package org.apache.maven.plugin.checkstyle;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.net.URLClassLoader;
  import java.util.ArrayList;
  import java.util.Calendar;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Properties;
  import java.util.ResourceBundle;
  
  import org.apache.maven.artifact.DependencyResolutionRequiredException;
  import org.apache.maven.doxia.siterenderer.Renderer;
  import org.apache.maven.doxia.tools.SiteTool;
  import org.apache.maven.model.ReportPlugin;
  import org.apache.maven.plugin.checkstyle.rss.CheckstyleRssGenerator;
  import org.apache.maven.plugin.checkstyle.rss.CheckstyleRssGeneratorRequest;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.reporting.AbstractMavenReport;
  import org.apache.maven.reporting.MavenReportException;
  import org.codehaus.plexus.resource.ResourceManager;
  import org.codehaus.plexus.resource.loader.FileResourceCreationException;
  import org.codehaus.plexus.resource.loader.FileResourceLoader;
  import org.codehaus.plexus.util.FileUtils;
  import org.codehaus.plexus.util.PathTool;
  import org.codehaus.plexus.util.StringUtils;
  
  import com.puppycrawl.tools.checkstyle.Checker;
  import com.puppycrawl.tools.checkstyle.ConfigurationLoader;
  import com.puppycrawl.tools.checkstyle.DefaultConfiguration;
  import com.puppycrawl.tools.checkstyle.DefaultLogger;
  import com.puppycrawl.tools.checkstyle.PackageNamesLoader;
  import com.puppycrawl.tools.checkstyle.PropertiesExpander;
  import com.puppycrawl.tools.checkstyle.XMLLogger;
  import com.puppycrawl.tools.checkstyle.api.AuditListener;
  import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
  import com.puppycrawl.tools.checkstyle.api.Configuration;
  import com.puppycrawl.tools.checkstyle.api.FilterSet;
  import com.puppycrawl.tools.checkstyle.filters.SuppressionsLoader;
  
  /**
   * Perform a Checkstyle analysis, and generate a report on violations.
   *
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
   * @author <a href="mailto:joakim@erdfelt.com">Joakim Erdfelt</a>
   * @version $Id: CheckstyleReport.html 816654 2012-05-08 13:54:20Z hboutemy $
   * @goal checkstyle
   * @requiresDependencyResolution compile
   */
  public class CheckstyleReport
      extends AbstractMavenReport
  {
      public static final String PLUGIN_RESOURCES = "org/apache/maven/plugin/checkstyle";
  
      /**
       * @deprecated Remove with format parameter.
       */
      private static final Map FORMAT_TO_CONFIG_LOCATION;
  
      static
      {
          Map fmt2Cfg = new HashMap();
  
          fmt2Cfg.put( "sun", "config/sun_checks.xml" );
          fmt2Cfg.put( "turbine", "config/turbine_checks.xml" );
          fmt2Cfg.put( "avalon", "config/avalon_checks.xml" );
         fmt2Cfg.put( "maven", "config/maven_checks.xml" );
 
         FORMAT_TO_CONFIG_LOCATION = Collections.unmodifiableMap( fmt2Cfg );
     }
 
     /**
      * Skip entire check.
      *
      * @parameter expression="${checkstyle.skip}" default-value="false"
      * @since 2.2
      */
     private boolean skip;
 
     /**
      * The output directory for the report. Note that this parameter is only
      * evaluated if the goal is run directly from the command line. If the goal
      * is run indirectly as part of a site generation, the output directory
      * configured in Maven Site Plugin is used instead.
      *
      * @parameter default-value="${project.reporting.outputDirectory}"
      * @required
      */
     private File outputDirectory;
 
     /**
      * Specifies if the Rules summary should be enabled or not.
      *
      * @parameter expression="${checkstyle.enable.rules.summary}"
      *            default-value="true"
      */
     private boolean enableRulesSummary;
 
     /**
      * Specifies if the Severity summary should be enabled or not.
      *
      * @parameter expression="${checkstyle.enable.severity.summary}"
      *            default-value="true"
      */
     private boolean enableSeveritySummary;
 
