question: @ Override public boolean input ( Instance instance ) throws Exception { if ( getInputFormat ( ) == null ) { throw new IllegalStateException ( "No input instance format defined" ) ; } if ( m_NewBatch ) { resetQueue ( ) ; m_NewBatch = false ; } if ( outputFormatPeek ( ) != null ) { convertInstance ( instance ) ; return true ; } bufferInput ( instance ) ; return false ; }
target:  Input an instance for filtering. Ordinarily the instance is processed and made available for output immediately. Some filters require all instances be read before producing output.