/*
    * #%L
    * License Maven Plugin
    * 
    * $Id: UpdateFileHeaderMojo.java 14741 2011-09-20 08:31:41Z tchemit $
    * $HeadURL: http://svn.codehaus.org/mojo/tags/license-maven-plugin-1.0/src/main/java/org/codehaus/mojo/license/UpdateFileHeaderMojo.java $
    * %%
    * Copyright (C) 2008 - 2011 CodeLutin, Codehaus, Tony Chemit
    * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as 
   * published by the Free Software Foundation, either version 3 of the 
   * License, or (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public 
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-3.0.html>.
   * #L%
   */
  
  package org.codehaus.mojo.license;
  
  import org.apache.commons.lang.StringUtils;
  import org.codehaus.mojo.license.header.*;
  import org.codehaus.mojo.license.header.transformer.FileHeaderTransformer;
  import org.codehaus.mojo.license.model.License;
  import org.codehaus.plexus.util.DirectoryScanner;
  import org.codehaus.plexus.util.FileUtils;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.*;
  
  /**
   * The goal to update (or add) the header on project source files.
   * <p/>
   * This goal replace the {@code update-header} goal which can not deal with
   * Copyright.
   * <p/>
   * This goal use a specific project file descriptor {@code project.xml} to
   * describe all files to update for a whole project.
   *
   * @author tchemit <chemit@codelutin.com>
   * @requiresProject true
   * @goal update-file-header
   * @since 1.0
   */
  public class UpdateFileHeaderMojo
      extends AbstractLicenseNameMojo
      implements FileHeaderProcessorConfiguration
  {
  
      /**
       * Name of project (or module).
       * <p/>
       * Will be used as description section of new header.
       *
       * @parameter expression="${license.projectName}" default-value="${project.name}"
       * @required
       * @since 1.0
       */
      protected String projectName;
  
      /**
       * Name of project's organization.
       * <p/>
       * Will be used as copyrigth's holder in new header.
       *
       * @parameter expression="${license.organizationName}" default-value="${project.organization.name}"
       * @required
       * @since 1.0
       */
      protected String organizationName;
  
      /**
       * Inception year of the project.
       * <p/>
       * Will be used as first year of copyright section in new header.
       *
       * @parameter expression="${license.inceptionYear}" default-value="${project.inceptionYear}"
       * @required
       * @since 1.0
       */
      protected String inceptionYear;
  
      /**
       * A flag to add svn:keywords on new header.
       * <p/>
       * Will add svn keywords :
       * <pre>Author, Id, Rev, URL and Date</pre>
       *
       * @parameter expression="${license.addSvnKeyWords}" default-value="false"
       * @since 1.0
       */
     protected boolean addSvnKeyWords;
 
     /**
      * A flag to authorize update of the description part of the header.
      * <p/>
      * <b>Note:</b> By default, do NOT authorize it since description can change
      * on each file).
      *
      * @parameter expression="${license.canUpdateDescription}" default-value="false"
      * @since 1.0
      */
     protected boolean canUpdateDescription;
 
     /**
      * A flag to authorize update of the copyright part of the header.
      * <p/>
      * <b>Note:</b> By default, do NOT authorize it since copyright part should be
      * handled by developpers (holder can change on each file for example).
      *
      * @parameter expression="${license.canUpdateCopyright}" default-value="false"
      * @since 1.0
      */
     protected boolean canUpdateCopyright;
 
     /**
      * A flag to authorize update of the license part of the header.
      * <p/>
      * <b>Note:</b> By default, authorize it since license part should always be
      * generated by the plugin.
      *
      * @parameter expression="${license.canUpdateLicense}" default-value="true"
      * @since 1.0
      */
     protected boolean canUpdateLicense;
 
     /**
      * A flag to update copyright application time (change copyright last year
      * if required) according to the last commit made on the processed file.
      * <p/>
      * Note that this functionnality is still not effective.
      *
      * @parameter expression="${license.updateCopyright}" default-value="false"
      * @since 1.0
      */
     protected boolean updateCopyright;
 
     /**
      * A tag to place on files that will be ignored by the plugin.
      * <p/>
      * Sometimes, it is necessary to do this when file is under a specific license.
      * <p/>
      * <b>Note:</b> If no sets, will use the default tag {@code %%Ignore-License}
      *
      * @parameter expression="${license.ignoreTag}"
      * @since 1.0
      */
     protected String ignoreTag;
 
