/*
    * 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.
   */
  package org.apache.maven.plugins.checkstyle;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  import com.puppycrawl.tools.checkstyle.DefaultLogger;
  import com.puppycrawl.tools.checkstyle.SarifLogger;
  import com.puppycrawl.tools.checkstyle.XMLLogger;
  import com.puppycrawl.tools.checkstyle.api.AuditListener;
  import com.puppycrawl.tools.checkstyle.api.AutomaticBean.OutputStreamOptions;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.model.PluginManagement;
  import org.apache.maven.model.Resource;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.checkstyle.exec.CheckstyleExecutor;
  import org.apache.maven.plugins.checkstyle.exec.CheckstyleExecutorException;
  import org.apache.maven.plugins.checkstyle.exec.CheckstyleExecutorRequest;
  import org.apache.maven.plugins.checkstyle.exec.CheckstyleResults;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.reporting.AbstractMavenReport;
  import org.apache.maven.reporting.MavenReportException;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  import org.codehaus.plexus.i18n.I18N;
  import org.codehaus.plexus.resource.ResourceManager;
  import org.codehaus.plexus.resource.loader.FileResourceLoader;
  import org.codehaus.plexus.util.FileUtils;
  import org.codehaus.plexus.util.PathTool;
  
  /**
   * Base abstract class for Checkstyle reports.
   *
   *
   */
  public abstract class AbstractCheckstyleReport extends AbstractMavenReport {
      protected static final String JAVA_FILES = "**\\/*.java";
  
      private static final String DEFAULT_CONFIG_LOCATION = "sun_checks.xml";
  
      @Parameter(defaultValue = "${session}", readonly = true, required = true)
      private MavenSession session;
  
      /**
       * Specifies the cache file used to speed up Checkstyle on successive runs.
       */
      @Parameter(defaultValue = "${project.build.directory}/checkstyle-cachefile")
      protected String cacheFile;
  
      /**
       * <p>
       * Specifies the location of the XML configuration to use.
       * <p>
       * Potential values are a filesystem path, a URL, or a classpath resource.
       * This parameter expects that the contents of the location conform to the
       * xml format (Checkstyle <a
       * href="https://checkstyle.org/config.html#Modules">Checker
       * module</a>) configuration of rulesets.
       * <p>
       * This parameter is resolved as resource, URL, then file. If successfully
       * resolved, the contents of the configuration is copied into the
       * <code>${project.build.directory}/checkstyle-configuration.xml</code>
       * file before being passed to Checkstyle as a configuration.
       * <p>
       * There are 2 predefined rulesets included in Maven Checkstyle Plugin:
       * <ul>
       * <li><code>sun_checks.xml</code>: Sun Checks.</li>
      * <li><code>google_checks.xml</code>: Google Checks.</li>
      * </ul>
      */
     @Parameter(property = "checkstyle.config.location", defaultValue = DEFAULT_CONFIG_LOCATION)
     protected String configLocation;
 
     /**
      * Output errors to console.
      */
     @Parameter(property = "checkstyle.consoleOutput", defaultValue = "false")
     protected boolean consoleOutput;
 
     /**
      * Specifies if the build should fail upon a violation.
      */
     @Parameter(defaultValue = "false")
     protected boolean failsOnError;
 
     /**
      * <p>
      * Specifies the location of the License file (a.k.a. the header file) that
      * can be used by Checkstyle to verify that source code has the correct
      * license header.
      * <p>
      * You need to use <code>${checkstyle.header.file}</code> in your Checkstyle xml
      * configuration to reference the name of this header file.
      * <p>
      * For instance:
      * <pre>
      * &lt;module name="RegexpHeader"&gt;
      *   &lt;property name="headerFile" value="${checkstyle.header.file}"/&gt;
      * &lt;/module&gt;
      * </pre>
      *
      * @since 2.0-beta-2
      */
     @Parameter(property = "checkstyle.header.file", defaultValue = "LICENSE.txt")
     protected String headerLocation;
 
