LTKUIPlugin.java

/*=============================================================================#
 # Copyright (c) 2009-2016 Stephan Wahlbrink (WalWare.de) and others.
 # 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:
 #     Stephan Wahlbrink - initial API and implementation
 #=============================================================================*/

package de.walware.ecommons.ltk.internal.ui;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.model.WorkbenchLabelProvider;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.eclipse.ui.statushandlers.StatusManager;
import org.osgi.framework.BundleContext;

import de.walware.ecommons.ICommonStatusConstants;
import de.walware.ecommons.IDisposable;
import de.walware.ecommons.ui.util.ImageRegistryUtil;

import de.walware.ecommons.ltk.ui.LTKUI;


public class LTKUIPlugin extends AbstractUIPlugin {
	
	
	public static final String PLUGIN_ID = "de.walware.ecommons.ltk.ui"; //$NON-NLS-1$
	
	
	/** The shared instance */
	private static LTKUIPlugin gPlugin;
	
	/**
	 * Returns the shared sharedshared instance
	 * 
	 * @return the shared instance
	 */
	public static LTKUIPlugin getInstance() {
		return gPlugin;
	}
	
	
	private boolean fStarted;
	
	private final List<IDisposable> fDisposables = new ArrayList<>();
	
	private WorkbenchLabelProvider fWorkbenchLabelProvider;
	
	public LTKUIPlugin() {
	}
	
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void start(final BundleContext context) throws Exception {
		super.start(context);
		gPlugin = this;
		
		fStarted = true;
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void stop(final BundleContext context) throws Exception {
		try {
			synchronized (this) {
				fStarted = false;
				
				if (fWorkbenchLabelProvider != null) {
					try {
						if (PlatformUI.isWorkbenchRunning() &&
								!PlatformUI.getWorkbench().isClosing()) {
							fWorkbenchLabelProvider.dispose();
						}
					}
					catch (final Exception e) {
						StatusManager.getManager().handle(new Status(IStatus.ERROR, PLUGIN_ID, -1,
								"An error occurred when disposing the shared WorkbenchLabelProvider.", e));
					}
					fWorkbenchLabelProvider = null;
				}
			}
			
			for (final IDisposable listener : fDisposables) {
				try {
					listener.dispose();
				}
				catch (final Throwable e) {
					getLog().log(new Status(IStatus.ERROR, PLUGIN_ID, ICommonStatusConstants.INTERNAL_PLUGGED_IN, "Error occured when dispose module", e)); 
				}
			}
			fDisposables.clear();
		}
		finally {
			gPlugin = null;
			super.stop(context);
		}
	}
	
	
	public void addStoppingListener(final IDisposable listener) {
		if (listener == null) {
			throw new NullPointerException();
		}
		synchronized (this) {
			if (!fStarted) {
				throw new IllegalStateException("Plug-in is not started.");
			}
			fDisposables.add(listener);
		}
	}
	
	@Override
	protected void initializeImageRegistry(final ImageRegistry reg) {
		if (!fStarted) {
			throw new IllegalStateException("Plug-in is not started.");
		}
		final ImageRegistryUtil util = new ImageRegistryUtil(this);
		
		util.register(LTKUI.OBJ_TEXT_TEMPLATE_IMAGE_ID, ImageRegistryUtil.T_OBJ, "text-template.png"); //$NON-NLS-1$
		util.register(LTKUI.OBJ_TEXT_AT_TAG_IMAGE_ID, ImageRegistryUtil.T_OBJ, "text-at_tag.png"); //$NON-NLS-1$
		util.register(LTKUI.OBJ_TEXT_LINKEDRENAME_IMAGE_ID, ImageRegistryUtil.T_OBJ, "text-linked_rename.png"); //$NON-NLS-1$
	}
	
	
	/**
	 * Access to resource decoration.
	 */
	public synchronized WorkbenchLabelProvider getWorkbenchLabelProvider() {
		if (fWorkbenchLabelProvider == null) {
			if (!fStarted) {
				throw new IllegalStateException("Plug-in is not started.");
			}
			fWorkbenchLabelProvider = new WorkbenchLabelProvider();
		}
		return fWorkbenchLabelProvider;
	}
	
}