Module javafx.base

Package javafx.beans.binding

Class DoubleExpression

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.DoubleExpression

All Implemented Interfaces:

NumberExpression, Observable, ObservableDoubleValue, ObservableNumberValue, ObservableValue<Number>

Direct Known Subclasses:

DoubleBinding, ReadOnlyDoubleProperty

public abstract class DoubleExpression
extends NumberExpressionBase
implements ObservableDoubleValue

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

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

Since:

JavaFX 2.0

Constructor Summary

Constructors

Constructor	Description
DoubleExpression()

Method Summary

Modifier and Type	Method	Description
ObjectExpression<Double>	asObject()	Creates an ObjectExpression that holds the value of this DoubleExpression.
static DoubleExpression	doubleExpression(ObservableDoubleValue value)	Returns a DoubleExpression that wraps a ObservableDoubleValue.
static <T extends Number> DoubleExpression	doubleExpression(ObservableValue<T> value)	Returns a DoubleExpression that wraps an ObservableValue.

Methods declared in interface javafx.beans.binding.NumberExpression

add, add, add, add, add, asString, asString, asString, divide, divide, divide, divide, divide, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, lessThan, lessThan, lessThan, lessThan, lessThan, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, multiply, multiply, multiply, multiply, multiply, negate, subtract, subtract, subtract, subtract, subtract

Methods declared in class javafx.beans.binding.NumberExpressionBase

numberExpression

Methods declared in class java.lang.Object

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

Methods declared in interface javafx.beans.Observable

addListener, removeListener

Methods declared in interface javafx.beans.value.ObservableDoubleValue

get

Methods declared in interface javafx.beans.value.ObservableNumberValue

doubleValue, floatValue, intValue, longValue

Methods declared in interface javafx.beans.value.ObservableValue

addListener, getValue, removeListener

Constructor Detail

DoubleExpression

public DoubleExpression()

Method Detail

doubleExpression

public static DoubleExpression doubleExpression(ObservableDoubleValue value)

Returns a DoubleExpression that wraps a 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:

NullPointerException - if value is null

doubleExpression

public static <T extends Number> DoubleExpression doubleExpression(ObservableValue<T> value)

Returns a DoubleExpression that wraps an 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 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:

NullPointerException - if value is null

Since:

JavaFX 8.0

asObject

public ObjectExpression<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