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net.sansa_stack.rdf.spark.io.nquads

NQuadReader

Related Doc: package nquads

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object NQuadReader

An N-Triples reader. One triple per line is assumed.

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  12. def load(session: SparkSession, path: String, stopOnBadTerm: ErrorParseMode.Value = ErrorParseMode.STOP, stopOnWarnings: WarningParseMode.Value = WarningParseMode.IGNORE, checkRDFTerms: Boolean = false, errorLog: Logger = ErrorHandlerFactory.stdLogger): RDD[Triple]

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    Loads N-Triples data from a file or directory into an RDD.

    Loads N-Triples data from a file or directory into an RDD. The path can also contain multiple paths and even wildcards, e.g. "/my/dir1,/my/paths/part-00[0-5]*,/another/dir,/a/specific/file"

    Handling of errors

    By default, it stops once a parse error occurs, i.e. a org.apache.jena.riot.RiotException will be thrown generated by the underlying parser.

    The following options exist:

    • STOP the whole data loading process will be stopped and a org.apache.jena.net.sansa_stack.rdf.spark.riot.RiotException will be thrown
    • SKIP the line will be skipped but the data loading process will continue, an error message will be logged
    Handling of warnings

    If the additional checking of RDF terms is enabled, warnings during parsing can occur. For example, a wrong lexical form of a literal w.r.t. to its datatype will lead to a warning.

    The following can be done with those warnings:

    • IGNORE the warning will just be logged to the configured logger
    • STOP similar to the error handling mode, the whole data loading process will be stopped and a org.apache.jena.riot.RiotException will be thrown
    • SKIP similar to the error handling mode, the line will be skipped but the data loading process will continue
    Checking of RDF terms

    Set whether to perform checking of NTriples - defaults to no checking.

    Checking adds warnings over and above basic syntax errors. This can also be used to turn warnings into exceptions if the option stopOnWarnings is set to STOP or SKIP.

    • IRIs - whether IRIs confirm to all the rules of the IRI scheme
    • Literals: whether the lexical form conforms to the rules for the datatype.
    • Triples: check slots have a valid kind of RDF term (parsers usually make this a syntax error anyway).

    See also the optional errorLog argument to control the output. The default is to log.

    session

    the Spark session

    path

    the path to the N-Triples file(s)

    stopOnBadTerm

    stop parsing on encountering a bad RDF term

    stopOnWarnings

    stop parsing on encountering a warning

    checkRDFTerms

    run with checking of literals and IRIs either on or off

    errorLog

    the logger used for error message handling

    returns

    the RDD of triples

  13. def load(session: SparkSession, paths: Seq[URI]): RDD[Triple]

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    Loads N-Triples data from a set of files or directories into an RDD.

    Loads N-Triples data from a set of files or directories into an RDD. The path can also contain multiple paths and even wildcards, e.g. "/my/dir1,/my/paths/part-00[0-5]*,/another/dir,/a/specific/file"

    session

    the Spark session

    paths

    the path to the N-Triples file(s)

    returns

    the RDD of triples

  14. def load(session: SparkSession, path: URI): RDD[Triple]

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    Loads N-Triples data from a file or directory into an RDD.

    Loads N-Triples data from a file or directory into an RDD.

    session

    the Spark session

    path

    the path to the N-Triples file(s)

    returns

    the RDD of triples

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