/*
    * Copyright (C) 2011 the original author or authors.
    *
    * Licensed 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.codehaus.gmavenplus.mojo;
  
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.shared.model.fileset.FileSet;
  import org.apache.maven.shared.model.fileset.util.FileSetManager;
  import org.codehaus.gmavenplus.groovyworkarounds.GroovyDocTemplateInfo;
  import org.codehaus.gmavenplus.javaparser.LanguageLevel;
  import org.codehaus.gmavenplus.model.IncludeClasspath;
  import org.codehaus.gmavenplus.model.Link;
  import org.codehaus.gmavenplus.model.Scopes;
  import org.codehaus.gmavenplus.model.internal.Version;
  import org.codehaus.gmavenplus.util.FileUtils;
  
  import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.OutputStreamWriter;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.net.MalformedURLException;
  import java.nio.file.Files;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Properties;
  
  import static org.codehaus.gmavenplus.util.ReflectionUtils.findConstructor;
  import static org.codehaus.gmavenplus.util.ReflectionUtils.findMethod;
  import static org.codehaus.gmavenplus.util.ReflectionUtils.invokeConstructor;
  import static org.codehaus.gmavenplus.util.ReflectionUtils.invokeMethod;
  
  
  /**
   * The base GroovyDoc mojo, which all GroovyDoc mojos extend.
   *
   * @author Keegan Witt
   * @since 1.0-beta-1
   */
  public abstract class AbstractGroovyDocMojo extends AbstractGroovySourcesMojo {
  
      /**
       * Groovy 5.0.0-beta-1 version.
       */
      protected static final Version GROOVY_5_0_0_BETA_1 = new Version(5, 0, 0, "beta-1");
  
      /**
       * Groovy 5.0.0-alpha-1 version.
       */
      protected static final Version GROOVY_5_0_0_ALPHA_1 = new Version(5, 0, 0, "alpha-1");
  
      /**
       * Groovy 4.0.27 version.
       */
      protected static final Version GROOVY_4_0_27 = new Version(4, 0, 27);
  
      /**
       * Groovy 3.0.0 alpha-4 version.
       */
      protected static final Version GROOVY_3_0_0_ALPHA_4 = new Version(3, 0, 0, "alpha-4");
  
      /**
       * Groovy 1.6.0 RC-2 version.
       */
      protected static final Version GROOVY_1_6_0_RC2 = new Version(1, 6, 0, "RC-2");
  
      /**
       * Groovy 1.6.0 RC-1 version.
       */
      protected static final Version GROOVY_1_6_0_RC1 = new Version(1, 6, 0, "RC-1");
  
      /**
       * Groovy 1.5.8 version.
       */
      protected static final Version GROOVY_1_5_8 = new Version(1, 5, 8);
  
      /**
       * Groovy 1.5.2 version.
       */
      protected static final Version GROOVY_1_5_2 = new Version(1, 5, 2);
  
      /**
       * The window title.
      */
     @Parameter(defaultValue = "Groovy Documentation")
     protected String windowTitle;
 
     /**
      * The page title.
      */
     @Parameter(defaultValue = "Groovy Documentation")
     protected String docTitle;
 
     /**
      * The page footer.
      */
     @Parameter(defaultValue = "Groovy Documentation")
     protected String footer;
 
     /**
      * The Java language level to use for GroovyDoc generation.
      */
     @Parameter
     protected LanguageLevel languageLevel;
 
     /**
      * The page header.
      */
     @Parameter(defaultValue = "Groovy Documentation")
     protected String header;
 
     /**
      * Whether to display the author in the generated GroovyDoc.
      */
     @Parameter(defaultValue = "true")
     protected boolean displayAuthor;
 
     /**
      * The HTML file to be used for overview documentation.
      */
     @Parameter
     protected File overviewFile;
 
     /**
      * The stylesheet file (absolute path) to copy to output directory (will overwrite default stylesheet.css).
      */
     @Parameter
     protected File stylesheetFile;
 
     /**
      * The encoding of stylesheetFile.
      */
     @Parameter(defaultValue = "${project.build.sourceEncoding}")
     protected String stylesheetEncoding;
 
     /**
      * The scope to generate GroovyDoc for. Should be one of:
      * <ul>
      *   <li>"public"</li>
      *   <li>"protected"</li>
      *   <li>"package"</li>
      *   <li>"private"</li>
      * </ul>
      */
     @Parameter(defaultValue = "private")
     protected String scope;
 
