package org.apache.maven.plugins.shade.filter;

 /*

  * 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.FileInputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.Collections;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Set;

 import org.apache.maven.artifact.Artifact;

 import org.apache.maven.plugin.logging.Log;

 import org.apache.maven.project.MavenProject;

 import org.codehaus.plexus.util.IOUtil;

 import org.vafer.jdependency.Clazz;

 import org.vafer.jdependency.Clazzpath;

 import org.vafer.jdependency.ClazzpathUnit;

 /**

  * A filter that prevents the inclusion of classes not required in the final jar.

  *

  * @author Torsten Curdt

  */

 public class MinijarFilter

     implements Filter

 {

     private Log log;

     private Set<Clazz> removable;

     private int classesKept;

     private int classesRemoved;

     public MinijarFilter( MavenProject project, Log log )

         throws IOException

     {

         this( project, log, Collections.<SimpleFilter>emptyList() );

     }

     /**

      *

      * @since 1.6

      */

     @SuppressWarnings( { "unchecked", "rawtypes" } )

     public MinijarFilter( MavenProject project, Log log, List<SimpleFilter> simpleFilters )

         throws IOException

     {

         this.log = log;

         Clazzpath cp = new Clazzpath();

         ClazzpathUnit artifactUnit =

             cp.addClazzpathUnit( new FileInputStream( project.getArtifact().getFile() ), project.toString() );

         for ( Iterator it = project.getArtifacts().iterator(); it.hasNext(); )

         {

             Artifact dependency = (Artifact) it.next();

             addDependencyToClasspath( cp, dependency );

         }

         removable = cp.getClazzes();

         removePackages( artifactUnit );

         removable.removeAll( artifactUnit.getClazzes() );

         removable.removeAll( artifactUnit.getTransitiveDependencies() );

         removeSpecificallyIncludedClasses( project, simpleFilters == null

             ? Collections.<SimpleFilter>emptyList()

             : simpleFilters );

     }

     private ClazzpathUnit addDependencyToClasspath( Clazzpath cp, Artifact dependency ) throws IOException

     {

         InputStream is = null;

         ClazzpathUnit clazzpathUnit = null;

         try

         {

             is = new FileInputStream( dependency.getFile() );

             clazzpathUnit = cp.addClazzpathUnit( is, dependency.toString() );

         }

         catch( ArrayIndexOutOfBoundsException e )

         {

             //trap ArrayIndexOutOfBoundsExceptions caused by malformed dependency classes (MSHADE-107)

             log.warn( dependency.toString() + " could not be analyzed for minimization; dependency is probably malformed." );

         }

         finally

         {

             IOUtil.close( is );

         }

         return clazzpathUnit;

     }

     private void removePackages( ClazzpathUnit artifactUnit )

     {

         Set<String> packageNames = new HashSet<String>();

         removePackages( artifactUnit.getClazzes(), packageNames );

         removePackages( artifactUnit.getTransitiveDependencies(), packageNames );

     }

     @SuppressWarnings( "rawtypes" )

     private void removePackages( Set clazzes, Set<String> packageNames )

     {

         Iterator it = clazzes.iterator();

         while ( it.hasNext() )

         {

             Clazz clazz = (Clazz) it.next();

             String name = clazz.getName();

             while ( name.contains( "." ) )

             {

                 name = name.substring( 0, name.lastIndexOf( '.' ) );

                 if ( packageNames.add( name ) )

                 {

                     removable.remove( new Clazz( name + ".package-info" ) );

                 }

             }

         }

     }

     @SuppressWarnings( "rawtypes" )

     private void removeSpecificallyIncludedClasses( MavenProject project, List<SimpleFilter> simpleFilters )

         throws IOException

     {

         //remove classes specifically included in filters

         Clazzpath checkCp = new Clazzpath();

         for ( Iterator it = project.getArtifacts().iterator(); it.hasNext(); )

         {

             Artifact dependency = (Artifact) it.next();

             File jar = dependency.getFile();

             for ( Iterator<SimpleFilter> i = simpleFilters.iterator(); i.hasNext(); )

             {

                 SimpleFilter simpleFilter = i.next();

                 if ( simpleFilter.canFilter( jar ) )

                 {

                     ClazzpathUnit depClazzpathUnit = addDependencyToClasspath( checkCp, dependency );

                     if ( depClazzpathUnit != null )

                     {

                         Iterator<Clazz> j = removable.iterator();

                         while ( j.hasNext() )

                         {

                             Clazz clazz = j.next();

                             if ( depClazzpathUnit.getClazzes().contains( clazz ) && simpleFilter.isSpecificallyIncluded(

                                 clazz.getName().replace( '.', '/' ) ) )

                             {

                                 log.info( clazz.getName() + " not removed because it was specifically included" );

                                 j.remove();

                             }

                         }

                     }

                 }

             }

         }

     }

     public boolean canFilter( File jar )

     {

         return true;

     }

     public boolean isFiltered( String classFile )

     {

         String className = classFile.replace( '/', '.' ).replaceFirst( "\\.class$", "" );

         Clazz clazz = new Clazz( className );

         if ( removable.contains( clazz ) )

         {

             log.debug( "Removing " + className );

             classesRemoved += 1;

             return true;

         }

         classesKept += 1;

         return false;

     }

     public void finished()

     {

         int classes_total = classesRemoved + classesKept;

         log.info(

             "Minimized " + classes_total + " -> " + classesKept + " (" + (int) ( 100 * classesKept / classes_total )

                 + "%)" );

     }

 }