package org.apache.maven.plugins.shade.mojo;
   
   /*
    * 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.Artifact;
  import org.apache.maven.artifact.repository.ArtifactRepository;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.Exclusion;
  import org.apache.maven.model.Model;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.LifecyclePhase;
  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.plugins.shade.ShadeRequest;
  import org.apache.maven.plugins.shade.Shader;
  import org.apache.maven.plugins.shade.filter.Filter;
  import org.apache.maven.plugins.shade.filter.MinijarFilter;
  import org.apache.maven.plugins.shade.filter.SimpleFilter;
  import org.apache.maven.plugins.shade.pom.PomWriter;
  import org.apache.maven.plugins.shade.relocation.Relocator;
  import org.apache.maven.plugins.shade.relocation.SimpleRelocator;
  import org.apache.maven.plugins.shade.resource.ManifestResourceTransformer;
  import org.apache.maven.plugins.shade.resource.ResourceTransformer;
  import org.apache.maven.project.DefaultProjectBuildingRequest;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.MavenProjectHelper;
  import org.apache.maven.project.ProjectBuilder;
  import org.apache.maven.project.ProjectBuildingException;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.project.ProjectBuildingResult;
  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.transfer.artifact.DefaultArtifactCoordinate;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResolver;
  import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResolverException;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.WriterFactory;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.Writer;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import javax.inject.Inject;
  import static org.apache.maven.plugins.shade.resource.UseDependencyReducedPom.createPomReplaceTransformers;
  
  /**
   * Mojo that performs shading delegating to the Shader component.
   *
   * @author Jason van Zyl
   * @author Mauro Talevi
   * @author David Blevins
   * @author Hiram Chirino
   */
  // CHECKSTYLE_OFF: LineLength
  @Mojo( name = "shade", defaultPhase = LifecyclePhase.PACKAGE, threadSafe = true, requiresDependencyResolution = ResolutionScope.RUNTIME )
  // CHECKSTYLE_ON: LineLength
  public class ShadeMojo
      extends AbstractMojo
  {
      /**
       * The current Maven session.
       */
      @Parameter( defaultValue = "${session}", readonly = true, required = true )
      private MavenSession session;
 
     /**
      * The current Maven project.
      */
     @Parameter( defaultValue = "${project}", readonly = true, required = true )
     private MavenProject project;
 
     @Component
     private MavenProjectHelper projectHelper;
 
     @Component( hint = "default", role = org.apache.maven.plugins.shade.Shader.class )
     private Shader shader;
 
     /**
      * The dependency graph builder to use.
      */
     @Component
     private DependencyGraphBuilder dependencyGraphBuilder;
 
     /**
      * ProjectBuilder, needed to create projects from the artifacts.
      */
     @Component
     private ProjectBuilder projectBuilder;
 
     /**
      * Remote repositories which will be searched for source attachments.
      */
     @Parameter( readonly = true, required = true, defaultValue = "${project.remoteArtifactRepositories}" )
     protected List<ArtifactRepository> remoteArtifactRepositories;
 
     /**
      * Local maven repository.
      */
     @Parameter( readonly = true, required = true, defaultValue = "${localRepository}" )
     protected ArtifactRepository localRepository;
 
     /**
      * Artifact resolver, needed to download source jars for inclusion in classpath.
      */
     @Component
     protected ArtifactResolver artifactResolver;
 
     /**
      * Artifacts to include/exclude from the final artifact. Artifacts are denoted by composite identifiers of the
      * general form <code>groupId:artifactId:type:classifier</code>. Since version 1.3, the wildcard characters '*' and
      * '?' can be used within the sub parts of those composite identifiers to do pattern matching. For convenience, the
      * syntax <code>groupId</code> is equivalent to <code>groupId:*:*:*</code>, <code>groupId:artifactId</code> is
      * equivalent to <code>groupId:artifactId:*:*</code> and <code>groupId:artifactId:classifier</code> is equivalent to
      * <code>groupId:artifactId:*:classifier</code>. For example:
      * 
      * <pre>
      * &lt;artifactSet&gt;
      *   &lt;includes&gt;
      *     &lt;include&gt;org.apache.maven:*&lt;/include&gt;
      *   &lt;/includes&gt;
      *   &lt;excludes&gt;
      *     &lt;exclude&gt;*:maven-core&lt;/exclude&gt;
      *   &lt;/excludes&gt;
      * &lt;/artifactSet&gt;
      * </pre>
      */
     @Parameter
     private ArtifactSet artifactSet;
 
     /**
      * Packages to be relocated. For example:
      * 
      * <pre>
      * &lt;relocations&gt;
      *   &lt;relocation&gt;
      *     &lt;pattern&gt;org.apache&lt;/pattern&gt;
      *     &lt;shadedPattern&gt;hidden.org.apache&lt;/shadedPattern&gt;
      *     &lt;includes&gt;
      *       &lt;include&gt;org.apache.maven.*&lt;/include&gt;
      *     &lt;/includes&gt;
      *     &lt;excludes&gt;
      *       &lt;exclude&gt;org.apache.maven.Public*&lt;/exclude&gt;
      *     &lt;/excludes&gt;
      *   &lt;/relocation&gt;
      * &lt;/relocations&gt;
      * </pre>
      * 
      * <em>Note:</em> Support for includes exists only since version 1.4.
      */
     @SuppressWarnings( "MismatchedReadAndWriteOfArray" )
     @Parameter
     private PackageRelocation[] relocations;
 
     /**
      * Resource transformers to be used. Please see the "Examples" section for more information on available
      * transformers and their configuration.
      */
     @Parameter
     private ResourceTransformer[] transformers;
 
