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// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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
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// under the License.

package org.apache.impala.util;

import org.apache.impala.thrift.TSessionState;

/**
 * Utility functions for working with TSessionState objects.
 */
public class TSessionStateUtil {
  /**
   * Returns the actual user to perform authorisation against for the provided
   * session. That is, returns the delegated user for a session if set, otherwise
   * returns the connected user.
   */
  public static String getEffectiveUser(TSessionState session) {
    if (session.getDelegated_user() != null &&
        !session.getDelegated_user().isEmpty()) {
      return session.getDelegated_user();
    }
    return session.getConnected_user();
  }
}