org.apache.drill.exec.physical.impl.protocol

Enum OperatorDriver.State

java.lang.Object

java.lang.Enum<OperatorDriver.State>

org.apache.drill.exec.physical.impl.protocol.OperatorDriver.State

All Implemented Interfaces:

Serializable, Comparable<OperatorDriver.State>

Enclosing class:

OperatorDriver

public static enum OperatorDriver.State
extends Enum<OperatorDriver.State>

Enum Constant Summary

Enum Constants

Enum Constant and Description
CANCELED Operation was cancelled.
CLOSED close() called and resources are released.
END No more data to deliver.
FAILED An error occurred.
RUN Read from readers.
START Before the first call to next().
STARTING Attempting to start the operator.

Method Summary

Modifier and Type	Method and Description
static OperatorDriver.State	valueOf(String name) Returns the enum constant of this type with the specified name.
static OperatorDriver.State[]	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

START

public static final OperatorDriver.State START

Before the first call to next().

STARTING

public static final OperatorDriver.State STARTING

Attempting to start the operator.

RUN

public static final OperatorDriver.State RUN

Read from readers.

END

public static final OperatorDriver.State END

No more data to deliver.

FAILED

public static final OperatorDriver.State FAILED

An error occurred.

CANCELED

public static final OperatorDriver.State CANCELED

Operation was cancelled. No more batches will be returned, but close() has not yet been called.

CLOSED

public static final OperatorDriver.State CLOSED

close() called and resources are released. No more batches will be returned, but close() has not yet been called. (This state is semantically identical to FAILED, it exists just in case an implementation needs to know the difference between the END, FAILED and CANCELED states.)

Method Detail

values

public static OperatorDriver.State[] 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 (OperatorDriver.State c : OperatorDriver.State.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static OperatorDriver.State 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