     /**
      * Archive Filters to be used. Allows you to specify an artifact in the form of a composite identifier as used by
      * {@link #artifactSet} and a set of include/exclude file patterns for filtering which contents of the archive are
      * added to the shaded jar. From a logical perspective, includes are processed before excludes, thus it's possible
      * to use an include to collect a set of files from the archive then use excludes to further reduce the set. By
      * default, all files are included and no files are excluded. If multiple filters apply to an artifact, the
      * intersection of the matched files will be included in the final JAR. For example:
      * 
      * <pre>
      * &lt;filters&gt;
      *   &lt;filter&gt;
      *     &lt;artifact&gt;junit:junit&lt;/artifact&gt;
      *     &lt;includes&gt;
      *       &lt;include&gt;org/junit/**&lt;/include&gt;
      *     &lt;/includes&gt;
      *     &lt;excludes&gt;
      *       &lt;exclude&gt;org/junit/experimental/**&lt;/exclude&gt;
      *     &lt;/excludes&gt;
      *   &lt;/filter&gt;
      * &lt;/filters&gt;
      * </pre>
      */
     @SuppressWarnings( "MismatchedReadAndWriteOfArray" )
     @Parameter
     private ArchiveFilter[] filters;
 
     /**
      * The destination directory for the shaded artifact.
      */
     @Parameter( defaultValue = "${project.build.directory}" )
     private File outputDirectory;
 
     /**
      * The name of the shaded artifactId.
      * <p/>
      * If you like to change the name of the native artifact, you may use the &lt;build>&lt;finalName> setting. If this
      * is set to something different than &lt;build>&lt;finalName>, no file replacement will be performed, even if
      * shadedArtifactAttached is being used.
      */
     @Parameter
     private String finalName;
 
     /**
      * The name of the shaded artifactId. So you may want to use a different artifactId and keep the standard version.
      * If the original artifactId was "foo" then the final artifact would be something like foo-1.0.jar. So if you
      * change the artifactId you might have something like foo-special-1.0.jar.
      */
     @Parameter( defaultValue = "${project.artifactId}" )
     private String shadedArtifactId;
 
     /**
      * If specified, this will include only artifacts which have groupIds which start with this.
      */
     @Parameter
     private String shadedGroupFilter;
 
     /**
      * Defines whether the shaded artifact should be attached as classifier to the original artifact. If false, the
      * shaded jar will be the main artifact of the project
      */
     @Parameter
     private boolean shadedArtifactAttached;
 
     /**
      * Flag whether to generate a simplified POM for the shaded artifact. If set to <code>true</code>, dependencies that
      * have been included into the uber JAR will be removed from the <code>&lt;dependencies&gt;</code> section of the
      * generated POM. The reduced POM will be named <code>dependency-reduced-pom.xml</code> and is stored into the same
      * directory as the shaded artifact. Unless you also specify dependencyReducedPomLocation, the plugin will create a
      * temporary file named <code>dependency-reduced-pom.xml</code> in the project basedir.
      */
     @Parameter( defaultValue = "true" )
     private boolean createDependencyReducedPom;
 
     /**
      * Where to put the dependency reduced pom. Note: setting a value for this parameter with a directory other than
      * ${basedir} will change the value of ${basedir} for all executions that come after the shade execution. This is
      * often not what you want. This is considered an open issue with this plugin.
      *
      * @since 1.7
      */
     @Parameter( defaultValue = "${basedir}/dependency-reduced-pom.xml" )
     private File dependencyReducedPomLocation;
 
     /**
      * Create a dependency-reduced POM in ${basedir}/drp-UNIQUE.pom. This avoids build collisions of parallel builds
      * without moving the dependency-reduced POM to a different directory. The property
      * maven.shade.dependency-reduced-pom is set to the generated filename.
      *
      * @since 1.7.2
      */
     @Parameter( defaultValue = "false" )
     private boolean generateUniqueDependencyReducedPom;
 
     /**
      * Add dependency reduced POM to the JAR instead of the original one provided by the project.
      * If {@code createDependencyReducedPom} is {@code false} this parameter will be ignored.
      *
      * @since 3.3.0
      */
     @Parameter( defaultValue = "false" )
     private boolean useDependencyReducedPomInJar;
 
     /**
      * When true, dependencies are kept in the pom but with scope 'provided'; when false, the dependency is removed.
      */
     @Parameter
     private boolean keepDependenciesWithProvidedScope;
 
     /**
      * When true, transitive deps of removed dependencies are promoted to direct dependencies. This should allow the
      * drop in replacement of the removed deps with the new shaded jar and everything should still work.
      */
     @Parameter
     private boolean promoteTransitiveDependencies;
 
     /**
      * The name of the classifier used in case the shaded artifact is attached.
      */
     @Parameter( defaultValue = "shaded" )
     private String shadedClassifierName;
 
     /**
      * When true, it will attempt to create a sources jar as well
      */
     @Parameter
     private boolean createSourcesJar;
 
     /**
      * When true, it will attempt to create a test sources jar.
      */
     @Parameter
     private boolean createTestSourcesJar;
 
     /**
      * When true, it will attempt to shade the contents of Java source files when creating the sources JAR. When false,
      * it will just relocate the Java source files to the shaded paths, but will not modify the actual source file
      * contents.
      * <p>
      * <b>Please note:</b> This feature uses a heuristic search & replace approach which covers many, but definitely not
      * all possible cases of source code shading and its excludes. There is no full Java parser behind this
      * functionality, which would be the only way to get this right for Java language elements. As for matching within
      * Java string constants, this is next to impossible to get 100% right, trying to guess if they are used in
      * reflection or not.
      * <p>
      * Please understand that the source shading feature is not meant as a source code generator anyway, merely as a
      * tool creating reasonably plausible source code when navigating to a relocated library class from an IDE,
      * hopefully displaying source code which makes 95% sense - no more, no less.
      */
     @Parameter( property = "shadeSourcesContent", defaultValue = "false" )
     private boolean shadeSourcesContent;
 
