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/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.photon.security.user;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;

import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.ext.ICommonsSet;

/**
 * Base read-only interface for objects containing users.
 *
 * @author Philip Helger
 */
public interface IUserContainer
{
  /**
   * @return true if at least one user is contained,
   *         false otherwise.
   */
  boolean hasContainedUsers ();

  /**
   * @return The number of contained users. Always ≥ 0.
   */
  @Nonnegative
  int getContainedUserCount ();

  /**
   * @return A non-nullbut maybe empty set of all assigned user
   *         IDs.
   */
  @Nonnull
  @ReturnsMutableCopy
  ICommonsSet  getAllContainedUserIDs ();

  /**
   * Check if the passed user is contained in this container.
   *
   * @param sUserID
   *        The user ID to check. May be null.
   * @return true if the user is contained in this container,
   *         false otherwise.
   */
  boolean containsUserID (String sUserID);
}