| java.lang.Object
 com.hp.hpl.jena.util.ResourceUtils
| ResourceUtils | | public class ResourceUtils (Code) | |
General utility methods that operate on RDF resources, but which are not specific
to a given model.
author:
Ian Dickinson, HP Labs
author:
(email)
version:
CVS $Id: ResourceUtils.java,v 1.16 2008/01/02 12:07:44 andy_seaborne Exp $ |
| Method Summary | |
| public static List | maximalLowerElements(Collection resources, Property rel, boolean inverse)
Answer the maximal lower elements of the given collection, given the partial
ordering rel. | | public static List | maximalLowerElements(Iterator resources, Property rel, boolean inverse)
Given a collection of resources, and a relation defining a partial order over
those resources, answer the sub-collection that contains only those elements
that appear in the maximal generator of the relation. | | public static List | partition(List l, Property p)
Answer a list of lists, which is a partition of the given
input list of resources. | | public static Model | reachableClosure(Resource root)
Answer a model that contains all of the resources reachable from a given
resource by any property, transitively. | | public static List | removeEquiv(List l, Property p, Resource ref)
Remove from the given list l of
Resource Resources , any Resource that is equivalent
to the reference resource ref under the relation p. | | public static Resource | renameResource(Resource old, String uri)
Answer a new resource that occupies the same position in the graph as the current
resource old, but that has the given URI. |
| maximalLowerElements | | public static List maximalLowerElements(Collection resources, Property rel, boolean inverse)(Code) | |
Answer the maximal lower elements of the given collection, given the partial
ordering rel. See
ResourceUtils.maximalLowerElements(Iterator,Property,boolean) for details.
Parameters:
resources - A collection of resources
Parameters:
rel - A property defining a partial-ordering on resources
Parameters:
inverse - If true, we invert the given property (by reversing the orderof the arguments), which allows us to use eg subClassOf as a partial order operator for both sub-class and super-class relationships The collection that contains only those resources are notgreater than another resource under the partial order. |
| maximalLowerElements | | public static List maximalLowerElements(Iterator resources, Property rel, boolean inverse)(Code) | |
Given a collection of resources, and a relation defining a partial order over
those resources, answer the sub-collection that contains only those elements
that appear in the maximal generator of the relation. Specifically, a resource
x is excluded from the return value if there is another resource
y in the input collection such that y Rel x holds.
Parameters:
resources - An iterator over a collection of resources
Parameters:
rel - A property defining a partial-ordering on resources
Parameters:
inverse - If true, we invert the given property (by reversing the orderof the arguments), which allows us to use eg subClassOf as a partial order operator for both sub-class and super-class relationships The list that contains only those resources are notgreater than another resource under the partial order. |
| partition | | public static List partition(List l, Property p)(Code) | | Answer a list of lists, which is a partition of the given
input list of resources. The equivalence relation is the predicate p.
So, two resources a and b
will be in the same partition iff
(a p b) && (b p a).
Parameters:
l - A list of resources
Parameters:
p - An equivalence predicate A list of lists which are the partitions of l under p |
| reachableClosure | | public static Model reachableClosure(Resource root)(Code) | | Answer a model that contains all of the resources reachable from a given
resource by any property, transitively. The returned graph is the sub-graph
of the parent graph of root, whose root node is the given root. Cycles are
permitted in the sub-graph.
Parameters:
root - The root node of the sub-graph to extract A model containing all reachable RDFNodes from root by any property. |
| removeEquiv | | public static List removeEquiv(List l, Property p, Resource ref)(Code) | | Remove from the given list l of
Resource Resources , any Resource that is equivalent
to the reference resource ref under the relation p. Typically,
p will be owl:subClassOf or owl:subPropertyOf
or some similar predicate. A resource R is defined to be equivalent to ref
iff R p ref is true and ref p R is true.
The equivalent resources are removed from list l
in place, the return value is the list of removed resources.
Parameters:
l - A list of resources from which the resources equivalent to ref will be removed
Parameters:
p - An equivalence predicate
Parameters:
ref - A reference resource A list of the resources removed from the parameter list l |
| renameResource | | public static Resource renameResource(Resource old, String uri)(Code) | | Answer a new resource that occupies the same position in the graph as the current
resource old, but that has the given URI. In the process, the existing
statements referring to old are removed. Since Jena does not allow the
identity of a resource to change, this is the closest approximation to a rename operation
that works.
Notes: This method does minimal checking, so renaming a resource
to its own URI is unpredictable. Furthermore, it is a general and simple approach, and
in given applications it may be possible to do this operation more efficiently. Finally,
if res is a property, existing statements that use the property will not
be renamed, nor will occurrences of res in other models.
Parameters:
old - An existing resource in a given model
Parameters:
uri - A new URI for resource old, or null to rename old to a bNode A new resource that occupies the same position in the graph as old, but whichhas the new given URI. |
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