eu.wwuk.eclipse.extsvcs.examples.client.prefs.LogPreferencePage.java Source code

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Here is the source code for eu.wwuk.eclipse.extsvcs.examples.client.prefs.LogPreferencePage.java

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/*******************************************************************************
 * Copyright (c) 2009 Neil Bartlett.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Neil Bartlett - initial API and implementation
 ******************************************************************************/
package eu.wwuk.eclipse.extsvcs.examples.client.prefs;

import java.util.concurrent.atomic.AtomicReference;

import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;
import org.osgi.service.log.LogService;

public class LogPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {

    private final AtomicReference<LogService> logRef = new AtomicReference<LogService>(null);

    private Composite container;
    private Label label;
    private Button button;

    @Override
    protected Control createContents(Composite parent) {
        container = new Composite(parent, SWT.NONE);

        label = new Label(container, SWT.NONE);

        button = new Button(container, SWT.PUSH);
        button.setText("Write to Log");

        updateLabelAndButton();

        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                LogService log = logRef.get();
                if (log != null)
                    log.log(LogService.LOG_ERROR, "This is a message from the button");
            }
        });

        container.setLayout(new GridLayout(2, false));

        return container;
    }

    public void init(IWorkbench workbench) {
    }

    private void updateLabelAndButton() {
        LogService log = logRef.get();
        if (log != null) {
            button.setEnabled(true);
            label.setText("LogService AVAILABLE");
        } else {
            button.setEnabled(false);
            label.setText("LogService Unavailable");
        }
    }

    public void setLogService(LogService log) {
        logRef.set(log);
        if (container != null && !container.isDisposed())
            container.getDisplay().asyncExec(new Runnable() {
                public void run() {
                    updateLabelAndButton();
                }
            });
    }

    public void unsetLogService(LogService log) {
        logRef.compareAndSet(log, null);
        if (container != null && !container.isDisposed())
            container.getDisplay().asyncExec(new Runnable() {
                public void run() {
                    updateLabelAndButton();
                }
            });
    }
}