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

Enum ExpressionType

java.lang.Object

java.lang.Enum<ExpressionType>

org.apache.iotdb.tsfile.read.expression.ExpressionType

All Implemented Interfaces:

Serializable, Comparable<ExpressionType>

public enum ExpressionType
extends 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

Modifier and Type	Method	Description
static ExpressionType	valueOf(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(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:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null