     /**
      * Specifies if the Files summary should be enabled or not.
      *
      * @parameter expression="${checkstyle.enable.files.summary}"
      *            default-value="true"
      */
     private boolean enableFilesSummary;
 
     /**
      * Specifies if the RSS should be enabled or not.
      *
      * @parameter expression="${checkstyle.enable.rss}" default-value="true"
      */
     private boolean enableRSS;
 
     /**
      * Specifies the names filter of the source files to be used for Checkstyle.
      *
      * @parameter expression="${checkstyle.includes}" default-value="**\/*.java"
      * @required
      */
     private String includes;
 
     /**
      * Specifies the names filter of the source files to be excluded for
      * Checkstyle.
      *
      * @parameter expression="${checkstyle.excludes}"
      */
     private String excludes;
 
     /**
      * <p>
      * Specifies the location of the XML configuration to use.
      * </p>
      *
      * <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="http://checkstyle.sourceforge.net/config.html#Modules">Checker
      * module</a>) configuration of rulesets.
      * </p>
      *
      * <p>
      * This parameter is resolved as resource, URL, then file. If successfully
      * resolved, the contents of the configuration is copied into the
      * <code>${project.build.directory}/checkstyle-configuration.xml</code>
      * file before being passed to Checkstyle as a configuration.
      * </p>
      *
      * <p>
      * There are 4 predefined rulesets.
      * </p>
      *
      * <ul>
      * <li><code>config/sun_checks.xml</code>: Sun Checks.</li>
      * <li><code>config/turbine_checks.xml</code>: Turbine Checks.</li>
      * <li><code>config/avalon_checks.xml</code>: Avalon Checks.</li>
      * <li><code>config/maven_checks.xml</code>: Maven Source Checks.</li>
      * </ul>
      *
      * @parameter expression="${checkstyle.config.location}"
      *            default-value="config/sun_checks.xml"
      */
     private String configLocation;
 
     /**
      * Specifies what predefined check set to use. Available sets are "sun" (for
      * the Sun coding conventions), "turbine", and "avalon".
      *
      * @parameter default-value="sun"
      * @deprecated Use configLocation instead.
      */
     private String format;
 
     /**
      * <p>
      * Specifies the location of the properties file.
      * </p>
      *
      * <p>
      * This parameter is resolved as URL, File then resource. If successfully
      * resolved, the contents of the properties location is copied into the
      * <code>${project.build.directory}/checkstyle-checker.properties</code>
      * file before being passed to Checkstyle for loading.
      * </p>
      *
      * <p>
      * The contents of the <code>propertiesLocation</code> will be made
      * available to Checkstyle for specifying values for parameters within the
      * xml configuration (specified in the <code>configLocation</code>
      * parameter).
      * </p>
      *
      * @parameter expression="${checkstyle.properties.location}"
      * @since 2.0-beta-2
      */
     private String propertiesLocation;
 
     /**
      * Specifies the location of the Checkstyle properties file that will be used to
      * check the source.
      *
      * @parameter
      * @deprecated Use propertiesLocation instead.
      */
     private File propertiesFile;
 
     /**
      * Specifies the URL of the Checkstyle properties that will be used to check
      * the source.
      *
      * @parameter
      * @deprecated Use propertiesLocation instead.
      */
     private URL propertiesURL;
 
     /**
      * Allows for specifying raw property expansion information.
      *
      * @parameter
      */
     private String propertyExpansion;
 
     /**
      * <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>
      * <p>
      * You need to use ${checkstyle.header.file} in your Checkstyle xml
      * configuration to reference the name of this header file.
      * </p>
      * <p>
      * For instance:
      * </p>
      * <p>
      * <code>
      * &lt;module name="RegexpHeader">
      *   &lt;property name="headerFile" value="${checkstyle.header.file}"/>
      * &lt;/module>
      * </code>
      * </p>
      *
      * @parameter expression="${checkstyle.header.file}"
      *            default-value="LICENSE.txt"
      * @since 2.0-beta-2
      */
     private String headerLocation;
 
     /**
      * Specifies the location of the License file (a.k.a. the header file) that
      * is used by Checkstyle to verify that source code has the correct
      * license header.
      *
      * @parameter expression="${basedir}/LICENSE.txt"
      * @deprecated Use headerLocation instead.
      */
     private File headerFile;
 
