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/*
 * Copyright 2008-2024 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright 2008-2024 Ping Identity Corporation
 *
 * 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.
 */
/*
 * Copyright (C) 2008-2024 Ping Identity Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see .
 */
package com.unboundid.ldap.sdk.unboundidds.tasks;



import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.unboundid.ldap.sdk.Attribute;
import com.unboundid.ldap.sdk.Entry;
import com.unboundid.util.NotMutable;
import com.unboundid.util.NotNull;
import com.unboundid.util.Nullable;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import com.unboundid.util.Validator;
import com.unboundid.util.args.DurationArgument;

import static com.unboundid.ldap.sdk.unboundidds.tasks.TaskMessages.*;



/**
 * This class defines a Directory Server task that can be used to back up one or
 * more Directory Server backends.
 * 

 * 

 *   NOTE:  This class, and other classes within the
 *   {@code com.unboundid.ldap.sdk.unboundidds} package structure, are only
 *   supported for use against Ping Identity, UnboundID, and
 *   Nokia/Alcatel-Lucent 8661 server products.  These classes provide support
 *   for proprietary functionality or for external specifications that are not
 *   considered stable or mature enough to be guaranteed to work in an
 *   interoperable way with other types of LDAP servers.
 * 

 * 

 * The properties that are available for use with this type of task include:
 * 
    
 *   
  • The path to the directory in which the backup should be placed.  If
 *       multiple backends are to be backed up at once, then this should be the
 *       parent of the backup directories for each backend.  This must be
 *       provided when scheduling this task.
    • 
 *   
  • The backend IDs of the backends to archive.  If this is not provided,
 *       then the server will attempt to back up all supported backends.
    • 
 *   
  • The backup ID to use for the backup.  If this is not provided, then the
 *       server will generate a backup ID.
    • 
 *   
  • A flag that indicates whether the backup should be an incremental
 *       backup (if the backend supports that capability) or a full backup.
    • 
 *   
  • The backup ID of the existing backup on which the incremental backup
 *       should be based.  If this is not provided and an incremental backup
 *       is to be performed, then it will be based on the most recent backup in
 *       the backup directory.
    • 
 *   
  • A flag that indicates whether to compress the contents of the
 *       backup.
    • 
 *   
  • A flag that indicates whether to encrypt the contents of the
 *       backup.
    • 
 *   
  • A flag that indicates whether to hash the contents of the backup to use
 *       as a checksum for verifying the integrity of the backup.
    • 
 *   
  • A flag that indicates whether to sign the backup hash in order to
 *       prevent anyone from tampering with it.
    • 
 *   
  • The path to a file containing a passphrase to use to generate the
 *       encryption key.
    • 
 *   
  • The ID of the encryption settings definition to use to generate the
 *       encryption key.
    • 
 *   
  • The maximum rate in megabytes per second at which the backup should be
 *       written.
    • 
 *   
  • The minimum number of previous full backups to retain.
    • 
 *   
  • The minimum age of previous full backups to retain.
    • 
 * 


 */
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class BackupTask
       extends Task
{
  /**
   * The fully-qualified name of the Java class that is used for the backup
   * task.
   */
  @NotNull static final String BACKUP_TASK_CLASS =
       "com.unboundid.directory.server.tasks.BackupTask";



  /**
   * The name of the attribute used to specify backend IDs of the backends to
   * archive.
   */
  @NotNull private static final String ATTR_BACKEND_ID =
       "ds-task-backup-backend-id";



  /**
   * The name of the attribute used to indicate whether to back up the contents
   * of all supported backends.
   */
  @NotNull private static final String ATTR_BACKUP_ALL = "ds-task-backup-all";



  /**
   * The name of the attribute used to specify the path to the directory in
   * which the backup is to be written.
   */
  @NotNull private static final String ATTR_BACKUP_DIRECTORY =
       "ds-backup-directory-path";



  /**
   * The name of the attribute used to specify the backup ID for the backup.
   */
  @NotNull private static final String ATTR_BACKUP_ID = "ds-backup-id";



  /**
   * The name of the attribute used to indicate whether to compress the backup.
   */
  @NotNull private static final String ATTR_COMPRESS =
       "ds-task-backup-compress";



  /**
   * The name of the attribute used to indicate whether to encrypt the backup.
   */
  @NotNull private static final String ATTR_ENCRYPT = "ds-task-backup-encrypt";



  /**
   * The name of the attribute used to specify the path to a file that contains
   * the passphrase to use to generate the encryption key.
   */
  @NotNull private static final String ATTR_ENCRYPTION_PASSPHRASE_FILE =
       "ds-task-backup-encryption-passphrase-file";



  /**
   * The name of the attribute used to specify the path to a file that contains
   * the ID of the encryption settings definition to use to generate the
   * encryption key.
   */
  @NotNull private static final String ATTR_ENCRYPTION_SETTINGS_DEFINITION_ID =
       "ds-task-backup-encryption-settings-definition-id";



  /**
   * The name of the attribute used to indicate whether to create a hash of the
   * backup.
   */
  @NotNull private static final String ATTR_HASH = "ds-task-backup-hash";



  /**
   * The name of the attribute used to indicate whether to perform an
   * incremental backup rather than a full backup.
   */
  @NotNull private static final String ATTR_INCREMENTAL =
       "ds-task-backup-incremental";



  /**
   * The name of the attribute used to specify the backup ID of the backup
   * on which to base the incremental backup.
   */
  @NotNull private static final String ATTR_INCREMENTAL_BASE_ID =
       "ds-task-backup-incremental-base-id";



  /**
   * The name of the attribute used to specify the maximum backup write rate in
   * megabytes per second.
   */
  @NotNull private static final String ATTR_MAX_MEGABYTES_PER_SECOND =
       "ds-task-backup-max-megabytes-per-second";



  /**
   * The name of the attribute used to specify the minimum age of previous full
   * backups to retain.
   */
  @NotNull private static final String ATTR_RETAIN_PREVIOUS_FULL_BACKUP_AGE =
       "ds-task-backup-retain-previous-full-backup-age";



