/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.core.internal.boot;

/**
 * Platform URL support
 * platform:/base/	maps to platform installation location
 */

import java.io.IOException;
import java.net.URL;
 
public class PlatformURLBaseConnection extends PlatformURLConnection {

	// platform/ protocol
	public static final String PLATFORM = "base"; //$NON-NLS-1$
	public static final String PLATFORM_URL_STRING = PlatformURLHandler.PROTOCOL+PlatformURLHandler.PROTOCOL_SEPARATOR+"/"+PLATFORM+"/"; //$NON-NLS-1$ //$NON-NLS-2$
	
	private static URL installURL;
public PlatformURLBaseConnection(URL url) {
	super(url);
}
protected boolean allowCaching() {
	return true;
}
protected URL resolve() throws IOException {
	String spec = url.getFile().trim();
	if (spec.startsWith("/")) //$NON-NLS-1$
		spec = spec.substring(1);
	if (!spec.startsWith(PLATFORM+"/")) { //$NON-NLS-1$
		String message = Policy.bind("url.badVariant", url.toString()); //$NON-NLS-1$
		throw new IOException(message);
	}
	return spec.length()==PLATFORM.length()+1 ? installURL : new URL(installURL,spec.substring(PLATFORM.length()+1)); 
}
public static void startup(URL url) {
	
	// register connection type for platform:/base/ handling
	if (installURL!=null) return;
	installURL = url;
	PlatformURLHandler.register(PLATFORM, PlatformURLBaseConnection.class);
}
}