package org.apache.maven.shared.dependency.analyzer;
   
   /*
    * 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.net.URL;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.LinkedHashSet;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.project.MavenProject;
  
  /**
   * 
   * 
   * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
   * @version $Id: DefaultProjectDependencyAnalyzer.java 661727 2008-05-30 14:21:49Z bentmann $
   * @plexus.component role="org.apache.maven.shared.dependency.analyzer.ProjectDependencyAnalyzer"
   */
  public class DefaultProjectDependencyAnalyzer
      implements ProjectDependencyAnalyzer
  {
      // fields -----------------------------------------------------------------
  
      /**
       * ClassAnalyzer
       * 
       * @plexus.requirement
       */
      private ClassAnalyzer classAnalyzer;
  
      /**
       * DependencyAnalyzer
       * 
       * @plexus.requirement
       */
      private DependencyAnalyzer dependencyAnalyzer;
  
      // ProjectDependencyAnalyzer methods --------------------------------------
  
      /*
       * @see org.apache.maven.shared.dependency.analyzer.ProjectDependencyAnalyzer#analyze(org.apache.maven.project.MavenProject)
       */
      public ProjectDependencyAnalysis analyze( MavenProject project )
          throws ProjectDependencyAnalyzerException
      {
          try
          {
              Map artifactClassMap = buildArtifactClassMap( project );
  
              Set dependencyClasses = buildDependencyClasses( project );
  
              Set declaredArtifacts = buildDeclaredArtifacts( project );
              
              Set usedArtifacts = buildUsedArtifacts( artifactClassMap, dependencyClasses );
              
              Set usedDeclaredArtifacts = new LinkedHashSet( declaredArtifacts );
              usedDeclaredArtifacts.retainAll( usedArtifacts );
  
              Set usedUndeclaredArtifacts = new LinkedHashSet( usedArtifacts );
              usedUndeclaredArtifacts = removeAll( usedUndeclaredArtifacts, declaredArtifacts );
  
              Set unusedDeclaredArtifacts = new LinkedHashSet( declaredArtifacts );
              unusedDeclaredArtifacts = removeAll( unusedDeclaredArtifacts, usedArtifacts );
  
              return new ProjectDependencyAnalysis( usedDeclaredArtifacts, usedUndeclaredArtifacts,
                                                    unusedDeclaredArtifacts );
          }
          catch ( IOException exception )
          {
              throw new ProjectDependencyAnalyzerException( "Cannot analyze dependencies", exception );
          }
      }
  
      /**
       * This method defines a new way to remove the artifacts by using the
      * conflict id. We don't care about the version here because there can be
      * only 1 for a given artifact anyway.
      * 
      * @param start
      *            initial set
      * @param remove
      *            set to exclude
      * @return set with remove excluded
      */
     private Set removeAll( Set start, Set remove )
     {
         Set results = new LinkedHashSet( start.size() );
         Iterator iter = start.iterator();
         while ( iter.hasNext() )
         {
             Artifact artifact = (Artifact) iter.next();
             Iterator iter2 = remove.iterator();
             boolean found = false;
             while ( iter2.hasNext() )
             {
                 Artifact artifact2 = (Artifact) iter2.next();
                 if ( artifact.getDependencyConflictId().equals( artifact2.getDependencyConflictId() ) )
                 {
                     found = true;
                 }
             }
             if ( !found )
             {
                 results.add( artifact );
             }
         }
         return results;
     }
 
     // private methods --------------------------------------------------------
 
     private Map buildArtifactClassMap( MavenProject project )
         throws IOException
     {
         Map artifactClassMap = new LinkedHashMap();
 
         Set dependencyArtifacts = project.getArtifacts();
 
         for ( Iterator iterator = dependencyArtifacts.iterator(); iterator.hasNext(); )
         {
             Artifact artifact = (Artifact) iterator.next();
 
             File file = artifact.getFile();
 
             if ( file != null && file.getName().endsWith( ".jar" ) )
             {
                 URL url = file.toURL();
 
                 Set classes = classAnalyzer.analyze( url );
 
                 artifactClassMap.put( artifact, classes );
             }
         }
 
         return artifactClassMap;
     }
 
     private Set buildDependencyClasses( MavenProject project )
         throws IOException
     {
         Set dependencyClasses = new HashSet();
         
         String outputDirectory = project.getBuild().getOutputDirectory();
         dependencyClasses.addAll( buildDependencyClasses( outputDirectory ) );
         
         String testOutputDirectory = project.getBuild().getTestOutputDirectory();
         dependencyClasses.addAll( buildDependencyClasses( testOutputDirectory ) );
 
         return dependencyClasses;
     }
     
     private Set buildDependencyClasses( String path )
         throws IOException
     {
         URL url = new File( path ).toURI().toURL();
 
         return dependencyAnalyzer.analyze( url );
     }
     
     private Set buildDeclaredArtifacts( MavenProject project )
     {
         Set declaredArtifacts = project.getDependencyArtifacts();
         
         if ( declaredArtifacts == null )
         {
             declaredArtifacts = Collections.EMPTY_SET;
         }
         
         return declaredArtifacts;
     }
     
     private Set buildUsedArtifacts( Map artifactClassMap, Set dependencyClasses )
     {
         Set usedArtifacts = new HashSet();
 
         for ( Iterator dependencyIterator = dependencyClasses.iterator(); dependencyIterator.hasNext(); )
         {
             String className = (String) dependencyIterator.next();
 
             Artifact artifact = findArtifactForClassName( artifactClassMap, className );
 
             if ( artifact != null )
             {
                 usedArtifacts.add( artifact );
             }
         }
         
         return usedArtifacts;
     }
 
     private Artifact findArtifactForClassName( Map artifactClassMap, String className )
     {
         for ( Iterator artifactIterator = artifactClassMap.keySet().iterator(); artifactIterator.hasNext(); )
         {
             Artifact artifact = (Artifact) artifactIterator.next();
 
             Set artifactClassNames = (Set) artifactClassMap.get( artifact );
 
             if ( artifactClassNames.contains( className ) )
             {
                 return artifact;
             }
         }
 
         return null;
     }
 }