001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2025-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.thing.java;
019
020import dev.enola.thing.Link;
021import dev.enola.thing.Thing;
022
023import java.util.Optional;
024
025public class RdfAnnotations {
026
027    // TODO Cache these! Because repeated Class.getAnnotation() is quite expensive.
028
029    @SuppressWarnings("OptionalOfNullableMisuse")
030    static Optional<String> classIRI(Class<?> clazz) {
031        return Optional.ofNullable(clazz.getAnnotation(RdfClass.class)).map(RdfClass::iri);
032    }
033
034    public static void addType(Class<?> clazz, Thing.Builder<?> builder) {
035        if (builder instanceof HasType.Builder<?> hasTypeBuilder)
036            classIRI(clazz).ifPresent(hasTypeBuilder::addType);
037        else classIRI(clazz).ifPresent(classIRI -> builder.add(HasType.IRI, new Link(classIRI)));
038    }
039}