     /**
      * When true, dependencies will be stripped down on the class level to only the transitive hull required for the
      * artifact. <em>Note:</em> Usage of this feature requires Java 1.5 or higher.
      *
      * @since 1.4
      */
     @Parameter
     private boolean minimizeJar;
 
     /**
      * The path to the output file for the shaded artifact. When this parameter is set, the created archive will neither
      * replace the project's main artifact nor will it be attached. Hence, this parameter causes the parameters
      * {@link #finalName}, {@link #shadedArtifactAttached}, {@link #shadedClassifierName} and
      * {@link #createDependencyReducedPom} to be ignored when used.
      *
      * @since 1.3
      */
     @Parameter
     private File outputFile;
 
     /**
      * You can pass here the roleHint about your own Shader implementation plexus component.
      *
      * @since 1.6
      */
     @Parameter
     private String shaderHint;
 
     /**
      * When true, the version of each dependency of the reduced pom will be based on the baseVersion of the original
      * dependency instead of its resolved version. For example, if the original pom (transitively) depends on
      * a:a:2.7-SNAPSHOT, if useBaseVersion is set to false, the reduced pom will depend on a:a:2.7-20130312.222222-12
      * whereas if useBaseVersion is set to true, the reduced pom will depend on a:a:2.7-SNAPSHOT
      *
      * @since 3.0
      */
     @Parameter( defaultValue = "false" )
     private boolean useBaseVersion;
 
     /**
      * When true, creates a shaded test-jar artifact as well.
      */
     @Parameter( defaultValue = "false" )
     private boolean shadeTestJar;
 
     /**
      * All the present Shaders.
      */
     @Inject
     private Map<String, Shader> shaders;
 
     /**
      * When true, skips the execution of this MOJO.
      * @since 3.3.0
      */
     @Parameter( defaultValue = "false" )
     private boolean skip;
     
     /**
      * @throws MojoExecutionException in case of an error.
      */
     public void execute()
         throws MojoExecutionException
     {
         if ( skip )
         {
             getLog().info( "Shading has been skipped." );
             return;
         }
 
         setupHintedShader();
 
         Set<File> artifacts = new LinkedHashSet<>();
         Set<String> artifactIds = new LinkedHashSet<>();
         Set<File> sourceArtifacts = new LinkedHashSet<>();
         Set<File> testArtifacts = new LinkedHashSet<>();
         Set<File> testSourceArtifacts = new LinkedHashSet<>();
 
         ArtifactSelector artifactSelector =
             new ArtifactSelector( project.getArtifact(), artifactSet, shadedGroupFilter );
 
         if ( artifactSelector.isSelected( project.getArtifact() ) && !"pom".equals( project.getArtifact().getType() ) )
         {
             if ( invalidMainArtifact() )
             {
                 createErrorOutput();
                 throw new MojoExecutionException( "Failed to create shaded artifact, "
                     + "project main artifact does not exist." );
             }
 
             artifacts.add( project.getArtifact().getFile() );
 
             if ( createSourcesJar )
             {
                 File file = shadedSourcesArtifactFile();
                 if ( file.isFile() )
                 {
                     sourceArtifacts.add( file );
                 }
             }
 
             if ( shadeTestJar )
             {
                 File file = shadedTestArtifactFile();
                 if ( file.isFile() )
                 {
                     testArtifacts.add( file );
                 }
             }
 
             if ( createTestSourcesJar )
             {
                 File file = shadedTestSourcesArtifactFile();
                 if ( file.isFile() )
                 {
                     testSourceArtifacts.add( file );
                 }
             }
         }
 
         processArtifactSelectors( artifacts, artifactIds, sourceArtifacts, testArtifacts, testSourceArtifacts,
             artifactSelector );
 
         File outputJar = ( outputFile != null ) ? outputFile : shadedArtifactFileWithClassifier();
         File sourcesJar = shadedSourceArtifactFileWithClassifier();
         File testJar = shadedTestArtifactFileWithClassifier();
         File testSourcesJar = shadedTestSourceArtifactFileWithClassifier();
 
         // Now add our extra resources
         try
         {
             List<Filter> filters = getFilters();
 
             List<Relocator> relocators = getRelocators();
 
             List<ResourceTransformer> resourceTransformers = getResourceTransformers();
 
             if ( createDependencyReducedPom )
             {
                 createDependencyReducedPom( artifactIds );
 
                 if ( useDependencyReducedPomInJar )
                 {
                     // In some cases the used implementation of the resourceTransformers is immutable.
                     resourceTransformers = new ArrayList<>( resourceTransformers );
                     resourceTransformers.addAll(
                             createPomReplaceTransformers( project, dependencyReducedPomLocation ) );
                 }
             }
 
