package org.apache.maven.plugins.dependency.analyze;
   
   /*
    * 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.util.Collections;
  import java.util.HashMap;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.DependencyManagement;
  import org.apache.maven.model.Exclusion;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  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.codehaus.plexus.util.StringUtils;
  
  /**
   * This mojo looks at the dependencies after final resolution and looks for mismatches in your dependencyManagement
   * section. This mojo is also useful for detecting projects that override the dependencyManagement directly.
   * Set ignoreDirect to false to detect these otherwise normal conditions.
   *
   * @author <a href="mailto:brianefox@gmail.com">Brian Fox</a>
   * @since 2.0-alpha-3
   */
  @Mojo( name = "analyze-dep-mgt", requiresDependencyResolution = ResolutionScope.TEST, threadSafe = true )
  public class AnalyzeDepMgt
      extends AbstractMojo
  {
      // fields -----------------------------------------------------------------
  
      /**
       *
       */
      @Parameter( defaultValue = "${project}", readonly = true, required = true )
      private MavenProject project;
  
      /**
       * Fail the build if a problem is detected.
       */
      @Parameter( property = "mdep.analyze.failBuild", defaultValue = "false" )
      private boolean failBuild = false;
  
      /**
       * Ignore Direct Dependency Overrides of dependencyManagement section.
       */
      @Parameter( property = "mdep.analyze.ignore.direct", defaultValue = "true" )
      private boolean ignoreDirect = true;
  
      /**
       * Skip plugin execution completely.
       *
       * @since 2.7
       */
      @Parameter( property = "mdep.analyze.skip", defaultValue = "false" )
      private boolean skip;
  
      // Mojo methods -----------------------------------------------------------
  
      /*
       * @see org.apache.maven.plugin.Mojo#execute()
       */
      @Override
      public void execute()
          throws MojoExecutionException, MojoFailureException
      {
          if ( skip )
          {
              getLog().info( "Skipping plugin execution" );
              return;
          }
  
          boolean result = checkDependencyManagement();
          if ( result )
         {
             if ( this.failBuild )
 
             {
                 throw new MojoExecutionException( "Found Dependency errors." );
             }
             else
             {
                 getLog().warn( "Potential problems found in Dependency Management " );
             }
         }
     }
 
     /**
      * Does the work of checking the DependencyManagement Section.
      *
      * @return true if errors are found.
      * @throws MojoExecutionException
      */
     private boolean checkDependencyManagement()
         throws MojoExecutionException
     {
         boolean foundError = false;
 
         getLog().info( "Found Resolved Dependency/DependencyManagement mismatches:" );
 
         List<Dependency> depMgtDependencies = null;
 
         DependencyManagement depMgt = project.getDependencyManagement();
         if ( depMgt != null )
         {
             depMgtDependencies = depMgt.getDependencies();
         }
 
         if ( depMgtDependencies != null && !depMgtDependencies.isEmpty() )
         {
             // put all the dependencies from depMgt into a map for quick lookup
             Map<String, Dependency> depMgtMap = new HashMap<>();
             Map<String, Exclusion> exclusions = new HashMap<>();
             for ( Dependency depMgtDependency : depMgtDependencies )
             {
                 depMgtMap.put( depMgtDependency.getManagementKey(), depMgtDependency );
 
                 // now put all the exclusions into a map for quick lookup
                 exclusions.putAll( addExclusions( depMgtDependency.getExclusions() ) );
             }
 
             // get dependencies for the project (including transitive)
             Set<Artifact> allDependencyArtifacts = new LinkedHashSet<>( project.getArtifacts() );
 
             // don't warn if a dependency that is directly listed overrides
             // depMgt. That's ok.
             if ( this.ignoreDirect )
             {
                 getLog().info( "\tIgnoring Direct Dependencies." );
                 Set<Artifact> directDependencies = project.getDependencyArtifacts();
                 allDependencyArtifacts.removeAll( directDependencies );
             }
 
             // log exclusion errors
             List<Artifact> exclusionErrors = getExclusionErrors( exclusions, allDependencyArtifacts );
             for ( Artifact exclusion : exclusionErrors )
             {
                 getLog().info( StringUtils.stripEnd( getArtifactManagementKey( exclusion ), ":" )
                     + " was excluded in DepMgt, but version " + exclusion.getVersion()
                     + " has been found in the dependency tree." );
                 foundError = true;
             }
 
             // find and log version mismatches
             Map<Artifact, Dependency> mismatch = getMismatch( depMgtMap, allDependencyArtifacts );
             for ( Map.Entry<Artifact, Dependency> entry : mismatch.entrySet() )
             {
                 logMismatch( entry.getKey(), entry.getValue() );
                 foundError = true;
             }
             if ( !foundError )
             {
                 getLog().info( "\tNone" );
             }
         }
         else
         {
             getLog().info( "\tNothing in DepMgt." );
         }
 
         return foundError;
     }
 
     /**
      * Returns a map of the exclusions using the Dependency ManagementKey as the keyset.
      *
      * @param exclusionList to be added to the map.
      * @return a map of the exclusions using the Dependency ManagementKey as the keyset.
      */
     public Map<String, Exclusion> addExclusions( List<Exclusion> exclusionList )
     {
         if ( exclusionList != null )
         {
             return exclusionList.stream()
                     .collect( Collectors.toMap( this::getExclusionKey, exclusion -> exclusion ) );
         }
         return Collections.emptyMap();
     }
 
