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/***************************************************************************
 * Copyright (c) 2004, 2005, 2006 Eike Stepper, Germany.
 * 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:
 *    Eike Stepper - initial API and implementation
 **************************************************************************/
package org.eclipse.net4j.util.lifecycle;

import org.eclipse.net4j.util.om.trace.ContextTracer;

import org.eclipse.internal.net4j.bundle.Net4j;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

/**
 * @author Eike Stepper
 */
public final class LifecycleUtil
{
  private static final ContextTracer TRACER = new ContextTracer(Net4j.DEBUG_LIFECYCLE,
      LifecycleUtil.class);

  private LifecycleUtil()
  {
  }

  public static boolean isActive(Object object)
  {
    if (object instanceof Lifecycle.Introspection)
    {
      return ((Lifecycle.Introspection)object).isActive();
    }

    return true;
  }

  public static void activate(Object object) throws Exception
  {
    activate(object, false);
  }

  /**
   * @see Activator
   */
  public static void activate(Object object, boolean useAnnotation) throws Exception
  {
    if (object instanceof Lifecycle)
    {
      ((Lifecycle)object).activate();
    }
    else if (useAnnotation)
    {
      invokeAnnotation(object, Activator.class);
    }
  }

  public static Exception activateSilent(Object object)
  {
    return activateSilent(object, false);
  }

  /**
   * @see Activator
   */
  public static Exception activateSilent(Object object, boolean useAnnotation)
  {
    try
    {
      activate(object, useAnnotation);
      return null;
    }
    catch (Exception ex)
    {
      return ex;
    }
  }

  public static Exception deactivate(Object object)
  {
    return deactivate(object, false);
  }

  /**
   * @see Deactivator
   */
  public static Exception deactivate(Object object, boolean useAnnotation)
  {
    if (object instanceof Lifecycle)
    {
      return ((Lifecycle)object).deactivate();
    }
    else if (useAnnotation)
    {
      invokeAnnotation(object, Deactivator.class);
    }

    return null;
  }

  public static void deactivateNoisy(Object object) throws Exception
  {
    deactivateNoisy(object, false);
  }

  public static void deactivateNoisy(Object object, boolean useAnnotation) throws Exception
  {
    Exception ex = deactivate(object, useAnnotation);
    if (ex != null)
    {
      throw ex;
    }
  }

  private static void invokeAnnotation(Object object, Class annotationClass)
  {
    Class c = object.getClass();
    while (c != Object.class)
    {
      final Method[] methods = c.getDeclaredMethods();
      for (Method method : methods)
      {
        if (method.getParameterTypes().length == 0)
        {
          Annotation annotation = method.getAnnotation(annotationClass);
          if (annotation != null)
          {
            invokeMethod(object, method);
            boolean propagate = annotationClass == Activator.class ? ((Activator)annotation)
                .propagate() : ((Deactivator)annotation).propagate();
            if (!propagate)
            {
              break;
            }
          }
        }
      }

      c = c.getSuperclass();
    }
  }

  private static Object invokeMethod(Object object, Method method)
  {
    try
    {
      return method.invoke(object, (Object[])null);
    }
    catch (IllegalAccessException iae)
    {
      try
      {
        method.setAccessible(true);
        return method.invoke(object, (Object[])null);
      }
      catch (Exception ex)
      {
        if (TRACER.isEnabled())
        {
          TRACER.trace(ex);
        }
      }
    }
    catch (Exception ex)
    {
      if (TRACER.isEnabled())
      {
        TRACER.trace(ex);
      }
    }

    return null;
  }
}

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