package org.apache.maven.plugins.ejb;
   
   /*
    * 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.File;
  import java.io.IOException;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.io.input.XmlStreamReader;
  import org.apache.maven.archiver.MavenArchiveConfiguration;
  import org.apache.maven.archiver.MavenArchiver;
  import org.apache.maven.artifact.DependencyResolutionRequiredException;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.LifecyclePhase;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.MavenProjectHelper;
  import org.apache.maven.shared.filtering.MavenFileFilter;
  import org.apache.maven.shared.filtering.MavenFilteringException;
  import org.apache.maven.shared.filtering.MavenResourcesExecution;
  import org.apache.maven.shared.utils.io.FileUtils.FilterWrapper;
  import org.codehaus.plexus.archiver.Archiver;
  import org.codehaus.plexus.archiver.ArchiverException;
  import org.codehaus.plexus.archiver.jar.JarArchiver;
  import org.codehaus.plexus.archiver.jar.ManifestException;
  import org.codehaus.plexus.util.FileUtils;
  
  import com.google.inject.internal.util.Lists;
  
  /**
   * Build an EJB (and optional client) from the current project.
   *
   * @author <a href="evenisse@apache.org">Emmanuel Venisse</a>
   * @version $Id$
   */
  // CHECKSTYLE_OFF: LineLength
  @Mojo( name = "ejb", requiresDependencyResolution = ResolutionScope.RUNTIME, threadSafe = true, defaultPhase = LifecyclePhase.PACKAGE )
  // CHECKSTYLE_ON: LineLength
  public class EjbMojo
      extends AbstractMojo
  {
      private static final List<String> DEFAULT_INCLUDES_LIST =
          Collections.unmodifiableList( Lists.newArrayList( "**/**" ) );
  
      //@formatter:off
      private static final List<String> DEFAULT_CLIENT_EXCLUDES_LIST =
          Collections.unmodifiableList( 
              Lists.newArrayList( 
                "**/*Bean.class", 
                "**/*CMP.class", 
                "**/*Session.class",
                "**/package.html" 
              )
          );
      //@formatter:on
  
      /**
       * Default value for {@link #clientClassifier}
       */
      public static final String DEFAULT_CLIENT_CLASSIFIER = "client";
  
      /**
       * Default value for {@link #ejbJar}.
       */
      public static final String DEFAULT_EJBJAR = "META-INF/ejb-jar.xml";
  
      /**
       * The directory location for the generated EJB.
       */
      @Parameter( defaultValue = "${project.build.directory}", required = true, readonly = true )
      private File outputDirectory;
  
      /**
       * Directory that contains the resources which are packaged into the created archive {@code target/classes}.
       */
     @Parameter( defaultValue = "${project.build.outputDirectory}", required = true )
     private File sourceDirectory;
 
     /**
      * The name of the EJB file to generate.
      */
     @Parameter( defaultValue = "${project.build.finalName}", readonly = true )
     private String jarName;
 
     /**
      * Classifier to add to the artifact generated. If given, the artifact will be an attachment instead.
      */
     @Parameter
     private String classifier;
 
     /**
      * Classifier which is used for the client artifact.
      * 
      * @since 3.0.0
      */
     @Parameter( defaultValue = DEFAULT_CLIENT_CLASSIFIER )
     private String clientClassifier;
 
     /**
      * You can define the location of <code>ejb-jar.xml</code> file.
      */
     @Parameter( defaultValue = DEFAULT_EJBJAR )
     private String ejbJar;
 
     /**
      * Whether the EJB client jar should be generated or not.
      */
     @Parameter( defaultValue = "false" )
     private boolean generateClient;
 
     /**
      * The files and directories to exclude from the client jar. Usage:
      * <p/>
      * 
      * <pre>
      * &lt;clientExcludes&gt;
      * &nbsp;&nbsp;&lt;clientExclude&gt;**&#47;*Ejb.class&lt;&#47;clientExclude&gt;
      * &nbsp;&nbsp;&lt;clientExclude&gt;**&#47;*Bean.class&lt;&#47;clientExclude&gt;
      * &lt;&#47;clientExcludes&gt;
      * </pre>
      * 
      * <br/>
      * Attribute is used only if client jar is generated. <br/>
      * Default exclusions: **&#47;*Bean.class, **&#47;*CMP.class, **&#47;*Session.class, **&#47;package.html
      */
     @Parameter
     private List<String> clientExcludes;
 
