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package org.semanticweb.owlapi.vocab;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.annotation.Nonnull;

import org.semanticweb.owlapi.formats.FunctionalSyntaxDocumentFormat;
import org.semanticweb.owlapi.formats.ManchesterSyntaxDocumentFormat;
import org.semanticweb.owlapi.formats.OBODocumentFormat;
import org.semanticweb.owlapi.formats.OWLXMLDocumentFormat;
import org.semanticweb.owlapi.formats.RDFXMLDocumentFormat;
import org.semanticweb.owlapi.formats.TurtleDocumentFormat;
import org.semanticweb.owlapi.model.OWLDocumentFormat;

/**
 * A mapping between some known ontology formats and the common file extensions used for them. This
 * mapping is not necessarily complete and file extensions are not mandatory, so do not rely on this
 * as a filter to determine what is the format of an input file.
 */
public enum Extensions {
    /** RDF/XML, common extensions: owl, rdf, rdfs */
    RDFXML(RDFXMLDocumentFormat.class, ".owl", ".rdf", ".rdfs"),
    /** OWL/XML, common extensions: xml, owl, rdf */
    OWLXML(OWLXMLDocumentFormat.class, ".xml", ".owl", ".rdf"),
    /** Turtle, common extensions: ttl, owl */
    TURTLE(TurtleDocumentFormat.class, ".ttl", ".owl"),
    /** OBO, common extensions: obo */
    OBO(OBODocumentFormat.class, ".obo"),
    /** Manchester OWL syntax, common extensions: omn, owl */
    MANCHESTERSYNTAX(ManchesterSyntaxDocumentFormat.class, ".omn", ".owl"),
    /** Functional syntax, common extensions: fss, owl */
    FUNCTIONALSYNTAX(FunctionalSyntaxDocumentFormat.class, ".fss", ".owl");

    private List extensions;
    private Class documentFormat;

    private Extensions(Class d, String... knownExtensions) {
        documentFormat = d;
        extensions = Arrays.asList(knownExtensions);
    }

    /**
     * @return common extensions for this type
     */
    @Nonnull
    public Iterable getCommonExtensions() {
        return extensions;
    }

    /**
     * @param format the format for which extensions are desired
     * @return common extensions list. Empty list if no matching type is found.
     */
    @Nonnull
    public static Iterable getCommonExtensions(Class format) {
        for (Extensions e : values()) {
            if (e.documentFormat.equals(format)) {
                return e.getCommonExtensions();
            }
        }
        return Collections.emptyList();
    }
}