content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * GRAL: GRAphing Library for Java(R)
   *
   * (C) Copyright 2009-2013 Erich Seifert <dev[at]erichseifert.de>,
   * Michael Seifert <mseifert[at]error-reports.org>
   *
   * This file is part of GRAL.
   *
   * GRAL 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 3 of the License, or
   * (at your option) any later version.
   *
   * GRAL 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 GRAL.  If not, see <http://www.gnu.org/licenses/>.
   */
  package de.erichseifert.gral.ui;
  
  import java.io.File;
  import java.text.MessageFormat;
  
  import javax.swing.filechooser.FileFilter;
  
  import de.erichseifert.gral.io.IOCapabilities;
  import de.erichseifert.gral.util.Messages;
  
  /**
   * File filter that extracts files that can be read with a certain set of
   * {@link de.erichseifert.gral.io.IOCapabilities}.
   */
  public class DrawableWriterFilter extends FileFilter {
  	/** Capabilities that describe the data formats that can be processed by
  	this filter. */
  	private final IOCapabilities capabilities;
  
  	/**
  	 * Creates a new instance and initializes it with an
  	 * {@link de.erichseifert.gral.io.IOCapabilities} object.
  	 * @param capabilities writer capabilities.
  	 */
  	public DrawableWriterFilter(IOCapabilities capabilities) {
  		this.capabilities = capabilities;
  	}
  
  	@Override
  	public boolean accept(File f) {
  		if (f == null) {
  			return false;
  		}
  		if (f.isDirectory()) {
  			return true;
  		}
  		String ext = getExtension(f).toLowerCase();
  		for (String extension : capabilities.getExtensions()) {
  			if (extension.equals(ext)) {
  				return true;
  			}
  		}
  		return false;
  	}
  
  	@Override
  	public String getDescription() {
  		return MessageFormat.format(Messages.getString("IO.formatDescription"), //$NON-NLS-1$
  				capabilities.getFormat(), capabilities.getName());
  	}
  
  	/**
  	 * Returns the capabilities filtered by this instance.
  	 * @return writer capabilities.
  	 */
  	public IOCapabilities getWriterCapabilities() {
  		return capabilities;
  	}
  
  	private final static String getExtension(File f) {
  		String name = f.getName();
  		int lastDot = name.lastIndexOf('.');
  		if ((lastDot <= 0) || (lastDot == name.length() - 1)) {
  			return ""; //$NON-NLS-1$
  		}
  		return name.substring(lastDot + 1);
  	}
  }
  