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      1 /*
      2  * Copyright (C) 2013 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 ScriptPromise_h
     32 #define ScriptPromise_h
     33 
     34 #include "bindings/v8/ScopedPersistent.h"
     35 #include "bindings/v8/ScriptValue.h"
     36 #include "bindings/v8/V8ScriptRunner.h"
     37 #include <v8.h>
     38 
     39 namespace WebCore {
     40 
     41 class ExecutionContext;
     42 
     43 // ScriptPromise is the class for representing Promise values in C++ world.
     44 // ScriptPromise holds a Promise.
     45 // So holding a ScriptPromise as a member variable in DOM object causes
     46 // memory leaks since it has a reference from C++ to V8.
     47 //
     48 class ScriptPromise {
     49 public:
     50     // Constructs an empty promise.
     51     ScriptPromise()
     52         : m_promise()
     53     {
     54     }
     55 
     56     explicit ScriptPromise(const ScriptValue& promise)
     57         : m_promise(promise)
     58     {
     59         ASSERT(!m_promise.hasNoValue());
     60     }
     61 
     62     ScriptPromise(v8::Handle<v8::Value> promise, v8::Isolate* isolate)
     63         : m_promise(promise, isolate)
     64     {
     65         ASSERT(!m_promise.hasNoValue());
     66     }
     67 
     68     bool isObject() const
     69     {
     70         return m_promise.isObject();
     71     }
     72 
     73     bool isNull() const
     74     {
     75         return m_promise.isNull();
     76     }
     77 
     78     bool isUndefinedOrNull() const
     79     {
     80         return m_promise.isUndefined() || m_promise.isNull();
     81     }
     82 
     83     v8::Handle<v8::Value> v8Value() const
     84     {
     85         return m_promise.v8Value();
     86     }
     87 
     88     v8::Isolate* isolate() const
     89     {
     90         return m_promise.isolate();
     91     }
     92 
     93     bool hasNoValue() const
     94     {
     95         return m_promise.hasNoValue();
     96     }
     97 
     98     void clear()
     99     {
    100         m_promise.clear();
    101     }
    102 
    103     static ScriptPromise createPending();
    104     static ScriptPromise createPending(ExecutionContext*);
    105 
    106 private:
    107     ScriptValue m_promise;
    108 };
    109 
    110 } // namespace WebCore
    111 
    112 
    113 #endif // ScriptPromise_h
    114