LibhoverPlugin.java

/*******************************************************************************
 * Copyright (c) 2009, 2011 Red Hat, Inc.
 * 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:
 *     Red Hat Incorporated - initial API and implementation
 *******************************************************************************/
package org.eclipse.linuxtools.cdt.libhover;

import org.eclipse.core.resources.ISaveContext;
import org.eclipse.core.resources.ISaveParticipant;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.linuxtools.internal.cdt.libhover.LibHover;
import org.eclipse.linuxtools.internal.cdt.libhover.LibHoverLoadJob;
import org.eclipse.linuxtools.internal.cdt.libhover.LibHoverMessages;
import org.eclipse.linuxtools.internal.cdt.libhover.preferences.PreferenceConstants;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

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

    // The plug-in ID
    public static final String PLUGIN_ID = "org.eclipse.linuxtools.cdt.libhover"; //$NON-NLS-1$

    private static final String LOAD_JOB_TXT = "LibHover.LoadJob.txt"; //$NON-NLS-1$

    // The shared instance
    private static LibhoverPlugin plugin;

    // Location set aside for this plug-in to save state
    private static IPath stateLocation;

    // Preference store to use when saving libhover data
    private static IPreferenceStore preferenceStore;

    static {
        plugin = new LibhoverPlugin();
    }

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

    @Override
    public void start(BundleContext context) throws Exception {
        super.start(context);
        plugin = this;
        ResourcesPlugin.getWorkspace().addSaveParticipant(PLUGIN_ID,
                new ISaveParticipant() {
                    @Override
                    public void saving(ISaveContext saveContext) {
                        save();
                    }
                    @Override
                    public void rollback(ISaveContext saveContext) {}
                    @Override
                    public void prepareToSave(ISaveContext saveContext) {}
                    @Override
                    public void doneSaving(ISaveContext saveContext) {}
                });
        IPreferenceStore ps = getPreferenceStore();
        if (ps == null || !ps.getBoolean(PreferenceConstants.LAZY_LOAD)) {
            Job k = new LibHoverLoadJob(LibHoverMessages.getString(LOAD_JOB_TXT));
            k.schedule();
        }
    }

    private void save() {
        if (stateLocation == null)
            stateLocation = this.getStateLocation();
        if (preferenceStore == null)
            preferenceStore = this.getPreferenceStore();
        LibHover.saveLibraries(stateLocation, preferenceStore);
    }

    @Override
    public void stop(BundleContext context) throws Exception {
        stateLocation = this.getStateLocation();
        preferenceStore = this.getPreferenceStore();
        plugin = null;
        super.stop(context);
    }

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

}