Package org.apache.jena.enhanced
Class Polymorphic<T>
- java.lang.Object
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- org.apache.jena.enhanced.Polymorphic<T>
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- Direct Known Subclasses:
EnhNode
public abstract class Polymorphic<T> extends java.lang.Object
Abstract base class for all polymorphic RDF objects, especially enhanced node and enhanced graph.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description void
addView(Polymorphic<T> 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.<X extends T>
booleansupports(java.lang.Class<X> t)
return _true_ iff this polymorphic object supports the specified interface.
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Method Detail
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supports
public <X extends T> boolean supports(java.lang.Class<X> 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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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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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).- Overrides:
equals
in classjava.lang.Object
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addView
public void addView(Polymorphic<T> 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.The method is synchronised because addView is an update operation that may happen in a read context (because of .as()). Synchronising it ensures that simultaneous updates don't end up leaving the rings in an inconsistent state. (It's not clear whether this would actually lead to any problems; it's hard to write tests to expose these issues.) This method is public ONLY so that it can be tested. TODO find a better way to make it testable.
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