  /**
   * The name of the attribute used to specify the number of previous full
   * backups to retain.
   */
  @NotNull private static final String ATTR_RETAIN_PREVIOUS_FULL_BACKUP_COUNT =
       "ds-task-backup-retain-previous-full-backup-count";



  /**
   * The name of the attribute used to indicate whether to sign the hash of the
   * backup.
   */
  @NotNull private static final String ATTR_SIGN_HASH =
       "ds-task-backup-sign-hash";



  /**
   * The name of the object class used in backup task entries.
   */
  @NotNull private static final String OC_BACKUP_TASK = "ds-task-backup";



  /**
   * The task property that will be used for the backup directory.
   */
  @NotNull private static final TaskProperty PROPERTY_BACKUP_DIRECTORY =
       new TaskProperty(ATTR_BACKUP_DIRECTORY,
            INFO_DISPLAY_NAME_BACKUP_DIRECTORY.get(),
            INFO_DESCRIPTION_BACKUP_DIRECTORY_BACKUP.get(),
            String.class, true, false, false);



  /**
   * The task property that will be used for the backend ID.
   */
  @NotNull private static final TaskProperty PROPERTY_BACKEND_ID =
       new TaskProperty(ATTR_BACKEND_ID, INFO_DISPLAY_NAME_BACKEND_ID.get(),
            INFO_DESCRIPTION_BACKEND_ID_BACKUP.get(), String.class, false, true,
            false);



  /**
   * The task property that will be used for the backup ID.
   */
  @NotNull private static final TaskProperty PROPERTY_BACKUP_ID =
       new TaskProperty(ATTR_BACKUP_ID, INFO_DISPLAY_NAME_BACKUP_ID.get(),
            INFO_DESCRIPTION_BACKUP_ID_BACKUP.get(), String.class, false, false,
            true);



  /**
   * The task property that will be used for the incremental flag.
   */
  @NotNull private static final TaskProperty PROPERTY_INCREMENTAL =
       new TaskProperty(ATTR_INCREMENTAL, INFO_DISPLAY_NAME_INCREMENTAL.get(),
            INFO_DESCRIPTION_INCREMENTAL.get(), Boolean.class, false, false,
            false);



  /**
   * The task property that will be used for the incremental base ID.
   */
  @NotNull private static final TaskProperty PROPERTY_INCREMENTAL_BASE_ID =
       new TaskProperty(ATTR_INCREMENTAL_BASE_ID,
            INFO_DISPLAY_NAME_INCREMENTAL_BASE_ID.get(),
            INFO_DESCRIPTION_INCREMENTAL_BASE_ID.get(), String.class, false,
            false, true);



  /**
   * The task property that will be used for the compress flag.
   */
  @NotNull private static final TaskProperty PROPERTY_COMPRESS =
       new TaskProperty(ATTR_COMPRESS, INFO_DISPLAY_NAME_COMPRESS.get(),
            INFO_DESCRIPTION_COMPRESS_BACKUP.get(), Boolean.class, false, false,
            false);



  /**
   * The task property that will be used for the encrypt flag.
   */
  @NotNull private static final TaskProperty PROPERTY_ENCRYPT =
       new TaskProperty(ATTR_ENCRYPT, INFO_DISPLAY_NAME_ENCRYPT.get(),
            INFO_DESCRIPTION_ENCRYPT_BACKUP.get(), Boolean.class, false, false,
            false);



  /**
   * The task property that will be used for the encryption passphrase file.
   */
  @NotNull private static final TaskProperty
       PROPERTY_ENCRYPTION_PASSPHRASE_FILE = new TaskProperty(
            ATTR_ENCRYPTION_PASSPHRASE_FILE,
            INFO_DISPLAY_NAME_ENCRYPTION_PASSPHRASE_FILE.get(),
            INFO_DESCRIPTION_ENCRYPTION_PASSPHRASE_FILE.get(),
            String.class, false, false, true);



  /**
   * The task property that will be used for the encryption settings definition
   * ID.
   */
  @NotNull private static final TaskProperty
       PROPERTY_ENCRYPTION_SETTINGS_DEFINITION_ID = new TaskProperty(
            ATTR_ENCRYPTION_SETTINGS_DEFINITION_ID,
            INFO_DISPLAY_NAME_ENCRYPTION_SETTINGS_DEFINITION_ID.get(),
            INFO_DESCRIPTION_ENCRYPTION_SETTINGS_DEFINITION_ID.get(),
            String.class, false, false, true);



  /**
   * The task property that will be used for the hash flag.
   */
  @NotNull private static final TaskProperty PROPERTY_HASH =
       new TaskProperty(ATTR_HASH, INFO_DISPLAY_NAME_HASH.get(),
            INFO_DESCRIPTION_HASH_BACKUP.get(), Boolean.class, false, false,
            false);



  /**
   * The task property that will be used for the sign hash flag.
   */
  @NotNull private static final TaskProperty PROPERTY_SIGN_HASH =
       new TaskProperty(ATTR_SIGN_HASH, INFO_DISPLAY_NAME_SIGN_HASH.get(),
            INFO_DESCRIPTION_SIGN_HASH_BACKUP.get(), Boolean.class, false,
            false, false);



  /**
   * The task property that will be used for the maximum write rate in megabytes
   * per second.
   */
  @NotNull private static final TaskProperty PROPERTY_MAX_MEGABYTES_PER_SECOND =
       new TaskProperty(ATTR_MAX_MEGABYTES_PER_SECOND,
            INFO_DISPLAY_NAME_BACKUP_MAX_MEGABYTES_PER_SECOND.get(),
            INFO_DESCRIPTION_BACKUP_MAX_MEGABYTES_PER_SECOND.get(),
            Long.class, false, false, true);



  /**
   * The task property that will be used for the retain previous full backup
   * age.
   */
  @NotNull private static final TaskProperty
       PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_AGE = new TaskProperty(
            ATTR_RETAIN_PREVIOUS_FULL_BACKUP_AGE,
            INFO_DISPLAY_NAME_BACKUP_RETAIN_AGE.get(),
            INFO_DESCRIPTION_BACKUP_RETAIN_AGE.get(),
            String.class, false, false, true);



