/**
* Serializes a field path in a record to a protobuf message using the specified descriptor.
*
* @param record Record with the field to serialize
* @param field The field to serialize
* @param fieldPath The field path of the specified field
* @param desc Protobuf descriptor
* @param messageTypeToExtensionMap Protobuf extension map
* @param defaultValueMap Protobuf default field values
* @return serialized message
* @throws DataGeneratorException
*/
private static DynamicMessage sdcFieldToProtobufMsg(
Record record,
Field field,
String fieldPath,
Descriptors.Descriptor desc,
Map<String, Set<Descriptors.FieldDescriptor>> messageTypeToExtensionMap,
Map<String, Object> defaultValueMap)
throws DataGeneratorException {
if (field == null) {
return null;
}
// compute all fields to look for including extensions
DynamicMessage.Builder builder = DynamicMessage.newBuilder(desc);
List<Descriptors.FieldDescriptor> fields = new ArrayList<>();
fields.addAll(desc.getFields());
if (messageTypeToExtensionMap.containsKey(desc.getFullName())) {
fields.addAll(messageTypeToExtensionMap.get(desc.getFullName()));
}
// root field is always a Map in a record representing protobuf data
Map<String, Field> valueAsMap = field.getValueAsMap();
for (Descriptors.FieldDescriptor f : fields) {
Field mapField = valueAsMap.get(f.getName());
// Repeated field
if (f.isMapField()) {
handleMapField(
record, mapField, fieldPath, messageTypeToExtensionMap, defaultValueMap, f, builder);
} else if (f.isRepeated()) {
handleRepeatedField(
record, mapField, fieldPath, messageTypeToExtensionMap, defaultValueMap, f, builder);
} else {
// non repeated field
handleNonRepeatedField(
record,
valueAsMap,
fieldPath,
messageTypeToExtensionMap,
defaultValueMap,
desc,
f,
builder);
}
}
// if record has unknown fields for this field path, handle it
try {
handleUnknownFields(record, fieldPath, builder);
} catch (IOException e) {
throw new DataGeneratorException(Errors.PROTOBUF_05, e.toString(), e);
}
return builder.build();
}
/**
* Creates an SDC Record Field from the provided protobuf message and descriptor.
*
* @param record record to be augmented
* @param fieldPath field path in the record to insert new Field
* @param fieldDescriptor descriptor for this message
* @param messageTypeToExtensionMap protobuf type extensions
* @param message protobuf message to decode
* @return reference to the Field added to the record.
* @throws DataParserException
*/
@SuppressWarnings("unchecked")
private static Field createField(
Record record,
String fieldPath,
Descriptors.FieldDescriptor fieldDescriptor,
Map<String, Set<Descriptors.FieldDescriptor>> messageTypeToExtensionMap,
Object message)
throws DataParserException {
Field newField;
if (message == null) {
// If the message does not contain required fields then builder.build() throws
// UninitializedMessageException
Object defaultValue = null;
// get default values only for optional fields and non-message types
if (fieldDescriptor.isOptional()
&& fieldDescriptor.getJavaType() != Descriptors.FieldDescriptor.JavaType.MESSAGE) {
defaultValue = fieldDescriptor.getDefaultValue();
}
newField = Field.create(getFieldType(fieldDescriptor.getJavaType()), defaultValue);
} else if (fieldDescriptor.isMapField()) {
// Map entry (protobuf 3 map)
Map<String, Field> sdcMapFieldValues = new HashMap<>();
Collection<DynamicMessage> mapEntries = (Collection<DynamicMessage>) message;
// MapEntry
for (DynamicMessage dynamicMessage : mapEntries) {
// MapEntry has 2 fields, key and value
Map<Descriptors.FieldDescriptor, Object> kv = dynamicMessage.getAllFields();
String key = null;
Object value = null;
Descriptors.FieldDescriptor valueDescriptor = null;
for (Map.Entry<Descriptors.FieldDescriptor, Object> entry : kv.entrySet()) {
switch (entry.getKey().getName()) {
case KEY:
key = entry.getValue().toString();
break;
case VALUE:
value = entry.getValue();
valueDescriptor = entry.getKey();
break;
default:
throw new DataParserException(Errors.PROTOBUF_09, entry.getKey().getName());
}
}
if (key != null && valueDescriptor != null) {
sdcMapFieldValues.put(
key,
createSdcField(record, fieldPath, valueDescriptor, messageTypeToExtensionMap, value));
}
}
newField = Field.create(sdcMapFieldValues);
} else if (fieldDescriptor.isRepeated()) {
// List entry (repeated)
List<?> list = (List<?>) message;
List<Field> listField = new ArrayList<>();
for (int i = 0; i < list.size(); i++) {
if (fieldDescriptor.getJavaType() == Descriptors.FieldDescriptor.JavaType.MESSAGE) {
listField.add(
protobufToSdcField(
record,
fieldPath + "[" + i + "]",
fieldDescriptor.getMessageType(),
messageTypeToExtensionMap,
list.get(i)));
} else {
listField.add(
createSdcField(
record,
fieldPath + "[" + i + "]",
fieldDescriptor,
messageTypeToExtensionMap,
list.get(i)));
}
}
newField = Field.create(listField);
} else {
// normal entry
newField =
createSdcField(record, fieldPath, fieldDescriptor, messageTypeToExtensionMap, message);
}
return newField;
}