xfilefilter.java

XBrowser是一个完全免费并且开源的Web浏览器

/****************************************************************
*              XBrowser  -  eXtended web Browser                *
*                                                               *
*           Copyright (c) 2000-2001  Armond Avanes              *
*     Refer to ReadMe & License files for more information      *
*                                                               *
*                                                               *
*                      By: Armond Avanes                        *
*       [e-mail]     &    [e-mail]        *
*                http://xbrowser.sourceforge.net/               *
*****************************************************************/
package xbrowser.widgets;

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

public class XFileFilter extends FileFilter
{
	public XFileFilter()
	{
		filters = new Hashtable();
	}

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

	public XFileFilter(String extension, String description)
	{
		this();

		if (extension != null)
			addExtension(extension);

		if (description != null)
			setDescription(description);
	}

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

	public XFileFilter(String[] filters, String description)
	{
		this();

		for (int i = 0; i < filters.length; i++)
			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(extension) != 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;
	}

// Attributes:
	private Hashtable   filters = null;
	private String		description = null;
	private String		fullDescription = null;
	private boolean		useExtensionsInDescription = true;
}