package com.fasterxml.jackson.dataformat.avro.schema;
import org.apache.avro.Schema;
import java.util.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitable;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonObjectFormatVisitor;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
public class RecordVisitor
extends JsonObjectFormatVisitor.Base
implements SchemaBuilder
{
protected final JavaType _type;
protected final DefinedSchemas _schemas;
protected Schema _avroSchema;
protected List<Schema.Field> _fields = new ArrayList<Schema.Field>();
public RecordVisitor(SerializerProvider p, JavaType type, DefinedSchemas schemas)
{
super(p);
_type = type;
_schemas = schemas;
_avroSchema = Schema.createRecord(AvroSchemaHelper.getName(type),
"Schema for "+type.toCanonical(),
AvroSchemaHelper.getNamespace(type), false);
schemas.addSchema(type, _avroSchema);
}
@Override
public Schema builtAvroSchema() {
// Assumption now is that we are done, so let's assign fields
_avroSchema.setFields(_fields);
return _avroSchema;
}
/*
/**********************************************************
/* JsonObjectFormatVisitor implementation
/**********************************************************
*/
@Override
public void property(BeanProperty writer) throws JsonMappingException
{
Schema schema = schemaForWriter(writer);
_fields.add(new Schema.Field(writer.getName(), schema, null, null));
}
@Override
public void property(String name, JsonFormatVisitable handler,
JavaType type) throws JsonMappingException
{
VisitorFormatWrapperImpl wrapper = new VisitorFormatWrapperImpl(_schemas);
handler.acceptJsonFormatVisitor(wrapper, type);
Schema schema = wrapper.getAvroSchema();
_fields.add(new Schema.Field(name, schema, null, null));
}
@Override
public void optionalProperty(BeanProperty writer) throws JsonMappingException {
Schema schema = schemaForWriter(writer);
/* 23-Nov-2012, tatu: Actually let's also assume that primitive type values
* are required, as Jackson does not distinguish whether optional has been
* defined, or is merely the default setting.
*/
if (!writer.getType().isPrimitive()) {
schema = AvroSchemaHelper.unionWithNull(schema);
}
_fields.add(new Schema.Field(writer.getName(), schema, null, null));
}
@Override
public void optionalProperty(String name, JsonFormatVisitable handler,
JavaType type) throws JsonMappingException
{
VisitorFormatWrapperImpl wrapper = new VisitorFormatWrapperImpl(_schemas);
handler.acceptJsonFormatVisitor(wrapper, type);
Schema schema = wrapper.getAvroSchema();
if (!type.isPrimitive()) {
schema = AvroSchemaHelper.unionWithNull(schema);
}
_fields.add(new Schema.Field(name, schema, null, null));
}
@Override
@Deprecated
public void property(String name) throws JsonMappingException {
AvroSchemaHelper.throwUnsupported();
}
@Override
@Deprecated
public void optionalProperty(String name) throws JsonMappingException {
AvroSchemaHelper.throwUnsupported();
}
/*
/**********************************************************************
/* Internal methods
/**********************************************************************
*/
protected Schema schemaForWriter(BeanProperty prop)
throws JsonMappingException
{
JsonSerializer<?> ser = null;
// 23-Nov-2012, tatu: Ideally shouldn't need to do this but...
if (prop instanceof BeanPropertyWriter) {
BeanPropertyWriter bpw = (BeanPropertyWriter) prop;
ser = bpw.getSerializer();
}
if (ser == null) {
SerializerProvider prov = getProvider();
if (prov == null) throw new Error();
ser = prov.findValueSerializer(prop.getType(), prop);
}
VisitorFormatWrapperImpl visitor = new VisitorFormatWrapperImpl(_schemas);
ser.acceptJsonFormatVisitor(visitor, prop.getType());
return visitor.getAvroSchema();
}
}