Class LongExpression

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.LongExpression

All Implemented Interfaces:: NumberExpression, Observable, ObservableLongValue, ObservableNumberValue, ObservableValue<Number>

Direct Known Subclasses:: LongBinding, ReadOnlyLongProperty

public abstract class LongExpression
extends NumberExpressionBase
implements ObservableLongValue

LongExpression is an ObservableLongValue plus additional convenience methods to generate bindings in a fluent style.

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

Since:: JavaFX 2.0

Constructor Summary

Constructors
Constructor	Description
`LongExpression()`	Creates a default `LongExpression`.

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.
`FloatBinding`	`add(float other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`LongBinding`	`add(int other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`LongBinding`	`add(long other)`	Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
`ObjectExpression<Long>`	`asObject()`	Creates an `ObjectExpression` that holds the value of this `LongExpression`.
`DoubleBinding`	`divide(double other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`FloatBinding`	`divide(float other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`LongBinding`	`divide(int other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`LongBinding`	`divide(long other)`	Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
`static LongExpression`	`longExpression(ObservableLongValue value)`	Returns a `LongExpression` that wraps a `ObservableLongValue`.
`static <T extends Number> LongExpression`	`longExpression(ObservableValue<T> value)`	Returns a `LongExpression` that wraps an `ObservableValue`.
`DoubleBinding`	`multiply(double other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`FloatBinding`	`multiply(float other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`LongBinding`	`multiply(int other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`LongBinding`	`multiply(long other)`	Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
`LongBinding`	`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.
`FloatBinding`	`subtract(float other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
`LongBinding`	`subtract(int other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
`LongBinding`	`subtract(long other)`	Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.

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

add, asString, asString, asString, 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, subtract

Methods declared in interface javafx.beans.Observable

addListener, removeListener

Methods declared in interface javafx.beans.value.ObservableLongValue

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

LongExpression

public LongExpression()

Creates a default LongExpression.

Method Details

longExpression

public static LongExpression longExpression(ObservableLongValue value)

Returns a LongExpression that wraps a ObservableLongValue. If the ObservableLongValue is already a LongExpression, it will be returned. Otherwise a new LongBinding is created that is bound to the ObservableLongValue.

Parameters:: value - The source ObservableLongValue
Returns:: A LongExpression that wraps the ObservableLongValue if necessary
Throws:: NullPointerException - if value is null

longExpression

public static <T extends Number> LongExpression longExpression(ObservableValue<T> value)

Returns a LongExpression that wraps an ObservableValue. If the ObservableValue is already a LongExpression, it will be returned. Otherwise a new LongBinding 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 LongExpression, which is essentially an ObservableValue<Number>. See sample below.

   LongProperty longProperty = new SimpleLongProperty(1L);
   ObjectProperty<Long> objectProperty = new SimpleObjectProperty<>(2L);
   BooleanBinding binding = longProperty.greaterThan(LongExpression.longExpression(objectProperty));

Note: null values will be interpreted as 0L

Type Parameters:: T - The type of Number to be wrapped
Parameters:: value - The source ObservableValue
Returns:: A LongExpression that wraps the ObservableValue if necessary
Throws:: NullPointerException - if value is null
Since:: JavaFX 8.0