isql.predicate
Class ComparisonPredicate

java.lang.Object
  isql.predicate.ComparisonPredicate

All Implemented Interfaces:

IPredicate

public class ComparisonPredicate
extends java.lang.Object
implements IPredicate

It builds the view for a single comparison in the WHERE clause (a = b, a <> b...)

Author:

SHZ Sep 27, 2007

Constructor Summary

ComparisonPredicate(IExpression a, IExpression b, IComparison comparison)

Method Summary

WhereView	apply() Builds the view resulting from the comparison of the two expressions
static void	fillViewMaps(java.lang.Object[] arrA, java.lang.Object[] arrB, WhereView viewA, WhereView viewB, IComparison comparison) Fills the views of A and B with the indices of the columns for the rows for which the comparison has success
static java.lang.Object[]	toArray(ITypedValue res) Convert the content of a column into an array, whatever it is
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparisonPredicate

public ComparisonPredicate(IExpression a,
                           IExpression b,
                           IComparison comparison)

Method Detail

apply

public WhereView apply()
                throws ISQLException

Builds the view resulting from the comparison of the two expressions

Specified by:

apply in interface IPredicate

Returns:

the view

Throws:

ISQLException

fillViewMaps

public static void fillViewMaps(java.lang.Object[] arrA,
                                java.lang.Object[] arrB,
                                WhereView viewA,
                                WhereView viewB,
                                IComparison comparison)
                         throws ISQLException

Fills the views of A and B with the indices of the columns for the rows for which the comparison has success

Parameters:

arrA - the values of column A

arrB - the values of column B

viewA - the view related to column A, that gets filled with the indices

viewB - the view related to column B, that gets filled with the indices

comparison - the comparison operator

Throws:

ISQLException

toArray

public static java.lang.Object[] toArray(ITypedValue res)

Convert the content of a column into an array, whatever it is

Parameters:

res - the content of a column (can be an array or a constant)

Returns:

the final array

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object