/*
* ExampleFileFilter.java
*
* Created on 22 de junio de 2006, 11:19
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package proyectodpoo;
/*
* @(#)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
*/
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.
*/
public ExampleFileFilter() {
this.filters = new Hashtable();
}
/**
* Creates a file filter that accepts files
with the given extension.
* Example: new ExampleFileFilter("jpg");
*/
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.
*/
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.
*/
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.
*/
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.
*
*/
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 .
*
*/
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)"
*
*/
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");
*/
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();
*/
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();
*/
public boolean isExtensionListInDescription() {
return useExtensionsInDescription;
}
}