question: public Object next ( ) throws IOException { if ( prevPos <= 0 ) return null ; long endOfThisRecord = prevPos ; int thisLength = nextLength ; long recordStart = prevPos - thisLength ; prevPos = recordStart - 4 ; if ( prevPos <= 0 ) return null ; long bufferPos = fis . getBufferPos ( ) ; if ( prevPos >= bufferPos ) { } else { long seekPos = endOfThisRecord - fis . getBufferSize ( ) ; seekPos = Math . min ( seekPos , prevPos ) ; seekPos = Math . max ( seekPos , 0 ) ; fis . seek ( seekPos ) ; fis . peek ( ) ; } fis . seek ( prevPos ) ; nextLength = fis . readInt ( ) ; Object o = codec . readVal ( fis ) ; return o ; }
target:  Returns the next object from the log, or null if none available.