question: private synchronized void rebuildJournal ( ) throws IOException { if ( mJournalWriter != null ) { mJournalWriter . close ( ) ; } Writer writer = new BufferedWriter ( new FileWriter ( mJournalFileTmp ) , IO_BUFFER_SIZE ) ; writer . write ( MAGIC ) ; writer . write ( "\n" ) ; writer . write ( VERSION_1 ) ; writer . write ( "\n" ) ; writer . write ( Integer . toString ( mAppVersion ) ) ; writer . write ( "\n" ) ; writer . write ( "\n" ) ; for ( CacheEntry cacheEntry : mLruEntries . values ( ) ) { if ( cacheEntry . isUnderEdit ( ) ) { writer . write ( sACTION_LIST [ ACTION_DIRTY ] + ' ' + cacheEntry . getKey ( ) + " " + cacheEntry . getSize ( ) + '\n' ) ; } else { writer . write ( sACTION_LIST [ ACTION_CLEAN ] + ' ' + cacheEntry . getKey ( ) + " " + cacheEntry . getSize ( ) + '\n' ) ; } } writer . close ( ) ; mJournalFileTmp . renameTo ( mJournalFile ) ; mJournalWriter = new BufferedWriter ( new FileWriter ( mJournalFile , true ) , IO_BUFFER_SIZE ) ; }
target:  Creates a new journal that omits redundant information. This replaces the current journal if it exists.