org.projog.core.term

Enum TermType

java.lang.Object

java.lang.Enum<TermType>

org.projog.core.term.TermType

All Implemented Interfaces:

Serializable, Comparable<TermType>

public enum TermType
extends Enum<TermType>

Defines the type of terms supported by Projog.

See Also:

Term.getType()

Enum Constant Summary

Enum Constants

Enum Constant and Description
ATOM
CLP_VARIABLE Constraint Logic Programming variable
EMPTY_LIST
FRACTION
INTEGER
LIST
STRUCTURE
VARIABLE

Method Summary

Modifier and Type	Method and Description
int	getPrecedence() Used to consistently order Terms of different types.
boolean	isNumeric()
boolean	isStructure()
boolean	isVariable()
static TermType	valueOf(String name) Returns the enum constant of this type with the specified name.
static TermType[]	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

VARIABLE

public static final TermType VARIABLE

See Also:

Variable

CLP_VARIABLE

public static final TermType CLP_VARIABLE

Constraint Logic Programming variable

FRACTION

public static final TermType FRACTION

See Also:

DecimalFraction

INTEGER

public static final TermType INTEGER

See Also:

IntegerNumber

EMPTY_LIST

public static final TermType EMPTY_LIST

See Also:

EmptyList

ATOM

public static final TermType ATOM

See Also:

Atom

STRUCTURE

public static final TermType STRUCTURE

See Also:

Structure

LIST

public static final TermType LIST

See Also:

List

Method Detail

values

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

Returns:

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

valueOf

public static TermType 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

isStructure

public boolean isStructure()

Returns:

true if this type represents "compound structure"

isNumeric

public boolean isNumeric()

Returns:

true if this type represents instances of Numeric

isVariable

public boolean isVariable()

Returns:

true if this type represents a variable

getPrecedence

public int getPrecedence()

Used to consistently order Terms of different types.

Returns:

precedence of this type

See Also:

TermComparator.compare(Term, Term)