prolog.model
Interface IFactList

All Superinterfaces:

IFact

All Known Implementing Classes:

FactList

public interface IFactList

extends IFact

IFactList is the base interface for a collection of relations. It can be compared with a database table containing rows of relations. The name of the factlist would be the tablename. That's why factlist extends IFact. So it inherits a name. The relation of the extended IFact are also used for factlists returned by queries. In this relation, parameters of the statements are stored.

prolog:

myFact(joe,dan).

myFact(joe,dan2).

In this example, the two facts "myFact" are stored in a factlist.

interpreter internal:

myFact(joe,dan).

myFact(joe,dan2).

myStatement(X,Y):-myFact(X,Y).

In this example, the results returned by myFact(X,Y) are stored in a factlist.

Copyright: Copyright (c) 2002

Organisation:

Method Summary

void	addRelation(IRelation atoms) adds a relation to this fact list
int	getColCount()
IFactList	getCopy()
IFactList	getMatchings(IFact fact)
java.util.Iterator	getRelations()
int	getRowCount()
void	setRelation(IRelation r) sets the relation

Methods inherited from interface prolog.model.IFact

genXml, getName, getRelation, toString

Method Detail

getColCount

public int getColCount()

Returns:

the number of atoms stored in a relation in this factlist

getRowCount

public int getRowCount()

Returns:

the number of relations in this factlist

addRelation

public void addRelation(IRelation atoms)

adds a relation to this fact list

Parameters:

atoms - to be added

getRelations

public java.util.Iterator getRelations()

Returns:

a iterator over all relations

setRelation

public void setRelation(IRelation r)

sets the relation

getMatchings

public IFactList getMatchings(IFact fact)
                       throws ParameterMatchingError

Parameters:

fact - the search pattern

Returns:

a collection of all relations matching the found relation in the given fact

getCopy

public IFactList getCopy()

Returns:

a copy of this fact list