| /********************************************************************** |
| * This file is part of the "Object Teams Runtime Environment" |
| * |
| * Copyright 2002-2009 Berlin Institute of Technology, Germany. |
| * |
| * 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 |
| * $Id: AttributeReadingGuard.java 23408 2010-02-03 18:07:35Z stephan $ |
| * |
| * Please visit http://www.objectteams.org for updates and contact. |
| * |
| * Contributors: |
| * Berlin Institute of Technology - Initial API and implementation |
| **********************************************************************/ |
| package org.eclipse.objectteams.otre.util; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * @author Christine Hundt |
| * @author Stephan Herrmann |
| */ |
| public class AttributeReadingGuard { |
| |
| private static Map<Object, AttributeReadingGuard> instances = new HashMap<Object, AttributeReadingGuard>(); |
| private static AttributeReadingGuard defaultInstance = new AttributeReadingGuard(); |
| |
| private ArrayList<String> servedClasses = new ArrayList<String>(); |
| |
| // this one flag is really global (concerns the one main class of the application): |
| private static boolean firstLoaded = true; |
| |
| /** |
| * @param className |
| * @return |
| */ |
| public boolean iAmTheFirst(String className) { |
| return !this.servedClasses.contains(className); |
| } |
| |
| /** |
| * Processing the given class is done. |
| * @param className |
| */ |
| public void workDone(String className) { |
| this.servedClasses.add(className); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder buf = new StringBuilder("AttributeReadingGuard with served classes:"); |
| for (String clazz : servedClasses) { |
| buf.append("\n\t"+clazz); |
| } |
| return buf.toString(); |
| } |
| |
| /** |
| * @return whether this class is the first being loaded => possibly the main class. |
| */ |
| public static synchronized boolean isFirstLoadedClass() { |
| if (!firstLoaded) |
| return false; |
| firstLoaded = false; |
| return true; |
| } |
| |
| /** First loaded class has no main => it was a false alarm. */ |
| public static void reset() { |
| firstLoaded = true; |
| } |
| |
| /** |
| * Since actual data are stored in an instance, static methods need to retrieve the appropriate |
| * instance regarding the given token (s.t. like a class loader). |
| */ |
| public static AttributeReadingGuard getInstanceForLoader(Object token) { |
| if (token == null) |
| return defaultInstance; |
| |
| AttributeReadingGuard instance = instances.get(token); |
| if (instance == null) |
| instances.put(token, instance = new AttributeReadingGuard()); |
| return instance; |
| } |
| } |