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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef SharedPersistent_h
     32 #define SharedPersistent_h
     33 
     34 #include "bindings/v8/ScopedPersistent.h"
     35 #include <v8.h>
     36 #include "wtf/PassRefPtr.h"
     37 #include "wtf/RefCounted.h"
     38 
     39 namespace WebCore {
     40 
     41     template <typename T>
     42     class SharedPersistent : public RefCounted<SharedPersistent<T> > {
     43     WTF_MAKE_NONCOPYABLE(SharedPersistent);
     44     public:
     45         static PassRefPtr<SharedPersistent<T> > create(v8::Handle<T> value, v8::Isolate* isolate)
     46         {
     47             return adoptRef(new SharedPersistent<T>(value, isolate));
     48         }
     49 
     50         v8::Local<T> newLocal(v8::Isolate* isolate) const
     51         {
     52             return m_value.newLocal(isolate);
     53         }
     54 
     55         bool isEmpty() { return m_value.isEmpty(); }
     56 
     57         bool operator==(const SharedPersistent<T>& other)
     58         {
     59             return m_value == other.m_value;
     60         }
     61 
     62     private:
     63         explicit SharedPersistent(v8::Handle<T> value, v8::Isolate* isolate) : m_value(isolate, value) { }
     64         ScopedPersistent<T> m_value;
     65     };
     66 
     67 } // namespace WebCore
     68 
     69 #endif // SharedPersistent_h
     70