Java tutorial
/* Copyright (C) 2003-2011 JabRef contributors. This program is free software; you can redistribute it and/or modify it under the terms of the GNU 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ package net.sf.jabref.sql; import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; import java.util.Arrays; import javax.swing.*; import net.sf.jabref.Globals; import com.jgoodies.forms.builder.ButtonBarBuilder; import com.jgoodies.forms.builder.DefaultFormBuilder; import com.jgoodies.forms.layout.FormLayout; /** * Dialog box for collecting database connection strings from the user * * @author pattonlk */ public class DBConnectDialog extends JDialog { // input fields private final JComboBox cmbServerType = new JComboBox(); private final JTextField txtServerHostname = new JTextField(40); private final JTextField txtDatabase = new JTextField(40); private final JTextField txtUsername = new JTextField(40); private final JPasswordField pwdPassword = new JPasswordField(40); private DBStrings dbStrings = new DBStrings(); private boolean connectToDB = false; /** Creates a new instance of DBConnectDialog */ public DBConnectDialog(JFrame parent, DBStrings dbs) { super(parent, Globals.lang("Connect to SQL database"), true); this.setResizable(false); this.setLocationRelativeTo(parent); dbStrings = dbs; // build collections of components ArrayList<JLabel> lhs = new ArrayList<JLabel>(); JLabel lblServerType = new JLabel(); lhs.add(lblServerType); JLabel lblServerHostname = new JLabel(); lhs.add(lblServerHostname); JLabel lblDatabase = new JLabel(); lhs.add(lblDatabase); JLabel lblUsername = new JLabel(); lhs.add(lblUsername); JLabel lblPassword = new JLabel(); lhs.add(lblPassword); ArrayList<JComponent> rhs = new ArrayList<JComponent>(); rhs.add(cmbServerType); rhs.add(txtServerHostname); rhs.add(txtDatabase); rhs.add(txtUsername); rhs.add(pwdPassword); // setup label text lblServerType.setText(Globals.lang("Server Type :")); lblServerHostname.setText(Globals.lang("Server Hostname :")); lblDatabase.setText(Globals.lang("Database :")); lblUsername.setText(Globals.lang("Username :")); lblPassword.setText(Globals.lang("Password :")); // set label text alignment for (JLabel label : lhs) { label.setHorizontalAlignment(SwingConstants.RIGHT); } // set button text JButton btnConnect = new JButton(); btnConnect.setText(Globals.lang("Connect")); JButton btnCancel = new JButton(); btnCancel.setText(Globals.lang("Cancel")); // init input fields to current DB strings String srvSel = dbStrings.getServerType(); String[] srv = dbStrings.getServerTypes(); for (String aSrv : srv) { cmbServerType.addItem(aSrv); } cmbServerType.setSelectedItem(srvSel); txtServerHostname.setText(dbStrings.getServerHostname()); txtDatabase.setText(dbStrings.getDatabase()); txtUsername.setText(dbStrings.getUsername()); pwdPassword.setText(dbStrings.getPassword()); // construct dialog DefaultFormBuilder builder = new DefaultFormBuilder(new FormLayout("right:pref, 4dlu, fill:pref", "")); builder.getPanel().setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); // add labels and input fields builder.append(lblServerType); builder.append(cmbServerType); builder.nextLine(); builder.append(lblServerHostname); builder.append(txtServerHostname); builder.nextLine(); builder.append(lblDatabase); builder.append(txtDatabase); builder.nextLine(); builder.append(lblUsername); builder.append(txtUsername); builder.nextLine(); builder.append(lblPassword); builder.append(pwdPassword); builder.nextLine(); // add the panel to the CENTER of your dialog: getContentPane().add(builder.getPanel(), BorderLayout.CENTER); // add buttons are added in a similar way: ButtonBarBuilder bb = new ButtonBarBuilder(); bb.addGlue(); bb.addButton(btnConnect); bb.addButton(btnCancel); bb.addGlue(); // add the buttons to the SOUTH of your dialog: getContentPane().add(bb.getPanel(), BorderLayout.SOUTH); pack(); ActionListener connectAction = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String errorMessage = checkInput(); if (errorMessage == null) { storeSettings(); setVisible(false); setConnectToDB(true); } else { JOptionPane.showMessageDialog(null, errorMessage, "Input Error", JOptionPane.ERROR_MESSAGE); } } }; btnConnect.addActionListener(connectAction); txtDatabase.addActionListener(connectAction); txtServerHostname.addActionListener(connectAction); txtUsername.addActionListener(connectAction); pwdPassword.addActionListener(connectAction); AbstractAction cancelAction = new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { setVisible(false); dispose(); setConnectToDB(false); } }; btnCancel.addActionListener(cancelAction); // Key bindings: ActionMap am = builder.getPanel().getActionMap(); InputMap im = builder.getPanel().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW); im.put(Globals.prefs.getKey("Close dialog"), "close"); am.put("close", cancelAction); } /** * Checks the user input, and ensures that required fields have entries * * @return * Appropriate error message to be displayed to user */ private String checkInput() { String[] fields = { "Server Hostname", "Database", "Username" }; String[] errors = new String[fields.length]; int cnt = 0; if (txtServerHostname.getText().trim().isEmpty()) { errors[cnt] = fields[0]; cnt++; } if (txtDatabase.getText().trim().isEmpty()) { errors[cnt] = fields[1]; cnt++; } if (txtUsername.getText().trim().isEmpty()) { errors[cnt] = fields[2]; cnt++; } String errMsg = Globals.lang("Please specify the "); switch (cnt) { case 0: errMsg = null; break; case 1: errMsg = errMsg + errors[0] + '.'; break; case 2: errMsg = errMsg + errors[0] + " and " + errors[1] + '.'; break; case 3: errMsg = errMsg + errors[0] + ", " + errors[1] + ", and " + errors[2] + '.'; break; default: } return errMsg; } /** * Save user input. */ private void storeSettings() { dbStrings.setServerType(cmbServerType.getSelectedItem().toString()); dbStrings.setServerHostname(txtServerHostname.getText()); dbStrings.setDatabase(txtDatabase.getText()); dbStrings.setUsername(txtUsername.getText()); // Store these settings so they appear as default next time: dbStrings.storeToPreferences(); char[] pwd = pwdPassword.getPassword(); String tmp = ""; for (char aPwd : pwd) { tmp = tmp + aPwd; } dbStrings.setPassword(tmp); Arrays.fill(pwd, '0'); } public DBStrings getDBStrings() { return dbStrings; } public void setDBStrings(DBStrings dbStrings) { this.dbStrings = dbStrings; } public boolean getConnectToDB() { return connectToDB; } private void setConnectToDB(boolean connectToDB) { this.connectToDB = connectToDB; } }