package org.apache.maven.plugins.assembly.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 org.apache.maven.shared.utils.ReaderFactory;
  import org.apache.maven.shared.utils.WriterFactory;
  import org.codehaus.plexus.archiver.Archiver;
  import org.codehaus.plexus.archiver.ArchiverException;
  import org.codehaus.plexus.archiver.ResourceIterator;
  import org.codehaus.plexus.archiver.UnArchiver;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.components.io.fileselectors.FileInfo;
  import org.codehaus.plexus.util.xml.Xpp3Dom;
  import org.codehaus.plexus.util.xml.Xpp3DomBuilder;
  import org.codehaus.plexus.util.xml.Xpp3DomWriter;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  
  import javax.annotation.Nonnull;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.Writer;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Components XML file filter.
   *
   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
   *
   */
  @Component( role = ContainerDescriptorHandler.class, hint = "plexus", instantiationStrategy = "per-lookup" )
  public class ComponentsXmlArchiverFileFilter
      implements ContainerDescriptorHandler
  {
      public static final String COMPONENTS_XML_PATH = "META-INF/plexus/components.xml";
  
      // [jdcasey] Switched visibility to protected to allow testing. Also, because this class isn't final, it should
      // allow
      // some minimal access to the components accumulated for extending classes.
      Map<String, Xpp3Dom> components;
  
      private boolean excludeOverride = false;
  
      void addComponentsXml( final Reader componentsReader )
          throws XmlPullParserException, IOException
      {
          Xpp3Dom newDom = Xpp3DomBuilder.build( componentsReader );
  
          if ( newDom != null )
          {
              newDom = newDom.getChild( "components" );
          }
  
          if ( newDom != null )
          {
              final Xpp3Dom[] children = newDom.getChildren();
  
              for ( final Xpp3Dom component : children )
              {
                  if ( components == null )
                  {
                      components = new LinkedHashMap<>();
                  }
  
                  final String role = component.getChild( "role" ).getValue();
                  final Xpp3Dom child = component.getChild( "role-hint" );
                  final String roleHint = child != null ? child.getValue() : "";
  
                  final String key = role + roleHint;
                  if ( !components.containsKey( key ) )
                  {
                      components.put( key, component );
                  }
              }
          }
      }
 
     private void addToArchive( final Archiver archiver )
         throws IOException
     {
         if ( components != null )
         {
             final File f = File.createTempFile( "maven-assembly-plugin", "tmp" );
             f.deleteOnExit();
 
             
             try ( Writer fileWriter = WriterFactory.newXmlWriter( new FileOutputStream( f ) ) )
             {
                 final Xpp3Dom dom = new Xpp3Dom( "component-set" );
                 final Xpp3Dom componentDom = new Xpp3Dom( "components" );
                 dom.addChild( componentDom );
 
                 for ( final Xpp3Dom component : components.values() )
                 {
                     componentDom.addChild( component );
                 }
 
                 Xpp3DomWriter.write( fileWriter, dom );
             }
 
             excludeOverride = true;
 
             archiver.addFile( f, COMPONENTS_XML_PATH );
 
             excludeOverride = false;
         }
     }
 
     @Override
     public void finalizeArchiveCreation( final Archiver archiver )
     {
         // this will prompt the isSelected() call, below, for all resources added to the archive.
         // FIXME: This needs to be corrected in the AbstractArchiver, where
         // runArchiveFinalizers() is called before regular resources are added...
         // which is done because the manifest needs to be added first, and the
         // manifest-creation component is a finalizer in the assembly plugin...
         for ( final ResourceIterator it = archiver.getResources(); it.hasNext(); )
         {
             it.next();
         }
 
         try
         {
             addToArchive( archiver );
         }
         catch ( final IOException e )
         {
             throw new ArchiverException( "Error finalizing component-set for archive. Reason: " + e.getMessage(), e );
         }
     }
 
     @Override
     public List<String> getVirtualFiles()
     {
         if ( ( components != null ) && !components.isEmpty() )
         {
             return Collections.singletonList( COMPONENTS_XML_PATH );
         }
 
         return null;
     }
 
     @Override
     public boolean isSelected( @Nonnull final FileInfo fileInfo )
         throws IOException
     {
         if ( fileInfo.isFile() )
         {
             if ( excludeOverride )
             {
                 return true;
             }
 
             String entry = fileInfo.getName().replace( '\\', '/' );
 
             if ( entry.startsWith( "/" ) )
             {
                 entry = entry.substring( 1 );
             }
 
             if ( ComponentsXmlArchiverFileFilter.COMPONENTS_XML_PATH.equals( entry ) )
             {
                 try ( Reader reader = new BufferedReader( ReaderFactory.newXmlReader( fileInfo.getContents() ) ) )
                 {
                     addComponentsXml( reader );
                 }
                 catch ( final XmlPullParserException e )
                 {
                     final IOException error =
                         new IOException( "Error finalizing component-set for archive. Reason: " + e.getMessage(), e );
 
                     throw error;
                 }
                 return false;
             }
             else
             {
                 return true;
             }
         }
         else
         {
             return true;
         }
     }
 
     @Override
     public void finalizeArchiveExtraction( final UnArchiver unarchiver )
     {
     }
 
 }