     /**
      * Returns a List of the artifacts that should have been excluded, but were found in the dependency tree.
      *
      * @param exclusions a map of the DependencyManagement exclusions, with the ManagementKey as the key and Dependency
      *            as the value.
      * @param allDependencyArtifacts resolved artifacts to be compared.
      * @return list of artifacts that should have been excluded.
      */
     public List<Artifact> getExclusionErrors( Map<String, Exclusion> exclusions, Set<Artifact> allDependencyArtifacts )
     {
         return allDependencyArtifacts.stream()
                 .filter( artifact -> exclusions.containsKey( getExclusionKey( artifact ) ) )
                 .collect( Collectors.toList( ) );
     }
 
     /**
      * @param artifact {@link Artifact}
      * @return The resulting GA.
      */
     public String getExclusionKey( Artifact artifact )
     {
         return artifact.getGroupId() + ":" + artifact.getArtifactId();
     }
 
     /**
      * @param ex The exclusion key.
      * @return The resulting combination of groupId+artifactId.
      */
     public String getExclusionKey( Exclusion ex )
     {
         return ex.getGroupId() + ":" + ex.getArtifactId();
     }
 
     /**
      * Calculate the mismatches between the DependencyManagement and resolved artifacts
      *
      * @param depMgtMap contains the Dependency.GetManagementKey as the keyset for quick lookup.
      * @param allDependencyArtifacts contains the set of all artifacts to compare.
      * @return a map containing the resolved artifact as the key and the listed dependency as the value.
      */
     public Map<Artifact, Dependency> getMismatch( Map<String, Dependency> depMgtMap,
                                                   Set<Artifact> allDependencyArtifacts )
     {
         Map<Artifact, Dependency> mismatchMap = new HashMap<>();
 
         for ( Artifact dependencyArtifact : allDependencyArtifacts )
         {
             Dependency depFromDepMgt = depMgtMap.get( getArtifactManagementKey( dependencyArtifact ) );
             if ( depFromDepMgt != null )
             {
                 // workaround for MNG-2961
                 dependencyArtifact.isSnapshot();
 
                 if ( depFromDepMgt.getVersion() != null
                     && !depFromDepMgt.getVersion().equals( dependencyArtifact.getBaseVersion() ) )
                 {
                     mismatchMap.put( dependencyArtifact, depFromDepMgt );
                 }
             }
         }
         return mismatchMap;
     }
 
     /**
      * This function displays the log to the screen showing the versions and information about the artifacts that don't
      * match.
      *
      * @param dependencyArtifact the artifact that was resolved.
      * @param dependencyFromDepMgt the dependency listed in the DependencyManagement section.
      * @throws MojoExecutionException in case of errors.
      */
     public void logMismatch( Artifact dependencyArtifact, Dependency dependencyFromDepMgt )
         throws MojoExecutionException
     {
         if ( dependencyArtifact == null || dependencyFromDepMgt == null )
         {
             throw new MojoExecutionException( "Invalid params: Artifact: " + dependencyArtifact + " Dependency: "
                 + dependencyFromDepMgt );
         }
 
         getLog().info( "\tDependency: " + StringUtils.stripEnd( dependencyFromDepMgt.getManagementKey(), ":" ) );
         getLog().info( "\t\tDepMgt  : " + dependencyFromDepMgt.getVersion() );
         getLog().info( "\t\tResolved: " + dependencyArtifact.getBaseVersion() );
     }
 
     /**
      * This function returns a string comparable with Dependency.GetManagementKey.
      *
      * @param artifact to gen the key for
      * @return a string in the form: groupId:ArtifactId:Type[:Classifier]
      */
     public String getArtifactManagementKey( Artifact artifact )
     {
         return artifact.getGroupId() + ":" + artifact.getArtifactId() + ":" + artifact.getType()
             + ( ( artifact.getClassifier() != null ) ? ":" + artifact.getClassifier() : "" );
     }
 
     /**
      * @return the failBuild
      */
     protected final boolean isFailBuild()
     {
         return this.failBuild;
     }
 
     /**
      * @param theFailBuild the failBuild to set
      */
     public void setFailBuild( boolean theFailBuild )
     {
         this.failBuild = theFailBuild;
     }
 
     /**
      * @return the project
      */
     protected final MavenProject getProject()
     {
         return this.project;
     }
 
     /**
      * @param theProject the project to set
      */
     public void setProject( MavenProject theProject )
     {
         this.project = theProject;
     }
 
     /**
      * @return the ignoreDirect
      */
     protected final boolean isIgnoreDirect()
     {
         return this.ignoreDirect;
     }
 
     /**
      * @param theIgnoreDirect the ignoreDirect to set
      */
     public void setIgnoreDirect( boolean theIgnoreDirect )
     {
         this.ignoreDirect = theIgnoreDirect;
     }
 }