text: /*
   * Copyright (C) 2012 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef DOMWrapperMap_h
  #define DOMWrapperMap_h
  
  #include "bindings/core/v8/WrapperTypeInfo.h"
  #include "platform/ScriptForbiddenScope.h"
  #include "wtf/HashMap.h"
  #include <v8-util.h>
  #include <v8.h>
  
  namespace blink {
  
  template<class KeyType>
  class DOMWrapperMap {
  public:
      explicit DOMWrapperMap(v8::Isolate* isolate)
          : m_isolate(isolate)
          , m_map(isolate)
      {
      }
  
      v8::Local<v8::Object> newLocal(v8::Isolate* isolate, KeyType* key)
      {
          return m_map.Get(key);
      }
  
      bool setReturnValueFrom(v8::ReturnValue<v8::Value> returnValue, KeyType* key)
      {
          return m_map.SetReturnValue(key, returnValue);
      }
  
      void setReference(v8::Isolate* isolate, const v8::Persistent<v8::Object>& parent, KeyType* key)
      {
          m_map.SetReference(key, parent);
      }
  
      bool containsKey(KeyType* key)
      {
          return m_map.Contains(key);
      }
  
      bool set(KeyType* key, const WrapperTypeInfo* wrapperTypeInfo, v8::Local<v8::Object>& wrapper) WARN_UNUSED_RETURN
      {
          if (UNLIKELY(containsKey(key))) {
              wrapper = newLocal(m_isolate, key);
              return false;
          }
          v8::Global<v8::Object> global(m_isolate, wrapper);
          wrapperTypeInfo->configureWrapper(&global);
          m_map.Set(key, global.Pass());
          return true;
      }
  
      void clear()
      {
          m_map.Clear();
      }
  
      void removeAndDispose(KeyType* key)
      {
          ASSERT(containsKey(key));
          m_map.Remove(key);
      }
  
  private:
      class PersistentValueMapTraits {
      public:
          // Map traits:
          typedef HashMap<KeyType*, v8::PersistentContainerValue> Impl;
          typedef typename Impl::iterator Iterator;
          static size_t Size(const Impl* impl) { return impl->size(); }
          static bool Empty(Impl* impl) { return impl->isEmpty(); }
          static void Swap(Impl& impl, Impl& other) { impl.swap(other); }
          static Iterator Begin(Impl* impl) { return impl->begin(); }
          static Iterator End(Impl* impl) { return impl->end(); }
          static v8::PersistentContainerValue Value(Iterator& iter)
          {
              return iter->value;
          }
          static KeyType* Key(Iterator& iter) { return iter->key; }
          static v8::PersistentContainerValue Set(
              Impl* impl, KeyType* key, v8::PersistentContainerValue value)
          {
              v8::PersistentContainerValue oldValue = Get(impl, key);
              impl->set(key, value);
              return oldValue;
          }
          static v8::PersistentContainerValue Get(const Impl* impl, KeyType* key)
          {
              return impl->get(key);
          }
  
          static v8::PersistentContainerValue Remove(Impl* impl, KeyType* key)
          {
              return impl->take(key);
          }
  
          // Weak traits:
          static const v8::PersistentContainerCallbackType kCallbackType = v8::kWeakWithInternalFields;
          typedef v8::GlobalValueMap<KeyType*, v8::Object, PersistentValueMapTraits> MapType;
          typedef MapType WeakCallbackDataType;
  
          static WeakCallbackDataType* WeakCallbackParameter(MapType* map, KeyType* key, v8::Local<v8::Object>& value)
          {
              return map;
          }
  
          static void DisposeCallbackData(WeakCallbackDataType* callbackData) { }
  
          static MapType* MapFromWeakCallbackInfo(const v8::WeakCallbackInfo<WeakCallbackDataType>& data)
          {
              return data.GetParameter();
          }
  
          static KeyType* KeyFromWeakCallbackInfo(const v8::WeakCallbackInfo<WeakCallbackDataType>& data)
          {
              return reinterpret_cast<KeyType*>(data.GetInternalField(v8DOMWrapperObjectIndex));
          }
  
          static void OnWeakCallback(const v8::WeakCallbackInfo<WeakCallbackDataType>& data) { }
  
          static void Dispose(v8::Isolate* isolate, v8::Global<v8::Object> value, KeyType* key) { }
  
          static void DisposeWeak(const v8::WeakCallbackInfo<WeakCallbackDataType>& data)
          {
              void* internalFields[v8::kInternalFieldsInWeakCallback] = {
                  data.GetInternalField(0),
                  data.GetInternalField(1)
              };
              DisposeWeak(data.GetIsolate(), internalFields, KeyFromWeakCallbackInfo(data));
          }
          static void DisposeWeak(v8::Isolate* isolate, void* internalFields[v8::kInternalFieldsInWeakCallback], KeyType* key) { }
      };
  
      v8::Isolate* m_isolate;
      typename PersistentValueMapTraits::MapType m_map;
  };
  
  } // namespace blink
  
  #endif // DOMWrapperMap_h
  