     /**
      * Specifies the cache file used to speed up Checkstyle on successive runs.
      *
      * @parameter default-value="${project.build.directory}/checkstyle-cachefile"
      */
     private String cacheFile;
 
     /**
      * 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;
 
     /**
      * SiteTool.
      *
      * @since 2.2
      * @component role="org.apache.maven.doxia.tools.SiteTool"
      * @required
      * @readonly
      */
     protected SiteTool siteTool;
 
     /**
      * <p>
      * Specifies the location of the suppressions XML file to use.
      * </p>
      *
      * <p>
      * This parameter is resolved as resource, URL, then file. If successfully
      * resolved, the contents of the suppressions XML is copied into the
      * <code>${project.build.directory}/checkstyle-supressions.xml</code> file
      * before being passed to Checkstyle for loading.
      * </p>
      *
      * <p>
      * See <code>suppressionsFileExpression</code> for the property that will
      * be made available to your checkstyle configuration.
      * </p>
      *
      * @parameter expression="${checkstyle.suppressions.location}"
      * @since 2.0-beta-2
      */
     private String suppressionsLocation;
 
     /**
      * The key to be used in the properties for the suppressions file.
      *
      * @parameter expression="${checkstyle.suppression.expression}"
      *            default-value="checkstyle.suppressions.file"
      * @since 2.1
      */
     private String suppressionsFileExpression;
 
     /**
      * Specifies the location of the suppressions XML file to use. The plugin
      * defines a Checkstyle property named
      * <code>checkstyle.suppressions.file</code> with the value of this
      * property. This allows using the Checkstyle property in your own custom
      * checkstyle configuration file when specifying a suppressions file.
      *
      * @parameter
      * @deprecated Use suppressionsLocation instead.
      */
     private String suppressionsFile;
 
     /**
      * 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 expression="${checkstyle.output.file}"
      *            default-value="${project.build.directory}/checkstyle-result.xml"
      */
     private File outputFile;
 
     /**
      * Specifies the format of the output to be used when writing to the output
      * file. Valid values are "plain" and "xml".
      *
      * @parameter expression="${checkstyle.output.format}" default-value="xml"
      */
     private String outputFileFormat;
 
     /**
      * <p>
      * Specifies the location of the package names XML to be used to configure
      * the Checkstyle <a
      * href="http://checkstyle.sourceforge.net/config.html#Packages">Packages</a>.
      * </p>
      *
      * <p>
      * This parameter is resolved as resource, URL, then file. If resolved to a
      * resource, or a URL, the contents of the package names XML is copied into
      * the <code>${project.build.directory}/checkstyle-packagenames.xml</code>
      * file before being passed to Checkstyle for loading.
      * </p>
      *
      * @parameter
      * @since 2.0-beta-2
      */
     private String packageNamesLocation;
 
     /**
      * Specifies the location of the package names XML to be used to configure
      * Checkstyle.
      *
      * @parameter
      * @deprecated Use packageNamesLocation instead.
      */
     private String packageNamesFile;
 
     /**
      * Specifies if the build should fail upon a violation.
      *
      * @parameter default-value="false"
      */
     private boolean failsOnError;
 
     /**
      * Specifies the location of the source directory to be used for Checkstyle.
      *
      * @parameter default-value="${project.build.sourceDirectory}"
      * @required
      */
     private File sourceDirectory;
 
     /**
      * Specifies the location of the test source directory to be used for
      * Checkstyle.
      *
      * @parameter default-value="${project.build.testSourceDirectory}"
      * @since 2.2
      */
     private File testSourceDirectory;
 
     /**
      * Include or not the test source directory to be used for Checkstyle.
      *
      * @parameter default-value="${false}"
      * @since 2.2
      */
     private boolean includeTestSourceDirectory;
 
     /**
      * The Maven Project Object.
      *
      * @parameter default-value="${project}"
      * @required
      * @readonly
      */
     private MavenProject project;
 
     /**
      * Output errors to console.
      *
      * @parameter default-value="false"
      */
     private boolean consoleOutput;
 
