taverna-workbench-renderers-impl/src/main/java/net/sf/taverna/t2/renderers/impl/ExtensionFileFilter.java

/*******************************************************************************
 * Copyright (C) 2007 The University of Manchester   
 * 
 *  Modifications to the initial code base are copyright of their
 *  respective authors, or their employers as appropriate.
 * 
 *  This program 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 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
 *  Lesser General Public License for more details.
 *    
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 ******************************************************************************/
/**
 * This file is a component of the Taverna project,
 * and is licensed under the GNU LGPL.
 * Copyright Tom Oinn, EMBL-EBI
 */
package net.sf.taverna.t2.renderers.impl;

import java.io.File;

import javax.swing.filechooser.FileFilter;

/**
 * A FileFilter implementation that can be configured to show only specific file
 * suffixes.
 * 
 * @author Tom Oinn
 */
public class ExtensionFileFilter extends FileFilter {
	String[] allowedExtensions;

	public ExtensionFileFilter(String[] allowedExtensions) {
		this.allowedExtensions = allowedExtensions;
	}

	@Override
	public boolean accept(File f) {
		if (f.isDirectory())
			return true;
		String extension = getExtension(f);
		if (extension != null)
			for (int i = 0; i < allowedExtensions.length; i++)
				if (extension.equalsIgnoreCase(allowedExtensions[i]))
					return true;
		return false;
	}

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

	@Override
	public String getDescription() {
		StringBuilder sb = new StringBuilder();
		sb.append("Filter for extensions : ");
		String sep = "";
		for (String ext : allowedExtensions) {
			sb.append(sep).append(ext);
			sep = ", ";
		}
		return sb.toString();
	}
}