sernet.gs.ui.rcp.main.preferences.ClientServerPreferencePage.java Source code

Introduction

Here is the source code for sernet.gs.ui.rcp.main.preferences.ClientServerPreferencePage.java

Source

/*******************************************************************************
 * Copyright (c) 2009 Alexander Koderman <ak[at]sernet[dot]de>.
 * 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 3 
 * 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, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Alexander Koderman <ak[at]sernet[dot]de> - initial API and implementation
 ******************************************************************************/
package sernet.gs.ui.rcp.main.preferences;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.jface.preference.FieldEditorPreferencePage;
import org.eclipse.jface.preference.RadioGroupFieldEditor;
import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;
import org.eclipse.ui.internal.Workbench;

import sernet.gs.ui.rcp.main.Activator;

/**
 * Preference page to switch between client / server settings.
 * 
 * @author akoderman[at]sernet[dot]de
 * 
 */
public class ClientServerPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {

    private RadioGroupFieldEditor operationMode;
    private StringFieldEditor serverURI;

    private String oldServerMode, newServerMode;
    private String oldUrl, newUrl;

    public ClientServerPreferencePage() {
        super(GRID);
        setPreferenceStore(Activator.getDefault().getPreferenceStore());
        setDescription(Messages.getString("ClientServerPreferencePage.0")); //$NON-NLS-1$
    }

    /**
     * Creates the field editors. Field editors are abstractions of the common
     * GUI blocks needed to manipulate various types of preferences. Each field
     * editor knows how to save and restore itself.
     */
    @Override
    public void createFieldEditors() {
        createRadioGroup();

        serverURI = new StringFieldEditor(PreferenceConstants.VNSERVER_URI,
                Messages.getString("ClientServerPreferencePage.1"), getFieldEditorParent()); //$NON-NLS-1$
        addField(serverURI);

    }

    @Override
    public void setVisible(boolean visible) {
        super.setVisible(visible);
        if (visible) {
            boolean standalone = getPreferenceStore().getString(PreferenceConstants.OPERATION_MODE)
                    .equals(PreferenceConstants.OPERATION_MODE_INTERNAL_SERVER);

            serverURI.setEnabled(!standalone, getFieldEditorParent());
        }
    }

    @Override
    public void propertyChange(PropertyChangeEvent event) {
        super.propertyChange(event);
        if (event.getProperty().equals(FieldEditor.VALUE) && event.getSource() == operationMode) {
            newServerMode = (String) event.getNewValue();
            boolean servermode = newServerMode.equals(PreferenceConstants.OPERATION_MODE_REMOTE_SERVER);
            serverURI.setEnabled(servermode, getFieldEditorParent());
        }
        if (event.getProperty().equals(FieldEditor.VALUE) && event.getSource() == serverURI) {
            newUrl = (String) event.getNewValue();
        }
    }

    private boolean propertyChanged() {
        return (newServerMode != null && !newServerMode.equals(oldServerMode))
                || (newUrl != null && !newUrl.equals(oldUrl));
    }

    private void createRadioGroup() {
        String name = PreferenceConstants.OPERATION_MODE;
        String labelText = Messages.getString("ClientServerPreferencePage.4"); //$NON-NLS-1$
        String[][] labelAndValues = new String[][] { { Messages.getString("ClientServerPreferencePage.5"), //$NON-NLS-1$
                PreferenceConstants.OPERATION_MODE_INTERNAL_SERVER },
                { Messages.getString("ClientServerPreferencePage.6"), //$NON-NLS-1$
                        PreferenceConstants.OPERATION_MODE_REMOTE_SERVER } };

        operationMode = new RadioGroupFieldEditor(name, labelText, 1, labelAndValues, getFieldEditorParent());
        addField(operationMode);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench)
     */
    @Override
    public void init(IWorkbench workbench) {
        oldServerMode = getPreferenceStore().getString(PreferenceConstants.OPERATION_MODE);
        oldUrl = getPreferenceStore().getString(PreferenceConstants.VNSERVER_URI);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.preference.FieldEditorPreferencePage#performOk()
     */
    @Override
    public boolean performOk() {
        boolean returnValue = super.performOk();
        if (propertyChanged()) {
            MessageDialog mDialog = new MessageDialog(Display.getDefault().getActiveShell(),
                    Messages.getString("ClientServerPreferencePage.2"), //$NON-NLS-1$
                    null, Messages.getString("ClientServerPreferencePage.3"), //$NON-NLS-1$
                    MessageDialog.QUESTION, new String[] { Messages.getString("ClientServerPreferencePage.7"), //$NON-NLS-1$
                            Messages.getString("ClientServerPreferencePage.8") }, //$NON-NLS-1$
                    1);
            int result = mDialog.open();
            if (result == 1) {
                Workbench.getInstance().restart();
            }
        }
        return returnValue;
    }

}