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The source code

// $Header: /home/cvs/jakarta-jmeter/src/core/org/apache/jmeter/gui/util/FileDialoger.java,v 1.7 2004/02/13 02:21:38 sebb Exp $
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
*/

package org.apache.jmeter.gui.util;

import java.io.File;

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

import org.apache.jmeter.gui.GuiPackage;
import org.apache.jmeter.gui.JMeterFileFilter;
import org.apache.jmeter.util.JMeterUtils;

/**
 * @author    Michael Stover
 * @version   $Revision: 1.7 $
 */
public final class FileDialoger
{
    /**
     * The last directory visited by the user while choosing Files.
     */
    public static String lastJFCDirectory = null;//TODO: make private?
    public static JFileChooser jfc = new JFileChooser();//TODO: make private?

    /**
     * Prevent instantiation of utility class.
     */
    private FileDialoger()
    {
    }

    /**
     * Prompts the user to choose a file from their filesystems for our own
     * devious uses. This method maintains the last directory the user visited
     * before dismissing the dialog. This does NOT imply they actually chose a
     * file from that directory, only that they closed the dialog there. It is
     * the caller's responsibility to check to see if the selected file is
     * non-null.
     *
     * @return   the JFileChooser that interacted with the user, after they are
     *           finished using it (accept or otherwise).
     */
    public static JFileChooser promptToOpenFile(String[] exts)
    {
        //JFileChooser jfc = null;

        if (lastJFCDirectory == null)
        {
            String start = JMeterUtils.getPropDefault("user.dir", "");

            if (!start.equals(""))
            {
                jfc.setCurrentDirectory(new File(start));
            }
        }
        clearFileFilters();
        jfc.addChoosableFileFilter(new JMeterFileFilter(exts));
        int retVal =
            jfc.showOpenDialog(GuiPackage.getInstance().getMainFrame());
        lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();

        if (retVal == JFileChooser.APPROVE_OPTION)
        {
            return jfc;
        }
        else
        {
            return null;
        }
    }

    private static void clearFileFilters()
    {
        FileFilter[] filters = jfc.getChoosableFileFilters();
        for (int x = 0; x < filters.length; x++)
        {
            jfc.removeChoosableFileFilter(filters[x]);
        }
    }

    public static JFileChooser promptToOpenFile()
    {
        return promptToOpenFile(new String[0]);
    }

    /**
     * Prompts the user to choose a file from their filesystems for our own
     * devious uses. This method maintains the last directory the user visited
     * before dismissing the dialog. This does NOT imply they actually chose a
     * file from that directory, only that they closed the dialog there. It is
     * the caller's responsibility to check to see if the selected file is
     * non-null.
     *
     * @return   the JFileChooser that interacted with the user, after they
     *           are finished using it (accept or otherwise).
     * @see             #promptToOpenFile
     */
    public static JFileChooser promptToSaveFile(String filename)
    {
        if (lastJFCDirectory == null)
        {
            String start = JMeterUtils.getPropDefault("user.dir", "");
            if (!start.equals(""))
            {
                jfc = new JFileChooser(new File(start));
            }
            lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();
        }
        String ext = ".jmx";
        if (filename != null)
        {
            jfc.setSelectedFile(new File(lastJFCDirectory, filename));
            int i = -1;
            if ((i = filename.indexOf(".")) > -1)
            {
                ext = filename.substring(i);
            }
        }
        clearFileFilters();
        jfc.addChoosableFileFilter(new JMeterFileFilter(new String[] { ext }));

        int retVal =
            jfc.showSaveDialog(GuiPackage.getInstance().getMainFrame());
        lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();
        if (retVal == JFileChooser.APPROVE_OPTION)
        {
            return jfc;
        }
        else
        {
            return null;
        }
    }
}
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