Class GeneratedMessage.ExtendableBuilder<MessageT extends GeneratedMessage.ExtendableMessage<MessageT>, BuilderT extends GeneratedMessage.ExtendableBuilder<MessageT,BuilderT>>

java.lang.Object
com.google.protobuf.AbstractMessageLite.Builder
com.google.protobuf.AbstractMessage.Builder<BuilderT>
com.google.protobuf.GeneratedMessage.Builder<BuilderT>
com.google.protobuf.GeneratedMessage.ExtendableBuilder<MessageT,BuilderT>
All Implemented Interfaces:
GeneratedMessage.ExtendableMessageOrBuilder<MessageT>, Message.Builder, MessageLite.Builder, MessageLiteOrBuilder, MessageOrBuilder, Cloneable
Direct Known Subclasses:
GeneratedMessageV3.Builder
Enclosing class:
GeneratedMessage
public abstract static class GeneratedMessage.ExtendableBuilder<MessageT extends GeneratedMessage.ExtendableMessage<MessageT>, BuilderT extends GeneratedMessage.ExtendableBuilder<MessageT,BuilderT>> extends GeneratedMessage.Builder<BuilderT> implements GeneratedMessage.ExtendableMessageOrBuilder<MessageT>
Generated message builders for message types that contain extension ranges subclass this.

This class implements type-safe accessors for extensions. They implement all the same operations that you can do with normal fields -- e.g. "get", "set", and "add" -- but for extensions. The extensions are identified using instances of the class GeneratedMessage.GeneratedExtension; the protocol compiler generates a static instance of this class for every extension in its input. Through the magic of generics, all is made type-safe.

For example, imagine you have the .proto file: 

option java_class = "MyProto";

message Foo {
  extensions 1000 to max;
}

extend Foo {
  optional int32 bar;
}

Then you might write code like: 

MyProto.Foo foo =
  MyProto.Foo.newBuilder()
    .setExtension(MyProto.bar, 123)
    .build();

See also GeneratedMessage.ExtendableMessage.