javafx.beans.binding.DoubleExpression Maven / Gradle / Ivy
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*
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package javafx.beans.binding;
import javafx.beans.value.ObservableDoubleValue;
import javafx.beans.value.ObservableNumberValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import com.sun.javafx.collections.annotations.ReturnsUnmodifiableCollection;
import javafx.beans.value.ObservableValue;
/**
* A {@code DoubleExpression} is a
* {@link javafx.beans.value.ObservableDoubleValue} plus additional convenience
* methods to generate bindings in a fluent style.
*
* A concrete sub-class of {@code DoubleExpression} has to implement the method
* {@link javafx.beans.value.ObservableDoubleValue#get()}, which provides the
* actual value of this expression.
* @since JavaFX 2.0
*/
public abstract class DoubleExpression extends NumberExpressionBase implements
ObservableDoubleValue {
@Override
public int intValue() {
return (int) get();
}
@Override
public long longValue() {
return (long) get();
}
@Override
public float floatValue() {
return (float) get();
}
@Override
public double doubleValue() {
return get();
}
@Override
public Double getValue() {
return get();
}
/**
* Returns a {@code DoubleExpression} that wraps a
* {@link javafx.beans.value.ObservableDoubleValue}. If the
* {@code ObservableDoubleValue} is already a {@code DoubleExpression}, it
* will be returned. Otherwise a new
* {@link javafx.beans.binding.DoubleBinding} is created that is bound to
* the {@code ObservableDoubleValue}.
*
* @param value
* The source {@code ObservableDoubleValue}
* @return A {@code DoubleExpression} that wraps the
* {@code ObservableDoubleValue} if necessary
* @throws NullPointerException
* if {@code value} is {@code null}
*/
public static DoubleExpression doubleExpression(
final ObservableDoubleValue value) {
if (value == null) {
throw new NullPointerException("Value must be specified.");
}
return (value instanceof DoubleExpression) ? (DoubleExpression) value
: new DoubleBinding() {
{
super.bind(value);
}
@Override
public void dispose() {
super.unbind(value);
}
@Override
protected double computeValue() {
return value.get();
}
@Override
@ReturnsUnmodifiableCollection
public ObservableList getDependencies() {
return FXCollections.singletonObservableList(value);
}
};
}
/**
* Returns a {@code DoubleExpression} that wraps an
* {@link javafx.beans.value.ObservableValue}. If the
* {@code ObservableValue} is already a {@code DoubleExpression}, it
* will be returned. Otherwise a new
* {@link javafx.beans.binding.DoubleBinding} 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 DoubleExpression, which
* is essentially an {@code ObservableValue}. 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
*
* @param value
* The source {@code ObservableValue}
* @return A {@code DoubleExpression} that wraps the
* {@code ObservableValue} if necessary
* @throws NullPointerException
* if {@code value} is {@code null}
* @since JavaFX 8.0
*/
public static DoubleExpression doubleExpression(final ObservableValue value) {
if (value == null) {
throw new NullPointerException("Value must be specified.");
}
return (value instanceof DoubleExpression) ? (DoubleExpression) value
: new DoubleBinding() {
{
super.bind(value);
}
@Override
public void dispose() {
super.unbind(value);
}
@Override
protected double computeValue() {
final T val = value.getValue();
return val == null ? 0.0 : val.doubleValue();
}
@Override
@ReturnsUnmodifiableCollection
public ObservableList> getDependencies() {
return FXCollections.singletonObservableList(value);
}
};
}
@Override
public DoubleBinding negate() {
return (DoubleBinding) Bindings.negate(this);
}
@Override
public DoubleBinding add(final ObservableNumberValue other) {
return (DoubleBinding) Bindings.add(this, other);
}
@Override
public DoubleBinding add(final double other) {
return Bindings.add(this, other);
}
@Override
public DoubleBinding add(final float other) {
return (DoubleBinding) Bindings.add(this, other);
}
@Override
public DoubleBinding add(final long other) {
return (DoubleBinding) Bindings.add(this, other);
}
@Override
public DoubleBinding add(final int other) {
return (DoubleBinding) Bindings.add(this, other);
}
@Override
public DoubleBinding subtract(final ObservableNumberValue other) {
return (DoubleBinding) Bindings.subtract(this, other);
}
@Override
public DoubleBinding subtract(final double other) {
return Bindings.subtract(this, other);
}
@Override
public DoubleBinding subtract(final float other) {
return (DoubleBinding) Bindings.subtract(this, other);
}
@Override
public DoubleBinding subtract(final long other) {
return (DoubleBinding) Bindings.subtract(this, other);
}
@Override
public DoubleBinding subtract(final int other) {
return (DoubleBinding) Bindings.subtract(this, other);
}
@Override
public DoubleBinding multiply(final ObservableNumberValue other) {
return (DoubleBinding) Bindings.multiply(this, other);
}
@Override
public DoubleBinding multiply(final double other) {
return Bindings.multiply(this, other);
}
@Override
public DoubleBinding multiply(final float other) {
return (DoubleBinding) Bindings.multiply(this, other);
}
@Override
public DoubleBinding multiply(final long other) {
return (DoubleBinding) Bindings.multiply(this, other);
}
@Override
public DoubleBinding multiply(final int other) {
return (DoubleBinding) Bindings.multiply(this, other);
}
@Override
public DoubleBinding divide(final ObservableNumberValue other) {
return (DoubleBinding) Bindings.divide(this, other);
}
@Override
public DoubleBinding divide(final double other) {
return Bindings.divide(this, other);
}
@Override
public DoubleBinding divide(final float other) {
return (DoubleBinding) Bindings.divide(this, other);
}
@Override
public DoubleBinding divide(final long other) {
return (DoubleBinding) Bindings.divide(this, other);
}
@Override
public DoubleBinding divide(final int other) {
return (DoubleBinding) Bindings.divide(this, other);
}
/**
* Creates an {@link javafx.beans.binding.ObjectExpression} that holds the value
* of this {@code DoubleExpression}. If the
* value of this {@code DoubleExpression} 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(DoubleExpression.this);
}
@Override
public void dispose() {
unbind(DoubleExpression.this);
}
@Override
protected Double computeValue() {
return DoubleExpression.this.getValue();
}
};
}
}