net.ontopia.topicmaps.query.parser
Class PredicateClause

java.lang.Object
  net.ontopia.topicmaps.query.parser.AbstractClause
      net.ontopia.topicmaps.query.parser.PredicateClause

Direct Known Subclasses:

QueryOptimizer.PumpClause

public class PredicateClause
extends AbstractClause

INTERNAL: Used to represent clauses in tolog queries.

Field Summary

protected List	arguments
protected PredicateIF	predicate

Constructor Summary

PredicateClause()

PredicateClause(PredicateIF predicate)

PredicateClause(PredicateIF predicate, List arguments)

Method Summary

void	addArgument(Object object)
Collection	getAllLiterals() INTERNAL: Returns all the literals used by this clause as parameters.
Collection	getAllVariables() INTERNAL: Returns all the variables bound by this clause when it is satisfied.
List	getArguments() INTERNAL: Returns the arguments of this clause.
PredicateIF	getPredicate()
PredicateClause	getReplacement() INTERNAL: Returns an equivalent, but more efficient, clause, if such a clause is possible; if not returns itself.
void	setPredicate(PredicateIF predicate)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

predicate

protected PredicateIF predicate

arguments

protected List arguments

Constructor Detail

PredicateClause

public PredicateClause()

PredicateClause

public PredicateClause(PredicateIF predicate)

PredicateClause

public PredicateClause(PredicateIF predicate,
                       List arguments)

Method Detail

getArguments

public List getArguments()

Description copied from class: AbstractClause

INTERNAL: Returns the arguments of this clause. For OrClause this is the list of all arguments to all the subclauses in the OrClause. Likewise for NotClause.

Specified by:

getArguments in class AbstractClause

getPredicate

public PredicateIF getPredicate()

setPredicate

public void setPredicate(PredicateIF predicate)

addArgument

public void addArgument(Object object)

toString

public String toString()

Overrides:

toString in class Object

getAllVariables

public Collection getAllVariables()

Description copied from class: AbstractClause

INTERNAL: Returns all the variables bound by this clause when it is satisfied.

Specified by:

getAllVariables in class AbstractClause

getAllLiterals

public Collection getAllLiterals()

Description copied from class: AbstractClause

INTERNAL: Returns all the literals used by this clause as parameters. (Literals in the second half of pair arguments are ignored.)

Specified by:

getAllLiterals in class AbstractClause

getReplacement

public PredicateClause getReplacement()

INTERNAL: Returns an equivalent, but more efficient, clause, if such a clause is possible; if not returns itself. Used by the optimizer to optimize queries.