/* * @(#)ExampleFileFilter.java	1.16 04/07/26 *  * Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved. *  * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: *  * -Redistribution of source code must retain the above copyright notice, this *  list of conditions and the following disclaimer. *  * -Redistribution in binary form must reproduce the above copyright notice,  *  this list of conditions and the following disclaimer in the documentation *  and/or other materials provided with the distribution. *  * Neither the name of Sun Microsystems, Inc. or the names of contributors may  * be used to endorse or promote products derived from this software without  * specific prior written permission. *  * This software is provided "AS IS," without a warranty of any kind. ALL  * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST  * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,  * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY  * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. *  * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. *//* * @(#)ExampleFileFilter.java	1.16 04/07/26 */package cqj.jar.com; import java.io.File;import java.util.Hashtable;import java.util.Enumeration;import javax.swing.*;import javax.swing.filechooser.*;/** * A convenience implementation of FileFilter that filters out * all files except for those type extensions that it knows about. * * Extensions are of the type ".foo", which is typically found on * Windows and Unix boxes, but not on Macinthosh. Case is ignored. * * Example - create a new filter that filerts out all files * but gif and jpg image files: * *     JFileChooser chooser = new JFileChooser(); *     ExampleFileFilter filter = new ExampleFileFilter( *                   new String{"gif", "jpg"}, "JPEG & GIF Images") *     chooser.addChoosableFileFilter(filter); *     chooser.showOpenDialog(this); * * @version 1.16 07/26/04 * @author Jeff Dinkins */public class ExampleFileFilter extends FileFilter {    private static String TYPE_UNKNOWN = "Type Unknown";    private static String HIDDEN_FILE = "Hidden File";    private Hashtable filters = null;    private String description = null;    private String fullDescription = null;    private boolean useExtensionsInDescription = true;    /**     * Creates a file filter. If no filters are added, then all     * files are accepted.     *     * @see #addExtension     */    public ExampleFileFilter() {	this.filters = new Hashtable();    }    /**     * Creates a file filter that accepts files with the given extension.     * Example: new ExampleFileFilter("jpg");     *     * @see #addExtension     */    public ExampleFileFilter(String extension) {	this(extension,null);    }    /**     * Creates a file filter that accepts the given file type.     * Example: new ExampleFileFilter("jpg", "JPEG Image Images");     *     * Note that the "." before the extension is not needed. If     * provided, it will be ignored.     *     * @see #addExtension     */    public ExampleFileFilter(String extension, String description) {	this();	if(extension!=null) addExtension(extension); 	if(description!=null) setDescription(description);    }    /**     * Creates a file filter from the given string array.     * Example: new ExampleFileFilter(String {"gif", "jpg"});     *     * Note that the "." before the extension is not needed adn     * will be ignored.     *     * @see #addExtension     */    public ExampleFileFilter(String[] filters) {	this(filters, null);    }    /**     * Creates a file filter from the given string array and description.     * Example: new ExampleFileFilter(String {"gif", "jpg"}, "Gif and JPG Images");     *     * Note that the "." before the extension is not needed and will be ignored.     *     * @see #addExtension     */    public ExampleFileFilter(String[] filters, String description) {	this();	for (int i = 0; i < filters.length; i++) {	    // add filters one by one	    addExtension(filters[i]);	} 	if(description!=null) setDescription(description);    }    /**     * Return true if this file should be shown in the directory pane,     * false if it shouldn't.     *     * Files that begin with "." are ignored.     *     * @see #getExtension     * @see FileFilter#accepts     */    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;    }    /**     * Return the extension portion of the file's name .     *     * @see #getExtension     * @see FileFilter#accept     */     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;    }    /**     * Adds a filetype "dot" extension to filter against.     *     * For example: the following code will create a filter that filters     * out all files except those that end in ".jpg" and ".tif":     *     *   ExampleFileFilter filter = new ExampleFileFilter();     *   filter.addExtension("jpg");     *   filter.addExtension("tif");     *     * Note that the "." before the extension is not needed and will be ignored.     */    public void addExtension(String extension) {	if(filters == null) {	    filters = new Hashtable(5);	}	filters.put(extension.toLowerCase(), this);	fullDescription = null;    }    /**     * Returns the human readable description of this filter. For     * example: "JPEG and GIF Image Files (*.jpg, *.gif)"     *     * @see setDescription     * @see setExtensionListInDescription     * @see isExtensionListInDescription     * @see FileFilter#getDescription     */    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;    }    /**     * Sets the human readable description of this filter. For     * example: filter.setDescription("Gif and JPG Images");     *     * @see setDescription     * @see setExtensionListInDescription     * @see isExtensionListInDescription     */    public void setDescription(String description) {	this.description = description;	fullDescription = null;    }    /**     * Determines whether the extension list (.jpg, .gif, etc) should     * show up in the human readable description.     *     * Only relevent if a description was provided in the constructor     * or using setDescription();     *     * @see getDescription     * @see setDescription     * @see isExtensionListInDescription     */    public void setExtensionListInDescription(boolean b) {	useExtensionsInDescription = b;	fullDescription = null;    }    /**     * Returns whether the extension list (.jpg, .gif, etc) should     * show up in the human readable description.     *     * Only relevent if a description was provided in the constructor     * or using setDescription();     *     * @see getDescription     * @see setDescription     * @see setExtensionListInDescription     */    public boolean isExtensionListInDescription() {	return useExtensionsInDescription;    }}