EDIT

package eu.etaxonomy.taxeditor.security;

import java.util.EnumSet;

import java.util.List;

import org.eclipse.core.expressions.PropertyTester;

import org.eclipse.jface.viewers.IStructuredSelection;

import eu.etaxonomy.cdm.model.common.CdmBase;

import eu.etaxonomy.cdm.model.permission.CRUD;

import eu.etaxonomy.cdm.persistence.permission.CdmAuthority;

import eu.etaxonomy.taxeditor.store.CdmStore;

import eu.etaxonomy.taxeditor.store.StoreUtil;

/**

 * Checks if the currently authenticated user for {@link CdmAuthority} assignments.

 *

 * @author andreas

 */

public class PermissionPropertyTester extends PropertyTester {

	private static final String HAS_PERMISSIONS = "hasPermissions";

	private static final String CREATE = CRUD.CREATE.toString();

	private static final String READ = CRUD.READ.toString();

	private static final String UPDATE = CRUD.UPDATE.toString();

	private static final String DELETE = CRUD.DELETE.toString();

	@Override

	public boolean test(Object receiver, String property, Object[] args,

			Object expectedValue) {

		if(property.equals(HAS_PERMISSIONS)){

			return checkHasPermission(receiver, args);

		}

		return false;

	}

	private boolean checkHasPermission(Object receiver, Object[] args) {

		EnumSet<CRUD> crudSet = crudSetFromArgs(args);

		List<Object> selectedElements = ((IStructuredSelection) receiver).toList();

		for(Object selectedElement : selectedElements){

			if(selectedElement instanceof CdmBase && ! CdmStore.currentAuthentiationHasPermission(StoreUtil.getCdmEntity(selectedElement), crudSet)){

				return false;

			}

		}

		return true;

	}

	private EnumSet<CRUD> crudSetFromArgs(Object[] args) {

		EnumSet<CRUD> crudSet = EnumSet.noneOf(CRUD.class);

		for(int i = 0; i < args.length; i++){

			try {

				crudSet.add(CRUD.valueOf(args[i].toString()));

			} catch (Exception e){

				System.err.println("could not add " + args[i]);

			}

		}

		return crudSet;

	}

}