Package org.tweetyproject.lp.asp.syntax

Enum ASPOperator.AggregateFunction

java.lang.Object

java.lang.Enum<ASPOperator.AggregateFunction>

org.tweetyproject.lp.asp.syntax.ASPOperator.AggregateFunction

All Implemented Interfaces:

Serializable, Comparable<ASPOperator.AggregateFunction>, Constable

Enclosing class:

ASPOperator

public static enum ASPOperator.AggregateFunction
extends Enum<ASPOperator.AggregateFunction>

The following aggregate functions are supported by the ASP-Core-2 standard and by Tweety. 'weight' in this context is the first element of an aggregate element (term tuple).
- #count: Number of elements, used to represent cardinality constraints.
- #sum: Sum of weights, used to represent weight constraints.
- #max: Maximum weight
- #min: Minimum weight
Clingo additionally includes the #sum+ aggregate function, which represents the sum of positive weights.
DLV additionally includes the #times aggregate function. #times is similar to #sum, but computes the product of the first local variable to be aggregated over in the symbolic set. For the empty set, #times returns 1.

Author:

Anna Gessler

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
COUNT	Counts the number of elements.
MAX	Finds the maximum value among the elements.
MIN	Finds the minimum value among the elements.
SUM	Calculates the sum of the elements.
SUM_PLUS	Calculates the sum, treating all elements as positive values.
TIMES	Calculates the product of the elements.

Method Summary

Modifier and Type	Method	Description
String	toString()
static ASPOperator.AggregateFunction	valueOf(String name)	Returns the enum constant of this type with the specified name.
static ASPOperator.AggregateFunction[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, describeConstable, equals, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

COUNT

public static final ASPOperator.AggregateFunction COUNT

Counts the number of elements.

MAX

public static final ASPOperator.AggregateFunction MAX

Finds the maximum value among the elements.

MIN

public static final ASPOperator.AggregateFunction MIN

Finds the minimum value among the elements.

SUM

public static final ASPOperator.AggregateFunction SUM

Calculates the sum of the elements.

SUM_PLUS

public static final ASPOperator.AggregateFunction SUM_PLUS

Calculates the sum, treating all elements as positive values.

TIMES

public static final ASPOperator.AggregateFunction TIMES

Calculates the product of the elements.

Method Details

values

public static ASPOperator.AggregateFunction[] values()

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

Returns:

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

valueOf

public static ASPOperator.AggregateFunction 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

toString

public String toString()

Overrides:

toString in class Enum<ASPOperator.AggregateFunction>