question: private void exportSourceDocuments ( Project aProject , File aCopyDir ) throws IOException , ProjectExportException { File sourceDocumentDir = new File ( aCopyDir + SOURCE_FOLDER ) ; FileUtils . forceMkdir ( sourceDocumentDir ) ; List < de . tudarmstadt . ukp . clarin . webanno . model . SourceDocument > documents = repository . listSourceDocuments ( aProject ) ; documents . addAll ( automationService . listTabSepDocuments ( aProject ) ) ; int i = 1 ; for ( de . tudarmstadt . ukp . clarin . webanno . model . SourceDocument sourceDocument : documents ) { try { FileUtils . copyFileToDirectory ( repository . getSourceDocumentFile ( sourceDocument ) , sourceDocumentDir ) ; progress = ( int ) Math . ceil ( ( ( double ) i ) / documents . size ( ) * 10.0 ) ; i ++ ; } catch ( FileNotFoundException e ) { StringBuffer errorMessage = new StringBuffer ( ) ; errorMessage . append ( "Source file '" ) ; errorMessage . append ( sourceDocument . getName ( ) ) ; errorMessage . append ( "' related to project couldn't be located in repository" ) ; LOG . error ( errorMessage . toString ( ) ) ; LOG . error ( ExceptionUtils . getRootCause ( e ) ) ; messages . add ( errorMessage . toString ( ) ) ; throw new ProjectExportException ( "Couldn't find some source file(s) related to project" ) ; } } }
target:  Copy source documents from the file system of this project to the export folder