src/ios/consumer/base/supports_user_data.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ios/public/consumer/base/supports_user_data.h"
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/supports_user_data.h"
   9
  10 namespace ios {
  11
  12 // Class that wraps a ios::SupportsUserData::Data object in a
  13 // base::SupportsUserData::Data object. The wrapper object takes ownership of
  14 // the wrapped object and will delete it on destruction.
  15 class DataAdaptor : public base::SupportsUserData::Data {
  16  public:
  17   DataAdaptor(SupportsUserData::Data* data);
  18   virtual ~DataAdaptor();
  19
  20   SupportsUserData::Data* data() { return data_.get(); }
  21
  22  private:
  23   scoped_ptr<SupportsUserData::Data> data_;
  24 };
  25
  26 DataAdaptor::DataAdaptor(SupportsUserData::Data* data)
  27     : data_(data) {}
  28
  29 DataAdaptor::~DataAdaptor() {}
  30
  31 // Class that subclasses base::SupportsUserData in order to enable it to
  32 // support ios::SupportsUserData::Data objects. It accomplishes this by
  33 // wrapping these objects internally in ios::DataAdaptor objects.
  34 class SupportsUserDataInternal : public base::SupportsUserData {
  35  public:
  36   // Returns the data that is associated with |key|, or NULL if there is no
  37   // such associated data.
  38   ios::SupportsUserData::Data* GetIOSUserData(const void* key);
  39
  40   // Associates |data| with |key|. Takes ownership of |data| and will delete it
  41   // on either a call to |RemoveUserData(key)| or otherwise on destruction.
  42   void SetIOSUserData(const void* key, ios::SupportsUserData::Data* data);
  43
  44  private:
  45   SupportsUserDataInternal() {}
  46   virtual ~SupportsUserDataInternal() {}
  47
  48   friend class ios::SupportsUserData;
  49 };
  50
  51 ios::SupportsUserData::Data* SupportsUserDataInternal::GetIOSUserData(
  52     const void* key) {
  53   DataAdaptor* adaptor = static_cast<DataAdaptor*>(
  54       base::SupportsUserData::GetUserData(key));
  55   if (!adaptor)
  56     return NULL;
  57   return adaptor->data();
  58 }
  59
  60 void SupportsUserDataInternal::SetIOSUserData(
  61     const void* key, ios::SupportsUserData::Data* data) {
  62   base::SupportsUserData::SetUserData(key, new DataAdaptor(data));
  63 }
  64
  65 // ios::SupportsUserData implementation.
  66 SupportsUserData::SupportsUserData()
  67     : internal_helper_(new SupportsUserDataInternal()) {
  68 }
  69
  70 SupportsUserData::~SupportsUserData() {
  71   delete internal_helper_;
  72 }
  73
  74 SupportsUserData::Data* SupportsUserData::GetUserData(const void* key) const {
  75   return internal_helper_->GetIOSUserData(key);
  76 }
  77
  78 void SupportsUserData::SetUserData(const void* key, Data* data) {
  79   internal_helper_->SetIOSUserData(key, data);
  80 }
  81
  82 void SupportsUserData::RemoveUserData(const void* key) {
  83   internal_helper_->RemoveUserData(key);
  84 }
  85
  86 void SupportsUserData::DetachUserDataThread() {
  87   internal_helper_->DetachUserDataThread();
  88 }
  89
  90 }  // namespace ios