bundles/runtime/org.eclipse.fx.core.di.context/src/org/eclipse/fx/core/di/context/internal/PropertyAdapterProvider_Value.java

/*******************************************************************************
 * Copyright (c) 2013 BestSolution.at and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
 *******************************************************************************/
package org.eclipse.fx.core.di.context.internal;

import org.eclipse.fx.core.Callback;
import org.eclipse.fx.core.adapter.AdapterProvider;
import org.eclipse.fx.core.adapter.AdapterService.ValueAccess;
import org.eclipse.fx.core.preferences.Value;
import org.osgi.service.component.annotations.Component;

import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.Property;
import javafx.beans.property.SimpleObjectProperty;

/**
 * JavaFX Property adapter provider
 */
@SuppressWarnings("rawtypes")
@Component
public class PropertyAdapterProvider_Value implements AdapterProvider<Value, Property> {

	@Override
	public Class<Value> getSourceType() {
		return Value.class;
	}

	@Override
	public Class<Property> getTargetType() {
		return Property.class;
	}

	@Override
	public boolean canAdapt(Value sourceObject, Class<Property> targetType) {
		return true;
	}

	@SuppressWarnings("unchecked")
	@Override
	public Property adapt(final Value sourceObject, Class<Property> targetType, ValueAccess... valueAccess) {
		final SimpleObjectProperty<Object> rv = new SimpleObjectProperty<>(sourceObject.getValue());
		final InvalidationListener l = new InvalidationListener() {

			@Override
			public void invalidated(Observable observable) {
				sourceObject.publish(rv.get());
			}
		};
		rv.addListener(l);
		sourceObject.subscribeOnValueChange(new Callback() {

			@Override
			public void call(Object value) {
				if (rv.get() == null && value == null)
					return;
				if (rv.get() != null && rv.get().equals(value))
					return;
				rv.set(value);
			}
		});
		sourceObject.subscribeOnDispose(new Callback() {

			@Override
			public void call(Object value) {
				rv.removeListener(l);
			}
		});
		return rv;
	}

}