/**
 * 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.groups;

import org.glite.security.voms.admin.error.NullArgumentException;
import org.glite.security.voms.admin.operations.BaseVomsOperation;
import org.glite.security.voms.admin.operations.VOMSContext;
import org.glite.security.voms.admin.operations.VOMSPermission;
import org.glite.security.voms.admin.persistence.dao.VOMSGroupDAO;
import org.glite.security.voms.admin.persistence.dao.VOMSRoleDAO;
import org.glite.security.voms.admin.persistence.model.VOMSGroup;
import org.glite.security.voms.admin.persistence.model.VOMSRole;
import org.glite.security.voms.admin.util.PathNamingScheme;

public class FindContextOperation extends BaseVomsOperation {

  VOMSContext theContext = null;

  String contextString = null;

  private FindContextOperation(String contextString) {

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

    PathNamingScheme.checkSyntax(contextString);

    this.contextString = contextString;
  }

  public static FindContextOperation instance(String contextString) {

    return new FindContextOperation(contextString);
  }

  @Override
  protected Object doExecute() {

    String groupName = PathNamingScheme.getGroupName(contextString);
    VOMSGroup g = VOMSGroupDAO.instance().findByName(groupName);

    if (PathNamingScheme.isQualifiedRole(contextString)) {

      String roleName = PathNamingScheme.getRoleName(contextString);
      VOMSRole r = VOMSRoleDAO.instance().findByName(roleName);

      return VOMSContext.instance(g, r);
    }

    return VOMSContext.instance(g);
  }

  @Override
  protected void setupPermissions() {

    // A group part must be present in the contextString
    VOMSGroup g = VOMSGroupDAO.instance().findByName(
      PathNamingScheme.getGroupName(contextString));
    addRequiredPermissionOnPath(g, VOMSPermission.getContainerReadPermission());

  }

}