iterator
Class Projection

java.lang.Object
  iterator.Projection

public class Projection

extends java.lang.Object

Jtuple has the appropriate types. Jtuple already has its setHdr called to setup its vital stas.

Constructor Summary

Projection()

Method Summary

static void	Join(Tuple t1, AttrType[] type1, Tuple t2, AttrType[] type2, Tuple Jtuple, FldSpec[] perm_mat, int nOutFlds) Tuple t1 and Tuple t2 will be joined, and the result will be stored in Tuple Jtuple,before calling this mehtod.
static void	Project(Tuple t1, AttrType[] type1, Tuple Jtuple, FldSpec[] perm_mat, int nOutFlds) Tuple t1 will be projected the result will be stored in Tuple Jtuple

Methods inherited from class java.lang.Object

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

Constructor Detail

Projection

public Projection()

Method Detail

Join

public static void Join(Tuple t1,
                        AttrType[] type1,
                        Tuple t2,
                        AttrType[] type2,
                        Tuple Jtuple,
                        FldSpec[] perm_mat,
                        int nOutFlds)
                 throws UnknowAttrType,
                        FieldNumberOutOfBoundException,
                        java.io.IOException

Tuple t1 and Tuple t2 will be joined, and the result will be stored in Tuple Jtuple,before calling this mehtod. we know that this two tuple can join in the common field

Parameters:

t1 - The Tuple will be joined with t2

t2 - The Tuple will be joined with t1

Jtuple - the returned Tuple

nOutFlds - number of outer relation field

Throws:

UnknowAttrType - attrbute type does't match

FieldNumberOutOfBoundException - field number exceeds limit

java.io.IOException - some I/O fault

Project

public static void Project(Tuple t1,
                           AttrType[] type1,
                           Tuple Jtuple,
                           FldSpec[] perm_mat,
                           int nOutFlds)
                    throws UnknowAttrType,
                           WrongPermat,
                           FieldNumberOutOfBoundException,
                           java.io.IOException

Tuple t1 will be projected the result will be stored in Tuple Jtuple

Parameters:

t1 - The Tuple will be projected

Jtuple - the returned Tuple

nOutFlds - number of outer relation field

Throws:

UnknowAttrType - attrbute type doesn't match

WrongPermat - wrong FldSpec argument

FieldNumberOutOfBoundException - field number exceeds limit

java.io.IOException - some I/O fault