     /**
      * The files and directories to include in the client jar. Usage:
      * <p/>
      * 
      * <pre>
      * &lt;clientIncludes&gt;
      * &nbsp;&nbsp;&lt;clientInclude&gt;**&#47;*&lt;&#47;clientInclude&gt;
      * &lt;&#47;clientIncludes&gt;
      * </pre>
      * 
      * <br/>
      * Attribute is used only if client jar is generated. <br/>
      * Default value: **&#47;**
      */
     @Parameter
     private List<String> clientIncludes;
 
     /**
      * The files and directories to exclude from the main EJB jar. Usage:
      * <p/>
      * 
      * <pre>
      * &lt;excludes&gt;
      *   &lt;exclude&gt;**&#47;*Ejb.class&lt;&#47;exclude&gt;
      *   &lt;exclude&gt;**&#47;*Bean.class&lt;&#47;exclude&gt;
      * &lt;&#47;excludes&gt;
      * </pre>
      * 
      * <br/>
      * Default exclusions: META-INF&#47;ejb-jar.xml, **&#47;package.html
      */
     @Parameter
     private List<String> excludes;
 
     /**
      * The Maven project.
      */
     @Parameter( defaultValue = "${project}", readonly = true, required = true )
     private MavenProject project;
 
     /**
      * The Jar archiver.
      */
     @Component( role = Archiver.class, hint = "jar" )
     private JarArchiver jarArchiver;
 
     /**
      * What EJB version should the EJB Plugin generate? Valid values are "2.x" or "3.x" (where x is a digit). When
      * ejbVersion is "3.x", the <code>ejb-jar.xml</code> file is optional.
      * <p/>
      * Usage:
      * 
      * <pre>
      * &lt;ejbVersion&gt;3.0&lt;&#47;ejbVersion&gt;
      * </pre>
      * 
      * @since 2.1
      */
     @Parameter( defaultValue = "3.1" )
     private String ejbVersion;
 
     /**
      * The client Jar archiver.
      */
     @Component( role = Archiver.class, hint = "jar" )
     private JarArchiver clientJarArchiver;
 
     /**
      * The Maven project's helper.
      */
     @Component
     private MavenProjectHelper projectHelper;
 
     /**
      * The archive configuration to use. See <a href="http://maven.apache.org/shared/maven-archiver/index.html">Maven
      * Archiver Reference</a>.
      */
     @Parameter
     private MavenArchiveConfiguration archive = new MavenArchiveConfiguration();
 
     /**
      * To escape interpolated value with windows path. c:\foo\bar will be replaced with c:\\foo\\bar.
      *
      * @since 2.3
      */
     @Parameter( defaultValue = "false" )
     private boolean escapeBackslashesInFilePath;
 
     /**
      * An expression preceded with this String won't be interpolated. \${foo} will be replaced with ${foo}.
      *
      * @since 2.3
      */
     @Parameter
     protected String escapeString;
 
     /**
      * To filter the deployment descriptor.
      *
      * @since 2.3
      */
     @Parameter( defaultValue = "false" )
     private boolean filterDeploymentDescriptor;
 
     /**
      * Filters (properties files) to include during the interpolation of the deployment descriptor.
      *
      * @since 2.3
      */
     @Parameter
     private List<String> filters;
 
     /**
      * @since 2.3
      */
     @Component( role = MavenFileFilter.class, hint = "default" )
     private MavenFileFilter mavenFileFilter;
 
     /**
      * @since 2.3
      */
     @Parameter( defaultValue = "${session}", readonly = true, required = true )
     private MavenSession session;
 
     private static final String EJB_TYPE = "ejb";
 
     private static final String EJB_CLIENT_TYPE = "ejb-client";
 
     /**
      * Generates an EJB jar and optionally an ejb-client jar.
      */
     public void execute()
         throws MojoExecutionException
     {
 
         if ( !sourceDirectory.exists() )
         {
             getLog().warn( "The created EJB jar will be empty cause the " + sourceDirectory.getPath()
                 + " did not exist." );
             sourceDirectory.mkdirs();
         }
 
