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package org.apache.juneau.jena;

import static org.apache.juneau.internal.CollectionUtils.*;

import java.util.*;

import org.apache.juneau.*;
import org.apache.juneau.jena.annotation.*;
import org.apache.juneau.xml.*;

/**
 * Metadata on classes specific to the RDF serializers and parsers pulled from the {@link Rdf @Rdf} annotation on the
 * class.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc jmr.RdfDetails}
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public class RdfClassMeta extends ExtendedClassMeta {

	private final RdfCollectionFormat collectionFormat;
	private final Namespace namespace;

	/**
	 * Constructor.
	 *
	 * @param cm The class that this annotation is defined on.
	 * @param mp RDF metadata provider (for finding information about other artifacts).
	 */
	public RdfClassMeta(ClassMeta<?> cm, RdfMetaProvider mp) {
		super(cm);
		List<Rdf> rdfs = list();
		List<RdfSchema> schemas = list();
		cm.forEachAnnotation(Rdf.class, x -> true, x -> rdfs.add(x));
		cm.forEachAnnotation(RdfSchema.class, x -> true, x -> schemas.add(x));

		this.collectionFormat = rdfs.stream().map(x -> x.collectionFormat()).filter(x -> x != RdfCollectionFormat.DEFAULT).findFirst().orElse(RdfCollectionFormat.DEFAULT);
		this.namespace = RdfUtils.findNamespace(rdfs, schemas);
	}

	/**
	 * Returns the {@link Rdf#collectionFormat() @Rdf(collectionFormat)} annotation defined on the class.
	 *
	 * @return The value of the annotation, or <jk>null</jk> if annotation is not
	 * specified.
	 */
	protected RdfCollectionFormat getCollectionFormat() {
		return collectionFormat;
	}

	/**
	 * Returns the RDF namespace associated with this class.
	 *
	 * <p>
	 * Namespace is determined in the following order of {@link Rdf#prefix() @Rdf(prefix)} annotation:
	 * <ol>
	 * 	<li>Class.
	 * 	<li>Package.
	 * 	<li>Superclasses.
	 * 	<li>Superclass packages.
	 * 	<li>Interfaces.
	 * 	<li>Interface packages.
	 * </ol>
	 *
	 * @return The namespace associated with this class, or <jk>null</jk> if no namespace is associated with it.
	 */
	protected Namespace getNamespace() {
		return namespace;
	}
}
