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      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
     91