package org.apache.maven.plugin.dependency.tree;
   
   /*
    * 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.artifact.repository.ArtifactRepository;
  import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
  import org.apache.maven.artifact.resolver.filter.ScopeArtifactFilter;
  import org.apache.maven.artifact.versioning.ArtifactVersion;
  import org.apache.maven.artifact.versioning.Restriction;
  import org.apache.maven.artifact.versioning.VersionRange;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugin.dependency.utils.DependencyUtil;
  import org.apache.maven.plugins.annotations.Component;
  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.shared.artifact.filter.StrictPatternExcludesArtifactFilter;
  import org.apache.maven.shared.artifact.filter.StrictPatternIncludesArtifactFilter;
  import org.apache.maven.shared.dependency.graph.DependencyGraphBuilder;
  import org.apache.maven.shared.dependency.graph.DependencyGraphBuilderException;
  import org.apache.maven.shared.dependency.graph.DependencyNode;
  import org.apache.maven.shared.dependency.graph.filter.AncestorOrSelfDependencyNodeFilter;
  import org.apache.maven.shared.dependency.graph.filter.AndDependencyNodeFilter;
  import org.apache.maven.shared.dependency.graph.filter.ArtifactDependencyNodeFilter;
  import org.apache.maven.shared.dependency.graph.filter.DependencyNodeFilter;
  import org.apache.maven.shared.dependency.graph.traversal.BuildingDependencyNodeVisitor;
  import org.apache.maven.shared.dependency.graph.traversal.CollectingDependencyNodeVisitor;
  import org.apache.maven.shared.dependency.graph.traversal.DependencyNodeVisitor;
  import org.apache.maven.shared.dependency.graph.traversal.FilteringDependencyNodeVisitor;
  import org.apache.maven.shared.dependency.graph.traversal.SerializingDependencyNodeVisitor;
  import org.apache.maven.shared.dependency.graph.traversal.SerializingDependencyNodeVisitor.GraphTokens;
  import org.apache.maven.shared.dependency.tree.DependencyTreeBuilder;
  import org.apache.maven.shared.dependency.tree.DependencyTreeBuilderException;
  import org.apache.maven.shared.dependency.tree.traversal.SerializingDependencyNodeVisitor.TreeTokens;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.StringWriter;
  import java.io.Writer;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Displays the dependency tree for this project.
   *
   * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
   * @version $Id: TreeMojo.html 922735 2014-09-18 19:32:48Z khmarbaise $
   * @since 2.0-alpha-5
   */
  @Mojo( name = "tree", requiresDependencyResolution = ResolutionScope.TEST, threadSafe = true )
  public class TreeMojo
      extends AbstractMojo
  {
      // fields -----------------------------------------------------------------
  
      /**
       * The Maven project.
       */
      @Parameter( defaultValue = "${project}", readonly = true, required = true )
      private MavenProject project;
  
      /**
       * The dependency tree builder to use.
       */
      @Component( hint = "default" )
      private DependencyGraphBuilder dependencyGraphBuilder;
  
      /**
       * The dependency tree builder to use for verbose output.
       */
      @Component
      private DependencyTreeBuilder dependencyTreeBuilder;
  
      /**
       * If specified, this parameter will cause the dependency tree to be written to the path specified, instead of
       * writing to the console.
       *
       * @deprecated use outputFile instead.
      */
     @Parameter( property = "output" )
     private File output;
 
     /**
      * If specified, this parameter will cause the dependency tree to be written to the path specified, instead of
      * writing to the console.
      *
      * @since 2.0-alpha-5
      */
     @Parameter( property = "outputFile" )
     private File outputFile;
 
     /**
      * If specified, this parameter will cause the dependency tree to be written using the specified format. Currently
      * supported format are: <code>text</code>, <code>dot</code>, <code>graphml</code> and <code>tgf</code>.
      * <p/>
      * These formats can be plotted to image files. An example of how to plot a dot file using
      * pygraphviz can be found <a href="http://networkx.lanl.gov/pygraphviz/tutorial.html#layout-and-drawing">here</a>.
      *
      * @since 2.2
      */
     @Parameter( property = "outputType", defaultValue = "text" )
     private String outputType;
 
