isql.expression
Class UnaryExpression

java.lang.Object
  isql.expression.UnaryExpression

All Implemented Interfaces:

IExpression

public class UnaryExpression
extends java.lang.Object
implements IExpression

To evaluate an expression with an unary operator

Author:

SHZ Oct 16, 2007

Constructor Summary

UnaryExpression(IExpression expression, IUnary unary)

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

UnaryExpression

public UnaryExpression(IExpression expression,
                       IUnary unary)

Method Detail

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

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

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object