     /**
      * Skip entire check.
      *
      * @since 2.2
      */
     @Parameter(property = "checkstyle.skip", defaultValue = "false")
     protected boolean skip;
 
     /**
      * Specifies the path and filename to save the Checkstyle output. The format
      * of the output file is determined by the <code>outputFileFormat</code>
      * parameter.
      */
     @Parameter(property = "checkstyle.output.file", defaultValue = "${project.build.directory}/checkstyle-result.xml")
     private File outputFile;
 
     /**
      * <p>
      * Specifies the location of the properties file.
      * <p>
      * This parameter is resolved as URL, File then resource. If successfully
      * resolved, the contents of the properties location is copied into the
      * <code>${project.build.directory}/checkstyle-checker.properties</code>
      * file before being passed to Checkstyle for loading.
      * <p>
      * The contents of the <code>propertiesLocation</code> will be made
      * available to Checkstyle for specifying values for parameters within the
      * xml configuration (specified in the <code>configLocation</code>
      * parameter).
      *
      * @since 2.0-beta-2
      */
     @Parameter(property = "checkstyle.properties.location")
     protected String propertiesLocation;
 
     /**
      * Allows for specifying raw property expansion information.
      */
     @Parameter
     protected String propertyExpansion;
 
     /**
      * Specifies the location of the resources to be used for Checkstyle.
      *
      * @since 2.10
      */
     @Parameter(defaultValue = "${project.resources}", readonly = true)
     protected List<Resource> resources;
 
     /**
      * Specifies the location of the test resources to be used for Checkstyle.
      *
      * @since 2.11
      */
     @Parameter(defaultValue = "${project.testResources}", readonly = true)
     protected List<Resource> testResources;
 
     /**
      * Specifies the names filter of the source files to be used for Checkstyle.
      */
     @Parameter(property = "checkstyle.includes", defaultValue = JAVA_FILES, required = true)
     protected String includes;
 
     /**
      * Specifies the names filter of the source files to be excluded for
      * Checkstyle.
      */
     @Parameter(property = "checkstyle.excludes")
     protected String excludes;
 
     /**
      * Specifies the names filter of the resource files to be used for Checkstyle.
      * @since 2.11
      */
     @Parameter(property = "checkstyle.resourceIncludes", defaultValue = "**/*.properties", required = true)
     protected String resourceIncludes;
 
     /**
      * Specifies the names filter of the resource files to be excluded for
      * Checkstyle.
      * @since 2.11
      */
     @Parameter(property = "checkstyle.resourceExcludes")
     protected String resourceExcludes;
 
     /**
      * Specifies whether to include the resource directories in the check.
      * @since 2.11
      */
     @Parameter(property = "checkstyle.includeResources", defaultValue = "true", required = true)
     protected boolean includeResources;
 
     /**
      * Specifies whether to include the test resource directories in the check.
      * @since 2.11
      */
     @Parameter(property = "checkstyle.includeTestResources", defaultValue = "true", required = true)
     protected boolean includeTestResources;
 
     /**
      * Specifies the location of the source directory to be used for Checkstyle.
      *
      * @deprecated instead use {@link #sourceDirectories}. For version 3.0.0, this parameter is only defined to break
      *             the build if you use it!
      */
     @Deprecated
     @Parameter
     private File sourceDirectory;
 
     /**
      * Specifies the location of the source directories to be used for Checkstyle.
      * Default value is <code>${project.compileSourceRoots}</code>.
      * @since 2.13
      */
     // Compatibility with all Maven 3: default of 'project.compileSourceRoots' is done manually because of MNG-5440
     @Parameter
     private List<String> sourceDirectories;
 
     /**
      * Specifies the location of the test source directory to be used for Checkstyle.
      *
      * @since 2.2
      * @deprecated instead use {@link #testSourceDirectories}. For version 3.0.0, this parameter is only defined to
      *             break the build if you use it!
      */
     @Parameter
     @Deprecated
     private File testSourceDirectory;
 
