iterator
Class PredEval

java.lang.Object
  iterator.PredEval

public class PredEval

extends java.lang.Object

Constructor Summary

PredEval()

Method Summary

static boolean

Eval(CondExpr[] p, Tuple t1, Tuple t2, AttrType[] in1, AttrType[] in2) predicate evaluate, according to the condition ConExpr, judge if the two tuple can join.

Methods inherited from class java.lang.Object

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

Constructor Detail

PredEval

public PredEval()

Method Detail

Eval

public static boolean Eval(CondExpr[] p,
                           Tuple t1,
                           Tuple t2,
                           AttrType[] in1,
                           AttrType[] in2)
                    throws java.io.IOException,
                           UnknowAttrType,
                           InvalidTupleSizeException,
                           InvalidTypeException,
                           FieldNumberOutOfBoundException,
                           PredEvalException

predicate evaluate, according to the condition ConExpr, judge if the two tuple can join. if so, return true, otherwise false

Parameters:

t1 - compared tuple1

t2 - compared tuple2

Returns:

true or false

Throws:

java.io.IOException - some I/O error

UnknowAttrType - don't know the attribute type

InvalidTupleSizeException - size of tuple not valid

InvalidTypeException - type of tuple not valid

FieldNumberOutOfBoundException - field number exceeds limit

PredEvalException - exception from this method