/**
* Convert this object, in the org.apache.kafka.connect.data format, into a JSON object, returning
* both the schema and the converted object.
*/
private static JsonNode convertToJson(Schema schema, Object logicalValue) {
if (logicalValue == null) {
if (schema
== null) // Any schema is valid and we don't have a default, so treat this as an optional
// schema
return null;
if (schema.defaultValue() != null) return convertToJson(schema, schema.defaultValue());
if (schema.isOptional()) return JsonNodeFactory.instance.nullNode();
throw new DataException(
"Conversion error: null value for field that is required and has no default value");
}
Object value = logicalValue;
if (schema != null && schema.name() != null) {
LogicalTypeConverter logicalConverter = TO_JSON_LOGICAL_CONVERTERS.get(schema.name());
if (logicalConverter != null) value = logicalConverter.convert(schema, logicalValue);
}
try {
final Schema.Type schemaType;
if (schema == null) {
schemaType = ConnectSchema.schemaType(value.getClass());
if (schemaType == null)
throw new DataException(
"Java class " + value.getClass() + " does not have corresponding schema type.");
} else {
schemaType = schema.type();
}
switch (schemaType) {
case INT8:
return JsonNodeFactory.instance.numberNode((Byte) value);
case INT16:
return JsonNodeFactory.instance.numberNode((Short) value);
case INT32:
return JsonNodeFactory.instance.numberNode((Integer) value);
case INT64:
return JsonNodeFactory.instance.numberNode((Long) value);
case FLOAT32:
return JsonNodeFactory.instance.numberNode((Float) value);
case FLOAT64:
return JsonNodeFactory.instance.numberNode((Double) value);
case BOOLEAN:
return JsonNodeFactory.instance.booleanNode((Boolean) value);
case STRING:
CharSequence charSeq = (CharSequence) value;
return JsonNodeFactory.instance.textNode(charSeq.toString());
case BYTES:
if (value instanceof byte[]) return JsonNodeFactory.instance.binaryNode((byte[]) value);
else if (value instanceof ByteBuffer)
return JsonNodeFactory.instance.binaryNode(((ByteBuffer) value).array());
else throw new DataException("Invalid type for bytes type: " + value.getClass());
case ARRAY:
{
Collection collection = (Collection) value;
ArrayNode list = JsonNodeFactory.instance.arrayNode();
for (Object elem : collection) {
Schema valueSchema = schema == null ? null : schema.valueSchema();
JsonNode fieldValue = convertToJson(valueSchema, elem);
list.add(fieldValue);
}
return list;
}
case MAP:
{
Map<?, ?> map = (Map<?, ?>) value;
// If true, using string keys and JSON object; if false, using non-string keys and
// Array-encoding
boolean objectMode;
if (schema == null) {
objectMode = true;
for (Map.Entry<?, ?> entry : map.entrySet()) {
if (!(entry.getKey() instanceof String)) {
objectMode = false;
break;
}
}
} else {
objectMode = schema.keySchema().type() == Schema.Type.STRING;
}
ObjectNode obj = null;
ArrayNode list = null;
if (objectMode) obj = JsonNodeFactory.instance.objectNode();
else list = JsonNodeFactory.instance.arrayNode();
for (Map.Entry<?, ?> entry : map.entrySet()) {
Schema keySchema = schema == null ? null : schema.keySchema();
Schema valueSchema = schema == null ? null : schema.valueSchema();
JsonNode mapKey = convertToJson(keySchema, entry.getKey());
JsonNode mapValue = convertToJson(valueSchema, entry.getValue());
if (objectMode) obj.set(mapKey.asText(), mapValue);
else list.add(JsonNodeFactory.instance.arrayNode().add(mapKey).add(mapValue));
