001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2024-2026 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.validation;
019
020import dev.enola.thing.Link;
021import dev.enola.thing.PredicatesObjects;
022import dev.enola.thing.repo.ThingRepository;
023
024import java.net.URI;
025
026public class LinksValidator implements Validator<PredicatesObjects> {
027
028    private final ThingRepository repo;
029
030    public LinksValidator(ThingRepository repo) {
031        this.repo = repo;
032    }
033
034    @Override
035    public void validate(PredicatesObjects thing, Collector collector) {
036        thing.datatypes()
037                .forEach((predicateIRI, datatypeIRI) -> c(predicateIRI, datatypeIRI, collector));
038        thing.properties().forEach((predicateIRI, object) -> c(predicateIRI, object, collector));
039    }
040
041    private void c(String predicateIRI, String linkedIRI, Collector collector) {
042        if (linkedIRI.startsWith("file:"))
043            // TODO Remove this workaround again eventually
044            // file: shouldn't be Links in the first place (but :URL)
045            return;
046
047        if (repo.get(linkedIRI) == null) {
048            collector.add(predicateIRI, "Unknown thing: " + linkedIRI);
049        }
050    }
051
052    private void c(String predicateIRI, Object object, Collector collector) {
053        if (object instanceof Link link) {
054            c(predicateIRI, link.iri(), collector);
055        } else if (object instanceof URI uri) {
056            c(predicateIRI, uri.toString(), collector);
057        } else if (object instanceof PredicatesObjects predicatesObjects) {
058            validate(predicatesObjects, collector);
059        } else if (object instanceof Iterable<?> iterable) {
060            for (var element : iterable) {
061                if (element instanceof PredicatesObjects thing) {
062                    validate(thing, collector);
063                }
064            }
065        } // else skip it
066    }
067}