isql.expression
Class DoubleExpression

java.lang.Object
  isql.expression.DoubleExpression

All Implemented Interfaces:

IExpression

public class DoubleExpression
extends java.lang.Object
implements IExpression

The combination of two other expression through a binary operator (e.g. a+b)

Author:

SHZ Sep 28, 2007

Constructor Summary

DoubleExpression(IExpression a, IExpression b, IBinaryScalar operator)

Method Summary

java.util.Set<ColumnKey>	getInvolvedColumns() Returns the table columns named in the expression
ITypedValue	getResult() Get the result of the expression (can be a constant or an array)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleExpression

public DoubleExpression(IExpression a,
                        IExpression b,
                        IBinaryScalar operator)

Method Detail

getResult

public ITypedValue getResult()
                      throws ISQLException

Description copied from interface: IExpression

Get the result of the expression (can be a constant or an array)

Specified by:

getResult in interface IExpression

Returns:

the result

Throws:

ISQLException

getInvolvedColumns

public java.util.Set<ColumnKey> getInvolvedColumns()

Description copied from interface: IExpression

Returns the table columns named in the expression

Specified by:

getInvolvedColumns in interface IExpression

Returns:

the identifiers of the columns

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object