             ShadeRequest shadeRequest = shadeRequest( "jar", artifacts, outputJar, filters, relocators,
                     resourceTransformers );
 
             shader.shade( shadeRequest );
 
             if ( createSourcesJar )
             {
                 ShadeRequest shadeSourcesRequest =
                     createShadeSourcesRequest( "sources-jar", sourceArtifacts, sourcesJar, filters, relocators,
                             resourceTransformers );
 
                 shader.shade( shadeSourcesRequest );
             }
 
             if ( shadeTestJar )
             {
                 ShadeRequest shadeTestRequest =
                     shadeRequest( "test-jar", testArtifacts, testJar, filters, relocators, resourceTransformers );
 
                 shader.shade( shadeTestRequest );
             }
 
             if ( createTestSourcesJar )
             {
                 ShadeRequest shadeTestSourcesRequest =
                     createShadeSourcesRequest( "test-sources-jar", testSourceArtifacts, testSourcesJar, filters,
                         relocators, resourceTransformers );
 
                 shader.shade( shadeTestSourcesRequest );
             }
 
             if ( outputFile == null )
             {
                 boolean renamed = false;
 
                 // rename the output file if a specific finalName is set
                 // but don't rename if the finalName is the <build><finalName>
                 // because this will be handled implicitly later
                 if ( finalName != null && finalName.length() > 0 //
                     && !finalName.equals( project.getBuild().getFinalName() ) )
                 {
                     String finalFileName = finalName + "." + project.getArtifact().getArtifactHandler().getExtension();
                     File finalFile = new File( outputDirectory, finalFileName );
                     replaceFile( finalFile, outputJar );
                     outputJar = finalFile;
 
                     // Also support the sources JAR
                     if ( createSourcesJar )
                     {
                         finalFileName = finalName + "-sources.jar";
                         finalFile = new File( outputDirectory, finalFileName );
                         replaceFile( finalFile, sourcesJar );
                         sourcesJar = finalFile;
                     }
 
                     // Also support the test JAR
                     if ( shadeTestJar )
                     {
                         finalFileName = finalName + "-tests.jar";
                         finalFile = new File( outputDirectory, finalFileName );
                         replaceFile( finalFile, testJar );
                         testJar = finalFile;
                     }
 
                     if ( createTestSourcesJar )
                     {
                         finalFileName = finalName + "-test-sources.jar";
                         finalFile = new File( outputDirectory, finalFileName );
                         replaceFile( finalFile, testSourcesJar );
                         testSourcesJar = finalFile;
                     }
                 
                     renamed = true;
                 }
 
                 if ( shadedArtifactAttached )
                 {
                     getLog().info( "Attaching shaded artifact." );
                     projectHelper.attachArtifact( project, project.getArtifact().getType(), shadedClassifierName,
                                                   outputJar );
                     if ( createSourcesJar )
                     {
                         projectHelper.attachArtifact( project, "java-source", shadedClassifierName + "-sources",
                                                       sourcesJar );
                     }
 
                     if ( shadeTestJar )
                     {
                         projectHelper.attachArtifact( project, "test-jar", shadedClassifierName + "-tests",
                                                       testJar );
                     }
 
                     if ( createTestSourcesJar )
                     {
                         projectHelper.attachArtifact( project, "java-source",
                                 shadedClassifierName + "-test-sources", testSourcesJar );
                     }
                 }
                 else if ( !renamed )
                 {
                     getLog().info( "Replacing original artifact with shaded artifact." );
                     File originalArtifact = project.getArtifact().getFile();
                     if ( originalArtifact != null )
                     {
                         replaceFile( originalArtifact, outputJar );
 
                         if ( createSourcesJar )
                         {
                             getLog().info( "Replacing original source artifact with shaded source artifact." );
                             File shadedSources = shadedSourcesArtifactFile();
 
                             replaceFile( shadedSources, sourcesJar );
 
                             projectHelper.attachArtifact( project, "java-source", "sources", shadedSources );
                         }
 
                         if ( shadeTestJar )
                         {
                             getLog().info( "Replacing original test artifact with shaded test artifact." );
                             File shadedTests = shadedTestArtifactFile();
 
                             replaceFile( shadedTests, testJar );
 
                             projectHelper.attachArtifact( project, "test-jar", shadedTests );
                         }
 
                         if ( createTestSourcesJar )
                         {
                             getLog().info( "Replacing original test source artifact "
                                 + "with shaded test source artifact." );
                             File shadedTestSources = shadedTestSourcesArtifactFile();
 
                             replaceFile( shadedTestSources, testSourcesJar );
 
                             projectHelper.attachArtifact( project, "java-source", "test-sources",
                                 shadedTestSources );
                         }
                     }
                 }
             }
         }
         catch ( Exception e )
         {
             throw new MojoExecutionException( "Error creating shaded jar: " + e.getMessage(), e );
         }
     }
 
     private void createErrorOutput()
     {
         getLog().error( "The project main artifact does not exist. This could have the following" );
         getLog().error( "reasons:" );
         getLog().error( "- You have invoked the goal directly from the command line. This is not" );
         getLog().error( "  supported. Please add the goal to the default lifecycle via an" );
         getLog().error( "  <execution> element in your POM and use \"mvn package\" to have it run." );
         getLog().error( "- You have bound the goal to a lifecycle phase before \"package\". Please" );
         getLog().error( "  remove this binding from your POM such that the goal will be run in" );
         getLog().error( "  the proper phase." );
         getLog().error( "- You removed the configuration of the maven-jar-plugin that produces the main artifact." );
     }
 
     private ShadeRequest shadeRequest( String shade, Set<File> artifacts, File outputJar, List<Filter> filters,
                                        List<Relocator> relocators, List<ResourceTransformer> resourceTransformers )
     {
         ShadeRequest shadeRequest = new ShadeRequest();
         shadeRequest.setJars( artifacts );
         shadeRequest.setUberJar( outputJar );
         shadeRequest.setFilters( filters );
         shadeRequest.setRelocators( relocators );
         shadeRequest.setResourceTransformers( toResourceTransformers( shade, resourceTransformers ) );
         return shadeRequest;
     }
 