     /**
      * Link the violation line numbers to the source xref. Will link
      * automatically if Maven JXR plugin is being used.
      *
      * @parameter expression="${linkXRef}" default-value="true"
      * @since 2.1
      */
     private boolean linkXRef;
 
     /**
      * Location of the Xrefs to link to.
      *
      * @parameter default-value="${project.reporting.outputDirectory}/xref"
      */
     private File xrefLocation;
 
     /**
      * The file encoding to use when reading the source files. If the property <code>project.build.sourceEncoding</code>
      * is not set, the platform default encoding is used. <strong>Note:</strong> This parameter always overrides the
      * property <code>charset</code> from Checkstyle's <code>TreeWalker</code> module.
      *
      * @parameter expression="${encoding}" default-value="${project.build.sourceEncoding}"
      * @since 2.2
      */
     private String encoding;
 
     /**
      * @component
      * @required
      * @readonly
      */
     private Renderer siteRenderer;
     
     private static final File[] EMPTY_FILE_ARRAY = new File[0];
 
     private ByteArrayOutputStream stringOutputStream;
 
     /**
      * @component
      * @required
      * @readonly
      */
     private ResourceManager locator;
     
     /**
      * CheckstyleRssGenerator.
      *
      * @since 2.4
      * @component role="org.apache.maven.plugin.checkstyle.rss.CheckstyleRssGenerator" role-hint="default"
      * @required
      * @readonly
      */
     protected CheckstyleRssGenerator checkstyleRssGenerator;    
 
     /** {@inheritDoc} */
     public String getName( Locale locale )
     {
         return getBundle( locale ).getString( "report.checkstyle.name" );
     }
 
     /** {@inheritDoc} */
     public String getDescription( Locale locale )
     {
         return getBundle( locale ).getString( "report.checkstyle.description" );
     }
 
     /** {@inheritDoc} */
     protected String getOutputDirectory()
     {
         return outputDirectory.getAbsolutePath();
     }
 
     /** {@inheritDoc} */
     protected MavenProject getProject()
     {
         return project;
     }
 
     /** {@inheritDoc} */
     protected Renderer getSiteRenderer()
     {
         return siteRenderer;
     }
 
     /** {@inheritDoc} */
     public void executeReport( Locale locale )
         throws MavenReportException
     {
         if ( !skip )
         {
             mergeDeprecatedInfo();
 
             locator.addSearchPath( FileResourceLoader.ID, project.getFile().getParentFile().getAbsolutePath() );
             locator.addSearchPath( "url", "" );
 
             locator.setOutputDirectory( new File( project.getBuild().getDirectory() ) );
 
             if ( !canGenerateReport() )
             {
                 getLog().info( "Source directory does not exist - skipping report." );
                 return;
             }
 
             // 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() ) );
 
             ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
 
             try
             {
                 // checkstyle will always use the context classloader in order
                 // to load resources (dtds),
                 // so we have to fix it
                 ClassLoader checkstyleClassLoader = PackageNamesLoader.class.getClassLoader();
                 Thread.currentThread().setContextClassLoader( checkstyleClassLoader );
 
 
                 String configFile = getConfigFile();
                 Properties overridingProperties = getOverridingProperties();
                 Configuration config;
                 CheckstyleResults results;
 
                 config = ConfigurationLoader.loadConfiguration( configFile,
                                                                 new PropertiesExpander( overridingProperties ) );
                 String effectiveEncoding =
                     StringUtils.isNotEmpty( encoding ) ? encoding : System.getProperty( "file.encoding", "UTF-8" );
                 if ( StringUtils.isEmpty( encoding ) )
                 {
                     getLog().warn(
                                    "File encoding has not been set, using platform encoding " + effectiveEncoding
                                        + ", i.e. build is platform dependent!" );
                 }
                 Configuration[] modules = config.getChildren();
                 for ( int i = 0; i < modules.length; i++ )
                 {
                     Configuration module = modules[i];
                     if ( "Checker".equals( module.getName() )
                         || "com.puppycrawl.tools.checkstyle.Checker".equals( module.getName() ) )
                     {
                         if ( module instanceof DefaultConfiguration )
                         {
                             ( (DefaultConfiguration) module ).addAttribute( "charset", effectiveEncoding );
                         }
                         else
                         {
                             getLog().warn( "Failed to configure file encoding on module " + module );
                         }
                     }
                     if ("TreeWalker".equals(module.getName())
                         || "com.puppycrawl.tools.checkstyle.TreeWalker".equals(module.getName()))
                     {
                         if (module instanceof DefaultConfiguration)
                         {
                             ((DefaultConfiguration) module).addAttribute("cacheFile", cacheFile);
                         }
                         else
                         {
                             getLog().warn("Failed to configure cache file on module " + module);
                         }
                     }
                 }
 
                 results = executeCheckstyle( config );
 
                 ResourceBundle bundle = getBundle( locale );
                 generateReportStatics();
                 generateMainReport( results, config, bundle );
                 if ( enableRSS )
                 {
                     CheckstyleRssGeneratorRequest request =
                         new CheckstyleRssGeneratorRequest( this.project, this.getCopyright(), outputDirectory, getLog() );
                     checkstyleRssGenerator.generateRSS( results, request );
                 }
 
             }
             catch ( CheckstyleException e )
             {
                 throw new MavenReportException( "Failed during checkstyle configuration", e );
             }
             finally
             {
                 //be sure to restore original context classloader
                 Thread.currentThread().setContextClassLoader( currentClassLoader );
             }
         }
     }
 
     private void generateReportStatics()
         throws MavenReportException
     {
         ReportResource rresource = new ReportResource( PLUGIN_RESOURCES, outputDirectory );
         try
         {
             rresource.copy( "images/rss.png" );
         }
         catch ( IOException e )
         {
             throw new MavenReportException( "Unable to copy static resources.", e );
         }
     }
 
     
     private String getCopyright()
     {
         String copyright;
         int currentYear = Calendar.getInstance().get( Calendar.YEAR );
         if ( StringUtils.isNotEmpty( project.getInceptionYear() )
             && !String.valueOf( currentYear ).equals( project.getInceptionYear() ) )
         {
             copyright = project.getInceptionYear() + " - " + currentYear;
         }
         else
         {
             copyright = String.valueOf( currentYear );
         }
 
         if ( ( project.getOrganization() != null ) && StringUtils.isNotEmpty( project.getOrganization().getName() ) )
         {
             copyright = copyright + " " + project.getOrganization().getName();
         }
         return copyright;
     }
 
     private void generateMainReport( CheckstyleResults results, Configuration config, ResourceBundle bundle )
     {
         CheckstyleReportGenerator generator = new CheckstyleReportGenerator( getSink(), bundle, project.getBasedir(), siteTool );
 
         generator.setLog( getLog() );
         generator.setEnableRulesSummary( enableRulesSummary );
         generator.setEnableSeveritySummary( enableSeveritySummary );
         generator.setEnableFilesSummary( enableFilesSummary );
         generator.setEnableRSS( enableRSS );
         generator.setCheckstyleConfig( config );
         if ( linkXRef )
         {
             String relativePath = PathTool.getRelativePath( getOutputDirectory(), xrefLocation.getAbsolutePath() );
             if ( StringUtils.isEmpty( relativePath ) )
             {
                 relativePath = ".";
             }
             relativePath = relativePath + "/" + xrefLocation.getName();
             if ( xrefLocation.exists() )
             {
                 // XRef was already generated by manual execution of a lifecycle
                 // binding
                 generator.setXrefLocation( relativePath );
             }
             else
             {
                 // Not yet generated - check if the report is on its way
                 for ( Iterator reports = getProject().getReportPlugins().iterator(); reports.hasNext(); )
                 {
                     ReportPlugin report = (ReportPlugin) reports.next();
 
                     String artifactId = report.getArtifactId();
                     if ( "maven-jxr-plugin".equals( artifactId ) || "jxr-maven-plugin".equals( artifactId ) )
                     {
                         generator.setXrefLocation( relativePath );
                     }
                 }
             }
 
             if ( generator.getXrefLocation() == null )
             {
                 getLog().warn( "Unable to locate Source XRef to link to - DISABLED" );
             }
         }
         generator.generateReport( results );
     }
 
