org.openscada.core.ui.connection.Activator.java Source code

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Here is the source code for org.openscada.core.ui.connection.Activator.java

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/*
 * This file is part of the OpenSCADA project
 * Copyright (C) 2006-2012 TH4 SYSTEMS GmbH (http://th4-systems.com)
 *
 * OpenSCADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenSCADA 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenSCADA. If not, see
 * <http://opensource.org/licenses/lgpl-3.0.html> for a copy of the LGPLv3 License.
 */

package org.openscada.core.ui.connection;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.databinding.observable.Observables;
import org.eclipse.core.databinding.observable.set.IObservableSet;
import org.eclipse.core.databinding.observable.set.ObservableSet;
import org.eclipse.core.databinding.observable.set.WritableSet;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdapterFactory;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.openscada.core.ui.connection.data.ConnectionDiscovererAdapterFactory;
import org.openscada.core.ui.connection.data.ConnectionDiscovererBean;
import org.openscada.core.ui.connection.data.ConnectionHolder;
import org.openscada.core.ui.connection.data.ConnectionHolderAdapterFactory;
import org.openscada.core.ui.connection.data.ConnectionManager;
import org.openscada.core.ui.connection.views.tree.ConnectionTreeManager;
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.openscada.core.ui.connection";

    public static final String EXTP_CONNECTON_DISCOVERER = "org.openscada.core.ui.connection.discoverer";

    private static final String ELE_DISCOVERER = "discoverer";

    // The shared instance
    private static Activator plugin;

    private ObservableSet discoverers;

    private WritableSet treeRoot;

    private final Map<Class<?>, IAdapterFactory> adaperFactories = new HashMap<Class<?>, IAdapterFactory>();

    private ConnectionManager connectionManager;

    private ConnectionTreeManager treeRootManager;

    public static final Root ROOT = new Root();

    /**
     * The constructor
     */
    public Activator() {
        this.adaperFactories.put(ConnectionDiscovererBean.class, new ConnectionDiscovererAdapterFactory());
        this.adaperFactories.put(ConnectionHolder.class, new ConnectionHolderAdapterFactory());
    }

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

        this.treeRoot = new WritableSet(SWTObservables.getRealm(getWorkbench().getDisplay()));
        this.treeRootManager = new ConnectionTreeManager(this.treeRoot);

        this.connectionManager = new ConnectionManager(context);

        for (final Map.Entry<Class<?>, IAdapterFactory> entry : this.adaperFactories.entrySet()) {
            Platform.getAdapterManager().registerAdapters(entry.getValue(), entry.getKey());
        }

    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
     */
    @Override
    public void stop(final BundleContext context) throws Exception {
        for (final Map.Entry<Class<?>, IAdapterFactory> entry : this.adaperFactories.entrySet()) {
            Platform.getAdapterManager().unregisterAdapters(entry.getValue(), entry.getKey());
        }

        if (this.connectionManager != null) {
            this.connectionManager.dispose();
            this.connectionManager = null;
        }

        this.treeRootManager.dispose();
        this.treeRoot.dispose();

        plugin = null;
        super.stop(context);
    }

    public IObservableSet getDiscovererSet() {
        synchronized (this) {
            if (this.discoverers == null) {
                this.discoverers = createDiscoverers();
            }
            return Observables.proxyObservableSet(this.discoverers);
        }
    }

    public ObservableSet getTreeRoot() {
        return this.treeRoot;
    }

    private ObservableSet createDiscoverers() {
        final WritableSet result = new WritableSet(SWTObservables.getRealm(getWorkbench().getDisplay()));

        for (final IConfigurationElement ele : Platform.getExtensionRegistry()
                .getConfigurationElementsFor(EXTP_CONNECTON_DISCOVERER)) {
            if (ELE_DISCOVERER.equals(ele.getName())) {
                final String id = ele.getAttribute("id");
                String name = ele.getAttribute("name");
                if (name == null) {
                    name = id;
                }

                final String icon = ele.getAttribute("icon");
                ImageDescriptor imageDescriptor = null;
                if (icon != null) {
                    imageDescriptor = AbstractUIPlugin.imageDescriptorFromPlugin(ele.getContributor().getName(),
                            icon);
                }

                final String description = ele.getAttribute("description");

                // create
                try {
                    final ConnectionDiscovererBean bean = new ConnectionDiscovererBean(id, name, description,
                            imageDescriptor, (ConnectionDiscoverer) ele.createExecutableExtension("class"));
                    result.add(bean);
                } catch (final CoreException e) {
                    getLog().log(e.getStatus());
                }
            }
        }

        return result;
    }

    public ConnectionManager getConnectionManager() {
        return this.connectionManager;
    }

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

    public static ConnectionManager getDefaultConectionManager() {
        return getDefault().getConnectionManager();
    }

}