  /**
   * The task property that will be used for the retain previous full backup
   * count.
   */
  @NotNull private static final TaskProperty
       PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_COUNT = new TaskProperty(
            ATTR_RETAIN_PREVIOUS_FULL_BACKUP_COUNT,
            INFO_DISPLAY_NAME_BACKUP_RETAIN_COUNT.get(),
            INFO_DESCRIPTION_BACKUP_RETAIN_COUNT.get(),
            Long.class, false, false, true);



  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 2637190942057174423L;



  // Indicates whether to compress the backup.
  private final boolean compress;

  // Indicates whether to encrypt the backup.
  private final boolean encrypt;

  // Indicates whether to generate a hash of the backup.
  private final boolean hash;

  // Indicates whether to sign the backup hash.
  private final boolean signHash;

  // Indicates whether to perform an incremental backup.
  private final boolean incremental;

  // The maximum backup write rate in megabytes per second.
  @Nullable private final Integer maxMegabytesPerSecond;

  // The retain previous full backup count.
  @Nullable private final Integer retainPreviousFullBackupCount;

  // The backend IDs of the backends to back up.
  @NotNull private final List backendIDs;

  // The path to the directory in which to write the backup.
  @NotNull private final String backupDirectory;

  // The backup ID to use for the backup.
  @Nullable private final String backupID;

  // The path to a file containing the passphrase to use to generate the
  // encryption key.
  @Nullable private final String encryptionPassphraseFile;

  // The identifier for the encryption settings definition to use to generate
  // the encryption key.
  @Nullable private final String encryptionSettingsDefinitionID;

  // The backup ID of the backup to use as the base for the incremental backup.
  @Nullable private final String incrementalBaseID;

  // The retain previous full backup age.
  @Nullable private final String retainPreviousFullBackupAge;



  /**
   * Creates a new uninitialized backup task instance which should only be
   * used for obtaining general information about this task, including the task
   * name, description, and supported properties.  Attempts to use a task
   * created with this constructor for any other reason will likely fail.
   */
  public BackupTask()
  {
    compress = false;
    encrypt = false;
    hash = false;
    signHash = false;
    incremental = false;
    maxMegabytesPerSecond = null;
    retainPreviousFullBackupCount = null;
    backendIDs = null;
    backupDirectory = null;
    backupID = null;
    encryptionPassphraseFile = null;
    encryptionSettingsDefinitionID = null;
    incrementalBaseID = null;
    retainPreviousFullBackupAge = null;
  }



  /**
   * Creates a new backup task with the provided information.
   *
   * @param  taskID           The task ID to use for this task.  If it is
   *                          {@code null} then a UUID will be generated for use
   *                          as the task ID.
   * @param  backupDirectory  The path to the directory on the server into which
   *                          the backup should be written.  If a single backend
   *                          is to be archived, then this should be the path to
   *                          the specific backup directory for that backend.
   *                          If multiple backends are to be archived, then this
   *                          should be the parent of the directories for each
   *                          of the backends.  It must not be {@code null}.
   * @param  backendID        The backend ID of the backend to back up.  It may
   *                          be {@code null} if all supported backends should
   *                          be backed up.
   */
  public BackupTask(@Nullable final String taskID,
                    @NotNull final String backupDirectory,
                    @Nullable final String backendID)
  {
    this(taskID, backupDirectory,
         ((backendID == null) ? null : Collections.singletonList(backendID)),
         null, false, null, false, false, false, false, null, null, null, null,
         null);
  }



  /**
   * Creates a new restore task with the provided information.
   *
   * @param  taskID                  The task ID to use for this task.  If it is
   *                                 {@code null} then a UUID will be generated
   *                                 for use as the task ID.
   * @param  backupDirectory         The path to the directory on the server
   *                                 into which the backup should be written.
   *                                 If a single backend is to be archived, then
   *                                 this should be the path to the specific
   *                                 backup directory for that backend.  If
   *                                 multiple backends are to be archived, then
   *                                 this should be the parent of the
   *                                 directories for each of the backends.  It
   *                                 must not be {@code null}.
   * @param  backendIDs              A list of the backend IDs of the backends
   *                                 to archive.  It may be {@code null} or
   *                                 empty if all supported backends should be
   *                                 archived.
   * @param  backupID                The backup ID to use for this backup.  It
   *                                 may be {@code null} to indicate that the
   *                                 server should generate the backup ID.
   * @param  incremental             Indicates whether to perform an incremental
   *                                 backup rather than a full backup.
   * @param  incrementalBaseID       The backup ID of the existing backup on
   *                                 which to base the incremental backup.  It
   *                                 may be {@code null} if this is not an
   *                                 incremental backup or if it should be based
   *                                 on the most recent backup.
   * @param  compress                Indicates whether the backup should be
   *                                 compressed.
   * @param  encrypt                 Indicates whether the backup should be
   *                                 encrypted.
   * @param  hash                    Indicates whether to generate a hash of the
   *                                 backup contents.
   * @param  signHash                Indicates whether to sign the hash of the
   *                                 backup contents.
   * @param  scheduledStartTime      The time that this task should start
   *                                 running.
   * @param  dependencyIDs           The list of task IDs that will be required
   *                                 to complete before this task will be
   *                                 eligible to start.
   * @param  failedDependencyAction  Indicates what action should be taken if
   *                                 any of the dependencies for this task do
   *                                 not complete successfully.
   * @param  notifyOnCompletion      The list of e-mail addresses of individuals
   *                                 that should be notified when this task
   *                                 completes.
   * @param  notifyOnError           The list of e-mail addresses of individuals
   *                                 that should be notified if this task does
   *                                 not complete successfully.
   */
  public BackupTask(@Nullable final String taskID,
              @NotNull final String backupDirectory,
              @Nullable final List backendIDs,
              @Nullable final String backupID,
              final boolean incremental,
              @Nullable final String incrementalBaseID,
              final boolean compress, final boolean encrypt,
              final boolean hash, final boolean signHash,
              @Nullable final Date scheduledStartTime,
              @Nullable final List dependencyIDs,
              @Nullable final FailedDependencyAction failedDependencyAction,
              @Nullable final List notifyOnCompletion,
              @Nullable final List notifyOnError)
  {
    this(taskID, backupDirectory, backendIDs, backupID, incremental,
         incrementalBaseID, compress, encrypt, null, null, hash, signHash,
         null, null, null, scheduledStartTime, dependencyIDs,
         failedDependencyAction, notifyOnCompletion, notifyOnError);
  }



  /**
   * Creates a new restore task with the provided information.
   *
   * @param  taskID                          The task ID to use for this task.
   *                                         If it is {@code null} then a UUID
   *                                         will be generated for use as the
   *                                         task ID.
   * @param  backupDirectory                 The path to the directory on the
   *                                         server into which the backup should
   *                                         be written.  If a single backend is
   *                                         to be archived, then this should be
   *                                         the path to the specific backup
   *                                         directory for that backend.  If
   *                                         multiple backends are to be
   *                                         archived, then this should be the
   *                                         parent of the directories for each
   *                                         of the backends.  It must not be
   *                                         {@code null}.
   * @param  backendIDs                      A list of the backend IDs of the
   *                                         backends to archive.  It may be
   *                                         {@code null} or empty if all
   *                                         supported backends should be
   *                                         archived.
   * @param  backupID                        The backup ID to use for this
   *                                         backup.  It may be {@code null} to
   *                                         indicate that the server should
   *                                         generate the backup ID.
   * @param  incremental                     Indicates whether to perform an
   *                                         incremental backup rather than a
   *                                         full backup.
   * @param  incrementalBaseID               The backup ID of the existing
   *                                         backup on which to base the
   *                                         incremental backup.  It may be
   *                                         {@code null} if this is not an
   *                                         incremental backup or if it should
   *                                         be based on the most recent backup.
   * @param  compress                        Indicates whether the backup should
   *                                         be compressed.
   * @param  encrypt                         Indicates whether the backup should
   *                                         be encrypted.
   * @param  encryptionPassphraseFile        The path to a file containing the
   *                                         passphrase to use to generate the
   *                                         encryption key.  It amy be
   *                                         {@code null} if the backup is not
   *                                         to be encrypted, or if the key
   *                                         should be obtained in some other
   *                                         way.
   * @param  encryptionSettingsDefinitionID  The ID of the encryption settings
   *                                         definition use to generate the
   *                                         encryption key.  It may be
   *                                         {@code null} if the backup is not
   *                                         to be encrypted, or if the key
   *                                         should be obtained in some other
   *                                         way.
   * @param  hash                            Indicates whether to generate a
   *                                         hash of the backup contents.
   * @param  signHash                        Indicates whether to sign the hash
   *                                         of the backup contents.
   * @param  maxMegabytesPerSecond           The maximum rate in megabytes per
   *                                         second at which the backup should
   *                                         be written.
   * @param  retainPreviousFullBackupCount   The minimum number of previous
   *                                         backups to retain.
   * @param  retainPreviousFullBackupAge     A string representation of the
   *                                         minimum age of previous backups to
   *                                         retain.  The age should be
   *                                         formatted in the same way as values
   *                                         for the {@link DurationArgument}
   *                                         class.
   * @param  scheduledStartTime              The time that this task should
   *                                         start running.
   * @param  dependencyIDs                   The list of task IDs that will be
   *                                         required to complete before this
   *                                         task will be eligible to start.
   * @param  failedDependencyAction          Indicates what action should be
   *                                         taken if any of the dependencies
   *                                         for this task do not complete
   *                                         successfully.
   * @param  notifyOnCompletion              The list of e-mail addresses of
   *                                         individuals that should be notified
   *                                         when this task completes.
   * @param  notifyOnError                   The list of e-mail addresses of
   *                                         individuals that should be notified
   *                                         if this task does not complete
   *                                         successfully.
   */
  public BackupTask(@Nullable final String taskID,
              @NotNull final String backupDirectory,
              @Nullable final List backendIDs,
              @Nullable final String backupID,
              final boolean incremental,
              @Nullable final String incrementalBaseID,
              final boolean compress, final boolean encrypt,
              @Nullable final String encryptionPassphraseFile,
              @Nullable final String encryptionSettingsDefinitionID,
              final boolean hash, final boolean signHash,
              @Nullable final Integer maxMegabytesPerSecond,
              @Nullable final Integer retainPreviousFullBackupCount,
              @Nullable final String retainPreviousFullBackupAge,
              @Nullable final Date scheduledStartTime,
              @Nullable final List dependencyIDs,
              @Nullable final FailedDependencyAction failedDependencyAction,
              @Nullable final List notifyOnCompletion,
              @Nullable final List notifyOnError)
  {
    this(taskID, backupDirectory, backendIDs, backupID, incremental,
         incrementalBaseID, compress, encrypt, encryptionPassphraseFile,
         encryptionSettingsDefinitionID, hash, signHash, maxMegabytesPerSecond,
         retainPreviousFullBackupCount, retainPreviousFullBackupAge,
         scheduledStartTime, dependencyIDs, failedDependencyAction, null,
         notifyOnCompletion, null, notifyOnError, null, null, null);
  }



  /**
   * Creates a new restore task with the provided information.
   *
   * @param  taskID                          The task ID to use for this task.
   *                                         If it is {@code null} then a UUID
   *                                         will be generated for use as the
   *                                         task ID.
   * @param  backupDirectory                 The path to the directory on the
   *                                         server into which the backup should
   *                                         be written.  If a single backend is
   *                                         to be archived, then this should be
   *                                         the path to the specific backup
   *                                         directory for that backend.  If
   *                                         multiple backends are to be
   *                                         archived, then this should be the
   *                                         parent of the directories for each
   *                                         of the backends.  It must not be
   *                                         {@code null}.
   * @param  backendIDs                      A list of the backend IDs of the
   *                                         backends to archive.  It may be
   *                                         {@code null} or empty if all
   *                                         supported backends should be
   *                                         archived.
   * @param  backupID                        The backup ID to use for this
   *                                         backup.  It may be {@code null} to
   *                                         indicate that the server should
   *                                         generate the backup ID.
   * @param  incremental                     Indicates whether to perform an
   *                                         incremental backup rather than a
   *                                         full backup.
   * @param  incrementalBaseID               The backup ID of the existing
   *                                         backup on which to base the
   *                                         incremental backup.  It may be
   *                                         {@code null} if this is not an
   *                                         incremental backup or if it should
   *                                         be based on the most recent backup.
   * @param  compress                        Indicates whether the backup should
   *                                         be compressed.
   * @param  encrypt                         Indicates whether the backup should
   *                                         be encrypted.
   * @param  encryptionPassphraseFile        The path to a file containing the
   *                                         passphrase to use to generate the
   *                                         encryption key.  It amy be
   *                                         {@code null} if the backup is not
   *                                         to be encrypted, or if the key
   *                                         should be obtained in some other
   *                                         way.
   * @param  encryptionSettingsDefinitionID  The ID of the encryption settings
   *                                         definition use to generate the
   *                                         encryption key.  It may be
   *                                         {@code null} if the backup is not
   *                                         to be encrypted, or if the key
   *                                         should be obtained in some other
   *                                         way.
   * @param  hash                            Indicates whether to generate a
   *                                         hash of the backup contents.
   * @param  signHash                        Indicates whether to sign the hash
   *                                         of the backup contents.
   * @param  maxMegabytesPerSecond           The maximum rate in megabytes per
   *                                         second at which the backup should
   *                                         be written.
   * @param  retainPreviousFullBackupCount   The minimum number of previous
   *                                         backups to retain.
   * @param  retainPreviousFullBackupAge     A string representation of the
   *                                         minimum age of previous backups to
   *                                         retain.  The age should be
   *                                         formatted in the same way as values
   *                                         for the {@link DurationArgument}
   *                                         class.
   * @param  scheduledStartTime              The time that this task should
   *                                         start running.
   * @param  dependencyIDs                   The list of task IDs that will be
   *                                         required to complete before this
   *                                         task will be eligible to start.
   * @param  failedDependencyAction          Indicates what action should be
   *                                         taken if any of the dependencies
   *                                         for this task do not complete
   *                                         successfully.
   * @param  notifyOnStart                   The list of e-mail addresses of
   *                                         individuals that should be notified
   *                                         when this task starts running.
   * @param  notifyOnCompletion              The list of e-mail addresses of
   *                                         individuals that should be notified
   *                                         when this task completes.
   * @param  notifyOnSuccess                 The list of e-mail addresses of
   *                                         individuals that should be notified
   *                                         if this task completes
   *                                         successfully.
   * @param  notifyOnError                   The list of e-mail addresses of
   *                                         individuals that should be notified
   *                                         if this task does not complete
   *                                         successfully.
   * @param  alertOnStart                    Indicates whether the server should
   *                                         send an alert notification when
   *                                         this task starts.
   * @param  alertOnSuccess                  Indicates whether the server should
   *                                         send an alert notification if this
   *                                         task completes successfully.
   * @param  alertOnError                    Indicates whether the server should
   *                                         send an alert notification if this
   *                                         task fails to complete
   *                                         successfully.
   */
  public BackupTask(@Nullable final String taskID,
              @NotNull final String backupDirectory,
              @Nullable final List backendIDs,
              @Nullable final String backupID,
              final boolean incremental,
              @Nullable final String incrementalBaseID,
              final boolean compress, final boolean encrypt,
              @Nullable final String encryptionPassphraseFile,
              @Nullable final String encryptionSettingsDefinitionID,
              final boolean hash, final boolean signHash,
              @Nullable final Integer maxMegabytesPerSecond,
              @Nullable final Integer retainPreviousFullBackupCount,
              @Nullable final String retainPreviousFullBackupAge,
              @Nullable final Date scheduledStartTime,
              @Nullable final List dependencyIDs,
              @Nullable final FailedDependencyAction failedDependencyAction,
              @Nullable final List notifyOnStart,
              @Nullable final List notifyOnCompletion,
              @Nullable final List notifyOnSuccess,
              @Nullable final List notifyOnError,
              @Nullable final Boolean alertOnStart,
              @Nullable final Boolean alertOnSuccess,
              @Nullable final Boolean alertOnError)
  {
    super(taskID, BACKUP_TASK_CLASS, scheduledStartTime,
         dependencyIDs, failedDependencyAction, notifyOnStart,
         notifyOnCompletion, notifyOnSuccess,  notifyOnError, alertOnStart,
         alertOnSuccess, alertOnError);

    Validator.ensureNotNull(backupDirectory);

    this.backupDirectory = backupDirectory;
    this.backupID = backupID;
    this.incremental = incremental;
    this.incrementalBaseID = incrementalBaseID;
    this.compress = compress;
    this.encrypt = encrypt;
    this.encryptionPassphraseFile = encryptionPassphraseFile;
    this.encryptionSettingsDefinitionID = encryptionSettingsDefinitionID;
    this.hash = hash;
    this.signHash = signHash;
    this.maxMegabytesPerSecond = maxMegabytesPerSecond;
    this.retainPreviousFullBackupCount = retainPreviousFullBackupCount;
    this.retainPreviousFullBackupAge = retainPreviousFullBackupAge;

    if (backendIDs == null)
    {
      this.backendIDs = Collections.emptyList();
    }
    else
    {
      this.backendIDs = Collections.unmodifiableList(backendIDs);
    }
  }



  /**
   * Creates a new backup task from the provided entry.
   *
   * @param  entry  The entry to use to create this backup task.
   *
   * @throws  TaskException  If the provided entry cannot be parsed as a backup
   *                         task entry.
   */
  public BackupTask(@NotNull final Entry entry)
         throws TaskException
  {
    super(entry);


