UnknownFieldSchema.java

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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package com.google.protobuf;
 
import java.io.IOException;
 
@ExperimentalApi
abstract class UnknownFieldSchema<T, B> {
 
  abstract boolean shouldDiscardUnknownFields(Reader reader);
 
  abstract void addVarint(B fields, int number, long value);
 
  abstract void addFixed32(B fields, int number, int value);
 
  abstract void addFixed64(B fields, int number, long value);
 
  abstract void addLengthDelimited(B fields, int number, ByteString value);
 
  abstract void addGroup(B fields, int number, T subFieldSet);
 
  abstract B newBuilder();
 
  abstract T toImmutable(B fields);
 
  abstract void setToMessage(Object message, T fields);
 
  abstract T getFromMessage(Object message);
 
  abstract B getBuilderFromMessage(Object message);
 
  abstract void setBuilderToMessage(Object message, B builder);
 
  abstract void makeImmutable(Object message);
 
  final boolean mergeOneFieldFrom(B unknownFields, Reader reader) throws IOException {
    int tag = reader.getTag();
    int fieldNumber = WireFormat.getTagFieldNumber(tag);
    switch (WireFormat.getTagWireType(tag)) {
      case WireFormat.WIRETYPE_VARINT:
        addVarint(unknownFields, fieldNumber, reader.readInt64());
        return true;
      case WireFormat.WIRETYPE_FIXED32:
        addFixed32(unknownFields, fieldNumber, reader.readFixed32());
        return true;
      case WireFormat.WIRETYPE_FIXED64:
        addFixed64(unknownFields, fieldNumber, reader.readFixed64());
        return true;
      case WireFormat.WIRETYPE_LENGTH_DELIMITED:
        addLengthDelimited(unknownFields, fieldNumber, reader.readBytes());
        return true;
      case WireFormat.WIRETYPE_START_GROUP:
        final B subFields = newBuilder();
        int endGroupTag = WireFormat.makeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP);
        mergeFrom(subFields, reader);
        if (endGroupTag != reader.getTag()) {
          throw InvalidProtocolBufferException.invalidEndTag();
        }
        addGroup(unknownFields, fieldNumber, toImmutable(subFields));
        return true;
      case WireFormat.WIRETYPE_END_GROUP:
        return false;
      default:
        throw InvalidProtocolBufferException.invalidWireType();
    }
  }
 
  final void mergeFrom(B unknownFields, Reader reader) throws IOException {
    while (true) {
      if (reader.getFieldNumber() == Reader.READ_DONE
          || !mergeOneFieldFrom(unknownFields, reader)) {
        break;
      }
    }
  }
 
  abstract void writeTo(T unknownFields, Writer writer) throws IOException;
 
  abstract void writeAsMessageSetTo(T unknownFields, Writer writer) throws IOException;
 
  abstract T merge(T destination, T source);
 
  abstract int getSerializedSizeAsMessageSet(T message);
 
  abstract int getSerializedSize(T unknowns);
}