/*
* This file is part of muCommander, http://www.mucommander.com
* Copyright (C) 2002-2016 Maxence Bernard
*
* muCommander is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* muCommander 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.mucommander.ui.main.tree;
import com.mucommander.commons.file.AbstractFile;
import com.mucommander.commons.file.filter.FileFilter;
import com.mucommander.commons.file.util.FileComparator;
import javax.swing.event.EventListenerList;
import java.util.HashMap;
import java.util.Map;
/**
* This class holds cached directories.
* It maps AbstractFiles to DirectoryCache instances.
* @author Mariusz Jakubowski
*
*/
public class DirectoryCache {
/** a map that holds cached folders */
private Map<AbstractFile, CachedDirectory> cache;
/** Comparator used to sort folders */
private FileComparator sort;
/** A file filter */
private FileFilter filter;
/** Listeners. */
protected EventListenerList listenerList = new EventListenerList();
/**
* Creates a new directory cache.
* @param filter filter used to filter children directories.
* @param sort a comparator used to sort children
*/
public DirectoryCache(FileFilter filter, FileComparator sort) {
//this.cache = Collections.synchronizedMap(new HashMap());
this.cache = new HashMap<AbstractFile, CachedDirectory>();
this.filter = filter;
this.sort = sort;
}
/**
* Returns current sort order.
*/
public FileComparator getSort() {
return sort;
}
/**
* Returns current filter.
*/
public FileFilter getFilter() {
return filter;
}
/**
* Fires a cachingStarted or cachingEnded event on all listeners.
* @param cachedDirectory a directory those children has been cached
* @param readingChildren
*/
public void fireChildrenCached(CachedDirectory cachedDirectory, boolean readingChildren) {
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2) {
if (listeners[i] == CachedDirectoryListener.class) {
if (readingChildren) {
((CachedDirectoryListener) listeners[i + 1]).cachingStarted(cachedDirectory);
} else {
((CachedDirectoryListener) listeners[i + 1]).cachingEnded(cachedDirectory);
}
}
}
}
public void addCachedDirectoryListener(CachedDirectoryListener l) {
listenerList.add(CachedDirectoryListener.class, l);
}
public void removeCachedDirectoryListener(CachedDirectoryListener l) {
listenerList.remove(CachedDirectoryListener.class, l);
}
public synchronized void clear() {
cache.clear();
}
public synchronized CachedDirectory get(AbstractFile key) {
return cache.get(key);
}
public synchronized void put(AbstractFile key, CachedDirectory value) {
cache.put(key, value);
}
/**
* Deletes entry and all children from the cache.
*/
public synchronized void removeWithChildren(AbstractFile key) {
CachedDirectory cachedDir = cache.get(key);
if (cachedDir != null) {
cache.remove(key);
AbstractFile[] children = cachedDir.get();
if (children != null) {
for (AbstractFile child : children) {
removeWithChildren(child);
}
}
}
}
/**
* Gets a cached instance of a file. If the cached instance
* of the file doesn't exists it's added to the cache.
* @param key an AbstractFile instance
* @return a cached file instance
*/
public synchronized CachedDirectory getOrAdd(AbstractFile key) {
CachedDirectory cachedDir = cache.get(key);
if (cachedDir == null) {
cachedDir = new CachedDirectory(key, this);
cache.put(key, cachedDir);
}
return cachedDir;
}
}