/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.jifs.def;
import java.io.IOException;
import javax.naming.NameNotFoundException;
import org.apache.log4j.Logger;
import org.jnode.driver.DeviceManager;
import org.jnode.driver.DeviceNotFoundException;
import org.jnode.driver.DeviceUtils;
import org.jnode.driver.virtual.VirtualDevice;
import org.jnode.fs.FSEntry;
import org.jnode.fs.jifs.ExtFSEntry;
import org.jnode.fs.jifs.JIFSDirectory;
import org.jnode.fs.jifs.JIFileSystemType;
import org.jnode.fs.service.FileSystemService;
import org.jnode.naming.InitialNaming;
import org.jnode.plugin.ConfigurationElement;
import org.jnode.plugin.Extension;
import org.jnode.plugin.ExtensionPoint;
import org.jnode.plugin.ExtensionPointListener;
/**
* @author Andreas H\u00e4nel
*/
final class JIFSExtension implements ExtensionPointListener {
/** My logger */
private static final Logger log = Logger.getLogger(JIFSExtension.class);
/** The org.jnode.fs.jifs.def.info extension point */
private final ExtensionPoint infoEP;
private JIFSDirectory extdir;
protected JIFSExtension(ExtensionPoint infoEP) {
if (infoEP == null) {
throw new IllegalArgumentException("The info extension-point cannot be null.");
}
this.infoEP = infoEP;
try {
FileSystemService fSS = InitialNaming.lookup(FileSystemService.NAME);
final DeviceManager dm = DeviceUtils.getDeviceManager();
VirtualDevice dev = (VirtualDevice) dm.getDevice(JIFileSystemType.VIRTUAL_DEVICE_NAME);
JIFSDirectory rootdir = (JIFSDirectory) fSS.getFileSystem(dev).getRootEntry();
extdir = (JIFSDirectory) rootdir.getEntry("extended").getDirectory();
} catch (NameNotFoundException e) {
log.error("filesystemservice / filesystemtype not found");
} catch (DeviceNotFoundException ex) {
log.info("no jifs present");
} catch (IOException ex) {
log.error(ex);
}
refresh();
}
/**
* An extension has been added to an extension point
*
* @param point
* @param extension
*/
public void extensionAdded(ExtensionPoint point, Extension extension) {
refresh();
}
/**
* An extension has been removed from an extension point
*
* @param point
* @param extension
*/
public void extensionRemoved(ExtensionPoint point, Extension extension) {
refresh();
}
private void refresh() {
if (extdir == null) {
return;
}
extdir.refresh();
final Extension[] extensions = infoEP.getExtensions();
for (int i = 0; i < extensions.length; i++) {
final Extension ext = extensions[i];
final ConfigurationElement[] elements = ext.getConfigurationElements();
for (int j = 0; j < elements.length; j++) {
addEntry(elements[j]);
}
}
}
private void addEntry(ConfigurationElement element) {
final String className = element.getAttribute("class");
final String entryName = element.getAttribute("name");
if (className != null) {
try {
final ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
ExtFSEntry entry = (ExtFSEntry) o;
if (entry.getName() == null) {
if (entryName != null) {
entry.setName(entryName);
} else {
entry.setName(className);
}
}
entry.setParent(extdir);
FSEntry add = entry;
extdir.addFSE(add);
} catch (ClassCastException ex) {
log.error("Given class " + className + " does not implement .");
} catch (ClassNotFoundException ex) {
log.error("Cannot load " + className);
} catch (IllegalAccessException ex) {
log.error("No access to " + className);
} catch (InstantiationException ex) {
log.error(ex);
} catch (IOException ex) {
log.error("could not set name of file: " + entryName);
}
}
}
}