Class GeneratedMessage.Builder<BuilderType> (3.19.4)

Called by the initialization and clear code paths to allow subclasses to reset any of their builtin fields back to the initial values.

TODO(jieluo): Clear it when all subclasses have implemented this method.

Clones the Builder.

Get a nested builder instance for the given field.

Normally, we hold a reference to the immutable message object for the message type field. Some implementations(the generated message builders), however, can also hold a reference to the builder object (a nested builder) for the field.

If the field is already backed up by a nested builder, the nested builder will be returned. Otherwise, a new field builder will be created and returned. The original message field (if exist) will be merged into the field builder, which will then be nested into its parent builder.

NOTE: implementations that do not support nested builders will throw UnsupportedOperationException.

TODO(jieluo): Clear it when all subclasses have implemented this method.

Gets the BuilderParent for giving to our children.

Get a nested builder instance for the given repeated field instance.

Normally, we hold a reference to the immutable message object for the message type field. Some implementations(the generated message builders), however, can also hold a reference to the builder object (a nested builder) for the field.

If the field is already backed up by a nested builder, the nested builder will be returned. Otherwise, a new field builder will be created and returned. The original message field (if exist) will be merged into the field builder, which will then be nested into its parent builder.

NOTE: implementations that do not support nested builders will throw UnsupportedOperationException.

TODO(jieluo): Clear it when all subclasses have implemented this method.

Get the FieldAccessorTable for this type. We can't have the message class pass this in to the constructor because of bootstrapping trouble with DescriptorProtos.

Gets the map field with the given field number. This method should be overridden in the generated message class if the message contains map fields.

Unlike other field types, reflection support for map fields can't be implemented based on generated public API because we need to access a map field as a list in reflection API but the generated API only allows us to access it as a map. This method returns the underlying map field directly and thus enables us to access the map field as a list.

Like #internalGetMapField but return a mutable version.

Gets whether invalidations are needed

Called by the subclass or a builder to notify us that a message was built and may be cached and therefore invalidations are needed.

Merge some unknown fields into the UnknownFieldSet for this message.

Called by the subclass when a message is built.

Called when a the builder or one of its nested children has changed and any parent should be notified of its invalidation.

Called by subclasses to parse an unknown field.