| /* |
| * Copyright (C) 2009 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 OwnHandle_h |
| #define OwnHandle_h |
| |
| #include <v8.h> |
| |
| namespace WebCore { |
| |
| template<typename T> |
| class OwnHandle { |
| public: |
| OwnHandle() { } |
| explicit OwnHandle(v8::Handle<T> handle) : m_handle(v8::Persistent<T>::New(handle)) { } |
| ~OwnHandle() { clear(); } |
| |
| v8::Handle<T> get() const { return m_handle; } |
| void set(v8::Handle<T> handle) { clear(); m_handle = v8::Persistent<T>::New(handle); } |
| |
| // Note: This is clear in the OwnPtr sense, not the v8::Handle sense. |
| void clear() |
| { |
| if (m_handle.IsEmpty()) |
| return; |
| if (m_handle.IsWeak()) |
| m_handle.ClearWeak(); |
| m_handle.Dispose(); |
| m_handle.Clear(); |
| } |
| |
| // Make the underlying handle weak. The client doesn't get a callback, |
| // we just make the handle empty. |
| void makeWeak() |
| { |
| if (m_handle.IsEmpty()) |
| return; |
| m_handle.MakeWeak(this, &OwnHandle<T>::weakCallback); |
| } |
| |
| private: |
| static void weakCallback(v8::Persistent<v8::Value> object, void* ownHandle) |
| { |
| OwnHandle<T>* handle = static_cast<OwnHandle<T>*>(ownHandle); |
| handle->clear(); |
| } |
| |
| v8::Persistent<T> m_handle; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // OwnHandle_h |