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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/bindings/v8/OwnHandle.h | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/bindings/v8/OwnHandle.h')
-rw-r--r-- | Source/WebCore/bindings/v8/OwnHandle.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/Source/WebCore/bindings/v8/OwnHandle.h b/Source/WebCore/bindings/v8/OwnHandle.h new file mode 100644 index 0000000..17c551c --- /dev/null +++ b/Source/WebCore/bindings/v8/OwnHandle.h @@ -0,0 +1,80 @@ +/* + * 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 |