ExampleFileFilter.java

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/*
 * @(#)ExampleFileFilter.java   1.9 99/04/23
 *
 * Copyright (c) 1998, 1999 by Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 * 
 * 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 AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE 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 SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 * 
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */
 
package com.arcle.rmt.j2se.swing.ui;    // repackage

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

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;

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

    public ExampleFileFilter(String extension) {
    this(extension,null);
    }

    public ExampleFileFilter(String extension, String description) {
    this();
    if(extension!=null) addExtension(extension);
    if(description!=null) setDescription(description);
    }

    public ExampleFileFilter(String[] filters) {
    this(filters, null);
    }

    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);
    }

    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;
    }
}

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