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/*
* Copyright (C) 2014 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 V8PersistentValueMap_h
#define V8PersistentValueMap_h
#include "wtf/HashMap.h"
#include <v8-util.h>
#include <v8.h>
namespace blink {
/**
* A Traits class for v8::PersistentValueMap that uses wtf/HashMap as a
* backing store.
*
* The parameter is_weak will determine whether the references are 'weak'.
* If so, entries will be removed from the map as the weak references are
* collected.
*/
template<class KeyType, class ValueType, bool is_weak>
class V8PersistentValueMapTraits {
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 = is_weak ? v8::kWeak : v8::kNotWeak;
typedef v8::PersistentValueMap<KeyType, ValueType, V8PersistentValueMapTraits<KeyType, ValueType, is_weak> > MapType;
typedef void WeakCallbackDataType;
static WeakCallbackDataType* WeakCallbackParameter(MapType* map, KeyType key, const v8::Local<ValueType>& value)
{
return 0;
}
static void DisposeCallbackData(WeakCallbackDataType* callbackData)
{
}
static MapType* MapFromWeakCallbackData(
const v8::WeakCallbackData<ValueType, WeakCallbackDataType>& data)
{
return 0;
}
static KeyType KeyFromWeakCallbackData(
const v8::WeakCallbackData<ValueType, WeakCallbackDataType>& data)
{
return KeyType();
}
// Dispose traits:
static void Dispose(v8::Isolate* isolate, v8::UniquePersistent<ValueType> value, KeyType key) { }
};
/**
* A map for safely storing persistent V8 values, based on
* v8::PersistentValueMap.
*
* If is_weak is set, values will be held weakly and map entries will be
* removed as their values are being collected.
*/
template<class KeyType, class ValueType, bool is_weak = true>
class V8PersistentValueMap : public v8::PersistentValueMap<KeyType, ValueType, V8PersistentValueMapTraits<KeyType, ValueType, is_weak> > {
public:
typedef V8PersistentValueMapTraits<KeyType, ValueType, is_weak> Traits;
explicit V8PersistentValueMap(v8::Isolate* isolate) : v8::PersistentValueMap<KeyType, ValueType, Traits>(isolate) { }
};
} // namespace blink
#endif // V8PersistentValueMap_h
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