On Thu, Apr 26, 2018 at 3:16 PM, Tatu Saloranta <[email protected]> wrote:
>
> Deserializers ask `JsonParser`, either via `getText()` or one of
> variants (`nextTextValue()`).
> Decoding is handled by parser, possibly eagerly (when `nextToken()` is
> called), possibly lazily (implementation dependant)
> Converting from byte stream to tokens is what parser does, and not
> something deserializers have
> direct effect on.
>
> So you would need to reimplement parser to make it flexible enough,
> and figure out how to pass
> information on alternate encoding(s) somehow.
>
> -+ Tatu +-
Tatu,
This advice is extremely helpful.
Based on this, I first created a copy of ReaderBasedJsonParser, with all of
the "final" method labeling stripped off so that I can override them with
hacked versions. Then I made a subclass of that thing, with extra logic
hooking everything that's creating or returning some strings from buffers
or wherever, so that I can inserrt the dynamic encoding detection trickery.
I have just one question left, about how to test or integrate this. The
constructors for these classes are somewhat internal-ish with some various
mysterious Jackson objects in them:
public CustomJsonParser(IOContext ctxt, int features, Reader r, ObjectCodec
codec, CharsToNameCanonicalizer st,
char[] inputBuffer, int start, int end, boolean bufferRecyclable) {
super(ctxt, features, r, codec, st, inputBuffer, start, end,
bufferRecyclable);
}
public CustomJsonParser(IOContext ctxt, int features, Reader r, ObjectCodec
codec, CharsToNameCanonicalizer st) {
super(ctxt, features, r, codec, st);
}
I wanted to check where I should look for some examples how to construct
this custom parser on some test input, or how to hook it up to some other
existing ObjectMapper / JsonGenerator / JsonFactory sort of exterior
classes, so that I can run some input through my new code and learn how it
will crash. ;)
Sincerely,
Matthew.
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