     /**
      * Merge in the deprecated parameters to the new ones, unless the new
      * parameters have values.
      *
      * @deprecated Remove when deprecated params are removed.
      */
     private void mergeDeprecatedInfo()
     {
         if ( "config/sun_checks.xml".equals( configLocation ) && !"sun".equals( format ) )
         {
             configLocation = (String) FORMAT_TO_CONFIG_LOCATION.get( format );
         }
 
         if ( StringUtils.isEmpty( propertiesLocation ) )
         {
             if ( propertiesFile != null )
             {
                 propertiesLocation = propertiesFile.getPath();
             }
             else if ( propertiesURL != null )
             {
                 propertiesLocation = propertiesURL.toExternalForm();
             }
         }
 
         if ( "LICENSE.txt".equals( headerLocation ) )
         {
             File defaultHeaderFile = new File( project.getBasedir(), "LICENSE.txt" );
             if ( !defaultHeaderFile.equals( headerFile ) )
             {
                 headerLocation = headerFile.getPath();
             }
         }
 
         if ( StringUtils.isEmpty( suppressionsLocation ) )
         {
             suppressionsLocation = suppressionsFile;
         }
 
         if ( StringUtils.isEmpty( packageNamesLocation ) )
         {
             packageNamesLocation = packageNamesFile;
         }
     }
 
     private CheckstyleResults executeCheckstyle( Configuration config )
         throws MavenReportException, CheckstyleException
     {
         File[] files;
         try
         {
             files = getFilesToProcess( includes, excludes );
         }
         catch ( IOException e )
         {
             throw new MavenReportException( "Error getting files to process", e );
         }
 
         FilterSet filterSet = getSuppressions();
 
         Checker checker = new Checker();
 
         // setup classloader, needed to avoid "Unable to get class information
         // for ..." errors
         List classPathStrings;
         List outputDirectories = new ArrayList();
         try
         {
             classPathStrings = this.project.getCompileClasspathElements();
             outputDirectories.add( this.project.getBuild().getOutputDirectory() );
 
             if ( includeTestSourceDirectory && ( testSourceDirectory != null ) && ( testSourceDirectory.exists() )
                 && ( testSourceDirectory.isDirectory() ) )
             {
                 classPathStrings = this.project.getTestClasspathElements();
                 outputDirectories.add( this.project.getBuild().getTestOutputDirectory() );
             }
         }
         catch ( DependencyResolutionRequiredException e )
         {
             throw new MavenReportException( e.getMessage(), e );
         }
 
         List urls = new ArrayList( classPathStrings.size() );
 
         Iterator iter = classPathStrings.iterator();
         while ( iter.hasNext() )
         {
             try
             {
                 urls.add( new File( ( (String) iter.next() ) ).toURL() );
             }
             catch ( MalformedURLException e )
             {
                 throw new MavenReportException( e.getMessage(), e );
             }
         }
 
         Iterator iterator = outputDirectories.iterator();
         while ( iterator.hasNext() )
         {
             try
             {
                 String outputDirectoryString = (String) iterator.next();
                 if ( outputDirectoryString != null )
                 {
                     File outputDirectoryFile = new File( outputDirectoryString );
                     if ( outputDirectoryFile.exists() )
                     {
                         URL outputDirectoryUrl = outputDirectoryFile.toURL();
                         getLog().debug( "Adding the outputDirectory " + outputDirectoryUrl.toString()
                             + " to the Checkstyle class path" );
                         urls.add( outputDirectoryUrl );
                     }
                 }
             }
             catch ( MalformedURLException e )
             {
                 throw new MavenReportException( e.getMessage(), e );
             }
         }
 
         URLClassLoader projectClassLoader = new URLClassLoader( (URL[]) urls.toArray( new URL[urls.size()] ), null );
         checker.setClassloader( projectClassLoader );
 
         checker.setModuleClassLoader( Thread.currentThread().getContextClassLoader() );
 
         if ( filterSet != null )
         {
             checker.addFilter( filterSet );
         }
 
         checker.configure( config );
 