     /**
      * Links to include in the generated GroovyDoc (key is link href, value is comma-separated packages to use that link).
      *
      * @since 1.0-beta-2
      */
     @Parameter
     protected List<Link> links;
 
     /**
      * Flag to allow GroovyDoc generation to be skipped.
      *
      * @since 1.6
      */
     @Parameter(property = "skipGroovydoc", defaultValue = "false")
     protected boolean skipGroovyDoc;
 
     /**
      * What classpath to include. One of
      * <ul>
      *   <li>PROJECT_ONLY</li>
      *   <li>PROJECT_AND_PLUGIN</li>
      *   <li>PLUGIN_ONLY</li>
      * </ul>
      * Uses the same scope as the required dependency resolution of this mojo. Use only if you know what you're doing.
      *
      * @since 1.8.0
      */
     @Parameter(defaultValue = "PROJECT_ONLY")
     protected IncludeClasspath includeClasspath;
 
     /**
      * Override the default Groovydoc default top-level templates. Uses Groovy's standard templates by default.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String[] defaultDocTemplates = null;
 
     /**
      * Override the default Groovydoc package-level templates. Uses Groovy's standard templates by default.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String[] defaultPackageTemplates = null;
 
     /**
      * Override the default Groovydoc class-level templates. Uses Groovy's standard templates by default.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String[] defaultClassTemplates = null;
 
     /**
      * Allows you to override the class that is normally org.codehaus.groovy.tools.groovydoc.GroovyDocTool, for use when
      * creating custom GroovyDoc implementations.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String groovyDocToolClass = null;
 
     /**
      * Allows you to override the class that is normally org.codehaus.groovy.tools.groovydoc.OutputTool, for use when
      * creating custom GroovyDoc implementations.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String outputToolClass = null;
 
     /**
      * Allows you to override the class that is normally org.codehaus.groovy.tools.groovydoc.FileOutputTool, for use
      * when creating custom GroovyDoc implementations.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String fileOutputToolClass = null;
 
     /**
      * Allows you to override the class that is normally org.codehaus.groovy.tools.groovydoc.ResourceManager, for use
      * when creating custom GroovyDoc implementations.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String resourceManagerClass = null;
 
     /**
      * Allows you to override the class that is normally org.codehaus.groovy.tools.groovydoc.ClasspathResourceManager,
      * for use when creating custom GroovyDoc implementations.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String classpathResourceManagerClass = null;
 
     /**
      * Allows you to override the class that is normally org.codehaus.groovy.tools.groovydoc.LinkArgument (or
      * org.codehaus.groovy.ant.Groovydoc$LinkArgument for Groovy older than 1.6-RC-2), for use when creating custom
      * GroovyDoc implementations.
      *
      * @since 1.10.1
      */
     @Parameter
     protected String linkArgumentClass = null;
 
     /**
      * Enable attaching GroovyDoc annotation. Requires Groovy 3.0.0 alpha-4 or newer.
      *
      * @since 1.11.0
      */
     @Parameter(defaultValue = "false")
     protected boolean attachGroovyDocAnnotation;
 
     /**
      * Generates the GroovyDoc for the specified sources.
      *
      * @param sourceDirectories The source directories to generate GroovyDoc for
      * @param classpath         The classpath to use for compilation
      * @param outputDirectory   The directory to save the generated GroovyDoc in
      * @throws ClassNotFoundException    when a class needed for GroovyDoc generation cannot be found
      * @throws InstantiationException    when a class needed for GroovyDoc generation cannot be instantiated
      * @throws IllegalAccessException    when a method needed for GroovyDoc generation cannot be accessed
      * @throws InvocationTargetException when a reflection invocation needed for GroovyDoc generation cannot be completed
      * @throws MalformedURLException     when a classpath element provides a malformed URL
      */
     protected synchronized void doGroovyDocGeneration(final FileSet[] sourceDirectories, final List<?> classpath, final File outputDirectory) throws ClassNotFoundException, InvocationTargetException, IllegalAccessException, InstantiationException, MalformedURLException {
         if (skipGroovyDoc) {
             getLog().info("Skipping generation of GroovyDoc because ${skipGroovydoc} was set to true.");
             return;
         }
 
         if (sourceDirectories == null || sourceDirectories.length == 0) {
             getLog().info("No source directories specified for GroovyDoc generation. Skipping.");
             return;
         }
 
         setupClassWrangler(classpath, includeClasspath);
 
