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.format.tika.rdf;
019
020import dev.enola.common.io.resource.ReadableResource;
021import dev.enola.common.io.resource.ResourceProvider;
022import dev.enola.common.io.resource.WritableResource;
023import dev.enola.common.io.resource.convert.CatchingResourceConverter;
024import dev.enola.format.tika.TikaThingConverter;
025import dev.enola.rdf.io.JavaThingRdfConverter;
026import dev.enola.rdf.io.WritableResourceRDFHandler;
027import dev.enola.thing.repo.ThingMemoryRepositoryROBuilder;
028
029public class TikaResourceIntoRdfResourceConverter implements CatchingResourceConverter {
030
031    private final TikaThingConverter tikaThingConverter;
032    private final JavaThingRdfConverter javaToRdf = new JavaThingRdfConverter();
033
034    public TikaResourceIntoRdfResourceConverter(ResourceProvider rp) {
035        this.tikaThingConverter = new TikaThingConverter(rp);
036    }
037
038    @Override
039    public boolean convertIntoThrows(ReadableResource from, WritableResource into)
040            throws Exception {
041
042        var store = new ThingMemoryRepositoryROBuilder();
043        if (!tikaThingConverter.convertInto(from.uri(), store)) return false;
044
045        var rdfHandler = WritableResourceRDFHandler.create(into);
046        if (rdfHandler.isEmpty()) return false;
047
048        try (var closeableRDFHandler = rdfHandler.get()) {
049            return javaToRdf.convertInto(store.stream(), closeableRDFHandler);
050        }
051    }
052}