     /**
      * Specifies the location of the test source directories to be used for Checkstyle.
      * Default value is <code>${project.testCompileSourceRoots}</code>.
      * @since 2.13
      */
     // Compatibility with all Maven 3: default of 'project.testCompileSourceRoots' is done manually because of MNG-5440
     @Parameter
     private List<String> testSourceDirectories;
 
     /**
      * Include or not the test source directory/directories to be used for Checkstyle.
      *
      * @since 2.2
      */
     @Parameter(defaultValue = "false")
     protected boolean includeTestSourceDirectory;
 
     /**
      * The key to be used in the properties for the suppressions file.
      *
      * @since 2.1
      */
     @Parameter(property = "checkstyle.suppression.expression", defaultValue = "checkstyle.suppressions.file")
     protected String suppressionsFileExpression;
 
     /**
      * <p>
      * Specifies the location of the suppressions XML file to use.
      * <p>
      * This parameter is resolved as resource, URL, then file. If successfully
      * resolved, the contents of the suppressions XML is copied into the
      * <code>${project.build.directory}/checkstyle-supressions.xml</code> file
      * before being passed to Checkstyle for loading.
      * <p>
      * See <code>suppressionsFileExpression</code> for the property that will
      * be made available to your Checkstyle configuration.
      *
      * @since 2.0-beta-2
      */
     @Parameter(property = "checkstyle.suppressions.location")
     protected String suppressionsLocation;
 
     /**
      * If <code>null</code>, the Checkstyle plugin will display violations on stdout.
      * Otherwise, a text file will be created with the violations.
      */
     @Parameter
     private File useFile;
 
     /**
      * Specifies the format of the output to be used when writing to the output
      * file. Valid values are "<code>plain</code>", "<code>sarif</code>" and "<code>xml</code>".
      */
     @Parameter(property = "checkstyle.output.format", defaultValue = "xml")
     private String outputFileFormat;
 
     /**
      * Specifies if the Rules summary should be enabled or not.
      */
     @Parameter(property = "checkstyle.enable.rules.summary", defaultValue = "true")
     private boolean enableRulesSummary;
 
     /**
      * Specifies if the Severity summary should be enabled or not.
      */
     @Parameter(property = "checkstyle.enable.severity.summary", defaultValue = "true")
     private boolean enableSeveritySummary;
 
     /**
      * Specifies if the Files summary should be enabled or not.
      */
     @Parameter(property = "checkstyle.enable.files.summary", defaultValue = "true")
     private boolean enableFilesSummary;
 
     /**
      * The Plugin Descriptor
      */
     @Parameter(defaultValue = "${plugin}", readonly = true, required = true)
     private PluginDescriptor plugin;
 
     /**
      * Link the violation line numbers to the (Test) Source XRef. Links will be created automatically if the JXR plugin is
      * being used.
      *
      * @since 2.1
      */
     @Parameter(property = "linkXRef", defaultValue = "true")
     private boolean linkXRef;
 
     /**
      * Location where Source XRef is generated for this project.
      * <br>
      * <strong>Default</strong>: {@link #getReportOutputDirectory()} + {@code /xref}
      */
     @Parameter
     private File xrefLocation;
 
     /**
      * Location where Test Source XRef is generated for this project.
      * <br>
      * <strong>Default</strong>: {@link #getReportOutputDirectory()} + {@code /xref-test}
      */
     @Parameter
     private File xrefTestLocation;
 
     /**
      * When using custom treeWalkers, specify their names here so the checks
      * inside the treeWalker end up the the rule-summary.
      *
      * @since 2.11
      */
     @Parameter
     private List<String> treeWalkerNames;
 
     /**
      * Specifies whether modules with a configured severity of <code>ignore</code> should be omitted during Checkstyle
      * invocation.
      *
      * @since 3.0.0
      */
     @Parameter(defaultValue = "false")
     private boolean omitIgnoredModules;
 
