build/org.eclipse.cdt.meson.core/src/org/eclipse/cdt/meson/core/Activator.java

/*******************************************************************************
 * Copyright (c) 2018 Red Hat Inc. and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Red Hat Inc. - initial version
 *******************************************************************************/
package org.eclipse.cdt.meson.core;

import java.lang.reflect.InvocationTargetException;
import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

public class Activator implements BundleActivator {

	private static BundleContext context;
	//The shared instance.
	private static Activator plugin;
	private ResourceBundle resourceBundle;

	public static final String PLUGIN_ID = "org.eclipse.cdt.meson.core"; //$NON-NLS-1$

	public Activator() {
		Assert.isTrue(plugin == null);
		plugin = this;
		try {
			resourceBundle = ResourceBundle.getBundle(PLUGIN_ID + ".Resources"); //$NON-NLS-1$
		} catch (MissingResourceException x) {
			resourceBundle = null;
		}
	}

	public static String getPluginId() {
		return PLUGIN_ID;
	}

	public static String getUniqueIdentifier() {
		if (getDefault() == null) {
			// If the default instance is not yet initialized,
			// return a static identifier. This identifier must
			// match the plugin id defined in plugin.xml
			return PLUGIN_ID;
		}
		return context.getBundle().getSymbolicName();
	}

	public Bundle getBundle() {
		return context.getBundle();
	}

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

	/**
	 * Return the OSGi service with the given service interface.
	 *
	 * @param service service interface
	 * @return the specified service or null if it's not registered
	 * @since 1.5
	 */
	public static <T> T getService(Class<T> service) {
		if (context != null) {
			ServiceReference<T> ref = context.getServiceReference(service);
			return ref != null ? context.getService(ref) : null;
		}
		return null;
	}

	public static void error(String message, Throwable cause) {
		log(errorStatus(message, cause));
	}

	public static IStatus errorStatus(String message, Throwable cause) {
		return new Status(IStatus.ERROR, PLUGIN_ID, message, cause);
	}

	/**
	 * Returns the string from the plugin's resource bundle,
	 * or 'key' if not found.
	 *
	 * @param key the message key
	 * @return the resource bundle message
	 */
	public static String getResourceString(String key) {
		ResourceBundle bundle = Activator.getDefault().getResourceBundle();
		try {
			return bundle.getString(key);
		} catch (MissingResourceException e) {
			return key;
		}
	}

	/**
	 * Returns the string from the plugin's resource bundle,
	 * or 'key' if not found.
	 *
	 * @param key the message key
	 * @param args an array of substituition strings
	 * @return the resource bundle message
	 */
	public static String getFormattedString(String key, String[] args) {
		return MessageFormat.format(getResourceString(key), (Object[]) args);
	}

	/**
	 * Returns the plugin's resource bundle,
	 */
	public ResourceBundle getResourceBundle() {
		return resourceBundle;
	}

	public static void log(IStatus status) {
		ResourcesPlugin.getPlugin().getLog().log(status);
	}

	public static void logErrorMessage(String message) {
		log(new Status(IStatus.ERROR, getUniqueIdentifier(), IStatus.ERROR, message, null));
	}

	public static void log(Throwable e) {
		if (e instanceof InvocationTargetException) {
			e = ((InvocationTargetException) e).getTargetException();
		}
		IStatus status = null;
		if (e instanceof CoreException) {
			status = ((CoreException) e).getStatus();
		} else {
			status = new Status(IStatus.ERROR, getUniqueIdentifier(), IStatus.OK, e.getMessage(), e);
		}
		log(status);
	}

	static BundleContext getContext() {
		return context;
	}

	@Override
	public void start(BundleContext bundleContext) {
		Activator.context = bundleContext;
	}

	@Override
	public void stop(BundleContext bundleContext) {
		Activator.context = null;
		plugin = null;
	}

}