org.pentaho.reporting.libraries.formula.operators
Class SubtractOperator

java.lang.Object
  org.pentaho.reporting.libraries.formula.operators.AbstractNumericOperator
      org.pentaho.reporting.libraries.formula.operators.SubtractOperator

All Implemented Interfaces:

Serializable, InfixOperator

public class SubtractOperator
extends AbstractNumericOperator

Creation-Date: 31.10.2006, 16:34:11

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

SubtractOperator()

Method Summary

int	getLevel()
boolean	isAssociative() Defines, whether the operation is associative.
boolean	isLeftOperation() Defines the bind-direction of the operator.
String	toString()

Methods inherited from class org.pentaho.reporting.libraries.formula.operators.AbstractNumericOperator

evaluate

Methods inherited from class java.lang.Object

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

Constructor Detail

SubtractOperator

public SubtractOperator()

Method Detail

getLevel

public int getLevel()

toString

public String toString()

Overrides:

toString in class Object

isLeftOperation

public boolean isLeftOperation()

Description copied from interface: InfixOperator

Defines the bind-direction of the operator. That direction defines, in which direction a sequence of equal operators is resolved.

Returns:

true, if the operation is left-binding, false if right-binding

isAssociative

public boolean isAssociative()

Defines, whether the operation is associative. For associative operations, the evaluation order does not matter, if the operation appears more than once in an expression, and therefore we can optimize them a lot better than non-associative operations (ie. merge constant parts and precompute them once).

Returns:

true, if the operation is associative, false otherwise