     /**
      * By using this property, you can specify the whole Checkstyle rules
      * inline directly inside this pom.
      *
      * <pre>
      * &lt;plugin&gt;
      *   ...
      *   &lt;configuration&gt;
      *     &lt;checkstyleRules&gt;
      *       &lt;module name="Checker"&gt;
      *         &lt;module name="FileTabCharacter"&gt;
      *           &lt;property name="eachLine" value="true" /&gt;
      *         &lt;/module&gt;
      *         &lt;module name="TreeWalker"&gt;
      *           &lt;module name="EmptyBlock"/&gt;
      *         &lt;/module&gt;
      *       &lt;/module&gt;
      *     &lt;/checkstyleRules&gt;
      *   &lt;/configuration&gt;
      *   ...
      * </pre>
      *
      * @since 2.12
      */
     @Parameter
     private PlexusConfiguration checkstyleRules;
 
     /**
      * Dump file for inlined Checkstyle rules.
      */
     @Parameter(
             property = "checkstyle.output.rules.file",
             defaultValue = "${project.build.directory}/checkstyle-rules.xml")
     private File rulesFiles;
 
     /**
      * The header to use for the inline configuration.
      * Only used when you specify {@code checkstyleRules}.
      */
     @Parameter(
             defaultValue = "<?xml version=\"1.0\"?>\n"
                     + "<!DOCTYPE module PUBLIC \"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN\"\n"
                     + "        \"https://checkstyle.org/dtds/configuration_1_3.dtd\">\n")
     private String checkstyleRulesHeader;
 
     /**
      * Specifies whether generated source files should be excluded from Checkstyle.
      *
      * @since 3.3.1
      */
     @Parameter(property = "checkstyle.excludeGeneratedSources", defaultValue = "false")
     private boolean excludeGeneratedSources;
 
     /**
      */
     @Component
     protected ResourceManager locator;
 
     /**
      * @since 2.5
      */
     @Component(role = CheckstyleExecutor.class, hint = "default")
     protected CheckstyleExecutor checkstyleExecutor;
 
     /**
      * Internationalization component
      */
     @Component
     private I18N i18n;
 
     protected ByteArrayOutputStream stringOutputStream;
 
     /** {@inheritDoc} */
     public String getName(Locale locale) {
         return getI18nString(locale, "name");
     }
 
     /** {@inheritDoc} */
     public String getDescription(Locale locale) {
         return getI18nString(locale, "description");
     }
 
     /**
      * @param locale The locale
      * @param key The key to search for
      * @return The text appropriate for the locale.
      */
     protected String getI18nString(Locale locale, String key) {
         return i18n.getString("checkstyle-report", locale, "report.checkstyle." + key);
     }
 
     protected MavenProject getProject() {
         return project;
     }
 
     protected List<MavenProject> getReactorProjects() {
         return reactorProjects;
     }
 
     /** {@inheritDoc} */
     public void executeReport(Locale locale) throws MavenReportException {
         checkDeprecatedParameterUsage(sourceDirectory, "sourceDirectory", "sourceDirectories");
         checkDeprecatedParameterUsage(testSourceDirectory, "testSourceDirectory", "testSourceDirectories");
 
         locator.addSearchPath(
                 FileResourceLoader.ID, project.getFile().getParentFile().getAbsolutePath());
         locator.addSearchPath("url", "");
 
         locator.setOutputDirectory(new File(project.getBuild().getDirectory()));
 
         // for when we start using maven-shared-io and maven-shared-monitor...
         // locator = new Locator( new MojoLogMonitorAdaptor( getLog() ) );
 