         File jarFile = generateEjb();
 
         if ( hasClassifier() )
         {
             if ( !isClassifierValid() )
             {
                 String message = "The given classifier '" + getClassifier() + "' is not valid.";
                 getLog().error( message );
                 throw new MojoExecutionException( message );
             }
 
             // TODO: We should check the attached artifacts to be sure we don't attach
             // the same file twice...
             projectHelper.attachArtifact( project, EJB_TYPE, getClassifier(), jarFile );
         }
         else
         {
             if ( projectHasAlreadySetAnArtifact() )
             {
                 throw new MojoExecutionException( "You have to use a classifier "
                     + "to attach supplemental artifacts to the project instead of replacing them." );
             }
 
             project.getArtifact().setFile( jarFile );
         }
 
         if ( generateClient )
         {
             File clientJarFile = generateEjbClient();
             if ( hasClientClassifier() )
             {
                 if ( !isClientClassifierValid() )
                 {
                     String message = "The given client classifier '" + getClientClassifier() + "' is not valid.";
                     getLog().error( message );
                     throw new MojoExecutionException( message );
                 }
 
                 projectHelper.attachArtifact( project, EJB_CLIENT_TYPE, getClientClassifier(), clientJarFile );
             }
             else
             {
                 // FIXME: This does not make sense, cause a classifier for the client should always exist otherwise
                 // Failure!
                 projectHelper.attachArtifact( project, "ejb-client", getClientClassifier(), clientJarFile );
             }
 
         }
     }
 
     private boolean projectHasAlreadySetAnArtifact()
     {
         if ( getProject().getArtifact().getFile() != null )
         {
             return getProject().getArtifact().getFile().isFile();
         }
         else
         {
             return false;
         }
     }
 
     private File generateEjb()
         throws MojoExecutionException
     {
         File jarFile = EjbHelper.getJarFile( outputDirectory, jarName, getClassifier() );
 
         getLog().info( "Building EJB " + jarName + " with EJB version " + ejbVersion );
 
         MavenArchiver archiver = new MavenArchiver();
 
         archiver.setArchiver( jarArchiver );
 
         archiver.setOutputFile( jarFile );
 
         File deploymentDescriptor = new File( sourceDirectory, ejbJar );
 
         checkEJBVersionCompliance( deploymentDescriptor );
 
         try
         {
             List<String> defaultExcludes = Lists.newArrayList( ejbJar, "**/package.html" );
             List<String> defaultIncludes = DEFAULT_INCLUDES_LIST;
 
             IncludesExcludes ie =
                 new IncludesExcludes( Collections.<String>emptyList(), excludes, defaultIncludes, defaultExcludes );
 
             archiver.getArchiver().addDirectory( sourceDirectory, ie.resultingIncludes(), ie.resultingExcludes() );
 
             // FIXME: We should be able to filter more than just the deployment descriptor?
             if ( deploymentDescriptor.exists() )
             {
                 // EJB-34 Filter ejb-jar.xml
                 if ( filterDeploymentDescriptor )
                 {
                     filterDeploymentDescriptor( deploymentDescriptor );
                 }
                 archiver.getArchiver().addFile( deploymentDescriptor, ejbJar );
             }
 
             // create archive
             archiver.createArchive( session, project, archive );
         }
         catch ( ArchiverException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB archive: " + e.getMessage(), e );
         }
         catch ( ManifestException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB archive: " + e.getMessage(), e );
         }
         catch ( IOException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB archive: " + e.getMessage(), e );
         }
         catch ( DependencyResolutionRequiredException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB archive: " + e.getMessage(), e );
         }
         catch ( MavenFilteringException e )
         {
             throw new MojoExecutionException( "There was a problem filtering the deployment descriptor: "
                 + e.getMessage(), e );
         }
 
         return jarFile;
 
     }
 
     private File generateEjbClient()
         throws MojoExecutionException
     {
         File clientJarFile = EjbHelper.getJarFile( outputDirectory, jarName, getClientClassifier() );
 
         getLog().info( "Building EJB client " + clientJarFile.getPath() );
 
         MavenArchiver clientArchiver = new MavenArchiver();
 
         clientArchiver.setArchiver( clientJarArchiver );
 
         clientArchiver.setOutputFile( clientJarFile );
 
         try
         {
             List<String> defaultExcludes = DEFAULT_CLIENT_EXCLUDES_LIST;
             List<String> defaultIncludes = DEFAULT_INCLUDES_LIST;
 