     private ShadeRequest createShadeSourcesRequest( String shade, Set<File> testArtifacts, File testJar,
                                                     List<Filter> filters, List<Relocator> relocators,
                                                     List<ResourceTransformer> resourceTransformers )
     {
         ShadeRequest shadeSourcesRequest =
             shadeRequest( shade, testArtifacts, testJar, filters, relocators, resourceTransformers );
         shadeSourcesRequest.setShadeSourcesContent( shadeSourcesContent );
         return shadeSourcesRequest;
     }
 
     private void setupHintedShader()
         throws MojoExecutionException
     {
         if ( shaderHint != null )
         {
             shader = shaders.get( shaderHint );
 
             if ( shader == null )
             {
                 throw new MojoExecutionException(
                     "unable to lookup own Shader implementation with hint: '" + shaderHint + "'"
                 );
             }
         }
     }
 
     private void processArtifactSelectors( Set<File> artifacts, Set<String> artifactIds, Set<File> sourceArtifacts,
                                            Set<File> testArtifacts, Set<File> testSourceArtifacts,
                                            ArtifactSelector artifactSelector )
     {
 
         List<String> excludedArtifacts = new ArrayList<>();
         List<String> pomArtifacts = new ArrayList<>();
         List<String> emptySourceArtifacts = new ArrayList<>();
         List<String> emptyTestArtifacts = new ArrayList<>();
         List<String> emptyTestSourceArtifacts = new ArrayList<>();
 
         for ( Artifact artifact : project.getArtifacts() )
         {
             if ( !artifactSelector.isSelected( artifact ) )
             {
                 excludedArtifacts.add( artifact.getId() );
 
                 continue;
             }
 
             if ( "pom".equals( artifact.getType() ) )
             {
                 pomArtifacts.add( artifact.getId() );
                 continue;
             }
 
             getLog().info( "Including " + artifact.getId() + " in the shaded jar." );
 
             artifacts.add( artifact.getFile() );
             artifactIds.add( getId( artifact ) );
 
             if ( createSourcesJar )
             {
                 File file = resolveArtifactForClassifier( artifact, "sources" );
                 if ( file != null )
                 {
                     if ( file.length() > 0 )
                     {
                         sourceArtifacts.add( file );
                     }
                     else
                     {
                         emptySourceArtifacts.add( artifact.getArtifactId() );
                     }
                 }
             }
 
             if ( shadeTestJar )
             {
                 File file = resolveArtifactForClassifier( artifact, "tests" );
                 if ( file != null )
                 {
                     if ( file.length() > 0 )
                     {
                         testArtifacts.add( file );
                     }
                     else
                     {
                         emptyTestArtifacts.add( artifact.getId() );
                     }
                 }
             }
 
             if ( createTestSourcesJar )
             {
                 File file = resolveArtifactForClassifier( artifact, "test-sources" );
                 if ( file != null )
                 {
                     testSourceArtifacts.add( file );
                 }
                 else
                 {
                     emptyTestSourceArtifacts.add( artifact.getId() );
                 }
             }
         }
 
         for ( String artifactId : excludedArtifacts )
         {
             getLog().info( "Excluding " + artifactId + " from the shaded jar." );
         }
         for ( String artifactId : pomArtifacts )
         {
             getLog().info( "Skipping pom dependency " + artifactId + " in the shaded jar." );
         }
         for ( String artifactId : emptySourceArtifacts )
         {
             getLog().warn( "Skipping empty source jar " + artifactId + "." );
         }
         for ( String artifactId : emptyTestArtifacts )
         {
             getLog().warn( "Skipping empty test jar " + artifactId + "." );
         }
         for ( String artifactId : emptyTestArtifacts )
         {
             getLog().warn( "Skipping empty test source jar " + artifactId + "." );
         }
     }
 
     private boolean invalidMainArtifact()
     {
         return project.getArtifact().getFile() == null || !project.getArtifact().getFile().isFile();
     }
 
     private void replaceFile( File oldFile, File newFile )
         throws MojoExecutionException
     {
         getLog().info( "Replacing " + oldFile + " with " + newFile );
 
         File origFile = new File( outputDirectory, "original-" + oldFile.getName() );
         if ( oldFile.exists() && !oldFile.renameTo( origFile ) )
         {
             // try a gc to see if an unclosed stream needs garbage collecting
             System.gc();
             System.gc();
 
             if ( !oldFile.renameTo( origFile ) )
             {
                 // Still didn't work. We'll do a copy
                 try
                 {
                     copyFiles( oldFile, origFile );
                 }
                 catch ( IOException ex )
                 {
                     // kind of ignorable here. We're just trying to save the original
                     getLog().warn( ex );
                 }
             }
         }
         if ( !newFile.renameTo( oldFile ) )
         {
             // try a gc to see if an unclosed stream needs garbage collecting
             System.gc();
             System.gc();
 
             if ( !newFile.renameTo( oldFile ) )
             {
                 // Still didn't work. We'll do a copy
                 try
                 {
                     copyFiles( newFile, oldFile );
                 }
                 catch ( IOException ex )
                 {
                     throw new MojoExecutionException( "Could not replace original artifact with shaded artifact!", ex );
                 }
             }
         }
     }
 
     private void copyFiles( File source, File target )
         throws IOException
     {
         try ( InputStream in = new FileInputStream( source );
               OutputStream out = new FileOutputStream( target ) )
         {
             IOUtil.copy( in, out );
         }
     }
 
     private File resolveArtifactForClassifier( Artifact artifact, String classifier )
     {
         DefaultArtifactCoordinate coordinate = new DefaultArtifactCoordinate();
         coordinate.setGroupId( artifact.getGroupId() );
         coordinate.setArtifactId( artifact.getArtifactId() );
         coordinate.setVersion( artifact.getVersion() );
         coordinate.setExtension( "jar" );
         coordinate.setClassifier( classifier );
 
