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Add a new TRACKER_RDF_FORMAT_JSON_LD TrackerRdfFormat enum value, and use
the serializer/deserializer objects for those, so that this new value is
accepted in all API that takes this enum.
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Implementations of this object poked the given cursor's connection in order
to get a TrackerNamespaceManager. This usually works with cursors from
queries, but we want to use serializers with data not necessarily coming
from a connection, so pass explicitly the TrackerNamespaceManager to use
during serialization.
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Since all internal tracker library interaction stays within library code and
is no longer done on modules for the HTTP connection/endpoint, we no longer
need these hacks to ensure single registration of types.
This reverts commit 787c4ff6e2132559545475b9dae31eebbe49ff7a.
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This format is similar to turtle, but allows keeping graph information.
It might be more convenient for exporting/importing sometimes, so support
serializing to this format.
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The serializer is not taking a ref on the related cursor, but dropping
one on finalize. Make it take a ref during its lifetime on the cursor,
and change the only user so it doesn't account for this oddity.
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This serializer takes a TrackerSparqlCursor with 3 columns (subject,
predicate, object) and serializes it into Turtle format. Unused at
the moment.
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For now, the private TrackerSerializer API was only used in the
TrackerEndpointHttp object, which is compiled as a loadable module since
we support linking with soup 2.x and 3.x simultaneously.
Now that we are introducing usage of this private API from other places
in code, we risk getting the dreaded "type already registered" errors
from GType, since each of libtracker-sparql and the soup modules will
try to register their own.
Make creation of serializers more lenient wrt the GType lookup, so
there's no double registration of the same type, and ensure these GTypes
are initialized from libtracker-sparql so there's no confusion about
who comes first.
This is yet another braindead hack about libsoup loadable modules that
can be removed when we can pick one of them at build time.
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So they can be used just giving the expected TrackerSerializerFormat.
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This object is a subclass of GInputStream that takes a SPARQL
cursor on construction. It is meant to handle serialization of
SPARQL results into text formats.
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