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 Details

    • LongExpression

      public LongExpression()

  • 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 Long getValue()
      Description copied from interface: ObservableValue
      Returns the current value of this ObservableValue
      Specified by:
      getValue in interface ObservableValue<Number>
      Returns:
      The current value

    • 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