     /**
      * The scope to filter by when resolving the dependency tree, or <code>null</code> to include dependencies from
      * all scopes. Note that this feature does not currently work due to MNG-3236.
      *
      * @see <a href="http://jira.codehaus.org/browse/MNG-3236">MNG-3236</a>
      * @since 2.0-alpha-5
      */
     @Parameter( property = "scope" )
     private String scope;
 
     /**
      * Whether to include omitted nodes in the serialized dependency tree. Notice this feature actually uses Maven 2
      * algorithm and <a href="http://maven.apache.org/shared/maven-dependency-tree/">may give wrong results when used
      * with Maven 3</a>.
      *
      * @since 2.0-alpha-6
      */
     @Parameter( property = "verbose", defaultValue = "false" )
     private boolean verbose;
 
     /**
      * The token set name to use when outputting the dependency tree. Possible values are <code>whitespace</code>,
      * <code>standard</code> or <code>extended</code>, which use whitespace, standard (ie ASCII) or extended
      * character sets respectively.
      *
      * @since 2.0-alpha-6
      */
     @Parameter( property = "tokens", defaultValue = "standard" )
     private String tokens;
 
     /**
      * A comma-separated list of artifacts to filter the serialized dependency tree by, or <code>null</code> not to
      * filter the dependency tree. The filter syntax is:
      * 
      * <pre>
      * [groupId]:[artifactId]:[type]:[version]
      * </pre>
      * 
      * where each pattern segment is optional and supports full and partial <code>*</code> wildcards. An empty pattern
      * segment is treated as an implicit wildcard.
      * <p>For example, <code>org.apache.*</code> will match all artifacts whose group id starts with
      * <code>org.apache.</code>, and <code>:::*-SNAPSHOT</code> will match all snapshot artifacts.</p>
      * 
      * @see StrictPatternIncludesArtifactFilter
      * @since 2.0-alpha-6
      */
     @Parameter( property = "includes" )
     private String includes;
 
     /**
      * A comma-separated list of artifacts to filter from the serialized dependency tree, or <code>null</code> not to
      * filter any artifacts from the dependency tree. The filter syntax is:
      * 
      * <pre>
      * [groupId]:[artifactId]:[type]:[version]
      * </pre>
      * 
      * where each pattern segment is optional and supports full and partial <code>*</code> wildcards. An empty pattern
      * segment is treated as an implicit wildcard.
      * <p>For example, <code>org.apache.*</code> will match all artifacts whose group id starts with
      * <code>org.apache.</code>, and <code>:::*-SNAPSHOT</code> will match all snapshot artifacts.</p>
      *
      * @see StrictPatternExcludesArtifactFilter
      * @since 2.0-alpha-6
      */
     @Parameter( property = "excludes" )
     private String excludes;
 
     /**
      * The computed dependency tree root node of the Maven project.
      */
     private DependencyNode rootNode;
 
     /**
      * Whether to append outputs into the output file or overwrite it.
      *
      * @since 2.2
      */
     @Parameter( property = "appendOutput", defaultValue = "false" )
     private boolean appendOutput;
 
     /**
      * Skip plugin execution completely.
      *
      * @since 2.7
      */
     @Parameter( property = "skip", defaultValue = "false" )
     private boolean skip;
 
     @Parameter( defaultValue = "${localRepository}", readonly = true )
     private ArtifactRepository localRepository;
 
     // Mojo methods -----------------------------------------------------------
 
     /*
      * @see org.apache.maven.plugin.Mojo#execute()
      */
     public void execute()
         throws MojoExecutionException, MojoFailureException
     {
         if ( isSkip() )
         {
             getLog().info( "Skipping plugin execution" );
             return;
         }
 
         if ( output != null )
         {
             getLog().warn( "The parameter output is deprecated. Use outputFile instead." );
             this.outputFile = output;
         }
 
         try
         {
             String dependencyTreeString;
 
