csheets.core.formula.lang
Class Negator

java.lang.Object
  csheets.core.formula.lang.Negator

All Implemented Interfaces:

Operator, UnaryOperator, Serializable

public class Negator
extends Object
implements UnaryOperator

A negator (negative sign).

Author:

Einar Pehrson

See Also:

Serialized Form

Constructor Summary

Negator()
Creates a new negator.

Method Summary

Value	applyTo(Expression operand) Returns the negation of the operand's value.
String	getIdentifier() Returns the operator's string identirifer.
Value.Type	getOperandValueType() Returns the type of value that the operator's operands can have.
boolean	isPrefix() Returns whether the operator is a prefix operator, i.e. it appears before its operand.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Negator

public Negator()

Creates a new negator.

Method Detail

applyTo

public Value applyTo(Expression operand)
              throws IllegalValueTypeException

Returns the negation of the operand's value.

Specified by:

applyTo in interface UnaryOperator

Returns:

the negation of the operand's value

Throws:

IllegalValueTypeException - if the value of the operand is not numeric

getIdentifier

public String getIdentifier()

Description copied from interface: Operator

Returns the operator's string identirifer.

Specified by:

getIdentifier in interface Operator

Returns:

a string representation of the operator.

isPrefix

public boolean isPrefix()

Description copied from interface: UnaryOperator

Returns whether the operator is a prefix operator, i.e. it appears before its operand.

Specified by:

isPrefix in interface UnaryOperator

Returns:

true for prefix operators, false for postfix operators

getOperandValueType

public Value.Type getOperandValueType()

Description copied from interface: Operator

Returns the type of value that the operator's operands can have.

Specified by:

getOperandValueType in interface Operator

Returns:

the type of value that the operator's operands can have

toString

public String toString()

Overrides:

toString in class Object