iterator
Class DuplElim

java.lang.Object
  iterator.Iterator
      iterator.DuplElim

All Implemented Interfaces:

Flags

public class DuplElim

extends Iterator

Eleminate the duplicate tuples from the input relation

Field Summary

Fields inherited from class iterator.Iterator

closeFlag

Fields inherited from interface global.Flags

DEBUG, TEST

Constructor Summary

DuplElim(AttrType[] in, short len_in, short[] s_sizes, Iterator am, int amt_of_mem, boolean inp_sorted)
Constructor to set up some information.

Method Summary

void	close() implement the abstract method close() from super class Iterator to finish cleaning up
Tuple	get_next() The tuple is returned.

Methods inherited from class iterator.Iterator

free_buffer_pages, get_buffer_pages

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DuplElim

public DuplElim(AttrType[] in,
                short len_in,
                short[] s_sizes,
                Iterator am,
                int amt_of_mem,
                boolean inp_sorted)
         throws java.io.IOException,
                DuplElimException

Constructor to set up some information.

Parameters:

len_in - # of columns in R.

am - input relation iterator, access method for left input to join,

amt_of_mem - the page numbers required IN PAGES

Throws:

java.io.IOException - some I/O fault

DuplElimException - the exception from DuplElim.java

Method Detail

get_next

public Tuple get_next()
               throws java.io.IOException,
                      JoinsException,
                      index.IndexException,
                      InvalidTupleSizeException,
                      InvalidTypeException,
                      PageNotReadException,
                      TupleUtilsException,
                      PredEvalException,
                      SortException,
                      LowMemException,
                      UnknowAttrType,
                      UnknownKeyTypeException,
                      java.lang.Exception

The tuple is returned.

Specified by:

get_next in class Iterator

Returns:

call this function to get the tuple

Throws:

JoinsException - some join exception

index.IndexException - exception from super class

java.io.IOException - I/O errors

InvalidTupleSizeException - invalid tuple size

InvalidTypeException - tuple type not valid

PageNotReadException - exception from lower layer

TupleUtilsException - exception from using tuple utilities

PredEvalException - exception from PredEval class

SortException - sort exception

LowMemException - memory error

UnknowAttrType - attribute type unknown

UnknownKeyTypeException - key type unknown

java.lang.Exception - other exceptions

close

public void close()
           throws JoinsException

implement the abstract method close() from super class Iterator to finish cleaning up

Specified by:

close in class Iterator

Throws:

JoinsException - join error from lower layers