    // Get the backup directory.  It must be present.
    backupDirectory = entry.getAttributeValue(ATTR_BACKUP_DIRECTORY);
    if (backupDirectory == null)
    {
      throw new TaskException(ERR_BACKUP_NO_BACKUP_DIRECTORY.get(
                                   getTaskEntryDN()));
    }


    // Get the set of backend IDs.  It may be absent.
    backendIDs = parseStringList(entry, ATTR_BACKEND_ID);


    // Get the backup ID.  It may be absent.
    backupID = entry.getAttributeValue(ATTR_BACKUP_ID);


    // Get the incremental flag.  It may be absent.
    incremental = parseBooleanValue(entry, ATTR_INCREMENTAL, false);


    // Get the incremental base ID.  It may be absent.
    incrementalBaseID = entry.getAttributeValue(ATTR_INCREMENTAL_BASE_ID);


    // Determine whether to compress the backup.  It may be absent.
    compress = parseBooleanValue(entry, ATTR_COMPRESS, false);


    // Determine whether to encrypt the backup.  It may be absent.
    encrypt = parseBooleanValue(entry, ATTR_ENCRYPT, false);


    // Get the path to the encryption passphrase file.  It may be absent.
    encryptionPassphraseFile =
         entry.getAttributeValue(ATTR_ENCRYPTION_PASSPHRASE_FILE);


    // Get the encryption settings definition ID.  It may be absent.
    encryptionSettingsDefinitionID =
         entry.getAttributeValue(ATTR_ENCRYPTION_SETTINGS_DEFINITION_ID);


    // Determine whether to hash the backup.  It may be absent.
    hash = parseBooleanValue(entry, ATTR_HASH, false);


    // Determine whether to sign the hash.  It may be absent.
    signHash = parseBooleanValue(entry, ATTR_SIGN_HASH, false);


    // Get the maximum write rate in megabytes per second.  It may be absent.
    maxMegabytesPerSecond =
         entry.getAttributeValueAsInteger(ATTR_MAX_MEGABYTES_PER_SECOND);


    // Get the retain previous full backup count.  It may be absent.
    retainPreviousFullBackupCount = entry.getAttributeValueAsInteger(
         ATTR_RETAIN_PREVIOUS_FULL_BACKUP_COUNT);


    // Get the retain previous full backup age.  It may be absent.
    retainPreviousFullBackupAge = entry.getAttributeValue(
         ATTR_RETAIN_PREVIOUS_FULL_BACKUP_AGE);
  }



  /**
   * Creates a new backup task from the provided set of task properties.
   *
   * @param  properties  The set of task properties and their corresponding
   *                     values to use for the task.  It must not be
   *                     {@code null}.
   *
   * @throws  TaskException  If the provided set of properties cannot be used to
   *                         create a valid backup task.
   */
  public BackupTask(@NotNull final Map> properties)
         throws TaskException
  {
    super(BACKUP_TASK_CLASS, properties);

    boolean  c           = false;
    boolean  e           = false;
    boolean  h           = false;
    boolean  i           = false;
    boolean  s           = false;
    Integer  maxMB       = null;
    Integer  retainCount = null;
    String   bDir        = null;
    String   bkID        = null;
    String   incID       = null;
    String   encID       = null;
    String   encPWFile   = null;
    String   retainAge   = null;
    String[] beIDs       = StaticUtils.NO_STRINGS;

    for (final Map.Entry> entry :
         properties.entrySet())
    {
      final TaskProperty p = entry.getKey();
      final String attrName = p.getAttributeName();
      final List values = entry.getValue();

      if (attrName.equalsIgnoreCase(ATTR_BACKUP_DIRECTORY))
      {
        bDir = parseString(p, values, bDir);
      }
      else if (attrName.equalsIgnoreCase(ATTR_BACKEND_ID))
      {
        beIDs = parseStrings(p, values, beIDs);
      }
      else if (attrName.equalsIgnoreCase(ATTR_BACKUP_ID))
      {
        bkID = parseString(p, values, bkID);
      }
      else if (attrName.equalsIgnoreCase(ATTR_INCREMENTAL))
      {
        i = parseBoolean(p, values, i);
      }
      else if (attrName.equalsIgnoreCase(ATTR_INCREMENTAL_BASE_ID))
      {
        incID = parseString(p, values, incID);
      }
      else if (attrName.equalsIgnoreCase(ATTR_COMPRESS))
      {
        c = parseBoolean(p, values, c);
      }
      else if (attrName.equalsIgnoreCase(ATTR_ENCRYPT))
      {
        e = parseBoolean(p, values, e);
      }
      else if (attrName.equalsIgnoreCase(ATTR_ENCRYPTION_PASSPHRASE_FILE))
      {
        encPWFile = parseString(p, values, encPWFile);
      }
      else if (attrName.equalsIgnoreCase(
           ATTR_ENCRYPTION_SETTINGS_DEFINITION_ID))
      {
        encID = parseString(p, values, encID);
      }
      else if (attrName.equalsIgnoreCase(ATTR_HASH))
      {
        h = parseBoolean(p, values, h);
      }
      else if (attrName.equalsIgnoreCase(ATTR_SIGN_HASH))
      {
        s = parseBoolean(p, values, s);
      }
      else if (attrName.equalsIgnoreCase(ATTR_MAX_MEGABYTES_PER_SECOND))
      {
        final Long maxMBLong = parseLong(p, values, null);
        if (maxMBLong == null)
        {
          maxMB = null;
        }
        else
        {
          maxMB = maxMBLong.intValue();
        }
      }
      else if (attrName.equalsIgnoreCase(
           ATTR_RETAIN_PREVIOUS_FULL_BACKUP_COUNT))
      {
        final Long retainCountLong = parseLong(p, values, null);
        if (retainCountLong == null)
        {
          retainCount = null;
        }
        else
        {
          retainCount = retainCountLong.intValue();
        }
      }
      else if (attrName.equalsIgnoreCase(ATTR_RETAIN_PREVIOUS_FULL_BACKUP_AGE))
      {
        retainAge = parseString(p, values, retainAge);
      }
    }

