Provides some common swing dialogs in Java.

SimpleDialog.java

package net.zeddev.util;

import java.awt.Frame;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import java.util.logging.Logger;

/**
 * <p>
 * Provides some common swing dialogs.
 * Supported dialogs include the following;
 * <ul>
 * <li>message - A simple message box.</li>
 * <li>warning - A warning message box.</li>
 * <li>error - A error message box.</li>
 * <li>okcancel - A confirmation dialog.</li>
 * <li>yesno - A another confirmation dialog.</li>
 * <li>saveFile - A save file chooser dialog.</li>
 * <li>openFile - An open file chooser dialog.</li>
 * <li>selectDir - A directory chooser dialog</li>
 * </ul>
 * </p>
 * 
 * <p>
 * <b>NOTE:</b> This file is released as a stand-alone utility.  The original 
 * file and the associated unit test can be found on GitHub Gist - 
 * <a href="https://gist.github.com/zscott92/5544306">here</a>.
 * </p>
 *
 * @author Zachary Scott <zscott.dev@gmail.com>
 */
public final class SimpleDialog {

    private static final Logger logger = Logger.getLogger(SimpleDialog.class.getName());

	private SimpleDialog() {
	}

	/**
	 * Shows a info message box.
	 *
	 * @param parent The parent of the message box.
	 * @param title The title of the message box.
	 * @param msg The message to be displayed.
	 */
	public static void message(Frame parent, String title, String msg) {
		JOptionPane.showMessageDialog(parent, msg, title, JOptionPane.PLAIN_MESSAGE);
	}

	/**
	 * Shows a warning message box.
	 *
	 * @param parent The parent of the message box.
	 * @param msg The message to be displayed.
	 */
	public static void warning(Frame parent, String msg) {
		JOptionPane.showMessageDialog(parent, msg, "WARNING", JOptionPane.WARNING_MESSAGE);
	}

	/**
	 * Shows a error message box.
	 *
	 * @param parent The parent of the message box.
	 * @param msg The message to be displayed.
	 */
	public static void error(Frame parent, String msg) {
		JOptionPane.showMessageDialog(parent, msg, "ERROR", JOptionPane.ERROR_MESSAGE);
	}

	/**
	 * Displays a confirmation box with <code>Okay</code> and <code>Cancel</code>
	 * options.
	 *
	 * @param parent The parent of the message box.
	 * @param title The title of the message box.
	 * @param msg The question to be confirmed to be displayed.
	 * @return Whether the user pressed <code>Okay</code> or not.
	 */
	public static boolean okcancel(Frame parent, String title, String msg) {

		return JOptionPane.showConfirmDialog(
			parent, msg, title,
			JOptionPane.OK_CANCEL_OPTION,
			JOptionPane.PLAIN_MESSAGE
		) == JOptionPane.OK_OPTION;

	}

	/**
	 * Displays a confirmation box with <code>Yes</code> and <code>No</code>
	 * options.
	 *
	 * @param parent The parent of the message box.
	 * @param title The title of the message box.
	 * @param msg The question to be confirmed to be displayed.
	 * @return Whether the user pressed <code>Yes</code> or not.
	 */
	public static boolean yesno(Frame parent, String title, String msg) {

		return JOptionPane.showConfirmDialog(
			parent, msg, title,
			JOptionPane.YES_NO_OPTION,
			JOptionPane.PLAIN_MESSAGE
		) == JOptionPane.YES_OPTION;

	}

	/**
	 * Opens a save-file chooser dialog.
	 *
	 * @param parent The parent frame (can be <code>null</code>).
	 * @return The selected file (or <code>null</code> if error).
	 */
	public static File saveFile(final Frame parent) {

		JFileChooser fileChooser = new JFileChooser();
		int ret = fileChooser.showSaveDialog(parent);

		if (ret == JFileChooser.APPROVE_OPTION) {

			return fileChooser.getSelectedFile();

		} else if (ret == JFileChooser.ERROR_OPTION) {
			logger.warning("Error occured with file chooser when saving.");
			return null;
		} else {
			logger.info("User cancelled saving file.");
			return null;
		}

	}

	/**
	 * Opens a open-file chooser dialog.
	 *
	 * @param parent The parent frame (can be <code>null</code>).
	 * @return The selected file (or <code>null</code> if error).
	 */
	public static File openFile(final Frame parent) {

		JFileChooser fileChooser = new JFileChooser();
		int ret = fileChooser.showOpenDialog(parent);

		if (ret == JFileChooser.APPROVE_OPTION) {

			return fileChooser.getSelectedFile();

		} else if (ret == JFileChooser.ERROR_OPTION) {
			logger.warning("Error occured with file chooser when opening file.");
			return null;
		} else {
			logger.info("User cancelled choosing file.");
			return null;
		}

	}

	/**
	 * Opens a directory chooser dialog.
	 *
	 * @param parent The parent frame (can be <code>null</code>).
	 * @return The selected directory (or <code>null</code> if error).
	 */
	public static File selectDir(final Frame parent) {

		JFileChooser fileChooser = new JFileChooser();
		fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

		int ret = fileChooser.showDialog(parent, "Select");
		if (ret == JFileChooser.APPROVE_OPTION) {

			return fileChooser.getSelectedFile();

		} else if (ret == JFileChooser.ERROR_OPTION) {
			logger.warning("Error occured with file chooser when selecting directory.");
			return null;
		} else {
			logger.info("User cancelled selecting directory.");
			return null;
		}

	}

}

/* Copyright (C) 2013  Zachary Scott <zscott.dev@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION  OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */