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 V8EventListenerList_h
32#define V8EventListenerList_h
33
34#include "V8EventListener.h"
35#include "V8HiddenPropertyName.h"
36
37#include <v8.h>
38#include <wtf/PassRefPtr.h>
39
40namespace WebCore {
41    class Frame;
42
43    // This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups.
44    class V8EventListenerList {
45    public:
46        static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, bool isAttribute)
47        {
48            ASSERT(v8::Context::InContext());
49            if (!value->IsObject())
50                return 0;
51
52            v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute);
53            return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty);
54        }
55
56        template<typename WrapperType>
57        static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute);
58
59        static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute)
60        {
61            v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute);
62            listenerObject->DeleteHiddenValue(wrapperProperty);
63        }
64
65    private:
66        static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty)
67        {
68            ASSERT(v8::Context::InContext());
69            v8::HandleScope scope;
70            v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty);
71            if (listener.IsEmpty())
72                return 0;
73            return static_cast<V8EventListener*>(v8::External::Unwrap(listener));
74        }
75
76        static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute)
77        {
78            return isAttribute ? V8HiddenPropertyName::attributeListener() : V8HiddenPropertyName::listener();
79        }
80    };
81
82    template<typename WrapperType>
83    PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute)
84    {
85        ASSERT(v8::Context::InContext());
86        if (!value->IsObject())
87            return 0;
88
89        v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value);
90        v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute);
91
92        V8EventListener* wrapper = doFindWrapper(object, wrapperProperty);
93        if (wrapper)
94            return wrapper;
95
96        PassRefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute, WorldContextHandle(UseCurrentWorld));
97        if (wrapperPtr)
98            object->SetHiddenValue(wrapperProperty, v8::External::Wrap(wrapperPtr.get()));
99
100        return wrapperPtr;
101    }
102
103} // namespace WebCore
104
105#endif // V8EventListenerList_h
106