public FieldBridge getFieldBridge(String type, String propertyPath) {
Descriptors.Descriptor md = serCtx.getMessageDescriptor(type);
Descriptors.FieldDescriptor fd = getFieldDescriptor(md, propertyPath);
switch (fd.getType()) {
case DOUBLE:
return new NullEncodingDoubleNumericFieldBridge(NULL_TOKEN);
case FLOAT:
return new NullEncodingFloatNumericFieldBridge(NULL_TOKEN);
case INT64:
case UINT64:
case FIXED64: