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com.hp.hpl.jena.enhanced
Class Polymorphic  

java.lang.Object
  com.hp.hpl.jena.enhanced.Polymorphic

Direct Known Subclasses:

EnhGraph, EnhNode

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public abstract class Polymorphic

extends java.lang.Object

Abstract base class for all polymorphic RDF objects, especially enhanced node and enhanced graph.

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Field Summary
private  Polymorphic	ring           Each new polymorphic object is in a ring of views

 

Constructor Summary
(package private)	Polymorphic()           initially we're in the singleton ring.

 

Method Summary
void	addView(Polymorphic other)           add another view for this object.
protected  boolean	already(java.lang.Class t)           Answer true iff this is already acceptable to the given type t.
protected  Polymorphic	asInternal(java.lang.Class t)           Answer a polymorphic object that presents this in a way which satisfies type t.
protected abstract  boolean	canSupport(java.lang.Class t)           subclasses must provide a method for testing if _this_ can be converted to an instance of _t_.
protected abstract  Polymorphic	convertTo(java.lang.Class t)           subclasses must provide a method for converting _this_, if possible, into an instance of _t_.
abstract  boolean	equals(java.lang.Object o)           subclasses must override equals.
private  Polymorphic	findExistingView(java.lang.Class t)           find an existing view in the ring which is an instance of _t_ and return it; otherwise return null.
protected abstract  Personality	getPersonality()           Answer the personality object bound to this polymorphic instance
abstract  boolean	isValid()           answer true iff this enhanced node is still underpinned in the graph by triples appropriate to its type.
boolean	supports(java.lang.Class t)           return _true_ iff this polymorphic object supports the specified interface.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

ring

private Polymorphic ring

Each new polymorphic object is in a ring of views

Constructor Detail

Polymorphic

Polymorphic()

initially we're in the singleton ring.

Method Detail

getPersonality

protected abstract Personality getPersonality()

Answer the personality object bound to this polymorphic instance

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already

protected boolean already(java.lang.Class t)

Answer true iff this is already acceptable to the given type t. Delegates to t to test if this class is an acceptable implementation.

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supports

public boolean supports(java.lang.Class t)

return _true_ iff this polymorphic object supports the specified interface. Synonymous with "does the argument class have this as an instance". Actually it shouldn't be. Review.

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asInternal

protected final Polymorphic asInternal(java.lang.Class t)

Answer a polymorphic object that presents this in a way which satisfies type t.

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findExistingView

private Polymorphic findExistingView(java.lang.Class t)

find an existing view in the ring which is an instance of _t_ and return it; otherwise return null. If _this_ is an instance, the search takes care to find it first.

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isValid

public abstract boolean isValid()

answer true iff this enhanced node is still underpinned in the graph by triples appropriate to its type.

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convertTo

protected abstract Polymorphic convertTo(java.lang.Class t)

subclasses must provide a method for converting _this_, if possible, into an instance of _t_. It will only be called if _this_ doesn't already have (or be) a suitable ring-sibling.

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canSupport

protected abstract boolean canSupport(java.lang.Class t)

subclasses must provide a method for testing if _this_ can be converted to an instance of _t_.

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equals

public abstract boolean equals(java.lang.Object o)

subclasses must override equals. Actually they may not have to nowadays ... I have expunged the clever facet-identity test (and indeed facets).

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addView

public void addView(Polymorphic other)

add another view for this object. other must be freshly constructed. To be called by subclasses when they have constructed a new view for this object. This method is public ONLY so that it can be tested. TODO find a better way to make it testable.

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Home >> All >> com >> hp >> hpl >> jena >> [ enhanced overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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