| /******************************************************************************* |
| * Copyright (c) 2006, 2016 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.help.internal.base.remote; |
| |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| |
| import org.eclipse.core.runtime.ListenerList; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener; |
| import org.eclipse.help.internal.base.HelpBasePlugin; |
| import org.eclipse.help.internal.base.IHelpBaseConstants; |
| |
| /* |
| * Convenience methods for querying the remote help settings. |
| */ |
| public class RemoteHelp { |
| |
| private static final String PROTOCOL_HTTP = "http"; //$NON-NLS-1$ |
| private static final String PROTOCOL_HTTPS = "https"; //$NON-NLS-1$ |
| private static ListenerList<IPreferenceChangeListener> listeners; |
| private static Throwable error; |
| |
| /* |
| * Adds a listener that will be notified whenever the user changes the |
| * remote help server preferences. |
| */ |
| public static void addPreferenceChangeListener(IPreferenceChangeListener listener) { |
| if (listeners == null) { |
| listeners = new ListenerList<>(); |
| } |
| listeners.add(listener); |
| } |
| |
| /* |
| * Removes a listener. |
| */ |
| public static void removePreferenceChangeListener(IPreferenceChangeListener listener) { |
| if (listeners != null) { |
| listeners.remove(listener); |
| } |
| } |
| |
| /* |
| * Signals all registered listeners that remote help preferences have |
| * changed. |
| */ |
| public static void notifyPreferenceChange() { |
| if (listeners != null) { |
| for (IPreferenceChangeListener listener : listeners) |
| listener.preferenceChange(null); |
| } |
| } |
| |
| public static URL getURL(int ic, String pathSuffix) throws MalformedURLException { |
| PreferenceFileHandler handler = new PreferenceFileHandler(); |
| String host = handler.getHostEntries()[ic]; |
| String path = handler.getPathEntries()[ic] + pathSuffix; |
| String protocol = handler.getProtocolEntries()[ic]; |
| int port; |
| URL url =null; |
| try { |
| port = Integer.parseInt(handler.getPortEntries()[ic]); |
| } catch (NumberFormatException e) { |
| throw new MalformedURLException(); |
| } |
| if(protocol.equalsIgnoreCase(PROTOCOL_HTTPS)) |
| url = HttpsUtility.getHttpsURL(protocol,host,port,path); |
| else |
| url = new URL(PROTOCOL_HTTP, host, port, path); |
| |
| return url; |
| } |
| |
| /* |
| * Returns whether or not the help system is currently configured for remote |
| * help content. |
| */ |
| public static boolean isEnabled() { |
| return Platform.getPreferencesService().getBoolean(HelpBasePlugin.PLUGIN_ID, IHelpBaseConstants.P_KEY_REMOTE_HELP_ON, false, null); |
| } |
| |
| /* |
| * Clears the error status for remote help. |
| */ |
| public static void clearError() { |
| error = null; |
| } |
| |
| /* |
| * Returns the error produced during a previous remote help |
| * query, or null if there was none. |
| */ |
| public static Throwable getError() { |
| return error; |
| } |
| |
| /* |
| * Sets the latest exception to have occured while communicating |
| * with the remote help server. |
| */ |
| public static void setError(Throwable t) { |
| error = t; |
| } |
| |
| } |