/*******************************************************************************
 * Copyright (c) 2006, 2015 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
 ******************************************************************************/

package org.eclipse.ui.internal.navigator.extensions;

import org.eclipse.core.runtime.Assert;
import org.eclipse.ui.navigator.ICommonActionExtensionSite;
import org.eclipse.ui.navigator.ICommonContentExtensionSite;
import org.eclipse.ui.navigator.IExtensionStateModel;
import org.eclipse.ui.navigator.INavigatorContentService;

/**
 *
 * Provides a common base class for {@link ICommonContentExtensionSite} and
 * {@link ICommonActionExtensionSite}.
 *
 * @since 3.2
 *
 */
public class CommonExtensionSite {

	private final INavigatorContentService contentService;

	private IExtensionStateModel extensionStateModel;

	protected CommonExtensionSite(INavigatorContentService aContentService,
			String anExtensionId) {

		Assert.isNotNull(aContentService);

		contentService = aContentService;
		if (anExtensionId != null) {
			extensionStateModel = aContentService.findStateModel(anExtensionId);
		}
	}

	/**
	 *
	 * @return The content service used to create this extension site
	 */
	public final INavigatorContentService getContentService() {
		return contentService;
	}

	/**
	 * By default, the extension state model returned is for the associated
	 * content extension (if this is NOT a top-level action provider).
	 * Otherwise, clients may use
	 * {@link INavigatorContentService#findStateModel(String)} to locate the
	 * state model of another content extension.
	 *
	 * @return The extension state model of the associated extension.
	 * @see IExtensionStateModel
	 */
	public final IExtensionStateModel getExtensionStateModel() {
		return extensionStateModel;
	}

}