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()`	Creates a default `DoubleExpression`.

Method Summary

Modifier and Type	Method	Description
`DoubleBinding`	`add(double other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`DoubleBinding`	`add(float other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`DoubleBinding`	`add(int other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`DoubleBinding`	`add(long other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`DoubleBinding`	`add(ObservableNumberValue other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and another `ObservableNumberValue`.
`ObjectExpression<Double>`	`asObject()`	Creates an `ObjectExpression` that holds the value of this `DoubleExpression`.
`DoubleBinding`	`divide(double other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`DoubleBinding`	`divide(float other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`DoubleBinding`	`divide(int other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`DoubleBinding`	`divide(long other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`DoubleBinding`	`divide(ObservableNumberValue other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and another `ObservableNumberValue`.
`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`.
`DoubleBinding`	`multiply(double other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`DoubleBinding`	`multiply(float other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`DoubleBinding`	`multiply(int other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`DoubleBinding`	`multiply(long other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`DoubleBinding`	`multiply(ObservableNumberValue other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and another `ObservableNumberValue`.
`DoubleBinding`	`negate()`	Creates a new `NumberBinding` that calculates the negation of `NumberExpression`.
`DoubleBinding`	`subtract(double other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
`DoubleBinding`	`subtract(float other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
`DoubleBinding`	`subtract(int other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
`DoubleBinding`	`subtract(long other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
`DoubleBinding`	`subtract(ObservableNumberValue other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and another `ObservableNumberValue`.

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.binding.NumberExpression

asString, asString, asString, 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

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 Details

DoubleExpression

public DoubleExpression()

Creates a default DoubleExpression.

Method Details

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