com.marklogic.client.example.extension.GraphSPARQLExample Maven / Gradle / Ivy

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/*
 * Copyright 2012-2016 MarkLogic Corporation
 *
 * 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.
 */
package com.marklogic.client.example.extension;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import com.marklogic.client.DatabaseClient;
import com.marklogic.client.DatabaseClientFactory;
import com.marklogic.client.example.cookbook.Util;
import com.marklogic.client.example.cookbook.Util.ExampleProperties;
import com.marklogic.client.io.InputStreamHandle;
import com.marklogic.client.io.StringHandle;
import com.marklogic.client.semantics.GraphManager;
import com.marklogic.client.semantics.RDFMimeTypes;
import com.marklogic.client.semantics.SPARQLQueryDefinition;
import com.marklogic.client.semantics.SPARQLQueryManager;

public class GraphSPARQLExample {
    private static String GRAPH_URI = "com.marklogic.client.example.extension.GraphSPARQLExample";

    public static void main(String... args) throws IOException {
        ExampleProperties props = Util.loadProperties();

        DatabaseClient appClient = DatabaseClientFactory.newClient(
                props.host, props.port,
                props.writerUser, props.writerPassword, props.authType);
        DatabaseClient adminClient = DatabaseClientFactory.newClient(
                props.host, props.port,
                props.adminUser, props.adminPassword, props.authType);
        run(appClient, adminClient);
        appClient.release();
        adminClient.release();
    }

    public static void run(DatabaseClient appClient, DatabaseClient adminClient) throws IOException {
        insertGraph(appClient);

        runQuery(appClient);

        deleteGraph(appClient);
    }

    public static void runQuery(DatabaseClient appClient) throws IOException {
        SPARQLQueryManager sparqlMgr = appClient.newSPARQLQueryManager();

        InputStream queryStream = Util.openStream(
                "scripts"+File.separator+"whoKnowsSwarthmore.sparql");
        if (queryStream == null)
            throw new RuntimeException("Could not read SPARQL query");

        InputStreamHandle queryHandle = new InputStreamHandle(queryStream);

        StringHandle result = new StringHandle();

        System.out.println("running query");
        SPARQLQueryDefinition query = sparqlMgr.newQueryDefinition(queryHandle);
        query.setCollections(GRAPH_URI);

        sparqlMgr.executeSelect(query, result);

        System.out.println(result.get());
    }

    public static void insertGraph(DatabaseClient appClient) throws IOException {
        InputStream tripleStream = Util.openStream(
                "data"+File.separator+"foaf1.nt");
        if (tripleStream == null)
            throw new RuntimeException("Could not read triples");

        GraphManager graphMgr = appClient.newGraphManager();

        System.out.println("inserting graph");

        graphMgr.write(GRAPH_URI, new InputStreamHandle(tripleStream).withMimetype(RDFMimeTypes.NQUADS));

        System.out.println("inserted graph");
    }

    public static void deleteGraph(DatabaseClient appClient) throws IOException {
        GraphManager graphMgr = appClient.newGraphManager();

        System.out.println("deleting graph");

        graphMgr.delete(GRAPH_URI);;

        System.out.println("deleted graph");
    }
}