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_TRAITS_WTF_HASH_MAP_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_WTF_HASH_MAP_H_ 7 8 #include "base/logging.h" 9 #include "mojo/public/cpp/bindings/map_traits.h" 10 #include "third_party/blink/renderer/platform/wtf/hash_map.h" 11 12 namespace mojo { 13 14 template <typename K, typename V> 15 struct MapTraits<WTF::HashMap<K, V>> { 16 using Key = K; 17 using Value = V; 18 using Iterator = typename WTF::HashMap<K, V>::iterator; 19 using ConstIterator = typename WTF::HashMap<K, V>::const_iterator; 20 21 static bool IsNull(const WTF::HashMap<K, V>& input) { 22 // WTF::HashMap<> is always converted to non-null mojom map. 23 return false; 24 } 25 26 static void SetToNull(WTF::HashMap<K, V>* output) { 27 // WTF::HashMap<> doesn't support null state. Set it to empty instead. 28 output->clear(); 29 } 30 31 static size_t GetSize(const WTF::HashMap<K, V>& input) { 32 return input.size(); 33 } 34 35 static ConstIterator GetBegin(const WTF::HashMap<K, V>& input) { 36 return input.begin(); 37 } 38 static Iterator GetBegin(WTF::HashMap<K, V>& input) { return input.begin(); } 39 40 static void AdvanceIterator(ConstIterator& iterator) { ++iterator; } 41 static void AdvanceIterator(Iterator& iterator) { ++iterator; } 42 43 static const K& GetKey(Iterator& iterator) { return iterator->key; } 44 static const K& GetKey(ConstIterator& iterator) { return iterator->key; } 45 46 static V& GetValue(Iterator& iterator) { return iterator->value; } 47 static const V& GetValue(ConstIterator& iterator) { return iterator->value; } 48 49 template <typename IK, typename IV> 50 static bool Insert(WTF::HashMap<K, V>& input, IK&& key, IV&& value) { 51 if (!WTF::HashMap<K, V>::IsValidKey(key)) { 52 LOG(ERROR) << "The key value is disallowed by WTF::HashMap"; 53 return false; 54 } 55 input.insert(std::forward<IK>(key), std::forward<IV>(value)); 56 return true; 57 } 58 59 static void SetToEmpty(WTF::HashMap<K, V>* output) { output->clear(); } 60 }; 61 62 } // namespace mojo 63 64 #endif // MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_WTF_HASH_MAP_H_ 65
