Hello,
I have a use case to read a GenericRecord from its JSON Avro representation
with strict validations. For example, with an Avro schema of two fields 'id'
and 'name', if the JSON has an undefined field, say 'age', I need to raise a
validation exception.
Could you please recommend a way to achieve this with Avro API?
Following is a test case for the requirement.
@Test(expected = IOException.class)
public void validateUndefinedFields() throws Exception {
Schema schema = new Schema.Parser().parse(
"{\"type\": \"record\","
+ "\"name\": \"Test\","
+ "\"namespace\": \"com.example\","
+ "\"fields\":
[{\"name\":\"id\",\"type\":\"string\"},{\"name\":\"name\",\"type\":\"string\"}]}");
DatumReader<GenericRecord> datumReader = new GenericDatumReader<>(schema);
String json = "{\"id\":\"1\", \"age\":27, \"name\":\"abc\"}"; // 'age' is
undefined in the schema
DecoderFactory decoderFactory = DecoderFactory.get();
Decoder jsonDecoder = decoderFactory.jsonDecoder(schema, json);
// This currently does not fail validations.
// TODO: How to validate there are no undefined fields in the input JSON?
datumReader.read(null, jsonDecoder);
}
Thank you.
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