world.data.jdbc.internal.transport.RdfParser Maven / Gradle / Ivy

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/*
 * dw-jdbc
 * Copyright 2017 data.world, Inc.

 * 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.
 *
 * This product includes software developed at data.world, Inc.(http://www.data.world/).
 */
package world.data.jdbc.internal.transport;

import com.fasterxml.jackson.core.JsonParser;
import world.data.jdbc.model.Node;

import java.io.InputStream;
import java.util.Arrays;
import java.util.Iterator;

/**
 * Parses a {@link Response} object in
 * application/rdf+json format.
 */
final class RdfParser implements StreamParser {

    @Override
    public String getAcceptType() {
        return "application/rdf+json";
    }

    @Override
    public Response parse(InputStream in, String contentType) throws Exception {
        JsonParser parser = ParserUtil.JSON_FACTORY.createParser(in);
        Response.Column[] columns = {
                Response.Column.builder().name("Subject").required(true).build(),
                Response.Column.builder().name("Predicate").required(true).build(),
                Response.Column.builder().name("Object").required(true).build(),
        };
        Iterator triples = new TriplesParser(parser);
        return Response.builder()
                .columns(Arrays.asList(columns))
                .rows(triples)
                .cleanup(parser)
                .build();
    }
}