/**
* Assigns all fields in {@link JsonNode} instance to a {@link Builder}.
*
* @param builder the builder to be populated
* @param root the JSON object
* @return the original builder, populated with any fields that were discovered
*/
public static Builder toProto(final Builder builder, final JsonNode root) {
Descriptor type = builder.getDescriptorForType();
for (final FieldDescriptor fieldDesc : type.getFields()) {
final String attrName = fieldDesc.getName();
final JsonNode node = root.get(attrName);
if (node == null) {
continue;
}
if (node.isNull()) {
continue;
}
if (fieldDesc.isRepeated()) {
final Iterator<JsonNode> iter = node.getElements();
while (iter.hasNext()) {
builder.addRepeatedField(fieldDesc, toJavaObj(builder, fieldDesc, iter.next()));
}
} else {
builder.setField(fieldDesc, toJavaObj(builder, fieldDesc, node));
}
}
return builder;
}