     /**
      * A flag to skip the goal.
      *
      * @parameter expression="${license.skipUpdateLicense}" default-value="false"
      * @since 1.0
      */
     protected boolean skipUpdateLicense;
 
     /**
      * A flag to test plugin but modify no file.
      *
      * @parameter expression="${dryRun}" default-value="false"
      * @since 1.0
      */
     protected boolean dryRun;
 
     /**
      * A flag to clear everything after execution.
      * <p/>
      * <b>Note:</b> This property should ONLY be used for test purpose.
      *
      * @parameter expression="${license.clearAfterOperation}" default-value="true"
      * @since 1.0
      */
     protected boolean clearAfterOperation;
 
     /**
      * To specify the base dir from which we apply the license.
      * <p/>
      * Should be on form "root1,root2,rootn".
      * <p/>
      * By default, the main roots are "src, target/generated-sources, target/processed-sources".
      * <p/>
      * <b>Note:</b> If some of these roots do not exist, they will be simply
      * ignored.
      * <p/>
      * <b>Note:</b> This parameter is not useable if you are still using a project file descriptor.
      *
      * @parameter expression="${license.roots}"
      * @since 1.0
      */
     protected String[] roots;
 
     /**
      * Specific files to includes, separated by a comma. By default, it is "** /*".
      * <p/>
      * <b>Note:</b> This parameter is not useable if you are still using a project file descriptor.
      *
      * @parameter expression="${license.includes}"
      * @since 1.0
      */
     protected String[] includes;
 
     /**
      * Specific files to excludes, separated by a comma.
      * By default, thoses file type are excluded:
      * <ul>
      * <li>modelisation</li>
      * <li>images</li>
      * </ul>
      * <p/>
      * <b>Note:</b> This parameter is not useable if you are still using a project file descriptor.
      *
      * @parameter expression="${license.excludes}"
      * @since 1.0
      */
     protected String[] excludes;
 
     /**
      * To associate extra extension files to an existing comment style.
      * <p/>
      * Keys of the map are the extension of extra files to treate, and the value
      * is the comment style you want to associate.
      * <p/>
      * For example, to treate file with extensions {@code java2} and {@code jdata}
      * as {@code java} files (says using the {@code java} comment style, declare this
      * in your plugin configuration :
      * <pre>
      * &lt;extraExtensions&gt;
      * &lt;java2&gt;java&lt;/java2&gt;
      * &lt;jdata&gt;java&lt;/jdata&gt;
      * &lt;/extraExtensions&gt;
      * </pre>
      * <p/>
      * <b>Note:</b> This parameter is not useable if you are still using a project file descriptor.
      *
      * @parameter
      * @since 1.0
      */
     protected Map<String, String> extraExtensions;
 
     /**
      * @component role="org.nuiton.processor.Processor" roleHint="file-header"
      * @since 1.0
      */
     private FileHeaderProcessor processor;
 
     /**
      * The processor filter used to change header content.
      *
      * @component role="org.codehaus.mojo.license.header.FileHeaderFilter" roleHint="update-file-header"
      * @since 1.0
      */
     private UpdateFileHeaderFilter filter;
 
     /**
      * All available header transformers.
      *
      * @component role="org.codehaus.mojo.license.header.transformer.FileHeaderTransformer"
      * @since 1.0
      */
     private Map<String, FileHeaderTransformer> transformers;
 
     /**
      * internal file header transformer.
      */
     private FileHeaderTransformer transformer;
 
     /**
      * internal default file header.
      */
     private FileHeader header;
 
     /**
      * timestamp used for generation.
      */
     private long timestamp;
 
     /**
      * The dictionnary of extension indexed by their associated comment style.
      *
      * @since 1.0
      */
     private Map<String, String> extensionToCommentStyle;
 
     public static final String[] DEFAULT_INCLUDES = new String[]{ "**/*" };
 
     public static final String[] DEFAULT_EXCLUDES =
         new String[]{ "**/*.zargo", "**/*.uml", "**/*.umldi", "**/*.xmi", /* modelisation */
             "**/*.img", "**/*.png", "**/*.jpg", "**/*.jpeg", "**/*.gif", /* images */
             "**/*.zip", "**/*.jar", "**/*.war", "**/*.ear", "**/*.tgz", "**/*.gz" };
 
     public static final String[] DEFAULT_ROOTS =
         new String[]{ "src", "target/generated-sources", "target/processed-sources" };
 
