csheets.core.formula.lang
Class RelationalOperator

java.lang.Object
  csheets.core.formula.lang.RelationalOperator

All Implemented Interfaces:

BinaryOperator, Operator, Serializable

Direct Known Subclasses:

Equal, GreaterThan, GreaterThanOrEqual, LessThan, LessThanOrEqual, NotEqual

public abstract class RelationalOperator
extends Object
implements BinaryOperator

A relational operator.

Author:

Einar Pehrson

See Also:

Serialized Form

Constructor Summary

RelationalOperator()
Creates a new relational operator.

Method Summary

Value	applyTo(Expression leftOperand, Expression rightOperand) Applies the operator to the given operands and returns the result.
abstract <T> boolean	compare(Comparable<T> left, T right) Applies the operator to the given operands and returns a boolean value.
Value.Type	getOperandValueType() Returns the type of value that the operator's operands can have.
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface csheets.core.formula.Operator

getIdentifier

Constructor Detail

RelationalOperator

public RelationalOperator()

Creates a new relational operator.

Method Detail

applyTo

public final Value applyTo(Expression leftOperand,
                           Expression rightOperand)
                    throws IllegalValueTypeException

Description copied from interface: BinaryOperator

Applies the operator to the given operands and returns the result.

Specified by:

applyTo in interface BinaryOperator

Returns:

the result of the operation

Throws:

IllegalValueTypeException - if the value of an operand is not of the expected type

compare

public abstract <T> boolean compare(Comparable<T> left,
                                    T right)

Applies the operator to the given operands and returns a boolean value.

Parameters:

left - the value of the left operand

right - the value of the right operand

Returns:

the result of the comparison

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