//------------------------------------------------------------------------------
// Copyright (c) 2005, 2006 IBM Corporation and others.
// 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:
// IBM Corporation - initial implementation
//------------------------------------------------------------------------------
package org.eclipse.epf.library.persistence.internal;

import java.util.Collection;
import java.util.Iterator;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.epf.library.persistence.ILibraryResourceSet;
import org.eclipse.epf.persistence.FileManager;
import org.eclipse.epf.persistence.MultiFileResourceSetImpl;
import org.eclipse.epf.services.IAccessController;

/**
 * @author Phong Nguyen Le - Oct 9, 2006
 * @since  1.0
 */
public class AccessController implements IAccessController {

	public AccessController() {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.epf.uma.util.IAccessController#checkModify(java.util.Collection, java.lang.Object)
	 */
	public IStatus checkModify(Collection eObjects, Object context) {
		if(eObjects.isEmpty()) {
			return Status.OK_STATUS;
		}
		ResourceSet resourceSet = null;
		for (Iterator iter = eObjects.iterator(); iter.hasNext();) {
			EObject o = (EObject) iter.next();
			Resource resource = o.eResource();
			if(resource != null) {
				resourceSet = resource.getResourceSet();
				if(resourceSet != null) {
					break;
				}
			}
		}
		if(resourceSet instanceof ILibraryResourceSet) {
			return ((ILibraryResourceSet)resourceSet).checkModify(eObjects, context);
		}
		return Status.OK_STATUS;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.epf.uma.util.IAccessController#checkModify(org.eclipse.emf.ecore.resource.Resource[], java.lang.Object)
	 */
	public IStatus checkModify(Resource[] resources, Object context) {
		if(resources.length == 0) {
			return Status.OK_STATUS;
		}
		ResourceSet resourceSet = null;
		for (int i = 0; i < resources.length; i++) {
			Resource resource = resources[i];
			if(resource != null) {
				resourceSet = resource.getResourceSet();
				if(resourceSet != null) {
					break;
				}
			}
		}
		if(resourceSet instanceof MultiFileResourceSetImpl) {
			String[] paths = new String[resources.length];
			for (int i = 0; i < resources.length; i++) {
				Resource resource = resources[i];
				paths[i] = resource.getURI().toFileString();
			}
			return FileManager.getInstance().checkModify(paths, context);
		}
		return Status.OK_STATUS;		
	}

}