package org.apache.maven.plugins.help;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.

  */

 import java.io.PrintWriter;

 import java.io.StringWriter;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import org.apache.maven.BuildFailureException;

 import org.apache.maven.execution.MavenSession;

 import org.apache.maven.lifecycle.DefaultLifecycleExecutor;

 import org.apache.maven.lifecycle.LifecycleExecutionException;

 import org.apache.maven.lifecycle.LifecycleExecutor;

 import org.apache.maven.plugin.MojoExecutionException;

 import org.apache.maven.plugin.MojoFailureException;

 import org.apache.maven.plugin.PluginNotFoundException;

 import org.apache.maven.plugin.descriptor.MojoDescriptor;

 import org.apache.maven.project.MavenProject;

 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

 /**

  * Utility methods to play with Help Mojos.

  *

  * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>

  * @version $Id: HelpUtil.java 689770 2008-08-28 09:47:18Z vsiveton $

  */

 public class HelpUtil

 {

     /**

      * Invoke the following private method <code>

      * DefaultLifecycleExecutor#getMojoDescriptor(String, MavenSession, MavenProject, String, boolean, boolean)</code>

      *

      * @param task not null

      * @param session not null

      * @param project not null

      * @param invokedVia not null

      * @param canUsePrefix not null

      * @param isOptionalMojo not null

      * @return MojoDescriptor for the task

      * @throws MojoFailureException if can not invoke the method.

      * @throws MojoExecutionException if no descriptor was found for <code>task</code>.

      * @see DefaultLifecycleExecutor#getMojoDescriptor(String, MavenSession, MavenProject, String, boolean, boolean)

      */

     protected static MojoDescriptor getMojoDescriptor( String task, MavenSession session, MavenProject project,

                                               String invokedVia, boolean canUsePrefix, boolean isOptionalMojo )

         throws MojoFailureException, MojoExecutionException

     {

         try

         {

             DefaultLifecycleExecutor lifecycleExecutor =

                 (DefaultLifecycleExecutor) session.lookup( LifecycleExecutor.ROLE );

             Method m =

                 lifecycleExecutor.getClass().getDeclaredMethod(

                                                                 "getMojoDescriptor",

                                                                 new Class[] { String.class, MavenSession.class,

                                                                     MavenProject.class, String.class,

                                                                     Boolean.TYPE, Boolean.TYPE } );

             m.setAccessible( true );

             MojoDescriptor mojoDescriptor =

                 (MojoDescriptor) m.invoke( lifecycleExecutor, new Object[] { task, session, project, invokedVia,

                     Boolean.valueOf( canUsePrefix ), Boolean.valueOf( isOptionalMojo ) } );

             if ( mojoDescriptor == null )

             {

                 throw new MojoExecutionException( "No MOJO exists for '" + task + "'." );

             }

             return mojoDescriptor;

         }

         catch ( SecurityException e )

         {

             throw new MojoFailureException( "SecurityException: " + e.getMessage() );

         }

         catch ( IllegalArgumentException e )

         {

             throw new MojoFailureException( "IllegalArgumentException: " + e.getMessage() );

         }

         catch ( ComponentLookupException e )

         {

             throw new MojoFailureException( "ComponentLookupException: " + e.getMessage() );

         }

         catch ( NoSuchMethodException e )

         {

             throw new MojoFailureException( "NoSuchMethodException: " + e.getMessage() );

         }

         catch ( IllegalAccessException e )

         {

             throw new MojoFailureException( "IllegalAccessException: " + e.getMessage() );

         }

         catch ( InvocationTargetException e )

         {

             Throwable cause = e.getCause();

             if ( cause instanceof BuildFailureException )

             {

                 throw new MojoFailureException( "BuildFailureException: " + cause.getMessage() );

             }

             else if ( cause instanceof LifecycleExecutionException )

             {

                 throw new MojoFailureException( "LifecycleExecutionException: " + cause.getMessage() );

             }

             else if ( cause instanceof PluginNotFoundException )

             {

                 throw new MojoFailureException( "PluginNotFoundException: " + cause.getMessage() );

             }

             StringWriter s = new StringWriter();

             PrintWriter writer = new PrintWriter( s );

             e.printStackTrace( writer );

             throw new MojoFailureException( "InvocationTargetException: " + e.getMessage() + "\n" + s.toString() );

         }

     }

 }