Module javafx.base

Package javafx.beans.binding

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()

Method Summary

Modifier and Type	Method	Description
ObjectExpression<Long>	asObject()	Creates an ObjectExpression that holds the value of this LongExpression.
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.

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.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 Detail

LongExpression

public LongExpression()

Method Detail

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

asObject

public ObjectExpression<Long> asObject()

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

Returns:

the new ObjectExpression

Since:

JavaFX 8.0