| /******************************************************************************* |
| * Copyright (c) 2009, 2010 Tasktop Technologies 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: |
| * Tasktop Technologies - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.mylyn.internal.discovery.core.util; |
| |
| import java.io.BufferedOutputStream; |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.io.Reader; |
| import java.net.URI; |
| import java.util.List; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.mylyn.commons.net.AbstractWebLocation; |
| |
| /** |
| * A utility for accessing web resources |
| * |
| * @author David Green |
| */ |
| public class WebUtil { |
| /** |
| * implementors are capable of processing character content |
| * |
| * @see WebUtil#readResource(AbstractWebLocation, TextContentProcessor, IProgressMonitor) |
| */ |
| public interface TextContentProcessor { |
| public void process(Reader reader) throws IOException; |
| } |
| |
| private static ITransportService transport; |
| |
| /** |
| * Download an HTTP-based resource |
| * |
| * @param target |
| * the target file to which the content is saved |
| * @param location |
| * the web location of the content |
| * @param monitor |
| * the monitor |
| * @return |
| * @throws IOException |
| * if a network or IO problem occurs |
| */ |
| public static IStatus download(URI uri, File target, IProgressMonitor monitor) throws IOException { |
| IStatus result; |
| OutputStream out = new BufferedOutputStream(new FileOutputStream(target)); |
| try { |
| result = download(uri, out, monitor); |
| } finally { |
| out.close(); |
| } |
| if (!result.isOK()) { |
| target.delete(); |
| if (result.getException() instanceof IOException) { |
| throw (IOException) result.getException(); |
| } |
| throw new IOWithCauseException(result.getException()); |
| } |
| return result; |
| } |
| |
| /** |
| * Read a web-based resource at the specified location using the given processor. |
| * |
| * @param location |
| * the web location of the content |
| * @param processor |
| * the processor that will handle content |
| * @param monitor |
| * the monitor |
| * @throws IOException |
| * if a network or IO problem occurs |
| * @throws CoreException |
| */ |
| public static void readResource(URI uri, TextContentProcessor processor, IProgressMonitor monitor) |
| throws IOException, CoreException { |
| InputStream in = stream(uri, monitor); |
| try { |
| // FIXME how can the charset be determined? |
| BufferedReader reader = new BufferedReader(new InputStreamReader(in, "UTF-8")); //$NON-NLS-1$ |
| processor.process(reader); |
| } finally { |
| in.close(); |
| } |
| } |
| |
| /** |
| * Verify availability of resources at the given web locations. Normally this would be done using an HTTP HEAD. |
| * |
| * @param locations |
| * the locations of the resource to verify |
| * @param one |
| * indicate if only one of the resources must exist |
| * @param monitor |
| * the monitor |
| * @return true if the resource exists |
| * @throws CoreException |
| */ |
| public static boolean verifyAvailability(List<? extends URI> locations, boolean one, IProgressMonitor monitor) |
| throws IOException, CoreException { |
| if (locations.isEmpty() || locations.size() > 5) { |
| throw new IllegalArgumentException(); |
| } |
| int countFound = 0; |
| for (URI location : locations) { |
| try { |
| getLastModified(location, monitor); |
| if (one) { |
| return true; |
| } |
| ++countFound; |
| } catch (FileNotFoundException e) { |
| if (!one) { |
| return false; |
| } |
| continue; |
| } |
| } |
| return countFound == locations.size(); |
| } |
| |
| public static synchronized ITransportService getTransport() { |
| if (transport == null) { |
| if (Platform.isRunning()) { |
| try { |
| transport = new P2TransportService(); |
| } catch (ClassNotFoundException e) { |
| // fall back to HttpClientTransport |
| } |
| } |
| if (transport == null) { |
| transport = new HttpClientTransportService(); |
| } |
| } |
| return transport; |
| } |
| |
| public static IStatus download(URI uri, OutputStream out, IProgressMonitor monitor) { |
| return getTransport().download(uri, out, monitor); |
| } |
| |
| public static InputStream stream(URI uri, IProgressMonitor monitor) throws IOException, CoreException { |
| return getTransport().stream(uri, monitor); |
| } |
| |
| private static long getLastModified(URI location, IProgressMonitor monitor) throws CoreException, IOException { |
| return getTransport().getLastModified(location, monitor); |
| } |
| |
| public static String getFileNameFor(String bundleUrl) throws IOException { |
| if (bundleUrl.charAt(bundleUrl.length() - 1) == '/') { |
| bundleUrl = bundleUrl.substring(0, bundleUrl.length() - 1); |
| } |
| if (bundleUrl.lastIndexOf('/') != -1) { |
| bundleUrl = bundleUrl.substring(bundleUrl.lastIndexOf('/') + 1); |
| } |
| return bundleUrl.replaceAll("[^a-zA-Z0-9_\\.]", "_"); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| |
| } |