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/**********************************************************************
* 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<ClassLoader, AttributeReadingGuard> instances = new HashMap<ClassLoader, 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);
}
/**
* @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 class loader.
*/
public static AttributeReadingGuard getInstanceForLoader(ClassLoader loader) {
if (loader == null)
return defaultInstance;
AttributeReadingGuard instance = instances.get(loader);
if (instance == null)
instances.put(loader, instance = new AttributeReadingGuard());
return instance;
}
}
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