         Artifact resolvedArtifact;
         try
         {
             resolvedArtifact =
                 artifactResolver.resolveArtifact( session.getProjectBuildingRequest(), coordinate ).getArtifact();
         }
         catch ( ArtifactResolverException e )
         {
             getLog().warn( "Could not get " + classifier + " for " + artifact );
             return null;
         }
 
         if ( resolvedArtifact.isResolved() )
         {
             return resolvedArtifact.getFile();
         }
         return null;
     }
 
     private List<Relocator> getRelocators()
     {
         List<Relocator> relocators = new ArrayList<>();
 
         if ( relocations == null )
         {
             return relocators;
         }
 
         for ( PackageRelocation r : relocations )
         {
             relocators.add( new SimpleRelocator( r.getPattern(), r.getShadedPattern(), r.getIncludes(), r.getExcludes(),
                                                  r.isRawString() ) );
         }
 
         return relocators;
     }
 
     private List<ResourceTransformer> getResourceTransformers()
     {
         if ( transformers == null )
         {
             return Collections.emptyList();
         }
 
         return Arrays.asList( transformers );
     }
 
     private List<Filter> getFilters()
         throws MojoExecutionException
     {
         List<Filter> filters = new ArrayList<>();
         List<SimpleFilter> simpleFilters = new ArrayList<>();
 
         if ( this.filters != null && this.filters.length > 0 )
         {
             Map<Artifact, ArtifactId> artifacts = new HashMap<>();
 
             artifacts.put( project.getArtifact(), new ArtifactId( project.getArtifact() ) );
 
             for ( Artifact artifact : project.getArtifacts() )
             {
                 artifacts.put( artifact, new ArtifactId( artifact ) );
             }
 
             for ( ArchiveFilter filter : this.filters )
             {
                 ArtifactId pattern = new ArtifactId( filter.getArtifact() );
 
                 Set<File> jars = new HashSet<>();
 
                 for ( Map.Entry<Artifact, ArtifactId> entry : artifacts.entrySet() )
                 {
                     if ( entry.getValue().matches( pattern ) )
                     {
                         Artifact artifact = entry.getKey();
 
                         jars.add( artifact.getFile() );
 
                         if ( createSourcesJar )
                         {
                             File file = resolveArtifactForClassifier( artifact, "sources" );
                             if ( file != null )
                             {
                                 jars.add( file );
                             }
                         }
 
                         if ( shadeTestJar )
                         {
                             File file = resolveArtifactForClassifier( artifact, "tests" );
                             if ( file != null )
                             {
                                 jars.add( file );
                             }
                         }
                     }
                 }
 
                 if ( jars.isEmpty() )
                 {
                     getLog().info( "No artifact matching filter " + filter.getArtifact() );
 
                     continue;
                 }
 
                 simpleFilters.add( new SimpleFilter( jars, filter ) );
             }
         }
 
         filters.addAll( simpleFilters );
 
         if ( minimizeJar )
         {
             getLog().info( "Minimizing jar " + project.getArtifact() );
 
             try
             {
                 filters.add( new MinijarFilter( project, getLog(), simpleFilters ) );
             }
             catch ( IOException e )
             {
                 throw new MojoExecutionException( "Failed to analyze class dependencies", e );
             }
         }
 
         return filters;
     }
 
     private File shadedArtifactFileWithClassifier()
     {
         Artifact artifact = project.getArtifact();
         final String shadedName = shadedArtifactId + "-" + artifact.getVersion() + "-" + shadedClassifierName + "."
             + artifact.getArtifactHandler().getExtension();
         return new File( outputDirectory, shadedName );
     }
 
     private File shadedSourceArtifactFileWithClassifier()
     {
         return shadedArtifactFileWithClassifier( "sources" );
     }
 
     private File shadedTestSourceArtifactFileWithClassifier()
     {
         return shadedArtifactFileWithClassifier( "test-sources" );
     }
 
     private File shadedArtifactFileWithClassifier( String classifier )
     {
         Artifact artifact = project.getArtifact();
         final String shadedName = shadedArtifactId + "-" + artifact.getVersion() + "-" + shadedClassifierName
             + "-" + classifier + "." + artifact.getArtifactHandler().getExtension();
         return new File( outputDirectory, shadedName );
     }
 
     private File shadedTestArtifactFileWithClassifier()
     {
         return shadedArtifactFileWithClassifier( "tests" );
     }
 
     private File shadedSourcesArtifactFile()
     {
         return shadedArtifactFile( "sources" );
     }
 
     private File shadedTestSourcesArtifactFile()
     {
         return shadedArtifactFile( "test-sources" );
     }
 
     private File shadedArtifactFile( String classifier )
     {
         Artifact artifact = project.getArtifact();
 
         String shadedName;
 
         if ( project.getBuild().getFinalName() != null )
         {
             shadedName = project.getBuild().getFinalName() + "-" + classifier + "."
                 + artifact.getArtifactHandler().getExtension();
         }
         else
         {
             shadedName = shadedArtifactId + "-" + artifact.getVersion() + "-" + classifier + "."
                 + artifact.getArtifactHandler().getExtension();
         }
 
         return new File( outputDirectory, shadedName );
     }
 
     private File shadedTestArtifactFile()
     {
         return shadedArtifactFile( "tests" );
     }
 
