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	/*
	* Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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 General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This source code is provided to illustrate the usage of a given feature
	* or technique and has been deliberately simplified. Additional steps
	* required for a production-quality application, such as security checks,
	* input validation and proper error handling, might not be present in
	* this sample code.
	*/


	package com.sun.tools.example.debug.gui;

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

	//### Renamed from 'ExampleFileFilter.java' provided with Swing demos.

	/**
	* 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);
	*
	* @author Jeff Dinkins
	*/

	public class JDBFileFilter extends FileFilter {

	private static String TYPE_UNKNOWN = "Type Unknown";
	private static String HIDDEN_FILE = "Hidden File";

	private Hashtable<String, JDBFileFilter> 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 JDBFileFilter() {
	this.filters = new Hashtable<String, JDBFileFilter>();
	}

	/**
	* Creates a file filter that accepts files with the given extension.
	* Example: new JDBFileFilter("jpg");
	*
	* @see #addExtension
	*/
	public JDBFileFilter(String extension) {
	this(extension,null);
	}

	/**
	* Creates a file filter that accepts the given file type.
	* Example: new JDBFileFilter("jpg", "JPEG Image Images");
	*
	* Note that the "." before the extension is not needed. If
	* provided, it will be ignored.
	*
	* @see #addExtension
	*/
	public JDBFileFilter(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 JDBFileFilter(String {"gif", "jpg"});
	*
	* Note that the "." before the extension is not needed adn
	* will be ignored.
	*
	* @see #addExtension
	*/
	public JDBFileFilter(String[] filters) {
	this(filters, null);
	}

	/**
	* Creates a file filter from the given string array and description.
	* Example: new JDBFileFilter(String {"gif", "jpg"}, "Gif and JPG Images");
	*
	* Note that the "." before the extension is not needed and will be ignored.
	*
	* @see #addExtension
	*/
	public JDBFileFilter(String[] filters, String description) {
	this();
	for (String filter : filters) {
	// add filters one by one
	addExtension(filter);
	}
	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
	*/
	@Override
	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":
	*
	* JDBFileFilter filter = new JDBFileFilter();
	* 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<String, JDBFileFilter>(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
	*/
	@Override
	public String getDescription() {
	if(fullDescription == null) {
	if(description == null \|\| isExtensionListInDescription()) {
	fullDescription = description==null ? "(" : description + " (";
	// build the description from the extension list
	Enumeration<String> extensions = filters.keys();
	if(extensions != null) {
	fullDescription += "." + extensions.nextElement();
	while (extensions.hasMoreElements()) {
	fullDescription += ", " + 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;
	}
	}

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