}
return objectMode ? obj : list;
}
case STRUCT:
{
Struct struct = (Struct) value;
if (struct.schema() != schema) throw new DataException("Mismatching schema.");
ObjectNode obj = JsonNodeFactory.instance.objectNode();
for (Field field : schema.fields()) {
obj.set(field.name(), convertToJson(field.schema(), struct.get(field)));
}
return obj;
}
}
throw new DataException("Couldn't convert " + value + " to JSON.");
} catch (ClassCastException e) {
throw new DataException("Invalid type for " + schema.type() + ": " + value.getClass());
}
}
private ObjectNode asJsonSchema(Schema schema) {
if (schema == null) return null;
ObjectNode cached = fromConnectSchemaCache.get(schema);
if (cached != null) return cached;
final ObjectNode jsonSchema;
switch (schema.type()) {
case BOOLEAN:
jsonSchema = JsonSchema.BOOLEAN_SCHEMA.deepCopy();
break;
case BYTES:
jsonSchema = JsonSchema.BYTES_SCHEMA.deepCopy();
break;
case FLOAT64:
jsonSchema = JsonSchema.DOUBLE_SCHEMA.deepCopy();
break;
case FLOAT32:
jsonSchema = JsonSchema.FLOAT_SCHEMA.deepCopy();
break;
case INT8:
jsonSchema = JsonSchema.INT8_SCHEMA.deepCopy();
break;
case INT16:
jsonSchema = JsonSchema.INT16_SCHEMA.deepCopy();
break;
case INT32:
jsonSchema = JsonSchema.INT32_SCHEMA.deepCopy();
break;
case INT64:
jsonSchema = JsonSchema.INT64_SCHEMA.deepCopy();
break;
case STRING:
jsonSchema = JsonSchema.STRING_SCHEMA.deepCopy();
break;
case ARRAY:
jsonSchema =
JsonNodeFactory.instance
.objectNode()
.put(JsonSchema.SCHEMA_TYPE_FIELD_NAME, JsonSchema.ARRAY_TYPE_NAME);
jsonSchema.set(JsonSchema.ARRAY_ITEMS_FIELD_NAME, asJsonSchema(schema.valueSchema()));
break;
case MAP:
jsonSchema =
JsonNodeFactory.instance
.objectNode()
.put(JsonSchema.SCHEMA_TYPE_FIELD_NAME, JsonSchema.MAP_TYPE_NAME);
jsonSchema.set(JsonSchema.MAP_KEY_FIELD_NAME, asJsonSchema(schema.keySchema()));
jsonSchema.set(JsonSchema.MAP_VALUE_FIELD_NAME, asJsonSchema(schema.valueSchema()));
break;
case STRUCT:
jsonSchema =
JsonNodeFactory.instance
.objectNode()
.put(JsonSchema.SCHEMA_TYPE_FIELD_NAME, JsonSchema.STRUCT_TYPE_NAME);
ArrayNode fields = JsonNodeFactory.instance.arrayNode();
for (Field field : schema.fields()) {
ObjectNode fieldJsonSchema = asJsonSchema(field.schema()).deepCopy();
fieldJsonSchema.put(JsonSchema.STRUCT_FIELD_NAME_FIELD_NAME, field.name());
fields.add(fieldJsonSchema);
}
jsonSchema.set(JsonSchema.STRUCT_FIELDS_FIELD_NAME, fields);
break;
default:
throw new DataException("Couldn't translate unsupported schema type " + schema + ".");
}
jsonSchema.put(JsonSchema.SCHEMA_OPTIONAL_FIELD_NAME, schema.isOptional());
if (schema.name() != null) jsonSchema.put(JsonSchema.SCHEMA_NAME_FIELD_NAME, schema.name());
if (schema.version() != null)
jsonSchema.put(JsonSchema.SCHEMA_VERSION_FIELD_NAME, schema.version());
if (schema.doc() != null) jsonSchema.put(JsonSchema.SCHEMA_DOC_FIELD_NAME, schema.doc());
if (schema.parameters() != null) {
ObjectNode jsonSchemaParams = JsonNodeFactory.instance.objectNode();
for (Map.Entry<String, String> prop : schema.parameters().entrySet())
jsonSchemaParams.put(prop.getKey(), prop.getValue());
jsonSchema.set(JsonSchema.SCHEMA_PARAMETERS_FIELD_NAME, jsonSchemaParams);
}
if (schema.defaultValue() != null)
jsonSchema.set(
JsonSchema.SCHEMA_DEFAULT_FIELD_NAME, convertToJson(schema, schema.defaultValue()));
fromConnectSchemaCache.put(schema, jsonSchema);
return jsonSchema;
}