bundles/org.eclipse.core.runtime/src/org/eclipse/core/internal/runtime/PlatformURLFragmentConnection.java

/*******************************************************************************
 * 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.runtime;

/**
 * Platform URL support
 * platform:/fragment/<fragmentId>/		maps to fragmentDescriptor.getInstallURLInternal()
 */

import java.io.IOException;
import java.net.URL;

import org.eclipse.core.internal.boot.PlatformURLConnection;
import org.eclipse.core.internal.boot.PlatformURLHandler;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.model.PluginFragmentModel;
import org.eclipse.core.runtime.model.PluginRegistryModel;
 
public class PlatformURLFragmentConnection extends PlatformURLConnection {

	// fragment/ protocol
	private PluginFragmentModel fd = null;
	private static boolean isRegistered = false;
	public static final String FRAGMENT = "fragment"; //$NON-NLS-1$
public PlatformURLFragmentConnection(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(FRAGMENT)) 
		throw new IOException(Policy.bind("url.badVariant", url.toString())); //$NON-NLS-1$
	int ix = spec.indexOf("/",FRAGMENT.length()+1); //$NON-NLS-1$
	String ref = ix==-1 ? spec.substring(FRAGMENT.length()+1) : spec.substring(FRAGMENT.length()+1,ix);
	String id = getId(ref);
	String vid = getVersion(ref);
	PluginRegistryModel registry = (PluginRegistryModel)Platform.getPluginRegistry();
	fd = vid==null ? registry.getFragment(id) : registry.getFragment(id,vid);
	if (fd == null)
		throw new IOException(Policy.bind("url.resolveFragment", url.toString())); //$NON-NLS-1$
	URL result = new URL (fd.getLocation());
	if (ix == -1 || (ix + 1) >= spec.length()) 
		return result;
	else
		return new URL(result, spec.substring(ix+1));
}

public static void startup() {
	
	// register connection type for platform:/fragment handling
	if (isRegistered) return;
	PlatformURLHandler.register(FRAGMENT, PlatformURLFragmentConnection.class);
	isRegistered = true;
}
}