         // locator = new Locator( getLog(), new File( project.getBuild().getDirectory() ) );
         String effectiveConfigLocation = configLocation;
         if (checkstyleRules != null) {
             if (!DEFAULT_CONFIG_LOCATION.equals(configLocation)) {
                 throw new MavenReportException(
                         "If you use inline configuration for rules, don't specify " + "a configLocation");
             }
             if (checkstyleRules.getChildCount() > 1) {
                 throw new MavenReportException("Currently only one root module is supported");
             }
             PlexusConfiguration checkerModule = checkstyleRules.getChild(0);
 
             try {
                 FileUtils.forceMkdir(rulesFiles.getParentFile());
                 FileUtils.fileWrite(rulesFiles, checkstyleRulesHeader + checkerModule.toString());
             } catch (final IOException e) {
                 throw new MavenReportException(e.getMessage(), e);
             }
             effectiveConfigLocation = rulesFiles.getAbsolutePath();
         }
         ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
 
         try {
             CheckstyleExecutorRequest request = createRequest()
                     .setLicenseArtifacts(collectArtifacts("license"))
                     .setConfigurationArtifacts(collectArtifacts("configuration"))
                     .setOmitIgnoredModules(omitIgnoredModules)
                     .setConfigLocation(effectiveConfigLocation);
 
             CheckstyleResults results = checkstyleExecutor.executeCheckstyle(request);
 
             CheckstyleReportRenderer r = new CheckstyleReportRenderer(
                     getSink(),
                     i18n,
                     locale,
                     project,
                     siteTool,
                     effectiveConfigLocation,
                     linkXRef ? constructXrefLocation(xrefLocation, false) : null,
                     linkXRef ? constructXrefLocation(xrefTestLocation, true) : null,
                     linkXRef ? getTestSourceDirectories() : Collections.emptyList(),
                     enableRulesSummary,
                     enableSeveritySummary,
                     enableFilesSummary,
                     results);
             if (treeWalkerNames != null) {
                 r.setTreeWalkerNames(treeWalkerNames);
             }
             r.render();
         } catch (CheckstyleException e) {
             throw new MavenReportException("Failed during checkstyle configuration", e);
         } catch (CheckstyleExecutorException e) {
             throw new MavenReportException("Failed during checkstyle execution", e);
         } finally {
             // be sure to restore original context classloader
             Thread.currentThread().setContextClassLoader(currentClassLoader);
         }
     }
 
     private void checkDeprecatedParameterUsage(Object parameter, String name, String replacement)
             throws MavenReportException {
         if (parameter != null) {
             throw new MavenReportException("You are using '" + name + "' which has been removed"
                     + " from the maven-checkstyle-plugin. " + "Please use '" + replacement
                     + "' and refer to the >>Major Version Upgrade to version 3.0.0<< " + "on the plugin site.");
         }
     }
 
     /**
      * Create the Checkstyle executor request.
      *
      * @return The executor request.
      * @throws MavenReportException If something goes wrong during creation.
      */
     protected abstract CheckstyleExecutorRequest createRequest() throws MavenReportException;
 
     private List<Artifact> collectArtifacts(String hint) {
         List<Artifact> artifacts = new ArrayList<>();
 
         PluginManagement pluginManagement = project.getBuild().getPluginManagement();
         if (pluginManagement != null) {
             artifacts.addAll(getCheckstylePluginDependenciesAsArtifacts(pluginManagement.getPluginsAsMap(), hint));
         }
 
         artifacts.addAll(
                 getCheckstylePluginDependenciesAsArtifacts(project.getBuild().getPluginsAsMap(), hint));
 
         return artifacts;
     }
 
     private List<Artifact> getCheckstylePluginDependenciesAsArtifacts(Map<String, Plugin> plugins, String hint) {
         List<Artifact> artifacts = new ArrayList<>();
 
         Plugin checkstylePlugin = plugins.get(plugin.getGroupId() + ":" + plugin.getArtifactId());
         if (checkstylePlugin != null) {
             for (Dependency dep : checkstylePlugin.getDependencies()) {
                 // @todo if we can filter on hints, it should be done here...
                 String depKey = dep.getGroupId() + ":" + dep.getArtifactId();
                 artifacts.add(plugin.getArtifactMap().get(depKey));
             }
         }
         return artifacts;
     }
 
     /**
      * Creates and returns the report generation listener.
      *
      * @return The audit listener.
      * @throws MavenReportException If something goes wrong.
      */
     protected AuditListener getListener() throws MavenReportException {
         AuditListener listener = null;
 
         if (outputFileFormat != null && !outputFileFormat.isEmpty()) {
             File resultFile = outputFile;
 
