plugins/org.eclipse.emf.compare.edit/src/org/eclipse/emf/compare/provider/ExtendedAdapterFactoryItemDelegator.java

/*******************************************************************************
 * Copyright (c) 2013, 2015 Obeo.
 * 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.compare.provider;

import static com.google.common.collect.Iterables.isEmpty;

import java.util.List;

import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.compare.provider.utils.ComposedStyledString;
import org.eclipse.emf.compare.provider.utils.IStyledString;
import org.eclipse.emf.compare.provider.utils.IStyledString.IComposedStyledString;
import org.eclipse.emf.edit.provider.AdapterFactoryItemDelegator;

/**
 * An item provider adapter factory delegator that supports our custom item provider interfaces:
 * {@link IItemStyledLabelProvider}, {@link IItemDescriptionProvider} and {@link ISemanticObjectLabelProvider}
 * .
 * 
 * @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
 * @since 4.0
 */
public class ExtendedAdapterFactoryItemDelegator extends AdapterFactoryItemDelegator implements IItemStyledLabelProvider, IItemDescriptionProvider, ISemanticObjectLabelProvider {

	/**
	 * Creates a new instance that will use the given adapter factory to respond to its implemented protocol.
	 * 
	 * @param adapterFactory
	 *            the adapter factory use to adapt.
	 */
	public ExtendedAdapterFactoryItemDelegator(AdapterFactory adapterFactory) {
		super(adapterFactory);
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.emf.compare.provider.IItemDescriptionProvider#getDescription(java.lang.Object)
	 */
	public String getDescription(Object object) {
		return getText(object);
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.emf.compare.provider.IItemStyledLabelProvider#getStyledText(java.lang.Object)
	 */
	public IComposedStyledString getStyledText(Object object) {
		final IComposedStyledString result;
		if (object instanceof EList<?>) {
			result = new ComposedStyledString();
			for (Object child : (List<?>)object) {
				if (!isEmpty(result)) {
					result.append(", "); //$NON-NLS-1$
				}
				IComposedStyledString styledText = getStyledText(child);
				for (IStyledString styledString : styledText) {
					result.append(styledString.getString(), styledString.getStyle());
				}
			}
		} else {
			IItemStyledLabelProvider itemStyledLabelProvider = (IItemStyledLabelProvider)adapterFactory
					.adapt(object, IItemStyledLabelProvider.class);

			if (itemStyledLabelProvider != null) {
				result = itemStyledLabelProvider.getStyledText(object);
			} else if (object == null) {
				result = new ComposedStyledString();
			} else {
				result = new ComposedStyledString(getText(object));
			}
		}
		return result;
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.emf.compare.provider.ISemanticObjectLabelProvider#getSemanticObjectLabel(java.lang.Object)
	 * @since 4.2
	 */
	public String getSemanticObjectLabel(Object object) {
		ISemanticObjectLabelProvider itemLabelProvider = (ISemanticObjectLabelProvider)adapterFactory
				.adapt(object, ISemanticObjectLabelProvider.class);
		String result;
		if (itemLabelProvider != null) {
			result = itemLabelProvider.getSemanticObjectLabel(object);
		} else if (object == null) {
			result = ""; //$NON-NLS-1$
		} else {
			result = getText(object);
		}
		return result;
	}
}