org.hypergraphdb.query

Class ArityCondition

java.lang.Object

org.hypergraphdb.query.ArityCondition

All Implemented Interfaces:

HGAtomPredicate, HGQueryCondition

public class ArityCondition
extends Object
implements HGQueryCondition, HGAtomPredicate

The ArityCondition is a simply predicate condition that checks the arity (i.e. the size of a target set) of its argument. A link is an atom whose target set has an arity > 0. Thus to check whether an atom is a link, one can use the condition new Not(new ArityCondition(0)).

Author:

Borislav Iordanov

Constructor Summary

Constructors

Constructor and Description
ArityCondition()
ArityCondition(int arity)
ArityCondition(Ref<Integer> arity)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object x)
int	getArity()
Ref<Integer>	getArityReference()
int	hashCode()
boolean	satisfies(HyperGraph hg, HGHandle handle) Return true if handle to a HyperGraph link and false if it refers to a HyperGraph node.
void	setArity(int arity)
void	setArityReference(Ref<Integer> arity)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ArityCondition

public ArityCondition()

ArityCondition

public ArityCondition(int arity)

ArityCondition

public ArityCondition(Ref<Integer> arity)

Method Detail

satisfies

public boolean satisfies(HyperGraph hg,
                HGHandle handle)

Return true if handle to a HyperGraph link and false if it refers to a HyperGraph node.

Specified by:

satisfies in interface HGAtomPredicate

Parameters:

hg - The HyperGraph instance.

handle - The atom on which to test the query condition.

Returns:

true if the passed in parameter satisfies the condition and false otherwise.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object x)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

getArity

public int getArity()

setArity

public void setArity(int arity)

getArityReference

public Ref<Integer> getArityReference()

setArityReference

public void setArityReference(Ref<Integer> arity)