/*******************************************************************************
 *  Copyright (c) 2000, 2009 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.net.*;

import org.eclipse.core.runtime.*;
import org.eclipse.osgi.util.NLS;
import org.eclipse.update.internal.core.Messages;
import org.eclipse.update.internal.core.UpdateCore;

/**
 * Base site content provider
 * <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>
 * @deprecated The org.eclipse.update component has been replaced by Equinox p2. This
 * provisional API was never promoted to stable API, and may be removed from a future release of the platform.
 */
public abstract class SiteContentProvider implements ISiteContentProvider {

	private URL base;
	private ISite site;

	/**
	 * Constructor for SiteContentProvider
	 */
	public SiteContentProvider(URL url) {
		super();
		this.base = url;
	}

	/**
	 * Returns the URL of this site
	 * 
	 * @see ISiteContentProvider#getURL()
	 * @since 2.0
	 */
	public URL getURL() {
		return base;
	}

	/**
	 * Returns a URL for the identified archive
	 * 
	 * @see ISiteContentProvider#getArchiveReference(String)
	 * @since 2.0
	 */
	private URL getArchiveReference1(String archiveID) throws CoreException {
		try {
			return new URL(getURL(), archiveID);
		} catch (MalformedURLException e) {
			throw Utilities.newCoreException(
					NLS.bind(Messages.SiteContentProvider_ErrorCreatingURLForArchiveID, (new String[] { archiveID, getURL().toExternalForm() })),
					e);
		}
	}

	/**
	 * Returns the site for this provider
	 * 
	 * @see ISiteContentProvider#getSite()
	 * @since 2.0
	 */
	public ISite getSite() {
		return site;
	}

	/**
	 * Sets the site for this provider
	 * 
	 * @param site site for this provider
	 * @since 2.0
	 */
	public void setSite(ISite site) {
		this.site = site;
	}

	public URL getArchiveReference(String archiveId) throws CoreException {
		URL contentURL = null;
		
		contentURL = getArchiveURLfor(archiveId);
		// if there is no mapping in the site.xml
		// for this archiveId, use the default one
		if (contentURL==null) {
			return getArchiveReference1(archiveId);
		}
		
		return contentURL;
	}

	/**
	 * return the URL associated with the id of teh archive for this site
	 * return null if the archiveId is null, empty or 
	 * if teh list of archives on the site is null or empty
	 * of if there is no URL associated with the archiveID for this site
	 */
	private URL getArchiveURLfor(String archiveId) {
		URL result = null;
		boolean found = false;
	
		IArchiveReference[] siteArchives = getSite().getArchives();
		if (siteArchives.length > 0) {
			for (int i = 0; i < siteArchives.length && !found; i++) {
				if (UpdateCore.DEBUG && UpdateCore.DEBUG_SHOW_INSTALL)
					UpdateCore.debug("GetArchiveURL for:"+archiveId+" compare to "+siteArchives[i].getPath()); //$NON-NLS-1$ //$NON-NLS-2$
				if (archiveId.trim().equalsIgnoreCase(siteArchives[i].getPath())) {
					result = siteArchives[i].getURL();
					found = true;
					break;
				}
			}
		}
		return result;
	}
}