/*

 * 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 V8DOMWindowShell_h

#define V8DOMWindowShell_h

#include "WrapperTypeInfo.h"

#include <wtf/HashMap.h>

#include <wtf/PassRefPtr.h>

#include <wtf/RefCounted.h>

#include <wtf/RefPtr.h>

namespace WebCore {

class DOMWindow;

class Frame;

class String;

// V8WindowShell represents all the per-global object state for a Frame that

// persist between navigations.

class V8DOMWindowShell : public RefCounted<V8DOMWindowShell> {

public:

    static PassRefPtr<V8DOMWindowShell> create(Frame*);

    v8::Handle<v8::Context> context() const { return m_context; }

    // Update document object of the frame.

    void updateDocument();

    // Update the security origin of a document

    // (e.g., after setting docoument.domain).

    void updateSecurityOrigin();

    bool isContextInitialized();

    v8::Persistent<v8::Context> createNewContext(v8::Handle<v8::Object> global, int extensionGroup);

    void setContext(v8::Handle<v8::Context>);

    static bool installDOMWindow(v8::Handle<v8::Context> context, DOMWindow*);

    void initContextIfNeeded();

    void updateDocumentWrapper(v8::Handle<v8::Object> wrapper);

    void clearForNavigation();

    void clearForClose();

    void destroyGlobal();

    static v8::Handle<v8::Value> getHiddenObjectPrototype(v8::Handle<v8::Context>);

    // WARNING: Call |installHiddenObjectPrototype| only on fresh contexts!

    static bool installHiddenObjectPrototype(v8::Handle<v8::Context>);

    // To create JS Wrapper objects, we create a cache of a 'boiler plate'

    // object, and then simply Clone that object each time we need a new one.

    // This is faster than going through the full object creation process.

    v8::Local<v8::Object> createWrapperFromCache(WrapperTypeInfo* type)

    {

        v8::Persistent<v8::Object> boilerplate = m_wrapperBoilerplates.get(type);

        return boilerplate.IsEmpty() ? createWrapperFromCacheSlowCase(type) : boilerplate->Clone();

    }

    static void setLocation(DOMWindow*, const String& relativeURL);

private:

    V8DOMWindowShell(Frame*);

    void disposeContextHandles();

    void setSecurityToken();

    void clearDocumentWrapper();

    // The JavaScript wrapper for the document object is cached on the global

    // object for fast access. UpdateDocumentWrapperCache sets the wrapper

    // for the current document on the global object. ClearDocumentWrapperCache

    // deletes the document wrapper from the global object.

    void updateDocumentWrapperCache();

    void clearDocumentWrapperCache();

    v8::Local<v8::Object> createWrapperFromCacheSlowCase(WrapperTypeInfo*);

    Frame* m_frame;

    // For each possible type of wrapper, we keep a boilerplate object.

    // The boilerplate is used to create additional wrappers of the same type.

    typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Object> > WrapperBoilerplateMap;

    WrapperBoilerplateMap m_wrapperBoilerplates;

    v8::Persistent<v8::Context> m_context;

    v8::Persistent<v8::Object> m_global;

    v8::Persistent<v8::Object> m_document;

};

} // namespace WebCore

#endif // V8DOMWindowShell_h