {
    return getImpl().getHeaders(locale);
  }

  public long getLastModified() {
    return getImpl().getLastModified();
  }

  public String getLocation() {
    return getImpl().getLocation();
  }

  public ServiceReference[] getRegisteredServices() {
    return getImpl().getRegisteredServices();
  }

  public URL getResource(String name) {
    return getImpl().getResource(name);
  }

  public Enumeration getResources(String name) throws IOException {
    return getImpl().getResources(name);
  }

  public ServiceReference[] getServicesInUse() {
    return getImpl().getServicesInUse();
  }

  public int getState() {
    return getImpl().getState();
  }

  public String getSymbolicName() {
    return getImpl().getSymbolicName();
  }

  public boolean hasPermission(Object permission) {
    return getImpl().hasPermission(permission);
  }

  public Class loadClass(String name) throws ClassNotFoundException {
    return getImpl().loadClass(name);
  }

  public void start(int options) throws BundleException {
    getImpl().start(options);
  }

  public void start() throws BundleException {
    getImpl().start();
  }

  public void stop(int options) throws BundleException {
    getImpl().stop(options);
  }

  public void stop() throws BundleException {
    getImpl().stop();
  }

  public void uninstall() throws BundleException {
    getImpl().uninstall();
  }

  public void update() throws BundleException {
    getImpl().update();
  }

  public void update(InputStream in) throws BundleException {
    getImpl().update(in);
  }

  public Map getSignerCertificates(int signersType) {
    return getImpl().getSignerCertificates(signersType);
  }

  public Version getVersion() {
    return getImpl().getVersion();
  }
}
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