60 lines
2.2 KiB
Java
60 lines
2.2 KiB
Java
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package eu.dnetlib.dhp.collection.plugin.mongodb;
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import java.util.Optional;
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import java.util.Spliterator;
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import java.util.Spliterators;
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import java.util.stream.Stream;
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import java.util.stream.StreamSupport;
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import org.bson.Document;
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import com.mongodb.MongoClient;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoDatabase;
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import eu.dnetlib.dhp.collection.ApiDescriptor;
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import eu.dnetlib.dhp.collection.CollectorException;
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import eu.dnetlib.dhp.collection.CollectorPluginReport;
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import eu.dnetlib.dhp.collection.plugin.CollectorPlugin;
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public class MongoDbCollectorPlugin implements CollectorPlugin {
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public static final String MONGODB_HOST = "mongodb_host";
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public static final String MONGODB_PORT = "mongodb_port";
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public static final String MONGODB_COLLECTION = "mongodb_collection";
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public static final String MONGODB_DBNAME = "mongodb_dbname";
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@Override
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public Stream<String> collect(ApiDescriptor api, CollectorPluginReport report) throws CollectorException {
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final String host = Optional
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.ofNullable(api.getParams().get(MONGODB_HOST))
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.orElseThrow(() -> new CollectorException(String.format("missing parameter '%s'", MONGODB_HOST)));
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final Integer port = Optional
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.ofNullable(api.getParams().get(MONGODB_PORT))
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.map(Integer::parseInt)
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.orElseThrow(() -> new CollectorException(String.format("missing parameter '%s'", MONGODB_PORT)));
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final String dbName = Optional
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.ofNullable(api.getParams().get(MONGODB_DBNAME))
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.orElseThrow(() -> new CollectorException(String.format("missing parameter '%s'", MONGODB_DBNAME)));
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final String collection = Optional
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.ofNullable(api.getParams().get(MONGODB_COLLECTION))
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.orElseThrow(() -> new CollectorException(String.format("missing parameter '%s'", MONGODB_COLLECTION)));
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final MongoClient mongoClient = new MongoClient(host, port);
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final MongoDatabase database = mongoClient.getDatabase(dbName);
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final MongoCollection<Document> mdstore = database.getCollection(collection);
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long size = mdstore.count();
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return StreamSupport
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.stream(
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Spliterators.spliterator(mdstore.find().iterator(), size, Spliterator.SIZED), false)
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.map(doc -> doc.getString("body"));
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}
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}
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