com.hp.hpl.jena.enhanced
Class Polymorphic

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

Direct Known Subclasses:

EnhGraph, EnhNode

public abstract class Polymorphic

extends java.lang.Object

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

Author:

Jeremy Carroll (original code)
Chris Dollin (original code)
Ian Dickinson (tidying up and comments)

Method Summary

void	addView(Polymorphic other) add another view for this object.
abstract boolean	equals(java.lang.Object o) subclasses must override equals.
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

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

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.

isValid

public abstract boolean isValid()

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

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).

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.