/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare (INFN). 2006-2016
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.glite.security.voms.admin.operations.users;

import org.glite.security.voms.User;
import org.glite.security.voms.admin.event.EventManager;
import org.glite.security.voms.admin.event.user.attribute.UserAttributeDeletedEvent;
import org.glite.security.voms.admin.operations.BaseAttributeRWOperation;
import org.glite.security.voms.admin.operations.VOMSContext;
import org.glite.security.voms.admin.persistence.dao.VOMSUserDAO;
import org.glite.security.voms.admin.persistence.error.NoSuchUserException;
import org.glite.security.voms.admin.persistence.model.VOMSUser;
import org.glite.security.voms.admin.persistence.model.attribute.VOMSUserAttribute;

public class DeleteUserAttributeOperation extends BaseAttributeRWOperation {

  VOMSUser user;

  String attributeName;

  private DeleteUserAttributeOperation(VOMSUser u, String aName) {

    super(VOMSContext.getVoContext());

    user = u;
    attributeName = aName;
  }

  public Object doExecute() {

    VOMSUserAttribute attribute = VOMSUserDAO.instance().deleteAttribute(user,
      attributeName);
    
    if (attribute != null) {
      EventManager.instance().dispatch(new UserAttributeDeletedEvent(user, attribute));
    }
    return null;
  }

  public static DeleteUserAttributeOperation instance(VOMSUser u, String aName) {

    return new DeleteUserAttributeOperation(u, aName);
  }

  public static DeleteUserAttributeOperation instance(User u, String aName) {

    VOMSUser vomsUser = (VOMSUser) FindUserOperation.instance(u.getDN(),
      u.getCA()).execute();

    if (vomsUser == null)
      throw new NoSuchUserException("User '" + u.getDN() + "," + u.getCA()
        + "' not found in this vo.");

    return new DeleteUserAttributeOperation(vomsUser, aName);
  }
}