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

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`.
`double`	`doubleValue()`	Returns the value of this `ObservableNumberValue` as a `double`.
`float`	`floatValue()`	Returns the value of this `ObservableNumberValue` as a `float`.
`Double`	`getValue()`	Returns the current value of this `ObservableValue`
`int`	`intValue()`	Returns the value of this `ObservableNumberValue` as an `int` .
`long`	`longValue()`	Returns the value of this `ObservableNumberValue` as a `long` .
`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

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, 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, subscribe

Methods declared in interface javafx.beans.value.ObservableDoubleValue

get

Methods declared in interface javafx.beans.value.ObservableValue

addListener, flatMap, map, orElse, removeListener, subscribe, subscribe, when

Constructor Details

DoubleExpression

public DoubleExpression()

Creates a default DoubleExpression.

Method Details

intValue

public int intValue()

Description copied from interface: ObservableNumberValue

Returns the value of this ObservableNumberValue as an int . If the value is not an int, a standard cast is performed.

Specified by:: intValue in interface ObservableNumberValue
Returns:: The value of this ObservableNumberValue as an int

longValue

public long longValue()

Description copied from interface: ObservableNumberValue

Returns the value of this ObservableNumberValue as a long . If the value is not a long, a standard cast is performed.

Specified by:: longValue in interface ObservableNumberValue
Returns:: The value of this ObservableNumberValue as a long

floatValue

public float floatValue()

Description copied from interface: ObservableNumberValue

Returns the value of this ObservableNumberValue as a float. If the value is not a float, a standard cast is performed.

Specified by:: floatValue in interface ObservableNumberValue
Returns:: The value of this ObservableNumberValue as a float

doubleValue

public double doubleValue()

Description copied from interface: ObservableNumberValue

Returns the value of this ObservableNumberValue as a double. If the value is not a double, a standard cast is performed.

Specified by:: doubleValue in interface ObservableNumberValue
Returns:: The value of this ObservableNumberValue as a double

getValue

public Double getValue()

Description copied from interface: ObservableValue

Returns the current value of this ObservableValue

Specified by:: getValue in interface ObservableValue<Number>
Returns:: The current value

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