org.eclipse.scanning.device.ui.Activator.java Source code

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Here is the source code for org.eclipse.scanning.device.ui.Activator.java

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/*-
 *******************************************************************************
 * Copyright (c) 2011, 2016 Diamond Light Source Ltd.
 * 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:
 *    Matthew Gerring - initial API and implementation and/or initial documentation
 *******************************************************************************/
package org.eclipse.scanning.device.ui;

import java.util.Collection;
import java.util.LinkedHashSet;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceStore;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.scanning.api.IServiceResolver;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;

public class Activator extends AbstractUIPlugin implements IServiceResolver {

    // The plug-in ID
    public static final String PLUGIN_ID = "org.eclipse.scanning.device.ui"; //$NON-NLS-1$

    // The shared instance
    private static Activator plugin;
    private BundleContext context;

    /**
     * The constructor
     */
    public Activator() {
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
     */
    public void start(BundleContext context) throws Exception {
        super.start(context);
        plugin = this;
        this.context = context;
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
     */
    public void stop(BundleContext context) throws Exception {
        plugin = null;
        this.context = null;
        super.stop(context);
    }

    /**
     * Returns the shared instance
     *
     * @return the shared instance
     */
    public static Activator getDefault() {
        return plugin;
    }

    private static IPreferenceStore store;

    public static IPreferenceStore getStore() {
        if (plugin != null)
            return plugin.getPreferenceStore();
        if (store == null)
            store = new PreferenceStore();
        return store;
    }

    public static ImageDescriptor getImageDescriptor(String path) {
        if (plugin == null) {
            final ImageData data = new ImageData("../" + PLUGIN_ID + "/" + path);
            return new ImageDescriptor() {
                @Override
                public ImageData getImageData() {
                    return data;
                }
            };
        }
        return imageDescriptorFromPlugin(PLUGIN_ID, path);
    }

    @Override
    public <T> T getService(Class<T> serviceClass) {
        if (context == null)
            return null;
        ServiceReference<T> ref = context.getServiceReference(serviceClass);
        return context.getService(ref);
    }

    @Override
    public <T> Collection<T> getServices(Class<T> serviceClass) throws InvalidSyntaxException {
        if (context == null)
            return null;
        Collection<ServiceReference<T>> refs = context.getServiceReferences(serviceClass, null);
        if (refs == null)
            return null;
        Collection<T> ret = new LinkedHashSet<T>(refs.size());
        for (ServiceReference<T> ref : refs)
            ret.add(context.getService(ref));
        return ret;
    }

}