commons-rdf-jsonld-java/src/main/java/org/apache/commons/rdf/jsonldjava/JsonLdQuadLike.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.
 */
package org.apache.commons.rdf.jsonldjava;

import java.util.Optional;

import org.apache.commons.rdf.api.QuadLike;
import org.apache.commons.rdf.api.RDFTerm;

import com.github.jsonldjava.core.RDFDataset.Quad;

public interface JsonLdQuadLike<G extends RDFTerm> extends QuadLike<G>, JsonLdTripleLike {

}

class JsonLdQuadLikeImpl<S extends RDFTerm, P extends RDFTerm, O extends RDFTerm, G extends RDFTerm>
        implements JsonLdQuadLike<G> {

    // Note: We always pass the blankNodePrefix and don't rely on the internal
    // blankNodePrefix in this static factory
    private static JsonLdRDF rdfTermFactory = new JsonLdRDF();

    private final Quad quad;
    private final String blankNodePrefix;

    JsonLdQuadLikeImpl(final Quad jsonldQuad, final String blankNodePrefix) {
        this.quad = jsonldQuad;
        this.blankNodePrefix = blankNodePrefix;
    }

    @SuppressWarnings("unchecked")
    @Override
    public Optional<G> getGraphName() {
        final G g = (G) rdfTermFactory.asRDFTerm(quad.getGraph(), blankNodePrefix);
        return Optional.ofNullable(g);
    }

    @SuppressWarnings("unchecked")
    @Override
    public S getSubject() {
        return (S) rdfTermFactory.asRDFTerm(quad.getSubject(), blankNodePrefix);
    }

    @SuppressWarnings("unchecked")
    @Override
    public P getPredicate() {
        return (P) rdfTermFactory.asRDFTerm(quad.getPredicate(), blankNodePrefix);
    }

    @SuppressWarnings("unchecked")
    @Override
    public O getObject() {
        return (O) rdfTermFactory.asRDFTerm(quad.getObject(), blankNodePrefix);
    }

    @Override
    public Quad asJsonLdQuad() {
        return quad;
    }

    @Override
    public String toString() {
        return quad.toString();
    }
}