taverna-workbench-credential-manager-ui/src/main/java/net/sf/taverna/t2/workbench/ui/credentialmanager/GetPasswordDialog.java

/*******************************************************************************
 * Copyright (C) 2007 The University of Manchester   
 * 
 *  Modifications to the initial code base are copyright of their
 *  respective authors, or their employers as appropriate.
 * 
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1 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
 *  Lesser General Public License for more details.
 *    
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 ******************************************************************************/
package net.sf.taverna.t2.workbench.ui.credentialmanager;

import static java.awt.BorderLayout.CENTER;
import static java.awt.BorderLayout.NORTH;
import static java.awt.BorderLayout.SOUTH;
import static java.awt.Font.PLAIN;
import static javax.swing.JOptionPane.WARNING_MESSAGE;
import static javax.swing.JOptionPane.showMessageDialog;
import static net.sf.taverna.t2.workbench.ui.credentialmanager.CMStrings.WARN_TITLE;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.border.EmptyBorder;

import net.sf.taverna.t2.workbench.helper.NonBlockedHelpEnabledDialog;

/**
 * A general dialog for entering a password.
 * 
 * @author Alex Nenadic
 */
@SuppressWarnings("serial")
public class GetPasswordDialog extends NonBlockedHelpEnabledDialog {
	/** Instructions for user explaining the purpose of the password */
	private String instructions = null;
	/* Password entry password field */
	private JPasswordField passwordField;
	/* Stores the password entered */
	private String password = null;

	public GetPasswordDialog(JFrame parent, String title, boolean modal,
			String instr) {
		super(parent, title, modal);
		instructions = instr;
		initComponents();
	}

	public GetPasswordDialog(JDialog parent, String title, boolean modal,
			String instr) {
		super(parent, title, modal);
		instructions = instr;
		initComponents();
	}

	private void initComponents() {
		getContentPane().setLayout(new BorderLayout());

		JLabel passwordLabel = new JLabel("Password");
		passwordField = new JPasswordField(15);

		JButton okButton = new JButton("OK");
		okButton.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent evt) {
				okPressed();
			}
		});

		JButton cancelButton = new JButton("Cancel");
		cancelButton.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent evt) {
				cancelPressed();
			}
		});

		JLabel instructionsLabel; // Instructions
		if (instructions != null) {
			instructionsLabel = new JLabel(instructions);
			instructionsLabel.setFont(new Font(null, PLAIN, 11));
			instructionsLabel.setBorder(new EmptyBorder(5, 5, 5, 5));
			getContentPane().add(instructionsLabel, NORTH);
		}
        
        JPanel passwordPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        passwordPanel.add(passwordLabel);
        passwordPanel.add(passwordField);
        passwordPanel.setBorder(new EmptyBorder(5, 5, 5, 5));

        JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        buttonsPanel.add(okButton);
        buttonsPanel.add(cancelButton);

        getContentPane().add(passwordPanel, CENTER);
        getContentPane().add(buttonsPanel, SOUTH);

		addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent evt) {
				closeDialog();
			}
		});

        setResizable(false);
        getRootPane().setDefaultButton(okButton);
        pack();
	}

	/**
	 * Get the password entered in the dialog.
	 */
	public String getPassword() {
		return password;
	}

	/**
	 * Check that the password entered is not empty and store the entered
	 * password.
	 */
	private boolean checkPassword() {
		password = new String(passwordField.getPassword());

		if (password.isEmpty()) {
			showMessageDialog(this, "The password cannot be empty",
					WARN_TITLE, WARNING_MESSAGE);
			return false;
		}

		return true;
	}

	private void okPressed() {
        if (checkPassword())
            closeDialog();
    }

	private void cancelPressed() {
		password = null;
		closeDialog();
	}

	private void closeDialog() {
		setVisible(false);
		dispose();
	}
}