     /**
      * Defines state of a file after process.
      *
      * @author tchemit <chemit@codelutin.com>
      * @since 1.0
      */
     enum FileState
     {
 
         /**
          * file was updated
          */
         update,
 
         /**
          * file was up to date
          */
         uptodate,
 
         /**
          * something was added on file
          */
         add,
 
         /**
          * file was ignored
          */
         ignore,
 
         /**
          * treatment failed for file
          */
         fail;
 
         /**
          * register a file for this state on result dictionary.
          *
          * @param file   file to add
          * @param result dictionary to update
          */
         public void addFile( File file, EnumMap<FileState, Set<File>> result )
         {
             Set<File> fileSet = result.get( this );
             if ( fileSet == null )
             {
                 fileSet = new HashSet<File>();
                 result.put( this, fileSet );
             }
             fileSet.add( file );
         }
     }
 
     /**
      * set of processed files
      */
     private Set<File> processedFiles;
 
     /**
      * Dictionnary of treated files indexed by their state.
      */
     private EnumMap<FileState, Set<File>> result;
 
     /**
      * Dictonnary of files to treate indexed by their CommentStyle.
      */
     private Map<String, List<File>> filesToTreateByCommentStyle;
 
     @Override
     public void init()
         throws Exception
     {
 
         if ( isSkip() )
         {
             return;
         }
 
         if ( StringUtils.isEmpty( getIgnoreTag() ) )
         {
 
             // use default value
             setIgnoreTag( "%" + "%Ignore-License" );
         }
 
         if ( isVerbose() )
         {
 
             // print availables comment styles (transformers)
             StringBuilder buffer = new StringBuilder();
             buffer.append( "config - available comment styles :" );
             String commentFormat = "\n  * %1$s (%2$s)";
             for ( String transformerName : getTransformers().keySet() )
             {
                 FileHeaderTransformer transformer = getTransformer( transformerName );
                 String str = String.format( commentFormat, transformer.getName(), transformer.getDescription() );
                 buffer.append( str );
             }
             getLog().info( buffer.toString() );
         }
 
         if ( isUpdateCopyright() )
         {
 
             getLog().warn( "\n\nupdateCopyright is not still available...\n\n" );
             //TODO-TC20100409 checks scm
             // checks scm is ok
             // for the moment, will only deal with svn except if scm
             // offers a nice api to obtain last commit date on a file
 
         }
 
         // set timestamp used for temporary files
         setTimestamp( System.nanoTime() );
 
         // add flags to authorize or not updates of header
         getFilter().setUpdateCopyright( isCanUpdateCopyright() );
         getFilter().setUpdateDescription( isCanUpdateDescription() );
         getFilter().setUpdateLicense( isCanUpdateLicense() );
 
         getFilter().setLog( getLog() );
         getProcessor().setConfiguration( this );
         getProcessor().setFilter( filter );
 
         super.init();
 
         if ( roots == null || roots.length == 0 )
         {
             roots = DEFAULT_ROOTS;
             if ( isVerbose() )
             {
                 getLog().info( "Will use default roots " + Arrays.toString( roots ) );
             }
         }
 
         if ( includes == null || includes.length == 0 )
         {
             includes = DEFAULT_INCLUDES;
             if ( isVerbose() )
             {
                 getLog().info( "Will use default includes " + Arrays.toString( includes ) );
             }
         }
 
         if ( excludes == null || excludes.length == 0 )
         {
             excludes = DEFAULT_EXCLUDES;
             if ( isVerbose() )
             {
                 getLog().info( "Will use default excludes" + Arrays.toString( excludes ) );
             }
         }
 
         extensionToCommentStyle = new TreeMap<String, String>();
 
         // add default extensions from header transformers
         for ( Map.Entry<String, FileHeaderTransformer> entry : transformers.entrySet() )
         {
             String commentStyle = entry.getKey();
             FileHeaderTransformer transformer = entry.getValue();
 
             String[] extensions = transformer.getDefaultAcceptedExtensions();
             for ( String extension : extensions )
             {
                 if ( isVerbose() )
                 {
                     getLog().info( "Associate extension " + extension + " to comment style " + commentStyle );
                 }
                 extensionToCommentStyle.put( extension, commentStyle );
             }
         }
 
         if ( extraExtensions != null )
         {
 
             // fill extra extensions for each transformer
             for ( Map.Entry<String, String> entry : extraExtensions.entrySet() )
             {
                 String extension = entry.getKey();
                 if ( extensionToCommentStyle.containsKey( extension ) )
                 {
 
                     // override existing extension mapping
                     getLog().warn( "The extension " + extension + " is already accepted for comment style " +
                                        extensionToCommentStyle.get( extension ) );
                 }
                 String commentStyle = entry.getValue();
 
                 // check transformer exists
                 getTransformer( commentStyle );
 
                 if ( isVerbose() )
                 {
                     getLog().info( "Associate extension '" + extension + "' to comment style '" + commentStyle + "'" );
                 }
                 extensionToCommentStyle.put( extension, commentStyle );
             }
         }
 
         // get all files to treate indexed by their comment style
         filesToTreateByCommentStyle = obtainFilesToTreateByCommentStyle();
     }
 
     protected Map<String, List<File>> obtainFilesToTreateByCommentStyle()
     {
 
         Map<String, List<File>> result = new HashMap<String, List<File>>();
 
         // add for all known comment style (says transformer) a empty list
         // this permits not to have to test if there is an already list each time
         // we wants to add a new file...
         for ( String commentStyle : transformers.keySet() )
         {
             result.put( commentStyle, new ArrayList<File>() );
         }
 
         List<String> rootsList = new ArrayList<String>( roots.length );
         for ( String root : roots )
         {
             File f = new File( root );
             if ( f.isAbsolute() )
             {
                 rootsList.add( f.getAbsolutePath() );
             }
             else
             {
                 f = new File( getProject().getBasedir(), root );
             }
             if ( f.exists() )
             {
                 getLog().info( "Will search files to update from root " + f );
                 rootsList.add( f.getAbsolutePath() );
             }
             else
             {
                 if ( isVerbose() )
                 {
                     getLog().info( "Skip not found root " + f );
                 }
             }
         }
 
         // Obtain all files to treate
         Map<File, String[]> allFiles = new HashMap<File, String[]>();
         getFilesToTreateForRoots( includes, excludes, rootsList, allFiles );
 
         // filter all these files according to their extension
 
         for ( Map.Entry<File, String[]> entry : allFiles.entrySet() )
         {
             File root = entry.getKey();
             String[] filesPath = entry.getValue();
 
             // sort them by the associated comment style to their extension
             for ( String path : filesPath )
             {
                 String extension = FileUtils.extension( path );
                 String commentStyle = extensionToCommentStyle.get( extension );
                 if ( StringUtils.isEmpty( commentStyle ) )
                 {
 
                     // unknown extension, do not treate this file
                     continue;
                 }
                 //
                 File file = new File( root, path );
                 List<File> files = result.get( commentStyle );
                 files.add( file );
             }
         }
         return result;
     }
 
     @Override
     public void doAction()
         throws Exception
     {
 
         long t0 = System.nanoTime();
 
         clear();
 
         processedFiles = new HashSet<File>();
         result = new EnumMap<FileState, Set<File>>( FileState.class );
 
         try
         {
 
             for ( Map.Entry<String, List<File>> commentStyleFiles : getFilesToTreateByCommentStyle().entrySet() )
             {
 
                 String commentStyle = commentStyleFiles.getKey();
                 List<File> files = commentStyleFiles.getValue();
 
                 processCommentStyle( commentStyle, files );
             }
 
         }
         finally
         {
 
             int nbFiles = getProcessedFiles().size();
             if ( nbFiles == 0 )
             {
                 getLog().warn( "No file to scan." );
             }
             else
             {
                 String delay = MojoHelper.convertTime( System.nanoTime() - t0 );
                 String message =
                     String.format( "Scan %s file%s header done in %s.", nbFiles, nbFiles > 1 ? "s" : "", delay );
                 getLog().info( message );
             }
             Set<FileState> states = result.keySet();
             if ( states.size() == 1 && states.contains( FileState.uptodate ) )
             {
                 // all files where up to date
                 getLog().info( "All files are up-to-date." );
             }
             else
             {
 
                 StringBuilder buffer = new StringBuilder();
                 for ( FileState state : FileState.values() )
                 {
 
                     reportType( state, buffer );
                 }
 
                 getLog().info( buffer.toString() );
             }
 
             // clean internal states
             if ( isClearAfterOperation() )
             {
                 clear();
             }
         }
     }
 
     protected void processCommentStyle( String commentStyle, List<File> filesToTreat )
         throws IOException
     {
 
         // obtain license from definition
         License license = getLicense( getLicenseName(), true );
 
         getLog().info( "Process header '" + commentStyle + "'" );
         getLog().info( " - using " + license.getDescription() );
 
         // use header transformer according to comment style given in header
         setTransformer( getTransformer( commentStyle ) );
 
         // file header to use if no header is found on a file
         FileHeader defaultFileHeader =
             buildDefaultFileHeader( license, getProjectName(), getInceptionYear(), getOrganizationName(),
                                     isAddSvnKeyWords(), getEncoding() );
 
         // change default license header in processor
         setHeader( defaultFileHeader );
 
         // update processor filter
         getProcessor().populateFilter();
 
         for ( File file : filesToTreat )
         {
             prepareProcessFile( file );
         }
         filesToTreat.clear();
     }
 
 
     protected void prepareProcessFile( File file )
         throws IOException
     {
 
         if ( getProcessedFiles().contains( file ) )
         {
             getLog().info( " - skip already processed file " + file );
             return;
         }
 
         // output file
         File processFile = new File( file.getAbsolutePath() + "_" + getTimestamp() );
         boolean doFinalize = false;
         try
         {
             doFinalize = processFile( file, processFile );
         }
         catch ( Exception e )
         {
             getLog().warn( "skip failed file : " + e.getMessage() +
                                ( e.getCause() == null ? "" : " Cause : " + e.getCause().getMessage() ), e );
             FileState.fail.addFile( file, getResult() );
             doFinalize = false;
         }
         finally
         {
 
             // always clean processor internal states
             getProcessor().reset();
 
             // whatever was the result, this file is treated.
             getProcessedFiles().add( file );
 
             if ( doFinalize )
             {
                 finalizeFile( file, processFile );
             }
             else
             {
                 FileUtil.deleteFile( processFile );
             }
         }
 
     }
 
     /**
      * Process the given {@code file} and save the result in the given
      * {@code processFile}.
      *
      * @param file        the file to process
      * @param processFile the ouput processed file
      * @return {@code true} if prepareProcessFile can be finalize, otherwise need to be delete
      * @throws IOException if any pb while treatment
      */
     protected boolean processFile( File file, File processFile )
         throws IOException
     {
 
         if ( getLog().isDebugEnabled() )
         {
             getLog().debug( " - process file " + file );
             getLog().debug( " - will process into file " + processFile );
         }
 
         String content;
 
         try
         {
 
             // check before all that file should not be skip by the ignoreTag
             // this is a costy operation
             //TODO-TC-20100411 We should process always from the read content not reading again from file
 
             content = FileUtil.readAsString( file, getEncoding() );
 
         }
         catch ( IOException e )
         {
             throw new IOException( "Could not obtain content of file " + file );
         }
 
         //check that file is not marked to be ignored
         if ( content.contains( getIgnoreTag() ) )
         {
             getLog().info( " - ignore file (detected " + getIgnoreTag() + ") " + file );
 
             FileState.ignore.addFile( file, getResult() );
 
             return false;
         }
 
         FileHeaderProcessor processor = getProcessor();
 
         // process file to detect header
 
         try
         {
             processor.process( file, processFile );
         }
         catch ( IllegalStateException e )
         {
             // could not obtain existing header
             throw new InvalideFileHeaderException(
                 "Could not extract header on file " + file + " for reason " + e.getMessage() );
         }
         catch ( Exception e )
         {
             if ( e instanceof InvalideFileHeaderException )
             {
                 throw (InvalideFileHeaderException) e;
             }
             throw new IOException( "Could not process file " + file + " for reason " + e.getMessage() );
         }
 
         if ( processor.isTouched() )
         {
 
             if ( isVerbose() )
             {
                 getLog().info( " - header was updated for " + file );
             }
             if ( processor.isModified() )
             {
 
                 // header content has changed
                 // must copy back process file to file (if not dry run)
 
                 FileState.update.addFile( file, getResult() );
                 return true;
 
             }
 
             FileState.uptodate.addFile( file, getResult() );
             return false;
         }
 
         // header was not fully (or not at all) detected in file
 
         if ( processor.isDetectHeader() )
         {
 
             // file has not a valid header (found a start process atg, but
             // not an ending one), can not do anything
             throw new InvalideFileHeaderException( "Could not find header end on file " + file );
         }
 
         // no header at all, add a new header
 
         getLog().info( " - adding license header on file " + file );
 
         //FIXME tchemit 20100409 xml files must add header after a xml prolog line
         content = getTransformer().addHeader( getFilter().getFullHeaderContent(), content );
 
         if ( !isDryRun() )
         {
             FileUtil.writeString( processFile, content, getEncoding() );
         }
 
         FileState.add.addFile( file, getResult() );
         return true;
     }
 
     protected void finalizeFile( File file, File processFile )
         throws IOException
     {
 
         if ( isKeepBackup() && !isDryRun() )
         {
             File backupFile = FileUtil.getBackupFile( file );
 
             if ( backupFile.exists() )
             {
 
                 // always delete backup file, before the renaming
                 FileUtil.deleteFile( backupFile );
             }
 
             if ( isVerbose() )
             {
                 getLog().debug( " - backup original file " + file );
             }
 
             FileUtil.renameFile( file, backupFile );
         }
 
         if ( isDryRun() )
         {
 
             // dry run, delete temporary file
             FileUtil.deleteFile( processFile );
         }
         else
         {
 
             try
             {
 
                 // replace file with the updated one
                 FileUtil.renameFile( processFile, file );
             }
             catch ( IOException e )
             {
 
                 // workaround windows problem to rename  files
                 getLog().warn( e.getMessage() );
 
                 // try to copy content (fail on windows xp...)
                 FileUtils.copyFile( processFile, file );
 
                 // then delete process file
                 FileUtil.deleteFile( processFile );
             }
         }
     }
 
     @Override
     protected void finalize()
         throws Throwable
     {
         super.finalize();
         clear();
     }
 
     protected void clear()
     {
         Set<File> files = getProcessedFiles();
         if ( files != null )
         {
             files.clear();
         }
         EnumMap<FileState, Set<File>> result = getResult();
         if ( result != null )
         {
             for ( Set<File> fileSet : result.values() )
             {
                 fileSet.clear();
             }
             result.clear();
         }
     }
 
     protected void reportType( FileState state, StringBuilder buffer )
     {
         String operation = state.name();
 
         Set<File> set = getFiles( state );
         if ( set == null || set.isEmpty() )
         {
             if ( isVerbose() )
             {
                 buffer.append( "\n * no header to " );
                 buffer.append( operation );
                 buffer.append( "." );
             }
             return;
         }
         buffer.append( "\n * " ).append( operation ).append( " header on " );
         buffer.append( set.size() );
         if ( set.size() == 1 )
         {
             buffer.append( " file." );
         }
         else
         {
             buffer.append( " files." );
         }
         if ( isVerbose() )
         {
             for ( File file : set )
             {
                 buffer.append( "\n   - " ).append( file );
             }
         }
     }
 
     /**
      * Build a default header given the parameters.
      *
      * @param license         the license type ot use in header
      * @param projectName     project name as header description
      * @param inceptionYear   first year of copyright
      * @param copyrightHolder holder of copyright
      * @param encoding        encoding used to read or write files
      * @param addSvnKeyWords  a flag to add in description section svn keywords
      * @return the new file header
      * @throws IOException if any problem while creating file header
      */
     protected FileHeader buildDefaultFileHeader( License license, String projectName, String inceptionYear,
                                                  String copyrightHolder, boolean addSvnKeyWords, String encoding )
         throws IOException
     {
         FileHeader result = new FileHeader();
 
         StringBuilder buffer = new StringBuilder();
         buffer.append( projectName );
         if ( addSvnKeyWords )
         {
             // add svn keyworks
             char ls = FileHeaderTransformer.LINE_SEPARATOR;
             buffer.append( ls );
 
             // breaks the keyword otherwise svn will update them here
             //TC-20100415 : do not generate thoses redundant keywords
 //            buffer.append(ls).append("$" + "Author$");
 //            buffer.append(ls).append("$" + "LastChangedDate$");
 //            buffer.append(ls).append("$" + "LastChangedRevision$");
             buffer.append( ls ).append( "$" + "Id$" );
             buffer.append( ls ).append( "$" + "HeadURL$" );
 
         }
         result.setDescription( buffer.toString() );
         if ( getLog().isDebugEnabled() )
         {
             getLog().debug( "header description : " + result.getDescription() );
         }
 
         String licenseContent = license.getHeaderContent( encoding );
         result.setLicense( licenseContent );
 
         Integer firstYear = Integer.valueOf( inceptionYear );
         result.setCopyrightFirstYear( firstYear );
 
         Calendar cal = Calendar.getInstance();
         cal.setTime( new Date() );
         Integer lastYear = cal.get( Calendar.YEAR );
         if ( firstYear < lastYear )
         {
             result.setCopyrightLastYear( lastYear );
         }
         result.setCopyrightHolder( copyrightHolder );
         return result;
     }
 
     public FileHeaderTransformer getTransformer( String transformerName )
         throws IllegalArgumentException, IllegalStateException
     {
         if ( StringUtils.isEmpty( transformerName ) )
         {
             throw new IllegalArgumentException( "transformerName can not be null, nor empty!" );
         }
         Map<String, FileHeaderTransformer> transformers = getTransformers();
         if ( transformers == null )
         {
             throw new IllegalStateException( "No transformers initialized!" );
         }
         FileHeaderTransformer transformer = transformers.get( transformerName );
         if ( transformer == null )
         {
             throw new IllegalArgumentException(
                 "transformerName " + transformerName + " is unknow, use one this one : " + transformers.keySet() );
         }
         return transformer;
     }
 
     public boolean isClearAfterOperation()
     {
         return clearAfterOperation;
     }
 
     public long getTimestamp()
     {
         return timestamp;
     }
 
     public String getProjectName()
     {
         return projectName;
     }
 
     public String getInceptionYear()
     {
         return inceptionYear;
     }
 
     public String getOrganizationName()
     {
         return organizationName;
     }
 
     public boolean isUpdateCopyright()
     {
         return updateCopyright;
     }
 
     public boolean isCanUpdateDescription()
     {
         return canUpdateDescription;
     }
 
     public boolean isCanUpdateCopyright()
     {
         return canUpdateCopyright;
     }
 
     public boolean isCanUpdateLicense()
     {
         return canUpdateLicense;
     }
 
     public String getIgnoreTag()
     {
         return ignoreTag;
     }
 
     public boolean isDryRun()
     {
         return dryRun;
     }
 
     public UpdateFileHeaderFilter getFilter()
     {
         return filter;
     }
 
     public FileHeader getFileHeader()
     {
         return header;
     }
 
     public FileHeaderTransformer getTransformer()
     {
         return transformer;
     }
 
     @Override
     public boolean isSkip()
     {
         return skipUpdateLicense;
     }
 
     public Set<File> getProcessedFiles()
     {
         return processedFiles;
     }
 
     public EnumMap<FileState, Set<File>> getResult()
     {
         return result;
     }
 
     public Set<File> getFiles( FileState state )
     {
         return result.get( state );
     }
 
     public boolean isAddSvnKeyWords()
     {
         return addSvnKeyWords;
     }
 
     public FileHeaderProcessor getProcessor()
     {
         return processor;
     }
 
     public Map<String, FileHeaderTransformer> getTransformers()
     {
         return transformers;
     }
 
     public Map<String, List<File>> getFilesToTreateByCommentStyle()
     {
         return filesToTreateByCommentStyle;
     }
 
     @Override
     public void setSkip( boolean skipUpdateLicense )
     {
         this.skipUpdateLicense = skipUpdateLicense;
     }
 
     public void setDryRun( boolean dryRun )
     {
         this.dryRun = dryRun;
     }
 
     public void setTimestamp( long timestamp )
     {
         this.timestamp = timestamp;
     }
 
     public void setProjectName( String projectName )
     {
         this.projectName = projectName;
     }
 
     public void setSkipUpdateLicense( boolean skipUpdateLicense )
     {
         this.skipUpdateLicense = skipUpdateLicense;
     }
 
     public void setInceptionYear( String inceptionYear )
     {
         this.inceptionYear = inceptionYear;
     }
 
     public void setOrganizationName( String organizationName )
     {
         this.organizationName = organizationName;
     }
 
     public void setUpdateCopyright( boolean updateCopyright )
     {
         this.updateCopyright = updateCopyright;
     }
 
     public void setIgnoreTag( String ignoreTag )
     {
         this.ignoreTag = ignoreTag;
     }
 
     public void setAddSvnKeyWords( boolean addSvnKeyWords )
     {
         this.addSvnKeyWords = addSvnKeyWords;
     }
 
     public void setClearAfterOperation( boolean clearAfterOperation )
     {
         this.clearAfterOperation = clearAfterOperation;
     }
 
     public void setTransformer( FileHeaderTransformer transformer )
     {
         this.transformer = transformer;
     }
 
     public void setHeader( FileHeader header )
     {
         this.header = header;
     }
 
     public void setProcessor( FileHeaderProcessor processor )
     {
         this.processor = processor;
     }
 
     public void setFilter( UpdateFileHeaderFilter filter )
     {
         this.filter = filter;
     }
 
     public void setCanUpdateDescription( boolean canUpdateDescription )
     {
         this.canUpdateDescription = canUpdateDescription;
     }
 
     public void setCanUpdateCopyright( boolean canUpdateCopyright )
     {
         this.canUpdateCopyright = canUpdateCopyright;
     }
 
     public void setCanUpdateLicense( boolean canUpdateLicense )
     {
         this.canUpdateLicense = canUpdateLicense;
     }
 
     public void setTransformers( Map<String, FileHeaderTransformer> transformers )
     {
         this.transformers = transformers;
     }
 
     public void setFilesToTreateByCommentStyle( Map<String, List<File>> filesToTreateByCommentStyle )
     {
         this.filesToTreateByCommentStyle = filesToTreateByCommentStyle;
     }
 
     public void setRoots( String[] roots )
     {
         this.roots = roots;
     }
 
     public void setRoots( String roots )
     {
         this.roots = roots.split( "," );
     }
 
     public void setIncludes( String[] includes )
     {
         this.includes = includes;
     }
 
     public void setIncludes( String includes )
     {
         this.includes = includes.split( "," );
     }
 
     public void setExcludes( String[] excludes )
     {
         this.excludes = excludes;
     }
 
     public void setExcludes( String excludes )
     {
         this.excludes = excludes.split( "," );
     }
 
     /**
      * Collects some file.
      *
      * @param includes includes
      * @param excludes excludes
      * @param roots    root directories to treate
      * @param files    cache of file detected indexed by their root directory
      */
     protected void getFilesToTreateForRoots( String[] includes, String[] excludes, List<String> roots,
                                              Map<File, String[]> files )
     {
 
         DirectoryScanner ds = new DirectoryScanner();
         ds.setIncludes( includes );
         if ( excludes != null )
         {
             ds.setExcludes( excludes );
         }
         for ( String src : roots )
         {
 
             File f = new File( src );
             if ( !f.exists() )
             {
                 // do nothing on a non-existent
                 continue;
             }
 
             if ( getLog().isDebugEnabled() )
             {
                 getLog().debug( "discovering source files in " + src );
             }
 
             ds.setBasedir( f );
             // scan
             ds.scan();
 
             // get files
             String[] tmp = ds.getIncludedFiles();
 
             if ( tmp.length < 1 )
             {
                 // no files found
                 continue;
             }
 
             List<String> toTreate = new ArrayList<String>();
 
             for ( String filePath : tmp )
             {
                 File srcFile = new File( f, filePath );
                 // check file is up-to-date
                 toTreate.add( filePath );
             }
 
             if ( toTreate.isEmpty() )
             {
                 // no file or all are up-to-date
                 continue;
             }
 
             // register files
             files.put( f, toTreate.toArray( new String[toTreate.size()] ) );
         }
     }
 }