Package org.geotools.filter.expression

Class SubtractImpl

Object

ExpressionAbstract

DefaultExpression

MathExpressionImpl

SubtractImpl

All Implemented Interfaces:

BinaryExpression, Expression, Subtract

public class SubtractImpl
extends MathExpressionImpl
implements Subtract

Implementation of Subtract expression.

Author:

Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org

Field Summary

Fields inherited from interface Expression

NIL

Fields inherited from interface Subtract

NAME

Constructor Summary

Constructors

Constructor	Description
SubtractImpl(Expression expr1, Expression expr2)

Method Summary

Modifier and Type	Method	Description
Object	accept(ExpressionVisitor visitor, Object extraData)	Accepts a visitor.
protected Object	doArithmeticOperation(Double operand1, Double operand2)
boolean	equals(Object obj)	Compares this expression to the specified object.
Object	evaluate(Object feature)	Subclass should override, default implementation returns null.
int	hashCode()	Override of hashCode method.
String	toString()

Methods inherited from class MathExpressionImpl

ensureOperandsSet, getExpression1, getExpression2, handleCollection, number, setExpression1, setExpression2

Methods inherited from class DefaultExpression

isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression

Methods inherited from class ExpressionAbstract

evaluate

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface BinaryExpression

getExpression1, getExpression2

Methods inherited from interface Expression

evaluate

Constructor Detail

SubtractImpl

public SubtractImpl(Expression expr1,
                    Expression expr2)

Method Detail

evaluate

public Object evaluate(Object feature)
                throws IllegalArgumentException

Description copied from class: ExpressionAbstract

Subclass should override, default implementation returns null.

Specified by:

evaluate in interface Expression

Overrides:

evaluate in class ExpressionAbstract

Returns:

default implementation returns null

Throws:

IllegalArgumentException

accept

public Object accept(ExpressionVisitor visitor,
                     Object extraData)

Description copied from interface: Expression

Accepts a visitor. Subclasses must implement with a method whose content is the following:

return visitor.visit(this, extraData);

Specified by:

accept in interface Expression

equals

public boolean equals(Object obj)

Compares this expression to the specified object. Returns true if the

Overrides:

equals in class Object

Parameters:

obj - - the object to compare this expression against.

Returns:

true if specified object is equal to this expression; false otherwise.

hashCode

public int hashCode()

Override of hashCode method.

Overrides:

hashCode in class Object

Returns:

a hash code value for this subtract expression.

toString

public String toString()

Overrides:

toString in class Object

doArithmeticOperation

protected Object doArithmeticOperation(Double operand1,
                                       Double operand2)

Specified by:

doArithmeticOperation in class MathExpressionImpl