Package net.ontopia.topicmaps.query.impl.basic

Class AbstractInstanceOfPredicate

java.lang.Object

net.ontopia.topicmaps.query.impl.basic.AbstractInstanceOfPredicate

All Implemented Interfaces:

BasicPredicateIF, PredicateIF

Direct Known Subclasses:

DirectInstanceOfPredicate, InstanceOfPredicate

public abstract class AbstractInstanceOfPredicate
extends Object
implements BasicPredicateIF

INTERNAL: Common superclass for the two instance-of predicates.

Field Summary

Fields

Modifier and Type	Field	Description
protected ClassInstanceIndexIF	index
protected TopicMapIF	topicmap

Constructor Summary

Constructors

Constructor	Description
AbstractInstanceOfPredicate(TopicMapIF topicmap)

Method Summary

Modifier and Type	Method	Description
protected abstract Collection	getClasses(TopicIF instance)	INTERNAL: Should return all applicable types of the given topic.
int	getCost(boolean[] boundparams)	INTERNAL.
protected Collection	getDirectInstances(TopicIF classes)	INTERNAL: Should return all instances of the topic, as seen by the specific predicate.
protected abstract Collection	getInstances(TopicIF klass)	INTERNAL: Should return all instances of the topic, as seen by the specific predicate.
String	getSignature()	INTERNAL: Returns a string representing the signature of the predicate.
protected abstract Collection	getSupertypes(TopicIF type)	INTERNAL: Should return all supertypes of the given class, including the class itself.
protected abstract Collection	getTypes()	INTERNAL: Should return all topic types, as seen by the specific predicate.
QueryMatches	satisfy(QueryMatches result, Object[] arguments)
protected abstract void	start()	INTERNAL: Called before the evaluation of a new query, to allow resetting of internal caches etc.

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.ontopia.topicmaps.query.parser.PredicateIF

getName

Field Detail

topicmap

protected TopicMapIF topicmap

index

protected ClassInstanceIndexIF index

Constructor Detail

AbstractInstanceOfPredicate

public AbstractInstanceOfPredicate(TopicMapIF topicmap)

Method Detail

getSignature

public String getSignature()

Description copied from interface: PredicateIF

INTERNAL: Returns a string representing the signature of the predicate. The string consists of a whitespace-separated list of arguments, where each argument is made up of tokens representing the type or cardinality of that argument.

The instance-of predicate would have a signature of "t t", while /= would have ". .", and in would have ". .+". For full details, see topicmaps.impl.utils.ArgumentValidator.

Specified by:

getSignature in interface PredicateIF

getCost

public int getCost(boolean[] boundparams)

Description copied from interface: PredicateIF

INTERNAL.

Specified by:

getCost in interface PredicateIF

satisfy

public QueryMatches satisfy(QueryMatches result,
                            Object[] arguments)
                     throws InvalidQueryException

Specified by:

satisfy in interface BasicPredicateIF

Throws:

InvalidQueryException

start

protected abstract void start()

INTERNAL: Called before the evaluation of a new query, to allow resetting of internal caches etc.

getClasses

protected abstract Collection getClasses(TopicIF instance)

INTERNAL: Should return all applicable types of the given topic. In 'instance-of' this includes the supertypes of the topic's types.

getInstances

protected abstract Collection getInstances(TopicIF klass)

INTERNAL: Should return all instances of the topic, as seen by the specific predicate.

getTypes

protected abstract Collection getTypes()

INTERNAL: Should return all topic types, as seen by the specific predicate.

getSupertypes

protected abstract Collection getSupertypes(TopicIF type)

INTERNAL: Should return all supertypes of the given class, including the class itself. In 'direct-instance-of' this should just be the class itself.

getDirectInstances

protected Collection getDirectInstances(TopicIF classes)

INTERNAL: Should return all instances of the topic, as seen by the specific predicate.