org.geotools.filter

Class MathExpressionImpl

Object

ExpressionAbstract

DefaultExpression

MathExpressionImpl

All Implemented Interfaces:

BinaryExpression, Expression

Direct Known Subclasses:

AddImpl, DivideImpl, MultiplyImpl, SubtractImpl

public abstract class MathExpressionImpl
extends DefaultExpression
implements BinaryExpression

Holds a mathematical relationship between two expressions. Note that the sub expressions must be math expressions. In other words, they must be a math literal, another math expression, or a feature attribute with a declared math type. You may create math expressions of arbitrary complexity by nesting other math expressions as sub expressions in one or more math expressions. This filter defines left and right values to clarify the sub expression precedence for non-associative operations, such as subtraction and division. For example, the left value is the numerator and the right is the denominator in an ExpressionMath division operation.

Author:

Rob Hranac, Vision for New York

Field Summary

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MathExpressionImpl() No argument constructor.
protected	MathExpressionImpl(Expression e1, Expression e2)

Method Summary

Modifier and Type	Method and Description
protected abstract Object	doArithmeticOperation(Double operand1, Double operand2)
protected void	ensureOperandsSet() Convenience method which ensures that both expressions have been set.
Expression	getExpression1() Gets the left or first expression.
Expression	getExpression2() Gets the second expression.
protected Object	handleCollection(Object value1, Object value2)
protected Object	number(double number)
void	setExpression1(Expression expression) Gets the left or first expression.
void	setExpression2(Expression expression) Gets the second expression.

Methods inherited from class DefaultExpression

isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression

Methods inherited from class ExpressionAbstract

evaluate, evaluate

Methods inherited from class Object

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

Methods inherited from interface Expression

accept, evaluate, evaluate

Constructor Detail

MathExpressionImpl

protected MathExpressionImpl()

No argument constructor.

MathExpressionImpl

protected MathExpressionImpl(Expression e1,
                             Expression e2)

Method Detail

getExpression1

public Expression getExpression1()

Gets the left or first expression.

Specified by:

getExpression1 in interface BinaryExpression

Returns:

the expression on the first side of the comparison.

setExpression1

public void setExpression1(Expression expression)

Gets the left or first expression.

getExpression2

public Expression getExpression2()

Gets the second expression.

Specified by:

getExpression2 in interface BinaryExpression

Returns:

the expression on the second side of the comparison.

setExpression2

public void setExpression2(Expression expression)

Gets the second expression.

ensureOperandsSet

protected void ensureOperandsSet()
                          throws IllegalArgumentException

Convenience method which ensures that both expressions have been set. If any of operands not set an exception is thrown.

Throws:

IllegalArgumentException

number

protected Object number(double number)

handleCollection

protected Object handleCollection(Object value1,
                                  Object value2)

doArithmeticOperation

protected abstract Object doArithmeticOperation(Double operand1,
                                                Double operand2)