     // We need to find the direct dependencies that have been included in the uber JAR so that we can modify the
     // POM accordingly.
     private void createDependencyReducedPom( Set<String> artifactsToRemove )
         throws IOException, DependencyGraphBuilderException, ProjectBuildingException
     {
         List<Dependency> dependencies = new ArrayList<>();
 
         boolean modified = false;
 
         List<Dependency> transitiveDeps = new ArrayList<>();
 
         // NOTE: By using the getArtifacts() we get the completely evaluated artifacts
         // including the system scoped artifacts with expanded values of properties used.
         for ( Artifact artifact : project.getArtifacts() )
         {
             if ( "pom".equals( artifact.getType() ) )
             {
                 // don't include pom type dependencies in dependency reduced pom
                 continue;
             }
 
             // promote
             Dependency dep = createDependency( artifact );
 
             // we'll figure out the exclusions in a bit.
             transitiveDeps.add( dep );
         }
         List<Dependency> origDeps = project.getDependencies();
 
         if ( promoteTransitiveDependencies )
         {
             origDeps = transitiveDeps;
         }
 
         Model model = project.getOriginalModel();
         // MSHADE-185: We will remove all system scoped dependencies which usually
         // have some kind of property usage. At this time the properties within
         // such things are already evaluated.
         List<Dependency> originalDependencies = model.getDependencies();
         removeSystemScopedDependencies( artifactsToRemove, originalDependencies );
 
         for ( Dependency d : origDeps )
         {
             dependencies.add( d );
 
             String id = getId( d );
 
             if ( artifactsToRemove.contains( id ) )
             {
                 modified = true;
 
                 if ( keepDependenciesWithProvidedScope )
                 {
                     d.setScope( "provided" );
                 }
                 else
                 {
                     dependencies.remove( d );
                 }
             }
         }
 
         // MSHADE-155
         model.setArtifactId( shadedArtifactId );
 
         // MSHADE-185: We will add those system scoped dependencies
         // from the non interpolated original pom file. So we keep
         // things like this: <systemPath>${tools.jar}</systemPath> intact.
         addSystemScopedDependencyFromNonInterpolatedPom( dependencies, originalDependencies );
 
         // Check to see if we have a reduction and if so rewrite the POM.
         rewriteDependencyReducedPomIfWeHaveReduction( dependencies, modified, transitiveDeps, model );
     }
 
     private void rewriteDependencyReducedPomIfWeHaveReduction( List<Dependency> dependencies, boolean modified,
                                                                List<Dependency> transitiveDeps, Model model )
                                                                    throws IOException, ProjectBuildingException,
                                                                    DependencyGraphBuilderException
     {
         if ( modified )
         {
             for ( int loopCounter = 0; modified; loopCounter++ )
             {
 
                 model.setDependencies( dependencies );
 
                 if ( generateUniqueDependencyReducedPom )
                 {
                     dependencyReducedPomLocation =
                         File.createTempFile( "dependency-reduced-pom-", ".xml", project.getBasedir() );
                     project.getProperties().setProperty( "maven.shade.dependency-reduced-pom",
                                                          dependencyReducedPomLocation.getAbsolutePath() );
                 }
                 else
                 {
                     if ( dependencyReducedPomLocation == null )
                     {
                         // MSHADE-123: We can't default to 'target' because it messes up uses of ${project.basedir}
                         dependencyReducedPomLocation = new File( project.getBasedir(), "dependency-reduced-pom.xml" );
                     }
                 }
 
                 File f = dependencyReducedPomLocation;
                 // MSHADE-225 
                 // Works for now, maybe there's a better algorithm where no for-loop is required
                 if ( loopCounter == 0 )
                 {
                     getLog().info( "Dependency-reduced POM written at: " + f.getAbsolutePath() );
                 }
 
                 if ( f.exists() )
                 {
                     // noinspection ResultOfMethodCallIgnored
                     f.delete();
                 }
 
                 Writer w = WriterFactory.newXmlWriter( f );
 
                 String replaceRelativePath = null;
                 if ( model.getParent() != null )
                 {
                     replaceRelativePath = model.getParent().getRelativePath();
 
                 }
 
                 if ( model.getParent() != null )
                 {
                     File parentFile =
                         new File( project.getBasedir(), model.getParent().getRelativePath() ).getCanonicalFile();
                     if ( !parentFile.isFile() )
                     {
                         parentFile = new File( parentFile, "pom.xml" );
                     }
 
                     parentFile = parentFile.getCanonicalFile();
 
                     String relPath = RelativizePath.convertToRelativePath( parentFile, f );
                     model.getParent().setRelativePath( relPath );
                 }
 
                 try
                 {
                     PomWriter.write( w, model, true );
                 }
                 finally
                 {
                     if ( model.getParent() != null )
                     {
                         model.getParent().setRelativePath( replaceRelativePath );
                     }
                     w.close();
                 }
 
                 ProjectBuildingRequest projectBuildingRequest =
                     new DefaultProjectBuildingRequest( session.getProjectBuildingRequest() );
                 projectBuildingRequest.setLocalRepository( localRepository );
                 projectBuildingRequest.setRemoteRepositories( remoteArtifactRepositories );
 
