org.lunifera.runtime.web.vaadin.databinding.VaadinValueProperty.java Source code

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Here is the source code for org.lunifera.runtime.web.vaadin.databinding.VaadinValueProperty.java

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/*******************************************************************************
 * Copyright (c) 2012 by committers of lunifera.org
    
 * 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
 * 
 * Original source based on org.eclipse.jface.databinding.swt.WidgetValueProperty (EPL)
 * 
 * Contributor:
 *       Florian Pirchner - porting swt databinding to support vaadin
 * 
 *******************************************************************************/

package org.lunifera.runtime.web.vaadin.databinding;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.property.INativePropertyListener;
import org.eclipse.core.databinding.property.ISimplePropertyListener;
import org.eclipse.core.databinding.property.value.SimpleValueProperty;
import org.lunifera.runtime.web.vaadin.databinding.component.internal.ComponentListener;
import org.lunifera.runtime.web.vaadin.databinding.component.internal.VaadinObservableComponentValueDecorator;

import com.vaadin.ui.Component;

/**
 * Abstract value property implementation for {@link Component} properties. This
 * class implements some basic behavior that widget properties are generally
 * expected to have, namely:
 * <ul>
 * <li>Calling {@link #observe(Object)} should create the observable on the UI
 * realm of the widget, rather than the current default realm
 * <li>All <code>observe()</code> methods should return an
 * {@link IVaadinComponentObservableValue}
 * </ul>
 * This class also provides a default widget listener implementation using
 * vaadins event concept. Subclasses may pass one or more vaadin event types
 * (sub class of {@link Component.Event}) to the super constructor to indicate
 * which events signal a property change.
 */
public abstract class VaadinValueProperty extends SimpleValueProperty implements IComponentValueProperty {
    private Class<? extends Component.Event>[] changeEvents;
    private Class<? extends Component.Event>[] staleEvents;

    /**
     * Constructs a ComponentValueProperty which does not listen for any vaadin
     * events.
     */
    protected VaadinValueProperty() {
        this(null, null);
    }

    /**
     * Constructs a ComponentValueProperty with the specified vaadin event type
     * 
     * @param changeEvent
     *            vaadin event type of the event that signifies a property
     *            change.
     */
    @SuppressWarnings("unchecked")
    protected VaadinValueProperty(Class<? extends Component.Event> changeEvent) {
        this(new Class[] { changeEvent }, null);
    }

    /**
     * Constructs a ComponentValueProperty with the specified vaadin event
     * type(s).
     * 
     * @param changeEvents
     *            array of vaadin event types of the events that signify a
     *            property change.
     */
    protected VaadinValueProperty(Class<? extends Component.Event>[] changeEvents) {
        this(changeEvents, null);
    }

    /**
     * Constructs a ComponentValueProperty with the specified vaadin event
     * types.
     * 
     * @param changeEvents
     *            array of vaadin event types of the events that signify a
     *            property change.
     * @param staleEvents
     *            array of vaadin event types of the events that signify a
     *            property became stale.
     */
    public VaadinValueProperty(Class<? extends Component.Event>[] changeEvents,
            Class<? extends Component.Event>[] staleEvents) {
        this.changeEvents = changeEvents;
        this.staleEvents = staleEvents;
    }

    public INativePropertyListener adaptListener(ISimplePropertyListener listener) {
        if (changeEvents == null && staleEvents == null)
            return null;
        return new ComponentListener(this, listener, changeEvents, staleEvents);
    }

    public IVaadinComponentObservableValue observe(Object source) {
        if (source instanceof Component) {
            return observe((Component) source);
        }
        return (IVaadinComponentObservableValue) super.observe(source);
    }

    public IObservableValue observe(Realm realm, Object source) {
        return wrapObservable(super.observe(realm, source), (Component) source);
    }

    protected IVaadinComponentObservableValue wrapObservable(IObservableValue observable, Component component) {
        return new VaadinObservableComponentValueDecorator(observable, component);
    }

    public IVaadinComponentObservableValue observe(Component component) {
        return (IVaadinComponentObservableValue) observe(VaadinObservables.getRealm(component.getUI()), component);
    }

    public IVaadinComponentObservableValue observeDelayed(int delay, Component component) {
        throw new IllegalStateException("Delayed not allowed");
    }
}