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// * * | |
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// * * | |
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// *************************************************************************************************************************** | |
package org.apache.juneau.jena; | |
import java.util.*; | |
import org.apache.juneau.*; | |
import org.apache.juneau.jena.annotation.*; | |
import org.apache.juneau.xml.*; | |
/** | |
* Utility classes. | |
*/ | |
public class RdfUtils { | |
/** | |
* Find the namespace given a list of <ja>@Rdf</ja> and <ja>@RdfSchema</ja> annotations. | |
* | |
* <p> | |
* The annotations should be a child-to-parent ordering of annotations found on a class or method. | |
* | |
* @param rdfs The <c>@Rdf</c> annotations to search. | |
* @param schemas The list of known RDF schemas. | |
* @return The resolved namespace, or <jk>null</jk> if the namespace could not be resolved. | |
*/ | |
public static Namespace findNamespace(List<Rdf> rdfs, List<RdfSchema> schemas) { | |
for (Rdf rdf : rdfs) { | |
Namespace ns = findNamespace(rdf.prefix(), rdf.namespace(), rdfs, schemas); | |
if (ns != null) | |
return ns; | |
} | |
for (RdfSchema schema : schemas) { | |
Namespace ns = findNamespace(schema.prefix(), schema.namespace(), null, schemas); | |
if (ns != null) | |
return ns; | |
} | |
return null; | |
} | |
private static Namespace findNamespace(String prefix, String ns, List<Rdf> rdfs, List<RdfSchema> schemas) { | |
// If both prefix and namespace specified, use that Namespace mapping. | |
if (! (prefix.isEmpty() || ns.isEmpty())) | |
return Namespace.create(prefix, ns); | |
// If only prefix specified, need to search for namespaceURI. | |
if (! prefix.isEmpty()) { | |
if (rdfs != null) | |
for (Rdf rdf2 : rdfs) | |
if (rdf2.prefix().equals(prefix) && ! rdf2.namespace().isEmpty()) | |
return Namespace.create(prefix, rdf2.namespace()); | |
for (RdfSchema schema : schemas) { | |
if (schema.prefix().equals(prefix) && ! schema.namespace().isEmpty()) | |
return Namespace.create(prefix, schema.namespace()); | |
for (RdfNs rdfNs : schema.rdfNs()) | |
if (rdfNs.prefix().equals(prefix)) | |
return Namespace.create(prefix, rdfNs.namespaceURI()); | |
} | |
throw new BeanRuntimeException("Found @Rdf.prefix annotation with no matching URI. prefix='"+prefix+"'"); | |
} | |
// If only namespaceURI specified, need to search for prefix. | |
if (! ns.isEmpty()) { | |
if (rdfs != null) | |
for (Rdf rdf2 : rdfs) | |
if (rdf2.namespace().equals(ns) && ! rdf2.prefix().isEmpty()) | |
return Namespace.create(rdf2.prefix(), ns); | |
for (RdfSchema schema : schemas) { | |
if (schema.namespace().equals(ns) && ! schema.prefix().isEmpty()) | |
return Namespace.create(schema.prefix(), ns); | |
for (RdfNs rdfNs : schema.rdfNs()) | |
if (rdfNs.namespaceURI().equals(ns)) | |
return Namespace.create(rdfNs.prefix(), ns); | |
} | |
} | |
return null; | |
} | |
} |