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      1 // Copyright 2016 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 #ifndef MOJO_PUBLIC_CPP_BINDINGS_MAP_DATA_VIEW_H_
      6 #define MOJO_PUBLIC_CPP_BINDINGS_MAP_DATA_VIEW_H_
      7 
      8 #include "base/logging.h"
      9 #include "mojo/public/cpp/bindings/array_data_view.h"
     10 #include "mojo/public/cpp/bindings/lib/bindings_internal.h"
     11 #include "mojo/public/cpp/bindings/lib/map_data_internal.h"
     12 #include "mojo/public/cpp/bindings/lib/serialization_context.h"
     13 #include "mojo/public/cpp/bindings/lib/serialization_forward.h"
     14 
     15 namespace mojo {
     16 
     17 template <typename K, typename V>
     18 class MapDataView {
     19  public:
     20   using Data_ = typename internal::MojomTypeTraits<MapDataView<K, V>>::Data;
     21 
     22   MapDataView() {}
     23 
     24   MapDataView(Data_* data, internal::SerializationContext* context)
     25       : keys_(data ? data->keys.Get() : nullptr, context),
     26         values_(data ? data->values.Get() : nullptr, context) {}
     27 
     28   bool is_null() const {
     29     DCHECK_EQ(keys_.is_null(), values_.is_null());
     30     return keys_.is_null();
     31   }
     32 
     33   size_t size() const {
     34     DCHECK_EQ(keys_.size(), values_.size());
     35     return keys_.size();
     36   }
     37 
     38   ArrayDataView<K>& keys() { return keys_; }
     39   const ArrayDataView<K>& keys() const { return keys_; }
     40 
     41   template <typename U>
     42   bool ReadKeys(U* output) {
     43     return internal::Deserialize<ArrayDataView<K>>(keys_.data_, output,
     44                                                    keys_.context_);
     45   }
     46 
     47   ArrayDataView<V>& values() { return values_; }
     48   const ArrayDataView<V>& values() const { return values_; }
     49 
     50   template <typename U>
     51   bool ReadValues(U* output) {
     52     return internal::Deserialize<ArrayDataView<V>>(values_.data_, output,
     53                                                    values_.context_);
     54   }
     55 
     56  private:
     57   ArrayDataView<K> keys_;
     58   ArrayDataView<V> values_;
     59 };
     60 
     61 }  // namespace mojo
     62 
     63 #endif  // MOJO_PUBLIC_CPP_BINDINGS_MAP_DATA_VIEW_H_
     64