bundles/common/org.eclipse.apogy.common.emf.ui/src/org/eclipse/apogy/common/emf/ui/composites/AbstractTimeSourceComposite.java

/*******************************************************************************
 * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency
 * 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:
 *     Pierre Allard, 
 *     Regent L'Archeveque,
 *     Olivier L. Larouche - initial API and implementation
 *
 * SPDX-License-Identifier: EPL-1.0
 *     
 *******************************************************************************/
package org.eclipse.apogy.common.emf.ui.composites;

import java.text.SimpleDateFormat;

import org.eclipse.apogy.common.databinding.converters.DateToStringConverter;
import org.eclipse.apogy.common.emf.ApogyCommonEMFPackage;
import org.eclipse.apogy.common.emf.TimeSource;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.beans.PojoProperties;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.databinding.EMFProperties;
import org.eclipse.emf.databinding.FeaturePath;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

public abstract class AbstractTimeSourceComposite extends Composite {
	public static final String DATE_FORMAT_STRING = "yyyy.MM.dd HH:mm:ss.SSS z";

	protected Label timeSourceTimeValueLabel;

	private DataBindingContext bindingContext;

	public AbstractTimeSourceComposite(Composite parent, int style) {
		super(parent, style);
		setLayout(new GridLayout(1, false));
		addDisposeListener(new DisposeListener() {
			@Override
			public void widgetDisposed(DisposeEvent e) {
				if (AbstractTimeSourceComposite.this.bindingContext != null) {
					AbstractTimeSourceComposite.this.bindingContext.dispose();
				}
			}
		});

		Composite top = new Composite(this, SWT.NONE);
//		top.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
		top.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false));
		top.setLayout(new GridLayout(2, false));

		Label startTimeLabel = new Label(top, SWT.NONE);
//		startTimeLabel.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
		startTimeLabel.setText("Source Time : ");

		this.timeSourceTimeValueLabel = new Label(top, SWT.NONE);
//		timeSourceTimeValueLabel.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
		this.timeSourceTimeValueLabel.setText("?");
		GridData startTimeValueLabelGridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
		startTimeValueLabelGridData.widthHint = 250;
		startTimeValueLabelGridData.minimumWidth = 250;
		this.timeSourceTimeValueLabel.setLayoutData(startTimeValueLabelGridData);
	}

	public abstract void activate(boolean active);

	public abstract TimeSource getTimeSource();

	public void setTimeSource(TimeSource timeSource) {
		if (this.bindingContext != null) {
			this.bindingContext.dispose();
			this.bindingContext = null;
		}

		if (timeSource != null) {
			this.bindingContext = initDataBindings();
		}
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	private DataBindingContext initDataBindings() {
		DataBindingContext bindingContext = new DataBindingContext();

		// Bind current time if applicable
		if (this.timeSourceTimeValueLabel != null) {
			IObservableValue timeSourceTimeLabelValue = PojoProperties.value("text")
					.observe(this.timeSourceTimeValueLabel);
			IObservableValue timeSourceTimeObserveValue = EMFProperties
					.value(FeaturePath.fromList(ApogyCommonEMFPackage.Literals.TIMED__TIME)).observe(getTimeSource());
			UpdateValueStrategy timeSourceTimeValueStrategy = new UpdateValueStrategy();
			timeSourceTimeValueStrategy
					.setConverter(new DateToStringConverter(new SimpleDateFormat(DATE_FORMAT_STRING)));
			bindingContext.bindValue(timeSourceTimeLabelValue, timeSourceTimeObserveValue,
					new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER), timeSourceTimeValueStrategy);
		}
		return bindingContext;
	}
}