Introduce a layering in the invalidation component as public and impl

components/invalidation/ack_handle.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/ack_handle.h"
-
-#include <cstddef>
-#include "base/rand_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/values.h"
-
-namespace syncer {
-
-namespace {
-// Hopefully enough bytes for uniqueness.
-const size_t kBytesInHandle = 16;
-}  // namespace
-
-AckHandle AckHandle::CreateUnique() {
-  // This isn't a valid UUID, so we don't attempt to format it like one.
-  uint8 random_bytes[kBytesInHandle];
-  base::RandBytes(random_bytes, sizeof(random_bytes));
-  return AckHandle(base::HexEncode(random_bytes, sizeof(random_bytes)),
-                   base::Time::Now());
-}
-
-AckHandle AckHandle::InvalidAckHandle() {
-  return AckHandle(std::string(), base::Time());
-}
-
-bool AckHandle::Equals(const AckHandle& other) const {
-  return state_ == other.state_ && timestamp_ == other.timestamp_;
-}
-
-scoped_ptr<base::DictionaryValue> AckHandle::ToValue() const {
-  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
-  value->SetString("state", state_);
-  value->SetString("timestamp",
-                   base::Int64ToString(timestamp_.ToInternalValue()));
-  return value.Pass();
-}
-
-bool AckHandle::ResetFromValue(const base::DictionaryValue& value) {
-  if (!value.GetString("state", &state_))
-    return false;
-  std::string timestamp_as_string;
-  if (!value.GetString("timestamp", &timestamp_as_string))
-    return false;
-  int64 timestamp_value;
-  if (!base::StringToInt64(timestamp_as_string, &timestamp_value))
-    return false;
-  timestamp_ = base::Time::FromInternalValue(timestamp_value);
-  return true;
-}
-
-bool AckHandle::IsValid() const {
-  return !state_.empty();
-}
-
-AckHandle::AckHandle(const std::string& state, base::Time timestamp)
-    : state_(state), timestamp_(timestamp) {
-}
-
-AckHandle::~AckHandle() {
-}
-
-}  // namespace syncer