You could use the ReflectDatumWriter to write a simple java data class to Avro, and you can create instances of such classes from JSON using a library like Jackson. There is a JSON encoding for Avro, if your data conformed to that format (which would be more verbose than what you have below) you could use that to decode it, then re-encode it to binary. Lastly you can use the SpecificDatum API, generate Java classes from your schema, then set the data from the json with its type-safe builder pattern APIs instead of the loose Generic API.
On 1/7/13 3:46 AM, "Pratyush Chandra" <chandra.praty...@gmail.com> wrote: > >Hi, > >I am new to Avro. I was going through examples and figured out that >GenericRecord can be appended to DataFileWriter and then serialized. > >Example: >record.avsc is >{ > "namespace": "example.proto", > "name": "Message", "type": "record", > "fields": [ > {"name": "to", "type": ["string","null"]} > ] >} > >and my code snippet is : > DatumWriter<GenericRecord> datumWriter = new >GenericDatumWriter<GenericRecord>(schema); > DataFileWriter<GenericRecord> dataFileWriter = new >DataFileWriter<GenericRecord>(datumWriter); > dataFileWriter.create(schema, file); > GenericRecord message1= new GenericData.Record(schema); > message1.put("to", "Alyssa"); > dataFileWriter.append(message1); > dataFileWriter.close(); > >My question is : Suppose I am receiving a json from server, and based on >schema I would like to serialize it directly, without parsing it. >For example : >Input received is {"to": "Alyssa"} >Is there a way, I can serialize above json with record.avsc schema >instead of appending GenericRecord ? > >-- >Pratyush Chandra