Package org.apache.calcite.rel.metadata

Enum NullSentinel

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<NullSentinel>
    public enum NullSentinel
extends java.lang.Enum<NullSentinel>
    Placeholder for null values.

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      ACTIVE
      Placeholder that means that a request for metadata is already active, therefore this request forms a cycle.
      INSTANCE
      Placeholder for a null value.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private NullSentinel()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.Comparable mask​(java.lang.Comparable value)  
      static java.lang.Object mask​(java.lang.Object value)  
      static NullSentinel valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static NullSentinel[] 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

      • INSTANCE

        public static final NullSentinel INSTANCE
        Placeholder for a null value.

      • ACTIVE

        public static final NullSentinel ACTIVE
        Placeholder that means that a request for metadata is already active, therefore this request forms a cycle.

    • Constructor Detail

      • NullSentinel

        private NullSentinel()

    • Method Detail

      • values

        public static NullSentinel[] 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 (NullSentinel c : NullSentinel.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static NullSentinel 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

      • mask

        public static java.lang.Comparable mask​(java.lang.Comparable value)

      • mask

        public static java.lang.Object mask​(java.lang.Object value)