             // TODO: note that filter does not get applied due to MNG-3236
 
             ArtifactFilter artifactFilter = createResolvingArtifactFilter();
 
             if ( verbose )
             {
                 // verbose mode force Maven 2 dependency tree component use
                 if ( ! isMaven2x() )
                 {
                     getLog().warn( "Using Maven 2 dependency tree to get verbose output, "
                                        + "which may be inconsistent with actual Maven 3 resolution" );
                 }
                 dependencyTreeString =
                     serializeVerboseDependencyTree( dependencyTreeBuilder.buildDependencyTree( project,
                                                                                                localRepository,
                                                                                                artifactFilter ) );
             }
             else
             {
                 // non-verbose mode use dependency graph component, which gives consistent results with Maven version
                 // running
                 rootNode = dependencyGraphBuilder.buildDependencyGraph( project, artifactFilter );
 
                 dependencyTreeString = serializeDependencyTree( rootNode );
             }
 
             if ( outputFile != null )
             {
                 DependencyUtil.write( dependencyTreeString, outputFile, this.appendOutput, getLog() );
 
                 getLog().info( "Wrote dependency tree to: " + outputFile );
             }
             else
             {
                 DependencyUtil.log( dependencyTreeString, getLog() );
             }
         }
         catch ( DependencyGraphBuilderException exception )
         {
             throw new MojoExecutionException( "Cannot build project dependency graph", exception );
         }
         catch ( DependencyTreeBuilderException exception )
         {
             throw new MojoExecutionException( "Cannot build project dependency tree", exception );
         }
         catch ( IOException exception )
         {
             throw new MojoExecutionException( "Cannot serialise project dependency graph", exception );
         }
     }
 
     // public methods ---------------------------------------------------------
 
     /**
      * Gets the Maven project used by this mojo.
      *
      * @return the Maven project
      */
     public MavenProject getProject()
     {
         return project;
     }
 
     /**
      * Gets the computed dependency graph root node for the Maven project.
      *
      * @return the dependency tree root node
      */
     public DependencyNode getDependencyGraph()
     {
         return rootNode;
     }
 
     public boolean isSkip()
     {
         return skip;
     }
 
     public void setSkip( boolean skip )
     {
         this.skip = skip;
     }
 
     // private methods --------------------------------------------------------
 
     /**
      * Gets the artifact filter to use when resolving the dependency tree.
      *
      * @return the artifact filter
      */
     private ArtifactFilter createResolvingArtifactFilter()
     {
         ArtifactFilter filter;
 
         // filter scope
         if ( scope != null )
         {
             getLog().debug( "+ Resolving dependency tree for scope '" + scope + "'" );
 
             filter = new ScopeArtifactFilter( scope );
         }
         else
         {
             filter = null;
         }
 
         return filter;
     }
 
     /**
      * Serializes the specified dependency tree to a string.
      *
      * @param rootNode the dependency tree root node to serialize
      * @return the serialized dependency tree
      */
     private String serializeDependencyTree( DependencyNode rootNode )
     {
         StringWriter writer = new StringWriter();
 
         DependencyNodeVisitor visitor = getSerializingDependencyNodeVisitor( writer );
 
         // TODO: remove the need for this when the serializer can calculate last nodes from visitor calls only
         visitor = new BuildingDependencyNodeVisitor( visitor );
 
         DependencyNodeFilter filter = createDependencyNodeFilter();
 
         if ( filter != null )
         {
             CollectingDependencyNodeVisitor collectingVisitor = new CollectingDependencyNodeVisitor();
             DependencyNodeVisitor firstPassVisitor = new FilteringDependencyNodeVisitor( collectingVisitor, filter );
             rootNode.accept( firstPassVisitor );
 
             DependencyNodeFilter secondPassFilter =
                 new AncestorOrSelfDependencyNodeFilter( collectingVisitor.getNodes() );
             visitor = new FilteringDependencyNodeVisitor( visitor, secondPassFilter );
         }
 
         rootNode.accept( visitor );
 
         return writer.toString();
     }
 
     /**
      * Serializes the specified dependency tree to a string.
      *
      * @param rootNode the dependency tree root node to serialize
      * @return the serialized dependency tree
      */
     private String serializeVerboseDependencyTree( org.apache.maven.shared.dependency.tree.DependencyNode rootNode )
     {
         StringWriter writer = new StringWriter();
 
         org.apache.maven.shared.dependency.tree.traversal.DependencyNodeVisitor visitor =
             new org.apache.maven.shared.dependency.tree.traversal.SerializingDependencyNodeVisitor( writer,
                                                                                                     toTreeTokens( tokens ) );
 
