MathExpressionImpl (Geotools modules 31-SNAPSHOT API)

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 Description

protected MathExpressionImpl()
No argument constructor.

protected MathExpressionImpl(Expression e1, Expression e2)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	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)