Java tutorial
/**************************************************************************** * Copyright (C) 2013 HS Coburg. * All rights reserved. * Contact: ecsec GmbH (info@ecsec.de) * * This file is part of the Open eCard App. * * GNU General Public License Usage * This file may be used under the terms of the GNU General Public * License version 3.0 as published by the Free Software Foundation * and appearing in the file LICENSE.GPL included in the packaging of * this file. Please review the following information to ensure the * GNU General Public License version 3.0 requirements will be met: * http://www.gnu.org/copyleft/gpl.html. * * Other Usage * Alternatively, this file may be used in accordance with the terms * and conditions contained in a signed written agreement between * you and ecsec GmbH. * ***************************************************************************/ package org.openecard.addon; import java.io.File; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLClassLoader; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.Map.Entry; import java.util.Set; import org.apache.commons.jci.monitor.FilesystemAlterationMonitor; import org.openecard.addon.manifest.AddonSpecification; import org.openecard.addon.manifest.AppExtensionSpecification; import org.openecard.addon.manifest.AppPluginSpecification; import org.openecard.addon.manifest.LocalizedString; import org.openecard.addon.manifest.ProtocolPluginSpecification; import org.openecard.common.util.FileUtils; import org.openecard.ws.marshal.WSMarshallerException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * This registry provides access to all addons in the plugins directory. * Adding and removing addon-files at runtime is supported. * * @author Dirk Petrautzki <petrautzki@hs-coburg.de> */ public class FileRegistry implements AddonRegistry { private static final Logger logger = LoggerFactory.getLogger(FileRegistry.class.getName()); private static final ArrayList<AddonSpecification> registeredAddons = new ArrayList<AddonSpecification>(); private static final HashMap<String, File> files = new HashMap<String, File>(); public FileRegistry() throws WSMarshallerException { String addonPath; try { addonPath = FileUtils.getHomeConfigDir() + File.separator + "addons" + File.separator; } catch (SecurityException e) { logger.error("Failed to get add-on directory; FileRegistry won't work.", e); return; } catch (IOException e) { logger.error("Failed to get add-on directory; FileRegistry won't work.", e); return; } startFileMonitor(addonPath); } private void startFileMonitor(String addonPath) throws WSMarshallerException { File f = new File(addonPath); logger.debug("Starting file alteration monitor on path: {}", f.getPath()); FilesystemAlterationMonitor fam = new FilesystemAlterationMonitor(); fam.addListener(f, new PluginDirectoryAlterationListener(this)); fam.start(); } public void register(AddonSpecification desc, File file) { registeredAddons.add(desc); files.put(desc.getId(), file); } public void unregister(File file) { Set<Entry<String, File>> entrySet = files.entrySet(); Iterator<Entry<String, File>> iterator = entrySet.iterator(); while (iterator.hasNext()) { Entry<String, File> next = iterator.next(); if (next.getValue().equals(file)) { String id = next.getKey(); AddonSpecification desc = this.search(id); registeredAddons.remove(desc); files.remove(id); logger.debug("Successfully removed addon {}", file.getName()); break; } } } @Override public Set<AddonSpecification> listAddons() { Set<AddonSpecification> list = new HashSet<AddonSpecification>(); list.addAll(registeredAddons); return list; } @Override public AddonSpecification search(String id) { for (AddonSpecification desc : registeredAddons) { if (desc.getId().equals(id)) { return desc; } } return null; } @Override public Set<AddonSpecification> searchByName(String name) { Set<AddonSpecification> matchingAddons = new HashSet<AddonSpecification>(); for (AddonSpecification desc : registeredAddons) { for (LocalizedString s : desc.getLocalizedName()) { if (s.getValue().equals(name)) { matchingAddons.add(desc); } } } return matchingAddons; } @Override public Set<AddonSpecification> searchIFDProtocol(String uri) { Set<AddonSpecification> matchingAddons = new HashSet<AddonSpecification>(); for (AddonSpecification desc : registeredAddons) { ProtocolPluginSpecification protocolDesc = desc.searchIFDActionByURI(uri); if (protocolDesc != null) { matchingAddons.add(desc); } } return matchingAddons; } @Override public Set<AddonSpecification> searchSALProtocol(String uri) { Set<AddonSpecification> matchingAddons = new HashSet<AddonSpecification>(); for (AddonSpecification desc : registeredAddons) { ProtocolPluginSpecification protocolDesc = desc.searchSALActionByURI(uri); if (protocolDesc != null) { matchingAddons.add(desc); } } return matchingAddons; } @Override public ClassLoader downloadAddon(AddonSpecification addonSpec) { String aId = addonSpec.getId(); // TODO use other own classloader impl with security features URL[] url = new URL[1]; try { url[0] = files.get(aId).toURI().toURL(); } catch (MalformedURLException e) { // TODO will this ever happen? logger.error(e.getMessage(), e); } URLClassLoader ucl = new URLClassLoader(url); return ucl; } @Override public Set<AddonSpecification> searchByResourceName(String resourceName) { Set<AddonSpecification> matchingAddons = new HashSet<AddonSpecification>(); for (AddonSpecification desc : registeredAddons) { AppPluginSpecification actionDesc = desc.searchByResourceName(resourceName); if (actionDesc != null) { matchingAddons.add(desc); } } return matchingAddons; } @Override public Set<AddonSpecification> searchByActionId(String actionId) { Set<AddonSpecification> matchingAddons = new HashSet<AddonSpecification>(); for (AddonSpecification desc : registeredAddons) { AppExtensionSpecification actionDesc = desc.searchByActionId(actionId); if (actionDesc != null) { matchingAddons.add(desc); } } return matchingAddons; } }