/*
* $Id$
*
* Copyright (C) 2003-2015 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.service.def;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import org.jnode.driver.Device;
import org.jnode.fs.FSAccessRights;
import org.jnode.fs.FSDirectory;
import org.jnode.fs.FSEntry;
import org.jnode.fs.FSEntryCreated;
import org.jnode.fs.FSEntryLastAccessed;
import org.jnode.fs.FSFile;
import org.jnode.fs.FileSystem;
/**
* Virtual directory entry.
*
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
final class VirtualDirEntry implements FSEntry, FSDirectory, FSEntryCreated, FSEntryLastAccessed {
/**
* The filesystem
*/
private final VirtualFS fs;
/**
* The creation time of this entry.
*/
private long created;
/**
* The last modification time of this entry.
*/
private long lastModified;
/**
* The last access time of this entry.
*/
private long lastAccessed;
/**
* The name of this entry
*/
private final String name;
/**
* My parent
*/
private final FSDirectory parent;
/**
* My entries
*/
private final Map<String, FSEntry> entries;
/**
* Initialize this instance.
*
* @param fs
* @param name
* @param parent
* @throws IOException
*/
VirtualDirEntry(VirtualFS fs, String name, VirtualDirEntry parent) throws IOException {
this.fs = fs;
this.created = this.lastModified = this.lastAccessed = System.currentTimeMillis();
this.name = name;
this.parent = (parent != null) ? parent.getDirectory() : null;
this.entries = new TreeMap<String, FSEntry>();
}
/**
* @see org.jnode.fs.FSEntry#getAccessRights()
*/
public FSAccessRights getAccessRights() throws IOException {
// TODO Auto-generated method stub
return null;
}
/**
* @see org.jnode.fs.FSEntry#getDirectory()
*/
public FSDirectory getDirectory() throws IOException {
return this;
}
/**
* @see org.jnode.fs.FSEntry#getFile()
*/
public FSFile getFile() throws IOException {
throw new IOException("Not a file");
}
public long getCreated() throws IOException {
return created;
}
public long getLastModified() throws IOException {
return lastModified;
}
public long getLastAccessed() throws IOException {
return lastAccessed;
}
@Override
public String getId() {
return getName();
}
/**
* @see org.jnode.fs.FSEntry#getName()
*/
public String getName() {
return name;
}
/**
* @see org.jnode.fs.FSEntry#getParent()
*/
public FSDirectory getParent() {
return parent;
}
/**
* @see org.jnode.fs.FSEntry#isDirectory()
*/
public boolean isDirectory() {
return true;
}
/**
* @see org.jnode.fs.FSEntry#isDirty()
*/
public boolean isDirty() throws IOException {
return false;
}
/**
* @see org.jnode.fs.FSEntry#isFile()
*/
public boolean isFile() {
return false;
}
public void setCreated(long created) throws IOException {
this.created = created;
}
public void setLastModified(long lastModified) throws IOException {
this.lastModified = lastModified;
}
public void setLastAccessed(long lastAccessed) throws IOException {
this.lastAccessed = lastAccessed;
}
/**
* @see org.jnode.fs.FSEntry#setName(java.lang.String)
*/
public void setName(String newName) throws IOException {
throw new IOException("Cannot rename");
}
/**
* @see org.jnode.fs.FSObject#getFileSystem()
*/
public FileSystem<?> getFileSystem() {
return fs;
}
/**
* @see org.jnode.fs.FSObject#isValid()
*/
public boolean isValid() {
return true;
}
/**
* @see org.jnode.fs.FSDirectory#addDirectory(java.lang.String)
*/
public synchronized FSEntry addDirectory(String name) throws IOException {
VirtualFS.log.debug("addDirectory(" + name + ")");
if (entries.containsKey(name)) {
throw new IOException(name + " already exists");
}
final VirtualDirEntry entry = new VirtualDirEntry(fs, name, this);
entries.put(name, entry);
modified();
return entry;
}
/**
* Mount the path within given filesystem to an entry with the given name.
*
* @param name The name of this mounted entry.
* @param fs The filesystem to mount
* @param path The path in the filesystem to use as root.
*/
synchronized VirtualMountEntry addMount(String name, FileSystem<?> fs, String path)
throws IOException {
VirtualFS.log.debug("addMount(" + name + "," + fs + "," + path + ")");
if (entries.containsKey(name)) {
throw new IOException(name + " already exists");
}
final VirtualMountEntry entry = new VirtualMountEntry(fs, path, name, this);
entries.put(name, entry);
modified();
return entry;
}
/**
* @see org.jnode.fs.FSDirectory#addFile(java.lang.String)
*/
public FSEntry addFile(String name) throws IOException {
throw new IOException("Not allowed");
}
/**
* @see org.jnode.fs.FSDirectory#flush()
*/
public void flush() throws IOException {
// Nothing here
}
/**
* @see org.jnode.fs.FSDirectory#getEntry(java.lang.String)
*/
public synchronized FSEntry getEntry(String name) throws IOException {
return entries.get(name);
}
@Override
public FSEntry getEntryById(String id) throws IOException {
return getEntry(id);
}
/**
* @see org.jnode.fs.FSDirectory#iterator()
*/
public synchronized Iterator<FSEntry> iterator() throws IOException {
return new EntryIterator(new ArrayList<FSEntry>(entries.values()));
}
/**
* @see org.jnode.fs.FSDirectory#remove(java.lang.String)
*/
public synchronized void remove(String name) {
entries.remove(name);
modified();
}
/**
* Update the lastmodified flag.
*/
private void modified() {
this.lastModified = System.currentTimeMillis();
}
/**
* The filesystem on the given device will be removed.
*
* @param dev
*/
final synchronized void unregisterFileSystem(Device dev) {
// Make a clone of the entries.values, so we can remove entries
// without a problem.
final Collection<FSEntry> entries = new ArrayList<FSEntry>(this.entries.values());
for (FSEntry entry : entries) {
if (entry instanceof VirtualMountEntry) {
final VirtualMountEntry vme = (VirtualMountEntry) entry;
if (vme.getMountedFS().getDevice() == dev) {
remove(vme.getName());
}
} else if (entry instanceof VirtualDirEntry) {
((VirtualDirEntry) entry).unregisterFileSystem(dev);
}
}
}
/**
* Iterator for entries.
*
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
private static final class EntryIterator implements Iterator<FSEntry> {
private final Iterator<FSEntry> i;
public EntryIterator(Collection<FSEntry> entries) {
this.i = entries.iterator();
}
public boolean hasNext() {
return i.hasNext();
}
public FSEntry next() {
return i.next();
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}