Introduce a layering in the invalidation component as public and impl

components/invalidation/invalidation_util.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "components/invalidation/invalidation_util.h"
-
-#include <ostream>
-#include <sstream>
-
-#include "base/json/json_writer.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/values.h"
-#include "components/invalidation/invalidation.h"
-#include "google/cacheinvalidation/include/types.h"
-#include "google/cacheinvalidation/types.pb.h"
-
-namespace syncer {
-
-bool ObjectIdLessThan::operator()(const invalidation::ObjectId& lhs,
-                                  const invalidation::ObjectId& rhs) const {
-  return (lhs.source() < rhs.source()) ||
-         (lhs.source() == rhs.source() && lhs.name() < rhs.name());
-}
-
-bool InvalidationVersionLessThan::operator()(const Invalidation& a,
-                                             const Invalidation& b) const {
-  DCHECK(a.object_id() == b.object_id())
-      << "a: " << ObjectIdToString(a.object_id()) << ", "
-      << "b: " << ObjectIdToString(a.object_id());
-
-  if (a.is_unknown_version() && !b.is_unknown_version())
-    return true;
-
-  if (!a.is_unknown_version() && b.is_unknown_version())
-    return false;
-
-  if (a.is_unknown_version() && b.is_unknown_version())
-    return false;
-
-  return a.version() < b.version();
-}
-
-scoped_ptr<base::DictionaryValue> ObjectIdToValue(
-    const invalidation::ObjectId& object_id) {
-  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
-  value->SetInteger("source", object_id.source());
-  value->SetString("name", object_id.name());
-  return value.Pass();
-}
-
-bool ObjectIdFromValue(const base::DictionaryValue& value,
-                       invalidation::ObjectId* out) {
-  *out = invalidation::ObjectId();
-  std::string name;
-  int source = 0;
-  if (!value.GetInteger("source", &source) || !value.GetString("name", &name)) {
-    return false;
-  }
-  *out = invalidation::ObjectId(source, name);
-  return true;
-}
-
-std::string ObjectIdToString(const invalidation::ObjectId& object_id) {
-  std::string str;
-  base::JSONWriter::Write(*ObjectIdToValue(object_id), &str);
-  return str;
-}
-
-}  // namespace syncer