eu.esdihumboldt.hale.ui.cache.CachePreferencePage.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.cache.CachePreferencePage.java

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/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available 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.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.cache;

import java.io.IOException;

import org.eclipse.jface.preference.BooleanFieldEditor;
import org.eclipse.jface.preference.FieldEditorPreferencePage;
import org.eclipse.jface.preference.PreferenceStore;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;

import de.fhg.igd.osgi.util.OsgiUtils;
import de.fhg.igd.osgi.util.configuration.IConfigurationService;
import de.fhg.igd.osgi.util.configuration.JavaPreferencesConfigurationService;
import de.fhg.igd.osgi.util.configuration.NamespaceConfigurationServiceDecorator;
import eu.esdihumboldt.hale.common.cache.Request;

/**
 * The preference page for cache settings.
 * 
 * @author Andreas Burchert
 * @partner 01 / Fraunhofer Institute for Computer Graphics Research
 */
public class CachePreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {

    private final IConfigurationService configService;
    private static final String DELIMITER = "/"; //$NON-NLS-1$

    private final PreferenceStore prefs;

    /**
     * Constructor.
     */
    public CachePreferencePage() {
        super(GRID);

        IConfigurationService org = OsgiUtils.getService(IConfigurationService.class);
        if (org == null) {
            // if no configuration service is present, fall back to new instance

            // 1. use user prefs, may not have rights to access system prefs
            // 2. no default properties
            // 3. default to system properties
            org = new JavaPreferencesConfigurationService(false, null, true);
        }

        configService = new NamespaceConfigurationServiceDecorator(org,
                Request.class.getPackage().getName().replace(".", DELIMITER), //$NON-NLS-1$
                DELIMITER);

        // TODO implement preference store based on configuration service
        prefs = new PreferenceStore() {

            @Override
            public void load() throws IOException {
                setValue("cache.enabled", configService.getBoolean("hale.cache.enabled", true));
            }

            @Override
            public void save() throws IOException {
                configService.setBoolean("hale.cache.enabled", getBoolean("cache.enabled"));
            }

        };
        try {
            prefs.load();
        } catch (IOException e) {
            // TODO log
        }
        setPreferenceStore(prefs);
    }

    /**
     * @see IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench)
     */
    @Override
    public void init(IWorkbench workbench) {
        // nothing to do here
    }

    @Override
    protected void createFieldEditors() {
        // add fields
        addField(new BooleanFieldEditor("cache.enabled", Messages.CachePreferencePage_10, getFieldEditorParent())); //$NON-NLS-1$

        Button clearCache = new Button(getFieldEditorParent(), GRID);
        clearCache.setText(Messages.CachePreferencePage_15);
        clearCache.addSelectionListener(new SelectionAdapter() {

            @Override
            public void widgetSelected(SelectionEvent e) {
                Request.getInstance().clear();
            }

        });
        clearCache.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, true, false, 1, 1));
    }

    /**
     * @see FieldEditorPreferencePage#performOk()
     */
    @Override
    public boolean performOk() {
        Request.getInstance().setCacheEnabled(prefs.getBoolean("cache.enabled")); //$NON-NLS-1$

        return super.performOk();
    }
}