Package edu.caltech.nanodb.server

Enum CommandState

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<CommandState>
    public enum CommandState
extends java.lang.Enum<CommandState>
    An enumeration indicating the current command's execution status. It is used to implement a very simple communication protocol between the server and clients.

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      BEGIN_TUPLES
      This state value indicates that the command will be generating a sequence of tuples as the result of a query.
      COMMAND_COMPLETED
      This state value indicates that the command to be executed has been completed by the server.
      COMMAND_RECEIVED
      This state value indicates that the server has received the command sent by the client, and is proceeding to execute it.
      END_TUPLES
      This state value indicates that the command has generated all tuples it will generate.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private CommandState()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static CommandState valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static CommandState[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.

      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

    • Enum Constant Detail

      • COMMAND_RECEIVED

        public static final CommandState COMMAND_RECEIVED
        This state value indicates that the server has received the command sent by the client, and is proceeding to execute it.

      • BEGIN_TUPLES

        public static final CommandState BEGIN_TUPLES
        This state value indicates that the command will be generating a sequence of tuples as the result of a query.

      • END_TUPLES

        public static final CommandState END_TUPLES
        This state value indicates that the command has generated all tuples it will generate.

      • COMMAND_COMPLETED

        public static final CommandState COMMAND_COMPLETED
        This state value indicates that the command to be executed has been completed by the server.

    • Constructor Detail

      • CommandState

        private CommandState()

    • Method Detail

      • values

        public static CommandState[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (CommandState c : CommandState.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static CommandState valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null