| /******************************************************************************* |
| * Copyright (c) 2007, 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 |
| * compeople AG (Stefan Liebig) - Fix for bug 121201 - Poor performance behind proxy/firewall |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.core.helpers; |
| |
| import java.io.File; |
| import java.net.URI; |
| import java.net.URL; |
| |
| /** |
| * A utility class for manipulating URLs. This class works around some of the |
| * broken behavior of the java.net.URL class. |
| */ |
| public class URLUtil { |
| |
| /** |
| * Returns the URL as a local file, or <code>null</code> if the given |
| * URL does not represent a local file. |
| * @param url The url to return the file for |
| * @return The local file corresponding to the given url, or <code>null</code> |
| */ |
| public static File toFile(URL url) { |
| |
| if (!"file".equalsIgnoreCase(url.getProtocol())) //$NON-NLS-1$ |
| return null; |
| //assume all illegal characters have been properly encoded, so use URI class to unencode |
| |
| String externalForm = url.toExternalForm(); |
| String pathString = externalForm.substring(5); |
| |
| try { |
| if (pathString.indexOf('/') == 0) { |
| if (pathString.indexOf("//") == 0) //$NON-NLS-1$ |
| externalForm = "file:" + ensureUNCPath(pathString); //$NON-NLS-1$ |
| return new File(new URI(externalForm)); |
| } |
| if (pathString.indexOf(':') == 1) |
| return new File(new URI("file:/" + pathString)); //$NON-NLS-1$ |
| |
| return new File(new URI(pathString).getSchemeSpecificPart()); |
| } catch (Exception e) { |
| //URL contains unencoded characters |
| return new File(pathString); |
| } |
| } |
| |
| /** |
| * Ensures the given path string starts with exactly four leading slashes. |
| */ |
| private static String ensureUNCPath(String path) { |
| int len = path.length(); |
| StringBuffer result = new StringBuffer(len); |
| for (int i = 0; i < 4; i++) { |
| // if we have hit the first non-slash character, add another leading slash |
| if (i >= len || result.length() > 0 || path.charAt(i) != '/') |
| result.append('/'); |
| } |
| result.append(path); |
| return result.toString(); |
| } |
| } |