Class RDFJSONWriter

    • Field Detail

      • writer

        private final java.io.Writer writer
      • actualFormat

        private final RDFFormat actualFormat
      • graph

        private Model graph
      • lastWrittenSubject

        private Resource lastWrittenSubject
      • lastWrittenPredicate

        private IRI lastWrittenPredicate
      • jg

        private com.fasterxml.jackson.core.JsonGenerator jg
      • isEmptyStream

        private boolean isEmptyStream
      • isStreaming

        private boolean isStreaming
    • Constructor Detail

      • RDFJSONWriter

        public RDFJSONWriter​(java.io.OutputStream out,
                             RDFFormat actualFormat)
      • RDFJSONWriter

        public RDFJSONWriter​(java.io.Writer writer,
                             RDFFormat actualFormat)
    • Method Detail

      • getWriter

        public java.io.Writer getWriter()
        Description copied from interface: CharSink
        get the Writer used by this CharSink.
        Specified by:
        getWriter in interface CharSink
        Returns:
        an Writer
      • endRDF

        public void endRDF()
                    throws RDFHandlerException
        Description copied from interface: RDFHandler
        Signals the end of the RDF data. This method is called when all data has been reported.
        Specified by:
        endRDF in interface RDFHandler
        Throws:
        RDFHandlerException - If the RDF handler has encountered an unrecoverable error.
      • handleNamespace

        public void handleNamespace​(java.lang.String prefix,
                                    java.lang.String uri)
                             throws RDFHandlerException
        Description copied from interface: RDFHandler
        Handles a namespace declaration/definition. A namespace declaration associates a (short) prefix string with the namespace's URI. The prefix for default namespaces, which do not have an associated prefix, are represented as empty strings.
        Specified by:
        handleNamespace in interface RDFHandler
        Overrides:
        handleNamespace in class AbstractRDFWriter
        Parameters:
        prefix - The prefix for the namespace, or an empty string in case of a default namespace.
        uri - The URI that the prefix maps to.
        Throws:
        RDFHandlerException - If the RDF handler has encountered an unrecoverable error.
      • writeObject

        public static void writeObject​(Value object,
                                       java.util.Set<Resource> contexts,
                                       com.fasterxml.jackson.core.JsonGenerator jg)
                                throws com.fasterxml.jackson.core.JsonGenerationException,
                                       java.io.IOException
        Helper method to reduce complexity of the JSON serialisation algorithm Any null contexts will only be serialised to JSON if there are also non-null contexts in the contexts array
        Parameters:
        object - The RDF value to serialise
        contexts - The set of contexts that are relevant to this object, including null contexts as they are found.
        jg - the JsonGenerator to write to.
        Throws:
        java.io.IOException
        com.fasterxml.jackson.core.JsonGenerationException
      • resourceToString

        public static java.lang.String resourceToString​(Resource uriOrBnode)
        Returns the correct syntax for a Resource, depending on whether it is a URI or a Blank Node (ie, BNode)
        Parameters:
        uriOrBnode - The resource to serialise to a string
        Returns:
        The string value of the RDF4J resource
      • modelToRdfJsonInternal

        public static void modelToRdfJsonInternal​(Model graph,
                                                  WriterConfig writerConfig,
                                                  com.fasterxml.jackson.core.JsonGenerator jg)
                                           throws java.io.IOException
        Throws:
        java.io.IOException
      • configureNewJsonFactory

        private com.fasterxml.jackson.core.JsonFactory configureNewJsonFactory()
        Get an instance of JsonFactory.
        Returns:
        A newly configured JsonFactory based on the currently enabled settings