/**
 *                                                                            
 *  Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, 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                                 
 *                                                                            
 *  Contributors:                                                      
 * 	   Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation
 * 
 */
package org.eclipse.osbp.xtext.action;

import org.eclipse.xtext.junit4.GlobalRegistries;
import org.eclipse.xtext.junit4.GlobalRegistries.GlobalStateMemento;
import org.eclipse.xtext.junit4.IInjectorProvider;
import org.eclipse.xtext.junit4.IRegistryConfigurator;

import com.google.inject.Injector;

public class ActionDSLInjectorProvider implements IInjectorProvider, IRegistryConfigurator {
	
    protected GlobalStateMemento stateBeforeInjectorCreation;
	protected GlobalStateMemento stateAfterInjectorCreation;
	protected Injector injector;

	static {
		GlobalRegistries.initializeDefaults();
	}

	public Injector getInjector()
	{
		if (injector == null) {
			stateBeforeInjectorCreation = GlobalRegistries.makeCopyOfGlobalState();
			this.injector = internalCreateInjector();
			stateAfterInjectorCreation = GlobalRegistries.makeCopyOfGlobalState();
		}
		return injector;
	}
	
	protected Injector internalCreateInjector() {
	    return new ActionDSLStandaloneSetup().createInjectorAndDoEMFRegistration();
	}

	public void restoreRegistry() {
		stateBeforeInjectorCreation.restoreGlobalState();
	}

	public void setupRegistry() {
		getInjector();
		stateAfterInjectorCreation.restoreGlobalState();
	}
}