         classWrangler.logGroovyVersion(mojoExecution.getMojoDescriptor().getGoal());
         logPluginClasspath();
 
         if (!groovyVersionSupportsAction()) {
             getLog().error("Your Groovy version (" + classWrangler.getGroovyVersionString() + ") doesn't support GroovyDoc. The minimum version of Groovy required is " + minGroovyVersion + ". Skipping GroovyDoc generation.");
             return;
         }
         if (groovyIs(GROOVY_1_6_0_RC1) || groovyIs(GROOVY_1_5_8)) {
             // Groovy 1.5.8 and 1.6-RC-1 are blacklisted because of their dependency on org.apache.tools.ant.types.Path in GroovyDocTool constructor
             getLog().warn("Groovy " + GROOVY_1_5_8 + " and " + GROOVY_1_6_0_RC1 + " are blacklisted from the supported GroovyDoc versions because of their dependency on Ant. Skipping GroovyDoc generation.");
             return;
         }
 
         // get classes we need with reflection
         Class<?> groovyDocToolClass = classWrangler.getClass(this.groovyDocToolClass == null ? "org.codehaus.groovy.tools.groovydoc.GroovyDocTool" : this.groovyDocToolClass);
         Class<?> outputToolClass = classWrangler.getClass(this.outputToolClass == null ? "org.codehaus.groovy.tools.groovydoc.OutputTool" : this.outputToolClass);
         Class<?> fileOutputToolClass = classWrangler.getClass(this.fileOutputToolClass == null ? "org.codehaus.groovy.tools.groovydoc.FileOutputTool" : this.fileOutputToolClass);
         Class<?> resourceManagerClass = classWrangler.getClass(this.resourceManagerClass == null ? "org.codehaus.groovy.tools.groovydoc.ResourceManager" : this.resourceManagerClass);
         Class<?> classpathResourceManagerClass = classWrangler.getClass(this.classpathResourceManagerClass == null ? "org.codehaus.groovy.tools.groovydoc.ClasspathResourceManager" : this.classpathResourceManagerClass);
 
         // set up GroovyDoc options
         if (attachGroovyDocAnnotation) {
             if (groovyAtLeast(GROOVY_3_0_0_ALPHA_4)) {
                 System.setProperty("runtimeGroovydoc", "true");
             } else {
                 getLog().warn("Requested to enable attaching GroovyDoc annotation, but your Groovy version (" + classWrangler.getGroovyVersionString() + ") doesn't support it (must be " + GROOVY_3_0_0_ALPHA_4 + " or newer). Ignoring enableGroovyDocAnnotation parameter.");
             }
         }
         Properties docProperties = setupProperties();
         Object fileOutputTool = invokeConstructor(findConstructor(fileOutputToolClass));
         Object classpathResourceManager = invokeConstructor(findConstructor(classpathResourceManagerClass));
         FileSetManager fileSetManager = new FileSetManager();
         List<String> sourceDirectoriesStrings = new ArrayList<>();
         for (FileSet sourceDirectory : sourceDirectories) {
             sourceDirectoriesStrings.add(sourceDirectory.getDirectory());
         }
         GroovyDocTemplateInfo groovyDocTemplateInfo = new GroovyDocTemplateInfo(classWrangler.getGroovyVersion());
         List<?> groovyDocLinks = setupLinks();
         if (groovyOlderThan(GROOVY_1_6_0_RC2)) {
             getLog().warn("Your Groovy version (" + classWrangler.getGroovyVersionString() + ") doesn't support GroovyDoc documentation properties (docTitle, footer, header, displayAuthor, overviewFile, and scope). You need Groovy 1.6-RC-2 or newer to support this. Ignoring properties.");
         }
 
         // prevent Java stubs (which lack Javadoc) from overwriting GroovyDoc by removing Java sources
         List<String> groovyDocSources = setupGroovyDocSources(sourceDirectories, fileSetManager);
 
         // instantiate GroovyDocTool
         Object groovyDocTool = createGroovyDocTool(groovyDocToolClass, resourceManagerClass, docProperties, classpathResourceManager, sourceDirectoriesStrings, groovyDocTemplateInfo, groovyDocLinks);
 
         // generate GroovyDoc
         generateGroovyDoc(outputDirectory, groovyDocToolClass, outputToolClass, fileOutputTool, groovyDocSources, groovyDocTool);
 
         // overwrite stylesheet.css with provided stylesheet (if configured)
         if (stylesheetFile != null) {
             copyStylesheet(outputDirectory);
         }
     }
 
