javafx.beans.binding.LongExpression Maven / Gradle / Ivy
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package javafx.beans.binding;
import javafx.beans.value.ObservableLongValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.beans.value.ObservableValue;
/**
* {@code LongExpression} is an {@link javafx.beans.value.ObservableLongValue}
* plus additional convenience methods to generate bindings in a fluent style.
*
* A concrete sub-class of {@code LongExpression} has to implement the method
* {@link javafx.beans.value.ObservableLongValue#get()}, which provides the
* actual value of this expression.
* @since JavaFX 2.0
*/
public abstract class LongExpression extends NumberExpressionBase implements
ObservableLongValue {
@Override
public int intValue() {
return (int) get();
}
@Override
public long longValue() {
return get();
}
@Override
public float floatValue() {
return (float) get();
}
@Override
public double doubleValue() {
return (double) get();
}
@Override
public Long getValue() {
return get();
}
/**
* Returns a {@code LongExpression} that wraps a
* {@link javafx.beans.value.ObservableLongValue}. If the
* {@code ObservableLongValue} is already a {@code LongExpression}, it will
* be returned. Otherwise a new {@link javafx.beans.binding.LongBinding} is
* created that is bound to the {@code ObservableLongValue}.
*
* @param value
* The source {@code ObservableLongValue}
* @return A {@code LongExpression} that wraps the
* {@code ObservableLongValue} if necessary
* @throws NullPointerException
* if {@code value} is {@code null}
*/
public static LongExpression longExpression(final ObservableLongValue value) {
if (value == null) {
throw new NullPointerException("Value must be specified.");
}
return (value instanceof LongExpression) ? (LongExpression) value
: new LongBinding() {
{
super.bind(value);
}
@Override
public void dispose() {
super.unbind(value);
}
@Override
protected long computeValue() {
return value.get();
}
@Override
public ObservableList getDependencies() {
return FXCollections.singletonObservableList(value);
}
};
}
/**
* Returns a {@code LongExpression} that wraps an
* {@link javafx.beans.value.ObservableValue}. If the
* {@code ObservableValue} is already a {@code LongExpression}, it
* will be returned. Otherwise a new
* {@link javafx.beans.binding.LongBinding} is created that is bound to
* the {@code ObservableValue}.
*
*
* Note: this method can be used to convert an {@link ObjectExpression} or
* {@link javafx.beans.property.ObjectProperty} of specific number type to LongExpression, which
* is essentially an {@code ObservableValue}. 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
*
* @param The type of Number to be wrapped
* @param value
* The source {@code ObservableValue}
* @return A {@code LongExpression} that wraps the
* {@code ObservableValue} if necessary
* @throws NullPointerException
* if {@code value} is {@code null}
* @since JavaFX 8.0
*/
public static LongExpression longExpression(final ObservableValue value) {
if (value == null) {
throw new NullPointerException("Value must be specified.");
}
return (value instanceof LongExpression) ? (LongExpression) value
: new LongBinding() {
{
super.bind(value);
}
@Override
public void dispose() {
super.unbind(value);
}
@Override
protected long computeValue() {
final T val = value.getValue();
return val == null ? 0L : val.longValue();
}
@Override
public ObservableList> getDependencies() {
return FXCollections.singletonObservableList(value);
}
};
}
@Override
public LongBinding negate() {
return (LongBinding) Bindings.negate(this);
}
@Override
public DoubleBinding add(final double other) {
return Bindings.add(this, other);
}
@Override
public FloatBinding add(final float other) {
return (FloatBinding) Bindings.add(this, other);
}
@Override
public LongBinding add(final long other) {
return (LongBinding) Bindings.add(this, other);
}
@Override
public LongBinding add(final int other) {
return (LongBinding) Bindings.add(this, other);
}
@Override
public DoubleBinding subtract(final double other) {
return Bindings.subtract(this, other);
}
@Override
public FloatBinding subtract(final float other) {
return (FloatBinding) Bindings.subtract(this, other);
}
@Override
public LongBinding subtract(final long other) {
return (LongBinding) Bindings.subtract(this, other);
}
@Override
public LongBinding subtract(final int other) {
return (LongBinding) Bindings.subtract(this, other);
}
@Override
public DoubleBinding multiply(final double other) {
return Bindings.multiply(this, other);
}
@Override
public FloatBinding multiply(final float other) {
return (FloatBinding) Bindings.multiply(this, other);
}
@Override
public LongBinding multiply(final long other) {
return (LongBinding) Bindings.multiply(this, other);
}
@Override
public LongBinding multiply(final int other) {
return (LongBinding) Bindings.multiply(this, other);
}
@Override
public DoubleBinding divide(final double other) {
return Bindings.divide(this, other);
}
@Override
public FloatBinding divide(final float other) {
return (FloatBinding) Bindings.divide(this, other);
}
@Override
public LongBinding divide(final long other) {
return (LongBinding) Bindings.divide(this, other);
}
@Override
public LongBinding divide(final int other) {
return (LongBinding) Bindings.divide(this, other);
}
/**
* Creates an {@link javafx.beans.binding.ObjectExpression} that holds the value
* of this {@code LongExpression}. If the
* value of this {@code LongExpression} changes, the value of the
* {@code ObjectExpression} will be updated automatically.
*
* @return the new {@code ObjectExpression}
* @since JavaFX 8.0
*/
public ObjectExpression asObject() {
return new ObjectBinding() {
{
bind(LongExpression.this);
}
@Override
public void dispose() {
unbind(LongExpression.this);
}
@Override
protected Long computeValue() {
return LongExpression.this.getValue();
}
};
}
}