javafx.beans.property.adapter.ReadOnlyJavaBeanDoubleProperty Maven / Gradle / Ivy
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package javafx.beans.property.adapter;
import com.sun.javafx.property.MethodHelper;
import com.sun.javafx.property.adapter.Disposer;
import com.sun.javafx.property.adapter.ReadOnlyPropertyDescriptor;
import javafx.beans.property.ReadOnlyDoublePropertyBase;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.UndeclaredThrowableException;
import java.security.AccessController;
import java.security.AccessControlContext;
import java.security.PrivilegedAction;
/**
* A {@code ReadOnlyJavaBeanDoubleProperty} provides an adapter between a regular
* read only Java Bean property of type {@code double} or {@code Double} and a JavaFX
* {@code ReadOnlyDoubleProperty}. It cannot be created directly, but a
* {@link ReadOnlyJavaBeanDoublePropertyBuilder} has to be used.
*
* As a minimum, the Java Bean class must implement a getter for the
* property.
* The class, as well as the getter method, must be declared public.
* If the getter of an instance of this class is called, the property of
* the Java Bean is returned. If the Java Bean property is bound (i.e. it supports
* PropertyChangeListeners), this {@code ReadOnlyJavaBeanDoubleProperty} will be
* aware of changes in the Java Bean. Otherwise it can be notified about
* changes by calling {@link #fireValueChangedEvent()}.
*
* Deploying an Application as a Module
*
* If the Java Bean class is in a named module, then it must be reflectively
* accessible to the {@code javafx.base} module.
* A class is reflectively accessible if the module
* {@link Module#isOpen(String,Module) opens} the containing package to at
* least the {@code javafx.base} module.
*
*
* For example, if {@code com.foo.MyBeanClass} is in the {@code foo.app} module,
* the {@code module-info.java} might
* look like this:
*
*
{@code module foo.app {
opens com.foo to javafx.base;
}}
*
*
* Alternatively, a class is reflectively accessible if the module
* {@link Module#isExported(String) exports} the containing package
* unconditionally.
*
*
* @see javafx.beans.property.ReadOnlyDoubleProperty
* @see ReadOnlyJavaBeanDoublePropertyBuilder
* @since JavaFX 2.1
*/
public final class ReadOnlyJavaBeanDoubleProperty extends ReadOnlyDoublePropertyBase implements ReadOnlyJavaBeanProperty {
private final ReadOnlyPropertyDescriptor descriptor;
private final ReadOnlyPropertyDescriptor.ReadOnlyListener listener;
private final AccessControlContext acc = AccessController.getContext();
ReadOnlyJavaBeanDoubleProperty(ReadOnlyPropertyDescriptor descriptor, Object bean) {
this.descriptor = descriptor;
this.listener = descriptor.new ReadOnlyListener(bean, this);
descriptor.addListener(listener);
Disposer.addRecord(this, new DescriptorListenerCleaner(descriptor, listener));
}
/**
* {@inheritDoc}
*
* @throws UndeclaredThrowableException if calling the getter of the Java Bean
* property throws an {@code IllegalAccessException} or an
* {@code InvocationTargetException}.
*/
@Override
public double get() {
return AccessController.doPrivileged((PrivilegedAction) () -> {
try {
return ((Number)MethodHelper.invoke(
descriptor.getGetter(), getBean(), (Object[])null)).doubleValue();
} catch (IllegalAccessException e) {
throw new UndeclaredThrowableException(e);
} catch (InvocationTargetException e) {
throw new UndeclaredThrowableException(e);
}
}, acc);
}
/**
* {@inheritDoc}
*/
@Override
public Object getBean() {
return listener.getBean();
}
/**
* {@inheritDoc}
*/
@Override
public String getName() {
return descriptor.getName();
}
/**
* {@inheritDoc}
*/
@Override
public void fireValueChangedEvent() {
super.fireValueChangedEvent();
}
/**
* {@inheritDoc}
*/
@Override
public void dispose() {
descriptor.removeListener(listener);
}
}