     /**
      * Sets up the documentation properties.
      *
      * @return the documentation properties
      */
     protected Properties setupProperties() {
         Properties properties = new Properties();
         properties.setProperty("windowTitle", windowTitle);
         properties.setProperty("docTitle", docTitle);
         properties.setProperty("footer", footer);
         properties.setProperty("header", header);
         properties.setProperty("author", Boolean.toString(displayAuthor));
         properties.setProperty("overviewFile", overviewFile != null ? overviewFile.getAbsolutePath() : "");
         try {
             Scopes scopeVal = Scopes.valueOf(scope.toUpperCase());
             if (scopeVal.equals(Scopes.PUBLIC)) {
                 properties.setProperty("publicScope", "true");
             } else if (scopeVal.equals(Scopes.PROTECTED)) {
                 properties.setProperty("protectedScope", "true");
             } else if (scopeVal.equals(Scopes.PACKAGE)) {
                 properties.setProperty("packageScope", "true");
             } else if (scopeVal.equals(Scopes.PRIVATE)) {
                 properties.setProperty("privateScope", "true");
             }
         } catch (IllegalArgumentException e) {
             getLog().warn("Scope (" + scope + ") was not recognized. Skipping argument.");
         }
 
         return properties;
     }
 
     /**
      * Sets up the GroovyDoc links.
      *
      * @return the GroovyDoc links
      * @throws ClassNotFoundException    when a class needed for setting up GroovyDoc links cannot be found
      * @throws InstantiationException    when a class needed for setting up GroovyDoc links cannot be instantiated
      * @throws IllegalAccessException    when a method needed for setting up GroovyDoc links cannot be accessed
      * @throws InvocationTargetException when a reflection invocation needed for setting up GroovyDoc links cannot be completed
      */
     @SuppressWarnings({"rawtypes", "unchecked"})
     protected List<?> setupLinks() throws ClassNotFoundException, InvocationTargetException, IllegalAccessException, InstantiationException {
         List linksList = new ArrayList();
         if (links != null && !links.isEmpty()) {
             Class<?> linkArgumentClass = null;
             if (this.linkArgumentClass == null) {
                 if (groovyAtLeast(GROOVY_1_6_0_RC2)) {
                     linkArgumentClass = classWrangler.getClass("org.codehaus.groovy.tools.groovydoc.LinkArgument");
                 } else if (groovyAtLeast(GROOVY_1_5_2)) {
                     linkArgumentClass = classWrangler.getClass("org.codehaus.groovy.ant.Groovydoc$LinkArgument");
                 }
             } else {
                 linkArgumentClass = classWrangler.getClass(this.linkArgumentClass);
             }
             if (linkArgumentClass != null) {
                 Method setHref = findMethod(linkArgumentClass, "setHref", String.class);
                 Method setPackages = findMethod(linkArgumentClass, "setPackages", String.class);
                 for (Link link : links) {
                     Object linkArgument = invokeConstructor(findConstructor(linkArgumentClass));
                     invokeMethod(setHref, linkArgument, link.getHref());
                     invokeMethod(setPackages, linkArgument, link.getPackages());
                     linksList.add(linkArgument);
                 }
             } else {
                 getLog().warn("Requested to use GroovyDoc links, but your Groovy version (" + classWrangler.getGroovyVersionString() + ") doesn't support it (must be 1.5.2 or newer). Ignoring links parameter.");
             }
         }
 