                 ProjectBuildingResult result = projectBuilder.build( f, projectBuildingRequest );
 
                 getLog().debug( "updateExcludesInDeps()" );
                 modified = updateExcludesInDeps( result.getProject(), dependencies, transitiveDeps );
             }
 
             project.setFile( dependencyReducedPomLocation );
         }
     }
 
     private void removeSystemScopedDependencies( Set<String> artifactsToRemove, List<Dependency> originalDependencies )
     {
         for ( Dependency dependency : originalDependencies )
         {
             if ( dependency.getScope() != null && dependency.getScope().equalsIgnoreCase( "system" ) )
             {
                 artifactsToRemove.add( getId( dependency ) );
             }
         }
     }
 
     private void addSystemScopedDependencyFromNonInterpolatedPom( List<Dependency> dependencies,
                                                                   List<Dependency> originalDependencies )
     {
         for ( Dependency dependency : originalDependencies )
         {
             if ( dependency.getScope() != null && dependency.getScope().equalsIgnoreCase( "system" ) )
             {
                 dependencies.add( dependency );
             }
         }
     }
 
     private Dependency createDependency( Artifact artifact )
     {
         Dependency dep = new Dependency();
         dep.setArtifactId( artifact.getArtifactId() );
         if ( artifact.hasClassifier() )
         {
             dep.setClassifier( artifact.getClassifier() );
         }
         dep.setGroupId( artifact.getGroupId() );
         dep.setOptional( artifact.isOptional() );
         dep.setScope( artifact.getScope() );
         dep.setType( artifact.getType() );
         if ( useBaseVersion )
         {
             dep.setVersion( artifact.getBaseVersion() );
         }
         else
         {
             dep.setVersion( artifact.getVersion() );
         }
         return dep;
     }
 
     private String getId( Artifact artifact )
     {
         return getId( artifact.getGroupId(), artifact.getArtifactId(), artifact.getType(), artifact.getClassifier() );
     }
 
     private String getId( Dependency dependency )
     {
         return getId( dependency.getGroupId(), dependency.getArtifactId(), dependency.getType(),
                       dependency.getClassifier() );
     }
 
     private String getId( String groupId, String artifactId, String type, String classifier )
     {
         return groupId + ":" + artifactId + ":" + type + ":" + ( ( classifier != null ) ? classifier : "" );
     }
 
     public boolean updateExcludesInDeps( MavenProject project, List<Dependency> dependencies,
                                          List<Dependency> transitiveDeps )
                                              throws DependencyGraphBuilderException
     {
         MavenProject original = session.getProjectBuildingRequest().getProject();
         try
         {
             session.getProjectBuildingRequest().setProject( project );
             DependencyNode node = dependencyGraphBuilder
                 .buildDependencyGraph( session.getProjectBuildingRequest(), null );
             boolean modified = false;
             for ( DependencyNode n2 : node.getChildren() )
             {
                 for ( DependencyNode n3 : n2.getChildren() )
                 {
                     // check if it really isn't in the list of original dependencies. Maven
                     // prior to 2.0.8 may grab versions from transients instead of
                     // from the direct deps in which case they would be marked included
                     // instead of OMITTED_FOR_DUPLICATE
 
                     // also, if not promoting the transitives, level 2's would be included
                     boolean found = false;
                     for ( Dependency dep : transitiveDeps )
                     {
                         if ( getId( dep ).equals( getId( n3.getArtifact() ) ) )
                         {
                             found = true;
                             break;
                         }
                     }
 
                     // MSHADE-311: do not add exclusion for provided transitive dep
                     //       note: MSHADE-31 introduced the exclusion logic for promoteTransitiveDependencies=true,
                     //             but as of 3.2.1 promoteTransitiveDependencies has no effect for provided deps,
                     //             which makes this fix even possible (see also MSHADE-181)
                     if ( !found && !"provided".equals( n3.getArtifact().getScope() ) )
                     {
                         for ( Dependency dep : dependencies )
                         {
                             if ( getId( dep ).equals( getId( n2.getArtifact() ) ) )
                             {
                                 Exclusion exclusion = new Exclusion();
                                 exclusion.setArtifactId( n3.getArtifact().getArtifactId() );
                                 exclusion.setGroupId( n3.getArtifact().getGroupId() );
                                 dep.addExclusion( exclusion );
                                 modified = true;
                                 break;
                             }
                         }
                     }
                 }
             }
             return modified;
         }
         finally
         {
             // restore it
             session.getProjectBuildingRequest().setProject( original );
         }
     }
 
     private List<ResourceTransformer> toResourceTransformers(
             String shade, List<ResourceTransformer> resourceTransformers )
     {
          List<ResourceTransformer> forShade = new ArrayList<>();
          ManifestResourceTransformer lastMt = null;
          for ( ResourceTransformer transformer : resourceTransformers )
          {
              if ( !( transformer instanceof ManifestResourceTransformer )  )
              {
                  forShade.add( transformer );
              }
              else if ( ( ( ManifestResourceTransformer ) transformer ) .isForShade( shade ) )
              {
                  final ManifestResourceTransformer mt = (ManifestResourceTransformer) transformer;
                  if ( mt.isUsedForDefaultShading() && lastMt != null && !lastMt.isUsedForDefaultShading() )
                  {
                      continue; // skip, we already have a specific transformer
                  }
                  if ( !mt.isUsedForDefaultShading() && lastMt != null && lastMt.isUsedForDefaultShading() )
                  {
                      forShade.remove( lastMt );
                  }
                  else if ( !mt.isUsedForDefaultShading() && lastMt != null )
                  {
                      getLog().warn( "Ambiguous manifest transformer definition for '" + shade + "': "
                              + mt + " / " + lastMt );
                  }
                  if ( lastMt == null || !mt.isUsedForDefaultShading() )
                  {
                      lastMt = mt;
                  }
                  forShade.add( transformer );
              }
          }
          return forShade;
     }
 }