/*******************************************************************************
 * Copyright (c) 2000, 2007 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.update.core;

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

import org.eclipse.update.internal.core.Messages;
import org.eclipse.update.internal.core.UpdateCore;

/**
 * Convenience implementation of a feature reference.
 * <p>
 * This class may be instantiated or subclassed by clients.
 * </p> 
 * <p>
 * <b>Note:</b> This class/interface is part of an interim API that is still under development and expected to
 * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
 * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
 * (repeatedly) as the API evolves.
 * </p>
 * @see org.eclipse.update.core.IFeatureReference
 * @see org.eclipse.update.core.model.FeatureReferenceModel
 * @see org.eclipse.update.core.ISiteFeatureReference
 * @see org.eclipse.update.core.SiteFeatureReferenceModel 
 * @since 2.1
 */
public class SiteFeatureReference extends SiteFeatureReferenceModel implements ISiteFeatureReference {

	private List categories;

	/**
	 * Feature reference default constructor
	 */
	public SiteFeatureReference() {
		super();
	}

	/**
	 * Constructor FeatureReference.
	 * @param ref the reference to copy
	 */
	public SiteFeatureReference(ISiteFeatureReference ref) {
		super(ref);
	}

	/**
	 * Returns an array of categories the referenced feature belong to.
	 * 
	 * @see ISiteFeatureReference#getCategories()
	 * @since 2.1 
	 */
	public ICategory[] getCategories() {

		if (categories == null) {
			categories = new ArrayList();
			String[] categoriesAsString = getCategoryNames();
			for (int i = 0; i < categoriesAsString.length; i++) {
				ICategory siteCat = getSite().getCategory(categoriesAsString[i]);
				if (siteCat != null)
					categories.add(siteCat);
				else {
					String siteURL = getSite().getURL() != null ? getSite().getURL().toExternalForm() : null;
					UpdateCore.warn("Category " + categoriesAsString[i] + " not found in Site:" + siteURL); //$NON-NLS-1$ //$NON-NLS-2$
				}
			}
		}

		if (categories.size() == 0) {
			//there was no category defined
			//so we add the default "Other" category
			ICategory category = new Category(Messages.SiteCategory_other_label, Messages.SiteCategory_other_description);
			categories.add(category);
		}
		
		ICategory[] result = new ICategory[0];

		if (!(categories == null || categories.isEmpty())) {
			result = new ICategory[categories.size()];
			categories.toArray(result);
		}
		return result;
	}

	/**
	 * Adds a category to the referenced feature.
	 * 
	 * @see ISiteFeatureReference#addCategory(ICategory)
	 * @since 2.1 
	 */
	public void addCategory(ICategory category) {
		this.addCategoryName(category.getName());
	}

}