         return linksList;
     }
 
     /**
      * Instantiates a new GroovyDocTool.
      *
      * @param groovyDocToolClass       the GroovyDocTool class
      * @param resourceManagerClass     the ResourceManager lass
      * @param docProperties            the documentation properties
      * @param classpathResourceManager the ClasspathResourceManager for the GroovyDocTool
      * @param sourceDirectories        the source directories for the GroovyDocTool
      * @param groovyDocTemplateInfo    the GroovyDocTemplateInfo for the GroovyDocTool
      * @param groovyDocLinks           the GroovyDoc links
      * @return the GroovyDocTool to use in GroovyDoc generation
      * @throws InstantiationException    when a class needed for setting up GroovyDoc tool cannot be instantiated
      * @throws IllegalAccessException    when a method needed for setting up GroovyDoc tool cannot be accessed
      * @throws InvocationTargetException when a reflection invocation needed for setting up GroovyDoc tool cannot be completed
      */
     protected Object createGroovyDocTool(final Class<?> groovyDocToolClass, final Class<?> resourceManagerClass, final Properties docProperties, final Object classpathResourceManager, final List<String> sourceDirectories, final GroovyDocTemplateInfo groovyDocTemplateInfo, final List<?> groovyDocLinks) throws InvocationTargetException, IllegalAccessException, InstantiationException {
         Object groovyDocTool;
         if ((groovyAtLeast(GROOVY_4_0_27) && groovyOlderThan(GROOVY_5_0_0_ALPHA_1)) || groovyAtLeast(GROOVY_5_0_0_BETA_1)) {
             groovyDocTool = invokeConstructor(findConstructor(groovyDocToolClass, resourceManagerClass, String[].class, String[].class, String[].class, String[].class, List.class, String.class, Properties.class),
                     classpathResourceManager,
                     sourceDirectories.toArray(new String[0]),
                     defaultDocTemplates == null ? groovyDocTemplateInfo.defaultDocTemplates() : defaultDocTemplates,
                     defaultPackageTemplates == null ? groovyDocTemplateInfo.defaultPackageTemplates() : defaultPackageTemplates,
                     defaultClassTemplates == null ? groovyDocTemplateInfo.defaultClassTemplates() : defaultClassTemplates,
                     groovyDocLinks,
                     languageLevel,
                     docProperties
             );
         } else if (groovyAtLeast(GROOVY_1_6_0_RC2)) {
             groovyDocTool = invokeConstructor(findConstructor(groovyDocToolClass, resourceManagerClass, String[].class, String[].class, String[].class, String[].class, List.class, Properties.class),
                     classpathResourceManager,
                     sourceDirectories.toArray(new String[0]),
                     defaultDocTemplates == null ? groovyDocTemplateInfo.defaultDocTemplates() : defaultDocTemplates,
                     defaultPackageTemplates == null ? groovyDocTemplateInfo.defaultPackageTemplates() : defaultPackageTemplates,
                     defaultClassTemplates == null ? groovyDocTemplateInfo.defaultClassTemplates() : defaultClassTemplates,
                     groovyDocLinks,
                     docProperties
             );
         } else if (groovyAtLeast(GROOVY_1_5_2)) {
             groovyDocTool = invokeConstructor(findConstructor(groovyDocToolClass, resourceManagerClass, String.class, String[].class, String[].class, String[].class, List.class),
                     classpathResourceManager,
                     sourceDirectories.get(0),
                     defaultDocTemplates == null ? groovyDocTemplateInfo.defaultDocTemplates() : defaultDocTemplates,
                     defaultPackageTemplates == null ? groovyDocTemplateInfo.defaultPackageTemplates() : defaultPackageTemplates,
                     defaultClassTemplates == null ? groovyDocTemplateInfo.defaultClassTemplates() : defaultClassTemplates,
                     groovyDocLinks
             );
             if (sourceDirectories.size() > 1) {
                 getLog().warn("Your Groovy version (" + classWrangler.getGroovyVersionString() + ") doesn't support more than one GroovyDoc source directory (must be 1.6-RC-2 or newer). Only using first source directory (" + sourceDirectories.get(0) + ").");
             }
         } else {
             groovyDocTool = invokeConstructor(findConstructor(groovyDocToolClass, resourceManagerClass, String.class, String[].class, String[].class, String[].class),
                     classpathResourceManager,
                     sourceDirectories.get(0),
                     defaultDocTemplates == null ? groovyDocTemplateInfo.defaultDocTemplates() : defaultDocTemplates,
                     defaultPackageTemplates == null ? groovyDocTemplateInfo.defaultPackageTemplates() : defaultPackageTemplates,
                     defaultClassTemplates == null ? groovyDocTemplateInfo.defaultClassTemplates() : defaultClassTemplates
             );
             if (sourceDirectories.size() > 1) {
                 getLog().warn("Your Groovy version (" + classWrangler.getGroovyVersionString() + ") doesn't support more than one GroovyDoc source directory (must be 1.6-RC-2 or newer). Only using first source directory (" + sourceDirectories.get(0) + ").");
             }
         }
 
         return groovyDocTool;
     }
 
     /**
      * Gets the Groovy sources without the Java sources (since the Java sources don't have Javadoc).
      *
      * @param sourceDirectories the source directories to get the Groovy sources from
      * @param fileSetManager    the FileSetmanager to use to get the included files
      * @return the groovy sources
      */
     protected List<String> setupGroovyDocSources(final FileSet[] sourceDirectories, final FileSetManager fileSetManager) {
         List<String> javaSources = new ArrayList<>();
         List<String> groovySources = new ArrayList<>();
         List<String> possibleGroovyStubs = new ArrayList<>();
         for (FileSet sourceDirectory : sourceDirectories) {
             String[] sources = fileSetManager.getIncludedFiles(sourceDirectory);
             for (String source : sources) {
                 if (source.endsWith(".java") && !javaSources.contains(source)) {
                     javaSources.add(source);
                 } else if (!groovySources.contains(source)) {
                     groovySources.add(source);
                     possibleGroovyStubs.add(source.replaceFirst("\\." + FileUtils.getFileExtension(source), ".java"));
                 }
             }
         }
         javaSources.removeAll(possibleGroovyStubs);
         List<String> groovyDocSources = new ArrayList<>();
         groovyDocSources.addAll(javaSources);
         groovyDocSources.addAll(groovySources);
 
         return groovyDocSources;
     }
 
     /**
      * Performs the GroovyDoc generation.
      *
      * @param outputDirectory    the directory to output the GroovyDoc to
      * @param groovyDocToolClass the GroovyDocTool class
      * @param outputToolClass    the OutputTool class
      * @param fileOutputTool     the FileOutputTool to use for GroovyDoc generation
      * @param groovyDocSources   the sources to
      * @param groovyDocTool      the GroovyDocTool to use for GroovyDoc generation
      * @throws IllegalAccessException    when a method needed for GroovyDoc generation cannot be accessed
      * @throws InvocationTargetException when a reflection invocation needed for GroovyDoc generation cannot be completed
      */
     protected void generateGroovyDoc(final File outputDirectory, final Class<?> groovyDocToolClass, final Class<?> outputToolClass, final Object fileOutputTool, final List<String> groovyDocSources, final Object groovyDocTool) throws InvocationTargetException, IllegalAccessException {
         getLog().debug("Adding sources to generate GroovyDoc for:");
         if (getLog().isDebugEnabled()) {
             for (String groovyDocSource : groovyDocSources) {
                 getLog().debug("    " + groovyDocSource);
             }
         }
         if (groovyAtLeast(GROOVY_1_6_0_RC2)) {
             invokeMethod(findMethod(groovyDocToolClass, "add", List.class), groovyDocTool, groovyDocSources);
         } else {
             Method add = findMethod(groovyDocToolClass, "add", String.class);
             for (String groovyDocSource : groovyDocSources) {
                 invokeMethod(add, groovyDocTool, groovyDocSource);
             }
         }
         invokeMethod(findMethod(groovyDocToolClass, "renderToOutput", outputToolClass, String.class), groovyDocTool, fileOutputTool, outputDirectory.getAbsolutePath());
     }
 
     /**
      * Copies the stylesheet to the specified output directory.
      *
      * @param outputDirectory The output directory to copy the stylesheet to
      */
     protected void copyStylesheet(final File outputDirectory) {
         getLog().info("Using stylesheet from " + stylesheetFile.getAbsolutePath() + ".");
         try {
             BufferedReader bufferedReader = null;
             BufferedWriter bufferedWriter = null;
             try {
                 if (stylesheetEncoding != null) {
                     bufferedReader = new BufferedReader(new InputStreamReader(Files.newInputStream(stylesheetFile.toPath()), stylesheetEncoding));
                 } else {
                     bufferedReader = new BufferedReader(new InputStreamReader(Files.newInputStream(stylesheetFile.toPath())));
                 }
                 StringBuilder css = new StringBuilder();
                 String line;
                 while ((line = bufferedReader.readLine()) != null) {
                     css.append(line).append("\n");
                 }
                 File outfile = new File(outputDirectory, "stylesheet.css");
                 if (stylesheetEncoding != null) {
                     bufferedWriter = new BufferedWriter(new OutputStreamWriter(Files.newOutputStream(outfile.toPath()), stylesheetEncoding));
                 } else {
                     bufferedWriter = new BufferedWriter(new OutputStreamWriter(Files.newOutputStream(outfile.toPath())));
                 }
                 bufferedWriter.write(css.toString());
             } finally {
                 FileUtils.closeQuietly(bufferedReader);
                 FileUtils.closeQuietly(bufferedWriter);
             }
         } catch (IOException e) {
             getLog().warn("Unable to copy specified stylesheet (" + stylesheetFile.getAbsolutePath() + ").");
         }
     }
 
 }