/**
 * 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.acls;

import java.util.Map;

import org.glite.security.voms.admin.error.NullArgumentException;
import org.glite.security.voms.admin.error.VOMSException;
import org.glite.security.voms.admin.event.EventManager;
import org.glite.security.voms.admin.event.vo.acl.ACLUpdatedEvent;
import org.glite.security.voms.admin.operations.BaseVomsOperation;
import org.glite.security.voms.admin.operations.VOMSPermission;
import org.glite.security.voms.admin.persistence.model.ACL;
import org.glite.security.voms.admin.persistence.model.VOMSAdmin;

public class SetACLOperation extends BaseVomsOperation {

  Map<VOMSAdmin, VOMSPermission> permissions;
  ACL theACL;

  private SetACLOperation(ACL acl, Map<VOMSAdmin, VOMSPermission> perms) {

    if (acl == null)
      throw new NullArgumentException("acl cannot be null!");

    if (perms == null)
      throw new NullArgumentException("perms cannot be null!");

    theACL = acl;
    permissions = perms;
  }

  public static SetACLOperation instance(ACL acl,
    Map<VOMSAdmin, VOMSPermission> perms) {

    return new SetACLOperation(acl, perms);
  }

  @Override
  protected Object doExecute() {

    if (permissions.isEmpty() && !theACL.isDefautlACL())
      throw new VOMSException(
        "Will not replace the current ACL with an empty one.");

    // Drop old permissions
    theACL.getPermissions().clear();

    // Set the new permission set
    theACL.getPermissions().putAll(permissions);
    
    EventManager.instance().dispatch(new ACLUpdatedEvent(theACL));

    return theACL;
  }

  @Override
  protected void setupPermissions() {

    VOMSPermission perms = VOMSPermission.getEmptyPermissions()
      .setACLReadPermission().setACLWritePermission();

    if (theACL.isDefautlACL())
      perms.setACLDefaultPermission();

    addRequiredPermission(theACL.getContext(), perms);

  }

}