mojo/public/cpp/bindings/map_data_view.h

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MOJO_PUBLIC_CPP_BINDINGS_MAP_DATA_VIEW_H_
#define MOJO_PUBLIC_CPP_BINDINGS_MAP_DATA_VIEW_H_

#include "base/check_op.h"
#include "mojo/public/cpp/bindings/array_data_view.h"
#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
#include "mojo/public/cpp/bindings/lib/map_data_internal.h"
#include "mojo/public/cpp/bindings/lib/serialization_forward.h"

namespace mojo {

class Message;

template <typename K, typename V>
class MapDataView {
 public:
  using Data_ = typename internal::MojomTypeTraits<MapDataView<K, V>>::Data;

  MapDataView() {}

  MapDataView(Data_* data, Message* message)
      : keys_(data ? data->keys.Get() : nullptr, message),
        values_(data ? data->values.Get() : nullptr, message) {}

  bool is_null() const {
    DCHECK_EQ(keys_.is_null(), values_.is_null());
    return keys_.is_null();
  }

  size_t size() const {
    DCHECK_EQ(keys_.size(), values_.size());
    return keys_.size();
  }

  ArrayDataView<K>& keys() { return keys_; }
  const ArrayDataView<K>& keys() const { return keys_; }

  template <typename U>
  bool ReadKeys(U* output) {
    return internal::Deserialize<ArrayDataView<K>>(keys_.data_, output,
                                                   keys_.message_);
  }

  ArrayDataView<V>& values() { return values_; }
  const ArrayDataView<V>& values() const { return values_; }

  template <typename U>
  bool ReadValues(U* output) {
    return internal::Deserialize<ArrayDataView<V>>(values_.data_, output,
                                                   values_.message_);
  }

 private:
  ArrayDataView<K> keys_;
  ArrayDataView<V> values_;
};

}  // namespace mojo

#endif  // MOJO_PUBLIC_CPP_BINDINGS_MAP_DATA_VIEW_H_