    if (bDir == null)
    {
      throw new TaskException(ERR_BACKUP_NO_BACKUP_DIRECTORY.get(
                                   getTaskEntryDN()));
    }

    backupDirectory = bDir;
    backendIDs = Arrays.asList(beIDs);
    backupID = bkID;
    incremental = i;
    incrementalBaseID = incID;
    compress = c;
    encrypt = e;
    encryptionPassphraseFile = encPWFile;
    encryptionSettingsDefinitionID = encID;
    hash = h;
    signHash = s;
    maxMegabytesPerSecond = maxMB;
    retainPreviousFullBackupCount = retainCount;
    retainPreviousFullBackupAge = retainAge;
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  @NotNull()
  public String getTaskName()
  {
    return INFO_TASK_NAME_BACKUP.get();
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  @NotNull()
  public String getTaskDescription()
  {
    return INFO_TASK_DESCRIPTION_BACKUP.get();
  }



  /**
   * Retrieves the path to the backup directory in which the backup files should
   * be written.  If a single backend is to be archived, then this will be the
   * directory in which the backup files are written.  If multiple backends are
   * to be archived, then this will be the parent of the directories containing
   * the backups for each backend.
   *
   * @return  The path to the backup directory in which the backup files should
   *          be written.
   */
  @NotNull()
  public String getBackupDirectory()
  {
    return backupDirectory;
  }



  /**
   * Indicates whether the server should back up all supported backends.
   *
   * @return  {@code true} if the server should back up all supported backends,
   *          or {@code false} if it should back up a specified backend or set
   *          of backends.
   */
  public boolean backupAll()
  {
    return backendIDs.isEmpty();
  }



  /**
   * Retrieves the set of backend IDs for the backends that should be archived.
   *
   * @return  The set of backend IDs for the backends that should be archived,
   *          or an empty list if the server should back up all supported
   *          backends.
   */
  @NotNull()
  public List getBackendIDs()
  {
    return backendIDs;
  }



  /**
   * Retrieves the backup ID for the backup to generate.
   *
   * @return  The backup ID for the backup to generate, or {@code null} if the
   *          server should generate a backup ID.
   */
  @Nullable()
  public String getBackupID()
  {
    return backupID;
  }



  /**
   * Indicates whether the server should attempt to perform an incremental
   * backup rather than a full backup.
   *
   * @return  {@code true} if the server should attempt to perform an
   *          incremental backup, or {@code false} for a full backup.
   */
  public boolean incremental()
  {
    return incremental;
  }



  /**
   * Retrieves the backup ID of the existing backup on which the incremental
   * backup should be based.
   *
   * @return  The backup ID of the existing backup on which the incremental
   *          backup should be based, or {@code null} if it is not an
   *          incremental backup or the server should use the most recent
   *          backup available as the base for the new incremental backup.
   */
  @Nullable()
  public String getIncrementalBaseID()
  {
    return incrementalBaseID;
  }



  /**
   * Indicates whether the backup should be compressed.
   *
   * @return  {@code true} if the backup should be compressed, or {@code false}
   *          if not.
   */
  public boolean compress()
  {
    return compress;
  }



  /**
   * Indicates whether the backup should be encrypted.
   *
   * @return  {@code true} if the backup should be encrypted, or {@code false}
   *          if not.
   */
  public boolean encrypt()
  {
    return encrypt;
  }



  /**
   * Retrieves the path to a file that contains the passphrase to use to
   * generate the encryption key.
   *
   * @return  The path to a file that contains the passphrase to use to
   *          generate the encryption key, or {@code null} if the backup should
   *          not be encrypted or if the encryption key should be obtained
   *          through some other means.
   */
  @Nullable()
  public String getEncryptionPassphraseFile()
  {
    return encryptionPassphraseFile;
  }



  /**
   * Retrieves the identifier of the encryption settings definition to use to
   * generate the encryption key.
   *
   * @return  The identifier of the encryption settings definition to use to
   *          generate the encryption key, or {@code null} if the backup should
   *          not be encrypted or if the encryption key should be obtained
   *          through some other means.
   */
  @Nullable()
  public String getEncryptionSettingsDefinitionID()
  {
    return encryptionSettingsDefinitionID;
  }



  /**
   * Indicates whether the server should generate a hash of the backup.
   *
   * @return  {@code true} if the server should generate a hash of the backup,
   *          or {@code false} if not.
   */
  public boolean hash()
  {
    return hash;
  }



  /**
   * Indicates whether the server should sign the backup hash.
   *
   * @return  {@code true} if the server should sign the backup hash, or
   *          {@code false} if not.
   */
  public boolean signHash()
  {
    return signHash;
  }



  /**
   * Retrieves the maximum rate, in megabytes per second, at which the backup
   * should be written.
   *
   * @return  The maximum rate, in megabytes per second, at which the backup
   *          should be written, or {@code null} if the writing should not be
   *          rate limited.
   */
  @Nullable()
  public Integer getMaxMegabytesPerSecond()
  {
    return maxMegabytesPerSecond;
  }



  /**
   * Retrieves the minimum number of previous full backups that should be
   * retained if the new backup is created successfully.
   *
   * @return  The minimum number of previous full backups that should be
   *          retained if the new backup is created successfully, or
   *          {@code null} if no backups should be removed or if the backup age
   *          should be the only retention criteria.
   */
  @Nullable()
  public Integer getRetainPreviousFullBackupCount()
  {
    return retainPreviousFullBackupCount;
  }