             OutputStream out = getOutputStream(resultFile);
 
             if ("xml".equals(outputFileFormat)) {
                 listener = new XMLLogger(out, OutputStreamOptions.CLOSE);
             } else if ("plain".equals(outputFileFormat)) {
                 listener = new DefaultLogger(out, OutputStreamOptions.CLOSE);
             } else if ("sarif".equals(outputFileFormat)) {
                 try {
                     listener = new SarifLogger(out, OutputStreamOptions.CLOSE);
                 } catch (IOException e) {
                     throw new MavenReportException("Failed to create SarifLogger", e);
                 }
             } else {
                 // TODO: failure if not a report
                 throw new MavenReportException(
                         "Invalid output file format: (" + outputFileFormat + "). Must be 'plain', 'sarif' or 'xml'.");
             }
         }
 
         return listener;
     }
 
     private OutputStream getOutputStream(File file) throws MavenReportException {
         File parentFile = file.getAbsoluteFile().getParentFile();
 
         if (!parentFile.exists()) {
             parentFile.mkdirs();
         }
 
         FileOutputStream fileOutputStream;
         try {
             fileOutputStream = new FileOutputStream(file);
         } catch (FileNotFoundException e) {
             throw new MavenReportException("Unable to create output stream: " + file, e);
         }
         return fileOutputStream;
     }
 
     /**
      * Creates and returns the console listener.
      *
      * @return The console listener.
      * @throws MavenReportException If something goes wrong.
      */
     protected DefaultLogger getConsoleListener() throws MavenReportException {
         DefaultLogger consoleListener;
 
         if (useFile == null) {
             stringOutputStream = new ByteArrayOutputStream();
             consoleListener = new DefaultLogger(stringOutputStream, OutputStreamOptions.NONE);
         } else {
             OutputStream out = getOutputStream(useFile);
 
             consoleListener = new DefaultLogger(out, OutputStreamOptions.CLOSE);
         }
 
         return consoleListener;
     }
 
     private String determineRelativePath(File location) {
         String relativePath =
                 PathTool.getRelativePath(getReportOutputDirectory().getAbsolutePath(), location.getAbsolutePath());
         if (relativePath == null || relativePath.trim().isEmpty()) {
             relativePath = ".";
         }
 
         return relativePath + "/" + location.getName();
     }
 
     protected List<File> getSourceDirectories() {
         if (sourceDirectories == null) {
             sourceDirectories = filterBuildTarget(project.getCompileSourceRoots());
         }
         List<File> sourceDirs = new ArrayList<>(sourceDirectories.size());
         for (String sourceDir : sourceDirectories) {
             sourceDirs.add(FileUtils.resolveFile(project.getBasedir(), sourceDir));
         }
         return sourceDirs;
     }
 
     protected List<File> getTestSourceDirectories() {
         if (testSourceDirectories == null) {
             testSourceDirectories = filterBuildTarget(project.getTestCompileSourceRoots());
         }
         List<File> testSourceDirs = new ArrayList<>(testSourceDirectories.size());
         for (String testSourceDir : testSourceDirectories) {
             testSourceDirs.add(FileUtils.resolveFile(project.getBasedir(), testSourceDir));
         }
         return testSourceDirs;
     }
 
     private List<String> filterBuildTarget(List<String> sourceDirectories) {
         if (!excludeGeneratedSources) {
             return sourceDirectories;
         }
 
         List<String> filtered = new ArrayList<>(sourceDirectories.size());
         Path buildTarget = FileUtils.resolveFile(
                         project.getBasedir(), project.getBuild().getDirectory())
                 .toPath();
 
         for (String sourceDir : sourceDirectories) {
             Path src = FileUtils.resolveFile(project.getBasedir(), sourceDir).toPath();
             if (!src.startsWith(buildTarget)) {
                 filtered.add(sourceDir);
             }
         }
         return filtered;
     }
 }