Package org.projog.core.math

Class NumericTermComparator

java.lang.Object

org.projog.core.math.NumericTermComparator

public final class NumericTermComparator
extends java.lang.Object

Provides methods for comparing instances of Numeric.

See Also:

compare(Term, Term, ArithmeticOperators), TermComparator

Field Summary

Fields

Modifier and Type	Field	Description
static NumericTermComparator	NUMERIC_TERM_COMPARATOR	Singleton instance

Constructor Summary

Constructors

Modifier	Constructor	Description
private	NumericTermComparator()	Private constructor to force use of NUMERIC_TERM_COMPARATOR

Method Summary

Modifier and Type	Method	Description
int	compare(Numeric n1, Numeric n2)	Compares two arguments, representing Numeric terms, for order.
int	compare(Term t1, Term t2, ArithmeticOperators operators)	Compares the two arguments, representing arithmetic expressions, for order.

Methods inherited from class java.lang.Object

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

Field Detail

NUMERIC_TERM_COMPARATOR

public static final NumericTermComparator NUMERIC_TERM_COMPARATOR

Singleton instance

Constructor Detail

NumericTermComparator

private NumericTermComparator()

Private constructor to force use of NUMERIC_TERM_COMPARATOR

Method Detail

compare

public int compare(Term t1,
                   Term t2,
                   ArithmeticOperators operators)

Compares the two arguments, representing arithmetic expressions, for order.

Returns a negative integer, zero, or a positive integer as the numeric value represented by the first argument is less than, equal to, or greater than the second.

Unlike compare(Numeric, Numeric) this method will work for arguments that represent arithmetic expressions (e.g. a Structure of the form +(1,2)) as well as Numeric terms.

Parameters:

t1 - the first term to be compared

t2 - the second term to be compared

Returns:

a negative integer, zero, or a positive integer as the first term is less than, equal to, or greater than the second

Throws:

ProjogException - if either argument does not represent an arithmetic expression

See Also:

compare(Numeric, Numeric), ArithmeticOperators.getNumeric(Term)

compare

public int compare(Numeric n1,
                   Numeric n2)

Compares two arguments, representing Numeric terms, for order.

Returns a negative integer, zero, or a positive integer as the numeric value represented by the first argument is less than, equal to, or greater than the second.

Parameters:

n1 - the first term to be compared

n2 - the second term to be compared

Returns:

a negative integer, zero, or a positive integer as the first term is less than, equal to, or greater than the second

See Also:

compare(Term, Term, ArithmeticOperators)