/*	Copyright (C) 2005 Simon David Rycroft

	This program 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 2
	of the License, or (at your option) any later version.

	This program 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, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */

import java.io.File;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.swing.filechooser.FileFilter;

public class UploaderFileFilter extends FileFilter {

	private Hashtable filters = null;
	private String description = null;
	private String fullDescription = null;
	private boolean useExtensionsInDescription = true;

	public UploaderFileFilter() {
		this.filters = new Hashtable();
	}

	public boolean accept(File f) {
		if(f != null) {
			if(f.isDirectory()) {
				return true;
			}
			String extension = getExtension(f);
			if(extension != null && filters.get(getExtension(f)) != null) {
				return true;
			}
		}
		return false;
	}

	public String getExtension(File f) {
		if(f != null) {
			String filename = f.getName();
			int i = filename.lastIndexOf('.');
			if(i>0 && i<filename.length()-1) {
				return filename.substring(i+1).toLowerCase();
			}
		}
		return null;
	}

	public void addExtension(String extension) {
		if(filters == null) {
			filters = new Hashtable(5);
		}
		filters.put(extension.toLowerCase(), this);
		fullDescription = null;
	}

	public String getDescription() {
		if(fullDescription == null) {
			if(description == null || isExtensionListInDescription()) {
				fullDescription = description==null ? "(" : description + " (";
				// build the description from the extension list
				Enumeration extensions = filters.keys();
				if(extensions != null) {
					fullDescription += "." + (String) extensions.nextElement();
					while (extensions.hasMoreElements()) {
						fullDescription += ", ." + (String) extensions.nextElement();
					}
				}
				fullDescription += ")";
			} else {
				fullDescription = description;
			}
		}
		return fullDescription;
	}

	public void setDescription(String description) {
		this.description = description;
		fullDescription = null;
	}

	public void setExtensionListInDescription(boolean b) {
		useExtensionsInDescription = b;
		fullDescription = null;
	}

	public boolean isExtensionListInDescription() {
		return useExtensionsInDescription;
	}
}