JMeter example source code file (FileDialoger.java)

This example JMeter source code file (FileDialoger.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - JMeter tags/keywords

file, filechooser, filedialoger, filefilter, gui, io, jfilechooser, jfilechooser, jmeterfilefilter, jmeterfilefilter, non-nls-1, non-nls-1, non-nls-2, string, string, swing

The JMeter FileDialoger.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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;

/**
 * Class implementing a file open dialogue
 */
public final class FileDialoger {
    /**
     * The last directory visited by the user while choosing Files.
     */
    private static String lastJFCDirectory = null;

    private static JFileChooser jfc = new JFileChooser();

    /**
     * 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 - null if no file was chosen
     */
    public static JFileChooser promptToOpenFile(String[] exts) {
        // JFileChooser jfc = null;

        if (lastJFCDirectory == null) {
            String start = System.getProperty("user.dir", ""); //$NON-NLS-1$//$NON-NLS-2$

            if (start.length() > 0) {
                jfc.setCurrentDirectory(new File(start));
            }
        }
        clearFileFilters();
        if(exts != null && exts.length > 0) {
            JMeterFileFilter currentFilter = new JMeterFileFilter(exts);
            jfc.addChoosableFileFilter(currentFilter);
            jfc.setAcceptAllFileFilterUsed(true);
            jfc.setFileFilter(currentFilter);
        }
        int retVal = jfc.showOpenDialog(GuiPackage.getInstance().getMainFrame());
        lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();

        if (retVal == JFileChooser.APPROVE_OPTION) {
            return jfc;
        }
        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 - null if no file was chosen
     * @see #promptToOpenFile()
     */
    public static JFileChooser promptToSaveFile(String filename) {
        return promptToSaveFile(filename, null);
    }

    /**
     * Get a JFileChooser with a new FileFilter.
     *
     * @param filename file name
     * @param extensions list of extensions
     * @return the FileChooser - null if no file was chosen
     */
    public static JFileChooser promptToSaveFile(String filename, String[] extensions) {
        if (lastJFCDirectory == null) {
            String start = System.getProperty("user.dir", "");//$NON-NLS-1$//$NON-NLS-2$
            if (start.length() > 0) {
                jfc = new JFileChooser(new File(start));
            }
            lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();
        }
        String ext = ".jmx";//$NON-NLS-1$
        if (filename != null) {
            jfc.setSelectedFile(new File(lastJFCDirectory, filename));
            int i = -1;
            if ((i = filename.lastIndexOf(".")) > -1) {//$NON-NLS-1$
                ext = filename.substring(i);
            }
        }
        clearFileFilters();
        if (extensions != null) {
            jfc.addChoosableFileFilter(new JMeterFileFilter(extensions));
        } else {
            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;
        }
        return null;
    }
}