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/*
 * Copyright 2020 APICATALOG and HASMAC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package no.hasmac.rdf.spi;

import no.hasmac.jsonld.http.media.MediaType;
import no.hasmac.rdf.RdfDataset;
import no.hasmac.rdf.RdfGraph;
import no.hasmac.rdf.RdfLiteral;
import no.hasmac.rdf.RdfNQuad;
import no.hasmac.rdf.RdfResource;
import no.hasmac.rdf.RdfTriple;
import no.hasmac.rdf.RdfValue;
import no.hasmac.rdf.RdfValueFactory;
import no.hasmac.rdf.impl.DefaultRdfProvider;
import no.hasmac.rdf.io.RdfReader;
import no.hasmac.rdf.io.RdfWriter;
import no.hasmac.rdf.io.error.UnsupportedContentException;

import java.io.Reader;
import java.io.Writer;
import java.util.Collection;

public abstract class RdfProvider implements RdfValueFactory {

    private static RdfProvider provider = null;

    protected RdfProvider() {
    }

    public static RdfProvider provider() {
        return provider != null ? provider : DefaultRdfProvider.INSTANCE;
    }

    public static void setProvider(RdfProvider instance) {
        provider = instance;
    }

    public abstract RdfDataset createDataset();

    public abstract Collection canRead();

    public abstract RdfReader createReader(MediaType contentType, Reader reader) throws UnsupportedContentException;

    public abstract Collection canWrite();

    public abstract RdfWriter createWriter(MediaType contentType, Writer writer) throws UnsupportedContentException;

    public abstract RdfGraph createGraph();

}