package org.apache.maven.plugin.clean;

 /*

  * 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 org.apache.maven.plugin.AbstractMojo;

 import org.apache.maven.plugin.MojoExecutionException;

 import java.io.File;

 import java.io.IOException;

 /**

  * Goal which cleans the build.

  *

  * <P>This attempts to clean a project's working directory of the files that

  * were generated at build-time. By default, it discovers and deletes the

  * directories configured in <code>project.build.directory</code>,

  * <code>project.build.outputDirectory</code>,

  * <code>project.build.testOutputDirectory</code>, and

  * <code>project.reporting.outputDirectory</code>. </P>

  *

  * <P>Files outside the default may also be included in the deletion by

  * configuring the <code>filesets</code> tag.</P>

  *

  * @author <a href="mailto:evenisse@maven.org">Emmanuel Venisse</a>

  * @version $Id$

  * @goal clean

  * @threadSafe

  * @since 2.0

  * @see org.apache.maven.plugin.clean.Fileset

  */

 public class CleanMojo

     extends AbstractMojo

 {

     /**

      * This is where build results go.

      *

      * @parameter default-value="${project.build.directory}"

      * @required

      * @readonly

      */

     private File directory;

     /**

      * This is where compiled classes go.

      *

      * @parameter default-value="${project.build.outputDirectory}"

      * @required

      * @readonly

      */

     private File outputDirectory;

     /**

      * This is where compiled test classes go.

      *

      * @parameter default-value="${project.build.testOutputDirectory}"

      * @required

      * @readonly

      */

     private File testOutputDirectory;

     /**

      * This is where the site plugin generates its pages.

      *

      * @parameter default-value="${project.reporting.outputDirectory}"

      * @required

      * @readonly

      * @since 2.1.1

      */

     private File reportDirectory;

     /**

      * Sets whether the plugin runs in verbose mode. As of plugin version 2.3, the default value is derived from Maven's

      * global debug flag (compare command line switch <code>-X</code>).

      * 

      * @parameter expression="${clean.verbose}"

      * @since 2.1

      */

     private Boolean verbose;

     /**

      * The list of file sets to delete, in addition to the default directories.

      *

      * @parameter

      * @since 2.1

      */

     private Fileset[] filesets;

     /**

      * Sets whether the plugin should follow symbolic links while deleting files from the default output directories of

      * the project. Not following symlinks requires more IO operations and heap memory, regardless whether symlinks are

      * actually present. So projects with a huge output directory that knowingly does not contain symlinks can improve

      * performance by setting this parameter to <code>true</code>.

      * 

      * @parameter expression="${clean.followSymLinks}" default-value="false"

      * @since 2.1

      */

     private boolean followSymLinks;

     /**

      * Disables the plugin execution.

      *

      * @parameter expression="${clean.skip}" default-value="false"

      * @since 2.2

      */

     private boolean skip;

     /**

      * Indicates whether the build will continue even if there are clean errors.

      *

      * @parameter expression="${maven.clean.failOnError}" default-value="true"

      * @since 2.2

      */

     private boolean failOnError;

     /**

      * Disables the deletion of the default output directories configured for a project. If set to <code>true</code>,

      * only the files/directories selected via the parameter {@link #filesets} will be deleted.

      * 

      * @parameter expression="${clean.excludeDefaultDirectories}" default-value="false"

      * @since 2.3

      */

     private boolean excludeDefaultDirectories;

     /**

      * Deletes file-sets in the following project build directory order: (source) directory, output directory, test

      * directory, report directory, and then the additional file-sets.

      * 

      * @see org.apache.maven.plugin.Mojo#execute()

      * @throws MojoExecutionException When a directory failed to get deleted.

      */

     public void execute()

         throws MojoExecutionException

     {

         if ( skip )

         {

             getLog().info( "Clean is skipped." );

             return;

         }

         Cleaner cleaner = new Cleaner( getLog(), isVerbose() );

         try

         {

             File[] directories = getDirectories();

             for ( int i = 0; i < directories.length; i++ )

             {

                 File directory = directories[i];

                 if ( directory != null )

                 {

                     cleaner.delete( directory, null, followSymLinks, failOnError );

                 }

             }

             if ( filesets != null )

             {

                 for ( int i = 0; i < filesets.length; i++ )

                 {

                     Fileset fileset = filesets[i];

                     if ( fileset.getDirectory() == null )

                     {

                         throw new MojoExecutionException( "Missing base directory for " + fileset );

                     }

                     GlobSelector selector = new GlobSelector( fileset.getIncludes(), fileset.getExcludes() );

                     cleaner.delete( fileset.getDirectory(), selector, fileset.isFollowSymlinks(), failOnError );

                 }

             }

         }

         catch ( IOException e )

         {

             throw new MojoExecutionException( "Failed to clean project: " + e.getMessage(), e );

         }

     }

     /**

      * Indicates whether verbose output is enabled.

      * 

      * @return <code>true</code> if verbose output is enabled, <code>false</code> otherwise.

      */

     private boolean isVerbose()

     {

         return ( verbose != null ) ? verbose.booleanValue() : getLog().isDebugEnabled();

     }

     /**

      * Gets the directories to clean (if any). The returned array may contain null entries.

      * 

      * @return The directories to clean or an empty array if none, never <code>null</code>.

      */

     private File[] getDirectories()

     {

         File[] directories;

         if ( excludeDefaultDirectories )

         {

             directories = new File[0];

         }

         else

         {

             directories = new File[] { directory, outputDirectory, testOutputDirectory, reportDirectory };

         }

         return directories;

     }

 }