/*

 * Copyright (C) 2008, 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 ScriptValue_h

#define ScriptValue_h

#include "PlatformString.h"

#include "ScriptState.h"

#include <v8.h>

#include <wtf/PassRefPtr.h>

#ifndef NDEBUG

#include "V8Proxy.h"  // for register and unregister global handles.

#endif

namespace WebCore {

class SerializedScriptValue;

class ScriptValue {

public:

    ScriptValue() {}

    ScriptValue(v8::Handle<v8::Value> value) 

    {

        if (value.IsEmpty())

            return;

        m_value = v8::Persistent<v8::Value>::New(value);

#ifndef NDEBUG

        V8GCController::registerGlobalHandle(SCRIPTVALUE, this, m_value);

#endif

    }

    ScriptValue(const ScriptValue& value) 

    {

        if (value.m_value.IsEmpty())

            return;

        m_value = v8::Persistent<v8::Value>::New(value.m_value);

#ifndef NDEBUG

        V8GCController::registerGlobalHandle(SCRIPTVALUE, this, m_value);

#endif

    }

    ScriptValue& operator=(const ScriptValue& value) 

    {

        if (this == &value) 

            return *this;

        clear();

        if (value.m_value.IsEmpty())

            return *this;

        m_value = v8::Persistent<v8::Value>::New(value.m_value);

#ifndef NDEBUG

        V8GCController::registerGlobalHandle(SCRIPTVALUE, this, m_value);

#endif

        return *this;

    }

    bool operator==(const ScriptValue value) const

    {

        return m_value == value.m_value;

    }

    bool isEqual(ScriptState*, const ScriptValue& value) const

    {

        return m_value == value.m_value;

    }

    bool operator!=(const ScriptValue value) const

    {

        return !operator==(value);

    }

    bool isNull() const

    {

        return m_value->IsNull();

    }

    bool isUndefined() const

    {

        return m_value->IsUndefined();

    }

    bool isObject() const

    {

        return m_value->IsObject();

    }

    bool hasNoValue() const

    {

        return m_value.IsEmpty();

    }

    PassRefPtr<SerializedScriptValue> serialize(ScriptState*);

    static ScriptValue deserialize(ScriptState*, SerializedScriptValue*);

    static ScriptValue undefined() { return ScriptValue(v8::Undefined()); }

    void clear()

    {

        if (m_value.IsEmpty())

            return;

#ifndef NDEBUG

        V8GCController::unregisterGlobalHandle(this, m_value);

#endif

        m_value.Dispose();

        m_value.Clear();

    }

    virtual ~ScriptValue() 

    {

        clear();

    }

    v8::Handle<v8::Value> v8Value() const { return m_value; }

    bool getString(ScriptState*, String& result) const { return getString(result); }

    bool getString(String& result) const;

    String toString(ScriptState*) const;

private:

    mutable v8::Persistent<v8::Value> m_value;

};

} // namespace WebCore

#endif // ScriptValue_h