org.eclipse.osbp.runtime.web.vaadin.databinding/src/org/eclipse/osbp/runtime/web/vaadin/databinding/component/internal/ComponentListener.java

/**
 * Copyright (c) 2011, 2015 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 * 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:
 *         Florian Pirchner - Initial implementation
 */
package org.eclipse.osbp.runtime.web.vaadin.databinding.component.internal;

import java.lang.reflect.Method;
import java.util.Arrays;

import org.eclipse.core.databinding.property.IProperty;
import org.eclipse.core.databinding.property.ISimplePropertyListener;
import org.eclipse.core.databinding.property.NativePropertyListener;

import com.vaadin.event.MethodEventSource;
import com.vaadin.ui.Component;
import com.vaadin.ui.Component.Event;
import com.vaadin.util.ReflectTools;

// TODO: Auto-generated Javadoc
/**
 * The listener interface for receiving component events. The class that is
 * interested in processing a component event implements this interface, and the
 * object created with that class is registered with a component using the
 * component's <code>addComponentListener</code> method. When
 * the component event occurs, that object's appropriate
 * method is invoked.
 *
 * @see #componentEvent
 */
@SuppressWarnings("serial")
public class ComponentListener extends NativePropertyListener implements
		Component.Listener {

	/** The Constant COMPONENT_EVENT_METHOD. */
	public static final Method COMPONENT_EVENT_METHOD = ReflectTools
			.findMethod(ComponentListener.class, "componentEvent",
					Component.Event.class);

	/** The change events. */
	private final Class<? extends Component.Event>[] changeEvents;
	
	/** The stale events. */
	private final Class<? extends Component.Event>[] staleEvents;

	/**
	 * Instantiates a new component listener.
	 *
	 * @param property
	 *            the property
	 * @param listener
	 *            the listener
	 * @param changeEvents
	 *            the change events
	 * @param staleEvents
	 *            the stale events
	 */
	public ComponentListener(IProperty property,
			ISimplePropertyListener listener,
			Class<? extends Component.Event>[] changeEvents,
			Class<? extends Component.Event>[] staleEvents) {
		super(property, listener);
		this.changeEvents = Arrays.copyOf(changeEvents, changeEvents.length);
		this.staleEvents = Arrays.copyOf(staleEvents, staleEvents.length);
	}

	/* (non-Javadoc)
	 * @see com.vaadin.ui.Component.Listener#componentEvent(com.vaadin.ui.Component.Event)
	 */
	@Override
	public void componentEvent(com.vaadin.ui.Component.Event event) {
		if (staleEvents != null) {
			for (int i = 0; i < staleEvents.length; i++) {
				if (event.getClass().isAssignableFrom(staleEvents[i])) {
					fireStale(event.getComponent());
					break;
				}
			}
		}
		if (changeEvents != null) {
			for (int i = 0; i < changeEvents.length; i++) {
				if (event.getClass().isAssignableFrom(changeEvents[i])) {
					fireChange(event.getComponent(), null);
					break;
				}
			}
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.databinding.property.NativePropertyListener#doAddTo(java.lang.Object)
	 */
	protected void doAddTo(Object source) {
		Component widget = (Component) source;
		if (changeEvents != null) {
			for (int i = 0; i < changeEvents.length; i++) {
				Class<? extends Event> event = changeEvents[i];
				if (event != null) {
					ComponentListenerUtil.asyncAddListener(
							(MethodEventSource) widget, event, this,
							COMPONENT_EVENT_METHOD);
				}
			}
		}
		if (staleEvents != null) {
			for (int i = 0; i < staleEvents.length; i++) {
				Class<? extends Event> event = staleEvents[i];
				if (event != null) {
					ComponentListenerUtil.asyncAddListener(
							(MethodEventSource) widget, event, this,
							COMPONENT_EVENT_METHOD);
				}
			}
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.databinding.property.NativePropertyListener#doRemoveFrom(java.lang.Object)
	 */
	protected void doRemoveFrom(Object source) {
		Component widget = (Component) source;
		if (changeEvents != null) {
			for (int i = 0; i < changeEvents.length; i++) {
				Class<? extends Event> event = changeEvents[i];
				if (event != null) {
					ComponentListenerUtil.asyncRemoveListener(
							(MethodEventSource) widget, event, this,
							COMPONENT_EVENT_METHOD);
				}
			}
		}
		if (staleEvents != null) {
			for (int i = 0; i < staleEvents.length; i++) {
				Class<? extends Event> event = staleEvents[i];
				if (event != null) {
					ComponentListenerUtil.asyncRemoveListener(
							(MethodEventSource) widget, event, this,
							COMPONENT_EVENT_METHOD);
				}
			}
		}
	}

}