/*
 * Created on Feb 17, 2005
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package org.eclipse.jst.j2ee.navigator.internal;

import org.eclipse.core.resources.IProject;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jst.j2ee.internal.J2EEEditModel;
import org.eclipse.jst.j2ee.internal.project.J2EENature;
import org.eclipse.wst.common.internal.emfworkbench.integration.EditModelEvent;
import org.eclipse.wst.common.internal.emfworkbench.integration.EditModelListener;

/**
 * @author Admin
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class NonFlexibleEMFModelManager extends EMFModelManager implements EditModelListener{

	private J2EEEditModel editModel;
	private Object rootObject;
	private static final Object[] EMPTY_OBJECT = new Object[0];
	/**
	 * @param aProject
	 * @param provider
	 */
	public NonFlexibleEMFModelManager(IProject aProject, EMFRootObjectProvider provider) {
		super(aProject, provider);
		// TODO Auto-generated constructor stub
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jst.j2ee.navigator.internal.EMFModelManager#getModels()
	 */
	public Object[] getModels() {
		// TODO Auto-generated method stub
		if (getProject() == null || !getProject().isAccessible())
			return EMPTY_OBJECT;
		
		//synchronized (rootObject) {
			if (rootObject == null || ((EObject) rootObject).eResource() == null) {
				J2EEEditModel editModel = getEditModel();
				if (editModel != null) {
					rootObject = editModel.getPrimaryRootObject();
				}
			}
		//}
		if (rootObject==null) 
			return EMPTY_OBJECT;
		else {
			Object[] objects = new Object[1];
			objects[0] = rootObject;
			return objects;
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jst.j2ee.navigator.internal.EMFModelManager#dispose()
	 */
	public void dispose() {
		if (editModel != null) {
			editModel.removeListener(this);
			editModel.releaseAccess(this);
			editModel = null;
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.internal.emfworkbench.integration.EditModelListener#editModelChanged(org.eclipse.wst.common.internal.emfworkbench.integration.EditModelEvent)
	 */
	public void editModelChanged(EditModelEvent anEvent) {
		IProject affectedProject = anEvent.getEditModel().getProject();
		switch (anEvent.getEventCode()) {
			case EditModelEvent.UNLOADED_RESOURCE :
			case EditModelEvent.REMOVED_RESOURCE : 
				if (rootObject != null){
					notifyListeners(affectedProject);
			     }
				break;
			case EditModelEvent.SAVE : {
				if (rootObject == null)
					notifyListeners(affectedProject);
				}
				break;
			case EditModelEvent.PRE_DISPOSE :
					dispose();
				break;
			default :
				break;
		}
		
	}
	
	
	protected J2EEEditModel getEditModel() {
		IProject project = getProject();
		if (project == null)
			return null;
		
		//synchronized (editModel) {
			if (editModel == null && project.isAccessible()) {
				//System.out.println("getEditModelForProject " + project.getName());
				J2EENature nature = J2EENature.getRegisteredRuntime(project);
				if (nature != null) {
					editModel = nature.getJ2EEEditModelForRead(this);
					if (editModel != null) {
						editModel.addListener(this);
					}
				}
			}
		//}
		return editModel;
	}
	
	protected void disposeCache(IProject affectedProject) {
		//synchronized (editModel) {
			if (editModel != null) {
				editModel.removeListener(this);
				editModel.releaseAccess(this);
				editModel = null;
			}
		//}
	}


}