         // TODO: remove the need for this when the serializer can calculate last nodes from visitor calls only
         visitor = new org.apache.maven.shared.dependency.tree.traversal.BuildingDependencyNodeVisitor( visitor );
 
         org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter filter = createVerboseDependencyNodeFilter();
 
         if ( filter != null )
         {
             org.apache.maven.shared.dependency.tree.traversal.CollectingDependencyNodeVisitor collectingVisitor =
                 new org.apache.maven.shared.dependency.tree.traversal.CollectingDependencyNodeVisitor();
             org.apache.maven.shared.dependency.tree.traversal.DependencyNodeVisitor firstPassVisitor =
                 new org.apache.maven.shared.dependency.tree.traversal.FilteringDependencyNodeVisitor( collectingVisitor,
                                                                                                       filter );
             rootNode.accept( firstPassVisitor );
 
             org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter secondPassFilter =
                 new org.apache.maven.shared.dependency.tree.filter.AncestorOrSelfDependencyNodeFilter( collectingVisitor.getNodes() );
             visitor =
                 new org.apache.maven.shared.dependency.tree.traversal.FilteringDependencyNodeVisitor( visitor,
                                                                                                       secondPassFilter );
         }
 
         rootNode.accept( visitor );
 
         return writer.toString();
     }
 
     public DependencyNodeVisitor getSerializingDependencyNodeVisitor( Writer writer )
     {
         if ( "graphml".equals( outputType ) )
         {
             return new GraphmlDependencyNodeVisitor( writer );
         }
         else if ( "tgf".equals( outputType ) )
         {
             return new TGFDependencyNodeVisitor( writer );
         }
         else if ( "dot".equals( outputType ) )
         {
             return new DOTDependencyNodeVisitor( writer );
         }
         else
         {
             return new SerializingDependencyNodeVisitor( writer, toGraphTokens( tokens ) );
         }
     }
 
     /**
      * Gets the graph tokens instance for the specified name.
      *
      * @param tokens the graph tokens name
      * @return the <code>GraphTokens</code> instance
      */
     private GraphTokens toGraphTokens( String tokens )
     {
         GraphTokens graphTokens;
 
         if ( "whitespace".equals( tokens ) )
         {
             getLog().debug( "+ Using whitespace tree tokens" );
 
             graphTokens = SerializingDependencyNodeVisitor.WHITESPACE_TOKENS;
         }
         else if ( "extended".equals( tokens ) )
         {
             getLog().debug( "+ Using extended tree tokens" );
 
             graphTokens = SerializingDependencyNodeVisitor.EXTENDED_TOKENS;
         }
         else
         {
             graphTokens = SerializingDependencyNodeVisitor.STANDARD_TOKENS;
         }
 
         return graphTokens;
     }
 
     /**
      * Gets the tree tokens instance for the specified name.
      *
      * @param tokens the tree tokens name
      * @return the <code>TreeTokens</code> instance
      */
     private TreeTokens toTreeTokens( String tokens )
     {
         TreeTokens treeTokens;
 
         if ( "whitespace".equals( tokens ) )
         {
             getLog().debug( "+ Using whitespace tree tokens" );
 
             treeTokens =
                 org.apache.maven.shared.dependency.tree.traversal.SerializingDependencyNodeVisitor.WHITESPACE_TOKENS;
         }
         else if ( "extended".equals( tokens ) )
         {
             getLog().debug( "+ Using extended tree tokens" );
 
             treeTokens =
                 org.apache.maven.shared.dependency.tree.traversal.SerializingDependencyNodeVisitor.EXTENDED_TOKENS;
         }
         else
         {
             treeTokens =
                 org.apache.maven.shared.dependency.tree.traversal.SerializingDependencyNodeVisitor.STANDARD_TOKENS;
         }
 
         return treeTokens;
     }
 
     /**
      * Gets the dependency node filter to use when serializing the dependency graph.
      *
      * @return the dependency node filter, or <code>null</code> if none required
      */
     private DependencyNodeFilter createDependencyNodeFilter()
     {
         List<DependencyNodeFilter> filters = new ArrayList<DependencyNodeFilter>();
 
