javafx.beans.binding

Class DoubleExpression

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.DoubleExpression

All Implemented Interfaces:

NumberExpression

Direct Known Subclasses:

DoubleBinding

public abstract class DoubleExpression
extends NumberExpressionBase

DoubleExpression is an javafx.beans.value.ObservableDoubleValue plus additional convenience methods to generate bindings in a fluent style.

A concrete sub-class of DoubleExpression has to implement the method javafx.beans.value.ObservableDoubleValue#get(), which provides the actual value of this expression.

Since:

JavaFX 2.0

Constructor Summary

Constructors

Constructor and Description
DoubleExpression()

Method Summary

Modifier and Type	Method and Description
DoubleBinding	add(ObservableNumberValue other) Creates a new NumberBinding that calculates the sum of this NumberExpression and another javafx.beans.value.ObservableNumberValue.
ObjectExpression<java.lang.Double>	asObject() Creates an ObjectExpression that holds the value of this DoubleExpression.
DoubleBinding	divide(ObservableNumberValue other) Creates a new NumberBinding that calculates the division of this NumberExpression and another javafx.beans.value.ObservableNumberValue.
static <T extends java.lang.Number> DoubleExpression	doubleExpression(<any> value) Returns a DoubleExpression that wraps an javafx.beans.value.ObservableValue.
static DoubleExpression	doubleExpression(ObservableDoubleValue value) Returns a DoubleExpression that wraps a javafx.beans.value.ObservableDoubleValue.
double	doubleValue()
float	floatValue()
java.lang.Double	getValue()
int	intValue()
long	longValue()
DoubleBinding	multiply(ObservableNumberValue other) Creates a new NumberBinding that calculates the product of this NumberExpression and another javafx.beans.value.ObservableNumberValue.
DoubleBinding	negate() Creates a new NumberBinding that calculates the negation of NumberExpression.
DoubleBinding	subtract(ObservableNumberValue other) Creates a new NumberBinding that calculates the difference of this NumberExpression and another javafx.beans.value.ObservableNumberValue.

Methods inherited from class javafx.beans.binding.NumberExpressionBase

asString, asString, asString, greaterThan, greaterThanOrEqualTo, isEqualTo, isEqualTo, isNotEqualTo, isNotEqualTo, lessThan, lessThanOrEqualTo, numberExpression

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleExpression

public DoubleExpression()

Method Detail

intValue

public int intValue()

longValue

public long longValue()

floatValue

public float floatValue()

doubleValue

public double doubleValue()

getValue

public java.lang.Double getValue()

doubleExpression

public static DoubleExpression doubleExpression(ObservableDoubleValue value)

Returns a DoubleExpression that wraps a javafx.beans.value.ObservableDoubleValue. If the ObservableDoubleValue is already a DoubleExpression, it will be returned. Otherwise a new DoubleBinding is created that is bound to the ObservableDoubleValue.

Parameters:

value - The source ObservableDoubleValue

Returns:

A DoubleExpression that wraps the ObservableDoubleValue if necessary

Throws:

java.lang.NullPointerException - if value is null

doubleExpression

public static <T extends java.lang.Number> DoubleExpression doubleExpression(<any> value)

Returns a DoubleExpression that wraps an javafx.beans.value.ObservableValue. If the ObservableValue is already a DoubleExpression, it will be returned. Otherwise a new DoubleBinding is created that is bound to the ObservableValue.

Note: this method can be used to convert an ObjectExpression or javafx.beans.property.ObjectProperty of specific number type to DoubleExpression, which is essentially an ObservableValue<Number>. See sample below.

   DoubleProperty doubleProperty = new SimpleDoubleProperty(1.0);
   ObjectProperty<Double> objectProperty = new SimpleObjectProperty<>(2.0);
   BooleanBinding binding = doubleProperty.greaterThan(DoubleExpression.doubleExpression(objectProperty));
 

Note: null values will be interpreted as 0.0

Type Parameters:

T - The type of Number to be wrapped

Parameters:

value - The source ObservableValue

Returns:

A DoubleExpression that wraps the ObservableValue if necessary

Throws:

java.lang.NullPointerException - if value is null

Since:

JavaFX 8.0

negate

public DoubleBinding negate()

Description copied from interface: NumberExpression

Creates a new NumberBinding that calculates the negation of NumberExpression.

Returns:

the new NumberBinding

add

public DoubleBinding add(ObservableNumberValue other)

Description copied from interface: NumberExpression

Creates a new NumberBinding that calculates the sum of this NumberExpression and another javafx.beans.value.ObservableNumberValue.

Specified by:

add in interface NumberExpression

Overrides:

add in class NumberExpressionBase

Parameters:

other - the second ObservableNumberValue

Returns:

the new NumberBinding

subtract

public DoubleBinding subtract(ObservableNumberValue other)

Description copied from interface: NumberExpression

Creates a new NumberBinding that calculates the difference of this NumberExpression and another javafx.beans.value.ObservableNumberValue.

Specified by:

subtract in interface NumberExpression

Overrides:

subtract in class NumberExpressionBase

Parameters:

other - the second ObservableNumberValue

Returns:

the new NumberBinding

multiply

public DoubleBinding multiply(ObservableNumberValue other)

Description copied from interface: NumberExpression

Creates a new NumberBinding that calculates the product of this NumberExpression and another javafx.beans.value.ObservableNumberValue.

Specified by:

multiply in interface NumberExpression

Overrides:

multiply in class NumberExpressionBase

Parameters:

other - the second ObservableNumberValue

Returns:

the new NumberBinding

divide

public DoubleBinding divide(ObservableNumberValue other)

Description copied from interface: NumberExpression

Creates a new NumberBinding that calculates the division of this NumberExpression and another javafx.beans.value.ObservableNumberValue.

Specified by:

divide in interface NumberExpression

Overrides:

divide in class NumberExpressionBase

Parameters:

other - the second ObservableNumberValue

Returns:

the new NumberBinding

asObject

public ObjectExpression<java.lang.Double> asObject()

Creates an ObjectExpression that holds the value of this DoubleExpression. If the value of this DoubleExpression changes, the value of the ObjectExpression will be updated automatically.

Returns:

the new ObjectExpression

Since:

JavaFX 8.0