/*******************************************************************************
 * 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
 ******************************************************************************/
package net.sf.taverna.t2.workbench.ui.credentialmanager;

import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;

/**
 * File filter for filtering against various file extensions.
 * 
 * @author Alexandra Nenadic
 */
public class CryptoFileFilter extends javax.swing.filechooser.FileFilter 
{
	/** Description of the filter */
	private String description;
	
	/** Array of file extensions to filter against */
	private ArrayList<String> exts = new ArrayList<String>();
	
    /**
     * Construct a CryptoFileFilter for a set of related file extensions.
     *
     * @param extList Array of file extensions
     * @param sDescription Short collective description for the file extensions
     */
    public CryptoFileFilter(String [] extList, String sDescription)
    {
        for (int i = 0; i < extList.length; i++) {
            addType (extList[i]);
        }
        description = sDescription;
    }

	private void addType(String s) {
		exts.add(s);
	}

	/** Return true if the given file is accepted by this filter. */
	public boolean accept(File f) 
	{
		// Little trick: if you don't do this, only directory names
		// ending in one of the extentions appear in the window.
		if (f.isDirectory()) 
	    {
	    	return true;
	    } 
	    else if (f.isFile()) 
	    {
	    	Iterator<String> it = exts.iterator();
	    	while (it.hasNext()) {
	        if (f.getName().toLowerCase().endsWith((String) it.next()))
	        	return true;
	    	}
	    }
	    // A file that didn't match.
	    return false;
	  }

	  /** Set the printable description of this filter. */
	  public void setDescription(String s) {
	    description = s;
	  }

	  /** Return the printable description of this filter. */
	  public String getDescription() {
	    return description;
	  }
	}