         // filter includes
         if ( includes != null )
         {
             List<String> patterns = Arrays.asList( includes.split( "," ) );
 
             getLog().debug( "+ Filtering dependency tree by artifact include patterns: " + patterns );
 
             ArtifactFilter artifactFilter = new StrictPatternIncludesArtifactFilter( patterns );
             filters.add( new ArtifactDependencyNodeFilter( artifactFilter ) );
         }
 
         // filter excludes
         if ( excludes != null )
         {
             List<String> patterns = Arrays.asList( excludes.split( "," ) );
 
             getLog().debug( "+ Filtering dependency tree by artifact exclude patterns: " + patterns );
 
             ArtifactFilter artifactFilter = new StrictPatternExcludesArtifactFilter( patterns );
             filters.add( new ArtifactDependencyNodeFilter( artifactFilter ) );
         }
 
         return filters.isEmpty() ? null : new AndDependencyNodeFilter( filters );
     }
 
     /**
      * Gets the dependency node filter to use when serializing the dependency tree.
      *
      * @return the dependency node filter, or <code>null</code> if none required
      */
     private org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter createVerboseDependencyNodeFilter()
     {
         List<org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter> filters =
             new ArrayList<org.apache.maven.shared.dependency.tree.filter.DependencyNodeFilter>();
 
         // filter includes
         if ( includes != null )
         {
             List<String> patterns = Arrays.asList( includes.split( "," ) );
 
             getLog().debug( "+ Filtering dependency tree by artifact include patterns: " + patterns );
 
             ArtifactFilter artifactFilter = new StrictPatternIncludesArtifactFilter( patterns );
             filters.add( new org.apache.maven.shared.dependency.tree.filter.ArtifactDependencyNodeFilter(
                                                                                                           artifactFilter ) );
         }
 
         // filter excludes
         if ( excludes != null )
         {
             List<String> patterns = Arrays.asList( excludes.split( "," ) );
 
             getLog().debug( "+ Filtering dependency tree by artifact exclude patterns: " + patterns );
 
             ArtifactFilter artifactFilter = new StrictPatternExcludesArtifactFilter( patterns );
             filters.add( new org.apache.maven.shared.dependency.tree.filter.ArtifactDependencyNodeFilter(
                                                                                                           artifactFilter ) );
         }
 
         return filters.isEmpty() ? null
                         : new org.apache.maven.shared.dependency.tree.filter.AndDependencyNodeFilter( filters );
     }
 
     //following is required because the version handling in maven code
     //doesn't work properly. I ripped it out of the enforcer rules.
 
 
     /**
      * Copied from Artifact.VersionRange. This is tweaked to handle singular ranges properly. Currently the default
      * containsVersion method assumes a singular version means allow everything. This method assumes that "2.0.4" ==
      * "[2.0.4,)"
      *
      * @param allowedRange range of allowed versions.
      * @param theVersion   the version to be checked.
      * @return true if the version is contained by the range.
      */
     public static boolean containsVersion( VersionRange allowedRange, ArtifactVersion theVersion )
     {
         ArtifactVersion recommendedVersion = allowedRange.getRecommendedVersion();
         if ( recommendedVersion == null )
         {
             @SuppressWarnings( "unchecked" )
             List<Restriction> restrictions = allowedRange.getRestrictions();
             for ( Restriction restriction : restrictions )
             {
                 if ( restriction.containsVersion( theVersion ) )
                 {
                     return true;
                 }
             }
         }
 
         // only singular versions ever have a recommendedVersion
         return recommendedVersion.compareTo( theVersion ) <= 0;
     }
 
     /**
      * Check the current Maven version to see if it's Maven 2.x.
      */
     protected static boolean isMaven2x()
     {
         return !canFindCoreClass( "org.apache.maven.project.DependencyResolutionRequest" ); // Maven 3 specific
     }
 
     private static boolean canFindCoreClass( String className)
     {
         try
         {
             Thread.currentThread().getContextClassLoader().loadClass( className );
 
             return true;
         }
         catch ( ClassNotFoundException e )
         {
             return false;
         }
     }
 }