filefilter.java

非常好用的代码源代码统计分析工具的源代码

/*
 * FileFilter.java - a generic file filter.
 * Copyright (C) 2003-2004 Rob Spoor
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package nl.icemanx.io;

import java.io.File;
import java.util.*;

/**
 * A generic file filter.
 *
 * @author Rob Spoor
 * @version 0.4, 2003-12-29
 */
public class FileFilter extends javax.swing.filechooser.FileFilter
                        implements java.io.FileFilter
{
    /**
     * A set with extensions.
     */
    protected Set extensions;

    /**
     * The description of the file filter.
     */
    protected String description;

    /**
     * Creates a generic file filter.
     *
     * @param extensions A set with extensions to filter on.
     * @param description The description of the file filter.
     */
    public FileFilter(Set extensions, String description)
    {
        this.extensions = extensions;
        this.description = description;
    }

    /**
     * Creates a generic file filter.
     *
     * @param extensions An array with extensions to filter on.
     * @param description The description of the file filter.
     */
    public FileFilter(String[] extensions, String description)
    {
        this(new HashSet(Arrays.asList(extensions)), description);
    }

    /**
     * Creates a generic file filter.
     *
     * @param extension An extension to filter on.
     * @param description The description of the file filter.
     * @since 0.3
     */
    public FileFilter(String extension, String description)
    {
        this(new HashSet(Collections.singleton(extension)), description);
    }

    /**
     * Creates a generic file filter without any extensions.
     *
     * @param description The description of the file filter.
     * @since 0.3
     */
    public FileFilter(String description)
    {
        this(new HashSet(), description);
    }

    /**
     * Adds an extension with a description if it was not yet present.
     *
     * @param extension The extension to add.
     * @return This file filter.
     * @since 0.3
     */
    public FileFilter addExtension(String extension)
    {
        extensions.add(extension);
        return this;
    }

    /**
     * Removes an extension with its description if it was present.
     *
     * @param extension The extension to remove.
     * @return This file filter.
     * @since 0.3
     */
    public FileFilter removeExtension(String extension)
    {
        extensions.remove(extension);
        return this;
    }

    /**
     * Whether the given file is accepted by this filter.
     *
     * @param f The file to check.
     * @return <tt>true</tt> iff <tt>f</tt> has one of the extensions of the
     *         file filter.
     */
    public boolean accept(File f)
    {
        if (f.isDirectory())
        {
            return true;
        }
        String filename = f.getName();
        for (Iterator i = extensions.iterator(); i.hasNext(); )
        {
            if (filename.endsWith("." + i.next()))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * @return The description of this filter.
     * @since 0.3
     */
    public String getDescription()
    {
        return description;
    }
}