         AuditListener listener = getListener();
 
         if ( listener != null )
         {
             checker.addListener( listener );
         }
 
         if ( consoleOutput )
         {
             checker.addListener( getConsoleListener() );
         }
 
         CheckstyleReportListener sinkListener = new CheckstyleReportListener( sourceDirectory );
         if ( includeTestSourceDirectory && ( testSourceDirectory != null ) && ( testSourceDirectory.exists() )
             && ( testSourceDirectory.isDirectory() ) )
         {
             sinkListener.addSourceDirectory( testSourceDirectory );
         }
 
         checker.addListener( sinkListener );
 
         ArrayList filesList = new ArrayList();
         for (int i = 0; i < files.length; i++) {
             filesList.add(files[i]);
         }
         int nbErrors = checker.process( filesList );
 
         checker.destroy();
 
         if ( stringOutputStream != null )
         {
             getLog().info( stringOutputStream.toString() );
         }
 
         if ( failsOnError && nbErrors > 0 )
         {
             // TODO: should be a failure, not an error. Report is not meant to
             // throw an exception here (so site would
             // work regardless of config), but should record this information
             throw new MavenReportException( "There are " + nbErrors + " checkstyle errors." );
         }
         else if ( nbErrors > 0 )
         {
             getLog().info( "There are " + nbErrors + " checkstyle errors." );
         }
 
         return sinkListener.getResults();
     }
 
     /** {@inheritDoc} */
     public String getOutputName()
     {
         return "checkstyle";
     }
 
     private AuditListener getListener()
         throws MavenReportException
     {
         AuditListener listener = null;
 
         if ( StringUtils.isNotEmpty( outputFileFormat ) )
         {
             File resultFile = outputFile;
 
             OutputStream out = getOutputStream( resultFile );
 
             if ( "xml".equals( outputFileFormat ) )
             {
                 listener = new XMLLogger( out, true );
             }
             else if ( "plain".equals( outputFileFormat ) )
             {
                 listener = new DefaultLogger( out, true );
             }
             else
             {
                 // TODO: failure if not a report
                 throw new MavenReportException( "Invalid output file format: (" + outputFileFormat
                     + "). Must be 'plain' 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;
     }
 
     private File[] getFilesToProcess( String includes, String excludes )
         throws IOException
     {
         StringBuffer excludesStr = new StringBuffer();
 
         if ( StringUtils.isNotEmpty( excludes ) )
         {
             excludesStr.append( excludes );
         }
 
         String[] defaultExcludes = FileUtils.getDefaultExcludes();
         for ( int i = 0; i < defaultExcludes.length; i++ )
         {
             if ( excludesStr.length() > 0 )
             {
                 excludesStr.append( "," );
             }
 
             excludesStr.append( defaultExcludes[i] );
         }
 
         List files = FileUtils.getFiles( sourceDirectory, includes, excludesStr.toString() );
         if ( includeTestSourceDirectory && ( testSourceDirectory != null ) && ( testSourceDirectory.exists() )
             && ( testSourceDirectory.isDirectory() ) )
         {
             files.addAll( FileUtils.getFiles( testSourceDirectory, includes, excludesStr.toString() ) );
         }
 
         return (File[]) files.toArray( EMPTY_FILE_ARRAY );
     }
 
     private Properties getOverridingProperties()
         throws MavenReportException
     {
         Properties p = new Properties();
 
         try
         {
             File propertiesFile = locator.resolveLocation( propertiesLocation, "checkstyle-checker.properties" );
 
             if ( propertiesFile != null )
             {
                 p.load( new FileInputStream( propertiesFile ) );
             }
 
             if ( StringUtils.isNotEmpty( propertyExpansion ) )
             {
                 // Convert \ to \\, so that p.load will convert it back properly
                 propertyExpansion = StringUtils.replace( propertyExpansion, "\\", "\\\\" );
                 p.load( new ByteArrayInputStream( propertyExpansion.getBytes() ) );
             }
 
