PreferenceDialog.java

package de.mukis.gemini.sample.rcp.dialogs;

import javax.inject.Inject;
import javax.inject.Named;

import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.e4.core.di.extensions.Preference;
import org.eclipse.e4.core.services.log.Logger;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.osgi.service.prefs.BackingStoreException;

public class PreferenceDialog extends TitleAreaDialog {

	private Text txtURL;
	private Text txtUser;
	private Text txtPassword;
	private ComboViewer comboDriver;

	@Inject
	@Preference
	IEclipsePreferences preferences;

	@Inject
	Logger log;

	/**
	 * Create the dialog.
	 * 
	 * @param parentShell
	 */
	@Inject
	public PreferenceDialog(@Named(IServiceConstants.ACTIVE_SHELL) Shell parentShell) {
		super(parentShell);
		setTitle("Set your database preferences");
	}

	/**
	 * Create contents of the dialog.
	 * 
	 * @param parent
	 */
	@Override
	protected Control createDialogArea(Composite parent) {
		Composite area = (Composite) super.createDialogArea(parent);
		Composite container = new Composite(area, SWT.NONE);
		container.setLayout(new GridLayout(2, false));
		container.setLayoutData(new GridData(GridData.FILL_BOTH));

		Label lblDriver = new Label(container, SWT.NONE);
		lblDriver.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
		lblDriver.setText("Driver");

		comboDriver = new ComboViewer(container, SWT.NONE);
		comboDriver.setContentProvider(ArrayContentProvider.getInstance());
		comboDriver.setInput(new String[] { "org.apache.derby.jdbc.EmbeddedDriver", "com.mysql.jdbc.Driver" });
		Combo combo = comboDriver.getCombo();
		combo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

		Label lblUrl = new Label(container, SWT.NONE);
		lblUrl.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
		lblUrl.setText("URL");

		txtURL = new Text(container, SWT.BORDER);
		txtURL.setText("jdbc:derby:memory:test;create=true");
		txtURL.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

		Label lblUser = new Label(container, SWT.NONE);
		lblUser.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
		lblUser.setText("User");

		txtUser = new Text(container, SWT.BORDER);
		txtUser.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

		Label lblPassword = new Label(container, SWT.NONE);
		lblPassword.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
		lblPassword.setText("Password");

		txtPassword = new Text(container, SWT.BORDER | SWT.PASSWORD);
		txtPassword.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

		setMessage("Set your database preferences");
		return area;
	}

	/**
	 * Create contents of the button bar.
	 * 
	 * @param parent
	 */
	@Override
	protected void createButtonsForButtonBar(Composite parent) {
		createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
		createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
	}

	@Override
	protected void okPressed() {
		IStructuredSelection selection = (IStructuredSelection) comboDriver.getSelection();
		String driver = selection.isEmpty() ? "org.apache.derby.jdbc.EmbeddedDriver" : selection.getFirstElement().toString();

		try {
			preferences.put("jdbc_driver", driver);
			preferences.put("jdbc_url", txtURL.getText());
			preferences.putBoolean("jdbc_reconnect", true);
			preferences.flush();
		} catch (BackingStoreException e) {
			e.printStackTrace();
		}
		super.okPressed();
	}

	/**
	 * Return the initial size of the dialog.
	 */
	@Override
	protected Point getInitialSize() {
		return new Point(450, 300);
	}

}