uk.org.ogsadai.dqp.lqp
Class OperatorID

java.lang.Object
  uk.org.ogsadai.dqp.lqp.OperatorID

public class OperatorID
extends java.lang.Object

Operator Identifier. This class is also a factory for OperatorID classes. The only way to create a new OperatorID class is by calling the getInstance(String id) method. This class ensures that there is only one OperatorID object for unique id.

Author:

The OGSA-DAI Project Team.

Field Summary

static OperatorID	ANTI_SEMI_JOIN
static OperatorID	APPLY
static OperatorID	BINARY_REL_FUNCTION
static OperatorID	DIFFERENCE
static OperatorID	DUPLICATE_ELIMINATION
static OperatorID	EXCHANGE
static OperatorID	FILTERED_TABLE_SCAN
static OperatorID	FULL_OUTER_JOIN
static OperatorID	GROUP_BY
static OperatorID	INNER_THETA_JOIN
static OperatorID	INTERSECTION
static OperatorID	LEFT_OUTER_JOIN
static OperatorID	LIMIT
static OperatorID	NIL Helper operators - should not appear in the final LQP.
static OperatorID	ONE_ROW_ONLY
static OperatorID	PRODUCT Binary operators.
static OperatorID	PROJECT
static OperatorID	PULL_EXCHANGE_CONSUMER ID for PULL EXCHANGE CONSUMER.
static OperatorID	PULL_EXCHANGE_PRODUCER ID for PULL EXCHANGE PRODCUER.
static OperatorID	PUSH_EXCHANGE_CONSUMER ID for PUSH EXCHANGE CONSUMER.
static OperatorID	PUSH_EXCHANGE_PRODUCER ID for PUSH EXCHANGE PRODUCER.
static OperatorID	QUERY_APPLY
static OperatorID	RENAME
static OperatorID	RIGHT_OUTER_JOIN
static OperatorID	SCALAR_GROUP_BY
static OperatorID	SCAN_BIND_APPLY
static OperatorID	SCAN_REL_FUNCTION
static OperatorID	SELECT Unary operators.
static OperatorID	SEMI_JOIN
static OperatorID	SORT
static OperatorID	TABLE_SCAN
static OperatorID	UNARY_REL_FUNCTION Rel functions
static OperatorID	UNION

Method Summary

boolean	equals(java.lang.Object obj) Two OperatorIDs are equal when their string representations are equal.
static OperatorID	getInstance(java.lang.String id) Creates a new instance of the OperatorID class identified by a given id or returns previously created instance.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

SELECT

public static final OperatorID SELECT

Unary operators.

PROJECT

public static final OperatorID PROJECT

RENAME

public static final OperatorID RENAME

DUPLICATE_ELIMINATION

public static final OperatorID DUPLICATE_ELIMINATION

LIMIT

public static final OperatorID LIMIT

SORT

public static final OperatorID SORT

TABLE_SCAN

public static final OperatorID TABLE_SCAN

FILTERED_TABLE_SCAN

public static final OperatorID FILTERED_TABLE_SCAN

GROUP_BY

public static final OperatorID GROUP_BY

ONE_ROW_ONLY

public static final OperatorID ONE_ROW_ONLY

SCALAR_GROUP_BY

public static final OperatorID SCALAR_GROUP_BY

PULL_EXCHANGE_CONSUMER

public static final OperatorID PULL_EXCHANGE_CONSUMER

ID for PULL EXCHANGE CONSUMER.

PULL_EXCHANGE_PRODUCER

public static final OperatorID PULL_EXCHANGE_PRODUCER

ID for PULL EXCHANGE PRODCUER.

PUSH_EXCHANGE_CONSUMER

public static final OperatorID PUSH_EXCHANGE_CONSUMER

ID for PUSH EXCHANGE CONSUMER.

PUSH_EXCHANGE_PRODUCER

public static final OperatorID PUSH_EXCHANGE_PRODUCER

ID for PUSH EXCHANGE PRODUCER.

EXCHANGE

public static final OperatorID EXCHANGE

PRODUCT

public static final OperatorID PRODUCT

Binary operators.

INNER_THETA_JOIN

public static final OperatorID INNER_THETA_JOIN

FULL_OUTER_JOIN

public static final OperatorID FULL_OUTER_JOIN

RIGHT_OUTER_JOIN

public static final OperatorID RIGHT_OUTER_JOIN

LEFT_OUTER_JOIN

public static final OperatorID LEFT_OUTER_JOIN

SEMI_JOIN

public static final OperatorID SEMI_JOIN

ANTI_SEMI_JOIN

public static final OperatorID ANTI_SEMI_JOIN

APPLY

public static final OperatorID APPLY

QUERY_APPLY

public static final OperatorID QUERY_APPLY

SCAN_BIND_APPLY

public static final OperatorID SCAN_BIND_APPLY

UNION

public static final OperatorID UNION

INTERSECTION

public static final OperatorID INTERSECTION

DIFFERENCE

public static final OperatorID DIFFERENCE

NIL

public static final OperatorID NIL

Helper operators - should not appear in the final LQP.

UNARY_REL_FUNCTION

public static final OperatorID UNARY_REL_FUNCTION

Rel functions

BINARY_REL_FUNCTION

public static final OperatorID BINARY_REL_FUNCTION

SCAN_REL_FUNCTION

public static final OperatorID SCAN_REL_FUNCTION

Method Detail

getInstance

public static OperatorID getInstance(java.lang.String id)

Creates a new instance of the OperatorID class identified by a given id or returns previously created instance.

Parameters:

id - operator id string

Returns:

OperatorID instance

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Two OperatorIDs are equal when their string representations are equal.

Overrides:

equals in class java.lang.Object