             // Workaround for MCHECKSTYLE-48
             // Make sure that "config/maven-header.txt" is the default value
             // for headerLocation, if configLocation="config/maven_checks.xml"
             if ( "config/maven_checks.xml".equals( configLocation ) )
             {
                 if ( "LICENSE.txt".equals( headerLocation ) )
                 {
                     headerLocation = "config/maven-header.txt";
                 }
             }
             if ( StringUtils.isNotEmpty( headerLocation ) )
             {
                 try
                 {
                     File headerFile = locator.resolveLocation( headerLocation, "checkstyle-header.txt" );
 
                     if ( headerFile != null )
                     {
                         p.setProperty( "checkstyle.header.file", headerFile.getAbsolutePath() );
                     }
                 }
                 catch ( IOException e )
                 {
                     throw new MavenReportException( "Unable to process header location: " + headerLocation, e );
                 }
             }
 
             if ( cacheFile != null )
             {
                 p.setProperty( "checkstyle.cache.file", cacheFile );
             }
         }
         catch ( IOException e )
         {
             throw new MavenReportException( "Failed to get overriding properties", e );
         }
 
         if ( suppressionsFileExpression != null )
         {
             String suppresionFile = getSuppressionLocation();
 
             if ( suppresionFile != null )
             {
                 p.setProperty( suppressionsFileExpression, suppresionFile );
             }
         }
 
         return p;
     }
 
     private String getConfigFile()
         throws MavenReportException
     {
         try
         {
             File configFile = locator.getResourceAsFile( configLocation, "checkstyle-checker.xml" );
 
             if ( configFile == null )
             {
                 throw new MavenReportException( "Unable to process config location: " + configLocation );
             }
             return configFile.getAbsolutePath();
         }
         catch ( org.codehaus.plexus.resource.loader.ResourceNotFoundException e )
         {
             throw new MavenReportException( "Unable to find configuration file at location "
                                             + configLocation, e );
         }
         catch ( FileResourceCreationException e )
         {
             throw new MavenReportException( "Unable to process configuration file location "
                                             + configLocation, e );
         }
 
     }
 
     private String getSuppressionLocation()
         throws MavenReportException
     {
         try
         {
             File suppressionsFile = locator.resolveLocation( suppressionsLocation, "checkstyle-suppressions.xml" );
 
             if ( suppressionsFile == null )
             {
                 return null;
             }
 
             return suppressionsFile.getAbsolutePath();
         }
         catch ( IOException e )
         {
             throw new MavenReportException( "Failed to process supressions location: " + suppressionsLocation, e );
         }
     }
 
     private FilterSet getSuppressions()
         throws MavenReportException
     {
         try
         {
             File suppressionsFile = locator.resolveLocation( suppressionsLocation, "checkstyle-suppressions.xml" );
 
             if ( suppressionsFile == null )
             {
                 return null;
             }
 
             return SuppressionsLoader.loadSuppressions( suppressionsFile.getAbsolutePath() );
         }
         catch ( CheckstyleException ce )
         {
             throw new MavenReportException( "failed to load suppressions location: " + suppressionsLocation, ce );
         }
         catch ( IOException e )
         {
             throw new MavenReportException( "Failed to process supressions location: " + suppressionsLocation, e );
         }
     }
 
     private DefaultLogger getConsoleListener()
         throws MavenReportException
     {
         DefaultLogger consoleListener;
 
         if ( useFile == null )
         {
             stringOutputStream = new ByteArrayOutputStream();
             consoleListener = new DefaultLogger( stringOutputStream, false );
         }
         else
         {
             OutputStream out = getOutputStream( useFile );
 
             consoleListener = new DefaultLogger( out, true );
         }
 
         return consoleListener;
     }
 
     private static ResourceBundle getBundle( Locale locale )
     {
         return ResourceBundle.getBundle( "checkstyle-report", locale, CheckstyleReport.class.getClassLoader() );
     }
 
     /** {@inheritDoc} */
     public boolean canGenerateReport()
     {
         // TODO: would be good to scan the files here
         return sourceDirectory.exists();
     }
 
     /** {@inheritDoc} */
     public void setReportOutputDirectory( File reportOutputDirectory )
     {
         super.setReportOutputDirectory( reportOutputDirectory );
         this.outputDirectory = reportOutputDirectory;
     }
 }