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

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

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/*
 * Copyright (c) 2012 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
 */
package org.eclipse.scanning.event.ui;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.scanning.event.ui.preference.CommandConstants;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin {

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

    // The shared instance
    private static Activator plugin;

    /**
     * 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;
    }

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

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

    public static ImageDescriptor getImageDescriptor(String path) {
        return imageDescriptorFromPlugin(PLUGIN_ID, path);
    }

    public static final String getJmsUri() {

        String uri = null;
        if (uri == null)
            uri = getNovelCommandPreference(CommandConstants.JMS_URI);
        if (uri == null)
            uri = System.getProperty("org.eclipse.scanning.broker.uri");
        if (uri == null)
            uri = System.getProperty("gda.activemq.broker.uri"); // GDA specific but not a compilation dependency.
        if (uri == null)
            uri = CommandConstants.DEFAULT_JMS_URI;

        return uri;
    }

    /**
     * Get the command value if it has been changed by the user.
     * @param key
     * @return
     */
    private static final String getNovelCommandPreference(String key) {
        final IPreferenceStore store = getDefault().getPreferenceStore();
        String val = store.getString(key);
        String def = store.getDefaultString(key);
        if (!val.equals(def))
            return val;
        return null;
    }

}