             IncludesExcludes ie =
                 new IncludesExcludes( clientIncludes, clientExcludes, defaultIncludes, defaultExcludes );
 
             clientArchiver.getArchiver().addDirectory( sourceDirectory, ie.resultingIncludes(),
                                                        ie.resultingExcludes() );
 
             clientArchiver.createArchive( session, project, archive );
 
         }
         catch ( ArchiverException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB client archive: " + e.getMessage(),
                                               e );
         }
         catch ( ManifestException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB client archive: " + e.getMessage(),
                                               e );
         }
         catch ( IOException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB client archive: " + e.getMessage(),
                                               e );
         }
         catch ( DependencyResolutionRequiredException e )
         {
             throw new MojoExecutionException( "There was a problem creating the EJB client archive: " + e.getMessage(),
                                               e );
         }
 
         return clientJarFile;
     }
 
     private void checkEJBVersionCompliance( File deploymentDescriptor )
         throws MojoExecutionException
     {
         if ( !ejbVersion.matches( "\\A[2-3]\\.[0-9]\\z" ) )
         {
             throw new MojoExecutionException( "ejbVersion is not valid: " + ejbVersion
                 + ". Must be 2.x or 3.x (where x is a digit)" );
         }
 
         if ( ejbVersion.matches( "\\A2\\.[0-9]\\z" ) && !deploymentDescriptor.exists() )
         {
             throw new MojoExecutionException( "Error assembling EJB: " + ejbJar + " is required for ejbVersion 2.x" );
         }
     }
 
     private void filterDeploymentDescriptor( File deploymentDescriptor )
         throws MavenFilteringException, IOException
     {
         getLog().debug( "Filtering deployment descriptor." );
         MavenResourcesExecution mavenResourcesExecution = new MavenResourcesExecution();
         mavenResourcesExecution.setEscapeString( escapeString );
         List<FilterWrapper> filterWrappers =
             mavenFileFilter.getDefaultFilterWrappers( project, filters, escapeBackslashesInFilePath, this.session,
                                                       mavenResourcesExecution );
 
         // Create a temporary file that we can copy-and-filter
         File unfilteredDeploymentDescriptor = new File( sourceDirectory, ejbJar + ".unfiltered" );
         FileUtils.copyFile( deploymentDescriptor, unfilteredDeploymentDescriptor );
         mavenFileFilter.copyFile( unfilteredDeploymentDescriptor, deploymentDescriptor, true, filterWrappers,
                                   getEncoding( unfilteredDeploymentDescriptor ) );
         // Remove the temporary file
         FileUtils.forceDelete( unfilteredDeploymentDescriptor );
     }
 
     /**
      * @return true in case where the classifier is not {@code null} and contains something else than white spaces.
      */
     private boolean hasClassifier()
     {
         return EjbHelper.hasClassifier( getClassifier() );
     }
 
     /**
      * @return true in case where the clientClassifier is not {@code null} and contains something else than white
      *         spaces.
      */
     private boolean hasClientClassifier()
     {
         return EjbHelper.hasClassifier( getClientClassifier() );
     }
 
     private boolean isClassifierValid()
     {
         return EjbHelper.isClassifierValid( getClassifier() );
     }
 
     private boolean isClientClassifierValid()
     {
         return EjbHelper.isClassifierValid( getClientClassifier() );
     }
 
     /**
      * Get the encoding from an XML-file.
      *
      * @param xmlFile the XML-file
      * @return The encoding of the XML-file, or UTF-8 if it's not specified in the file
      * @throws IOException if an error occurred while reading the file
      */
     private String getEncoding( File xmlFile )
         throws IOException
     {
         XmlStreamReader xmlReader = null;
         try
         {
             xmlReader = new XmlStreamReader( xmlFile );
             final String encoding = xmlReader.getEncoding();
             xmlReader.close();
             xmlReader = null;
             return encoding;
         }
         finally
         {
             IOUtils.closeQuietly( xmlReader );
         }
     }
 
     public String getClassifier()
     {
         return classifier;
     }
 
     public String getClientClassifier()
     {
         return clientClassifier;
     }
 
     public MavenProject getProject()
     {
         return project;
     }
 
 }