  /**
   * Retrieves a string representation of the minimum age of previous full
   * backups that should be retained if the new backup is created successfully.
   *
   * @return  A string representation fo the minimum age of previous full
   *          backups that should be retained if the new backup is created
   *          successfully, or {@code null} if no backups should be removed or
   *          if the backup count should be the only retention criteria.
   */
  @Nullable()
  public String getRetainPreviousFullBackupAge()
  {
    return retainPreviousFullBackupAge;
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  @NotNull()
  protected List getAdditionalObjectClasses()
  {
    return Collections.singletonList(OC_BACKUP_TASK);
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  @NotNull()
  protected List getAdditionalAttributes()
  {
    final ArrayList attrs = new ArrayList<>(20);

    attrs.add(new Attribute(ATTR_BACKUP_DIRECTORY, backupDirectory));
    attrs.add(new Attribute(ATTR_INCREMENTAL,  String.valueOf(incremental)));
    attrs.add(new Attribute(ATTR_COMPRESS, String.valueOf(compress)));
    attrs.add(new Attribute(ATTR_ENCRYPT, String.valueOf(encrypt)));
    attrs.add(new Attribute(ATTR_HASH, String.valueOf(hash)));
    attrs.add(new Attribute(ATTR_SIGN_HASH, String.valueOf(signHash)));

    if (backendIDs.isEmpty())
    {
      attrs.add(new Attribute(ATTR_BACKUP_ALL, "true"));
    }
    else
    {
      attrs.add(new Attribute(ATTR_BACKEND_ID, backendIDs));
    }

    if (backupID != null)
    {
      attrs.add(new Attribute(ATTR_BACKUP_ID, backupID));
    }

    if (incrementalBaseID != null)
    {
      attrs.add(new Attribute(ATTR_INCREMENTAL_BASE_ID, incrementalBaseID));
    }

    if (encryptionPassphraseFile != null)
    {
      attrs.add(new Attribute(ATTR_ENCRYPTION_PASSPHRASE_FILE,
           encryptionPassphraseFile));
    }

    if (encryptionSettingsDefinitionID != null)
    {
      attrs.add(new Attribute(ATTR_ENCRYPTION_SETTINGS_DEFINITION_ID,
           encryptionSettingsDefinitionID));
    }

    if (maxMegabytesPerSecond != null)
    {
      attrs.add(new Attribute(ATTR_MAX_MEGABYTES_PER_SECOND,
           String.valueOf(maxMegabytesPerSecond)));
    }

    if (retainPreviousFullBackupCount != null)
    {
      attrs.add(new Attribute(ATTR_RETAIN_PREVIOUS_FULL_BACKUP_COUNT,
           String.valueOf(retainPreviousFullBackupCount)));
    }

    if (retainPreviousFullBackupAge != null)
    {
      attrs.add(new Attribute(ATTR_RETAIN_PREVIOUS_FULL_BACKUP_AGE,
           retainPreviousFullBackupAge));
    }

    return attrs;
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  @NotNull()
  public List getTaskSpecificProperties()
  {
    final List propList = Arrays.asList(
         PROPERTY_BACKUP_DIRECTORY,
         PROPERTY_BACKEND_ID,
         PROPERTY_BACKUP_ID,
         PROPERTY_INCREMENTAL,
         PROPERTY_INCREMENTAL_BASE_ID,
         PROPERTY_COMPRESS,
         PROPERTY_ENCRYPT,
         PROPERTY_ENCRYPTION_PASSPHRASE_FILE,
         PROPERTY_ENCRYPTION_SETTINGS_DEFINITION_ID,
         PROPERTY_HASH,
         PROPERTY_SIGN_HASH,
         PROPERTY_MAX_MEGABYTES_PER_SECOND,
         PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_COUNT,
         PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_AGE);

    return Collections.unmodifiableList(propList);
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  @NotNull()
  public Map> getTaskPropertyValues()
  {
    final LinkedHashMap> props =
         new LinkedHashMap<>(StaticUtils.computeMapCapacity(20));

    props.put(PROPERTY_BACKUP_DIRECTORY,
         Collections.singletonList(backupDirectory));

    props.put(PROPERTY_BACKEND_ID,
              Collections.unmodifiableList(backendIDs));

    if (backupID == null)
    {
      props.put(PROPERTY_BACKUP_ID, Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_BACKUP_ID,
                Collections.singletonList(backupID));
    }

    props.put(PROPERTY_INCREMENTAL,
              Collections.singletonList(incremental));

    if (incrementalBaseID == null)
    {
      props.put(PROPERTY_INCREMENTAL_BASE_ID, Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_INCREMENTAL_BASE_ID,
                Collections.singletonList(incrementalBaseID));
    }

    props.put(PROPERTY_COMPRESS,
              Collections.singletonList(compress));

    props.put(PROPERTY_ENCRYPT,
              Collections.singletonList(encrypt));

    if (encryptionPassphraseFile == null)
    {
      props.put(PROPERTY_ENCRYPTION_PASSPHRASE_FILE, Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_ENCRYPTION_PASSPHRASE_FILE,
         Collections.singletonList(encryptionPassphraseFile));
    }

    if (encryptionSettingsDefinitionID == null)
    {
      props.put(PROPERTY_ENCRYPTION_SETTINGS_DEFINITION_ID,
           Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_ENCRYPTION_SETTINGS_DEFINITION_ID,
         Collections.singletonList(encryptionSettingsDefinitionID));
    }

    props.put(PROPERTY_HASH,
              Collections.singletonList(hash));

    props.put(PROPERTY_SIGN_HASH,
              Collections.singletonList(signHash));

    if (maxMegabytesPerSecond == null)
    {
      props.put(PROPERTY_MAX_MEGABYTES_PER_SECOND, Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_MAX_MEGABYTES_PER_SECOND,
         Collections.singletonList(maxMegabytesPerSecond.longValue()));
    }

    if (retainPreviousFullBackupCount == null)
    {
      props.put(PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_COUNT,
           Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_COUNT,
         Collections.singletonList(
              retainPreviousFullBackupCount.longValue()));
    }

    if (retainPreviousFullBackupAge == null)
    {
      props.put(PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_AGE,
           Collections.emptyList());
    }
    else
    {
      props.put(PROPERTY_RETAIN_PREVIOUS_FULL_BACKUP_AGE,
         Collections.singletonList(retainPreviousFullBackupAge));
    }

    props.putAll(super.getTaskPropertyValues());
    return Collections.unmodifiableMap(props);
  }
}
    

    

    

            

    

            



    
    






    
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