SelectAncestorDialog.java

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *     Matt McCutchen (hashproduct+eclipse@gmail.com) - Bug 35390 Three-way compare cannot select (mis-selects) )ancestor resource
 *     Aleksandra Wozniak (aleksandra.k.wozniak@gmail.com) - Bug 239959
 *     Mikael Barbero (mikael.barbero@obeo.fr) - adapted to EMF Compare
 *******************************************************************************/
package org.eclipse.emf.compare.ide.ui.internal.handler;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.eclipse.compare.internal.CompareMessages;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.compare.ide.ui.source.IEMFComparisonSource;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.edit.provider.IItemLabelProvider;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.model.IWorkbenchAdapter;

/* Initially copy/pasted from org.eclipse.compare.internal.ResourceCompareInput.SelectAncestorDialog. */
public class SelectAncestorDialog<T> extends MessageDialog {
	private List<T> elements;

	T originElement;

	T leftElement;

	T rightElement;

	private Button[] buttons;

	private final AdapterFactory adapterFactory;

	public SelectAncestorDialog(Shell parentShell, AdapterFactory adapterFactory, T[] theResources) {
		super(parentShell, CompareMessages.SelectAncestorDialog_title, null,
				CompareMessages.SelectAncestorDialog_message, MessageDialog.QUESTION,
				new String[] {IDialogConstants.OK_LABEL, IDialogConstants.CANCEL_LABEL }, 0);
		this.adapterFactory = adapterFactory;
		this.elements = new ArrayList<T>(Arrays.asList(theResources));
	}

	@Override
	protected Control createCustomArea(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		composite.setLayout(new GridLayout());
		buttons = new Button[3];
		for (int i = 0; i < 3; i++) {
			buttons[i] = new Button(composite, SWT.RADIO);
			buttons[i].addSelectionListener(selectionListener);
			String text = "'" + getText(elements.get(i)) + "'"; //$NON-NLS-1$ //$NON-NLS-2$
			if (elements.get(i) instanceof EObject) {
				text = text + " (" + EcoreUtil.getURI(((EObject)elements.get(i))) + ")"; //$NON-NLS-1$ //$NON-NLS-2$
			}
			buttons[i].setText(text);
			buttons[i].setFont(parent.getFont());
			// set initial state
			buttons[i].setSelection(i == 0);
		}
		pickOrigin(0);
		return composite;
	}

	private void pickOrigin(int i) {
		originElement = elements.get(i);
		leftElement = elements.get(i == 0 ? 1 : 0);
		rightElement = elements.get(i == 2 ? 1 : 2);
	}

	private SelectionListener selectionListener = new SelectionAdapter() {
		@Override
		public void widgetSelected(SelectionEvent e) {
			Button selectedButton = (Button)e.widget;
			if (!selectedButton.getSelection()) {
				return;
			}
			for (int i = 0; i < 3; i++) {
				if (selectedButton == buttons[i]) {
					pickOrigin(i);
				}
			}
		}
	};

	private String getText(Object object) {
		IEMFComparisonSource emfComparisonSourceAdapter = (IEMFComparisonSource)Platform.getAdapterManager()
				.getAdapter(object, IEMFComparisonSource.class);
		if (emfComparisonSourceAdapter != null) {
			return emfComparisonSourceAdapter.getName();
		}

		Object itemLabelProvider = adapterFactory.adapt(object, IItemLabelProvider.class);
		if (itemLabelProvider instanceof IItemLabelProvider) {
			return ((IItemLabelProvider)itemLabelProvider).getText(object);
		}

		ILabelProvider labelProvider = (ILabelProvider)Platform.getAdapterManager().getAdapter(object,
				ILabelProvider.class);
		if (labelProvider != null) {
			return labelProvider.getText(object);
		}

		IWorkbenchAdapter workbenchAdapter = (IWorkbenchAdapter)Platform.getAdapterManager()
				.getAdapter(object, IWorkbenchAdapter.class);
		if (workbenchAdapter != null) {
			return workbenchAdapter.getLabel(object);
		}

		return object.toString();
	}
}