Package org.apache.iotdb.tsfile.read.expression

Enum ExpressionType

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<ExpressionType>
    public enum ExpressionType
extends java.lang.Enum<ExpressionType>

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      AND
      Represent the relationship between the left expression and the right expression is AND
      GLOBAL_TIME
      Represents that the expression is a leaf node in the expression tree and the type is time filtering
      OR
      Represent the relationship between the left expression and the right expression is OR
      SERIES
      Represents that the expression is a leaf node in the expression tree and the type is value filtering
      TRUE
      This type is used in the pruning process of expression tree in the distributed reading process.

    • Method Summary

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

      • AND

        public static final ExpressionType AND
        Represent the relationship between the left expression and the right expression is AND

      • OR

        public static final ExpressionType OR
        Represent the relationship between the left expression and the right expression is OR

      • SERIES

        public static final ExpressionType SERIES
        Represents that the expression is a leaf node in the expression tree and the type is value filtering

      • GLOBAL_TIME

        public static final ExpressionType GLOBAL_TIME
        Represents that the expression is a leaf node in the expression tree and the type is time filtering

      • TRUE

        public static final ExpressionType TRUE
        This type is used in the pruning process of expression tree in the distributed reading process. When pruning a expression tree for a data group, leaf nodes belonging to other data groups will be set to that type.

    • Method Detail

      • values

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

      • valueOf

        public static ExpressionType 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