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bind_context_info.h

// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_FRAME_BIND_CONTEXT_INFO_
#define CHROME_FRAME_BIND_CONTEXT_INFO_

#include <atlbase.h>
#include <atlcom.h>

#include "base/scoped_bstr_win.h"
#include "base/scoped_comptr_win.h"

class __declspec(uuid("71CC3EC7-7E8A-457f-93BC-1090CF31CC18"))
IBindContextInfoInternal : public IUnknown {
 public:
  STDMETHOD(GetCppObject)(void** me) = 0;
};

// This class maintains contextual information used by ChromeFrame.
// This information is maintained in the bind context.
// Association with GUID_NULL is for convenience.
class __declspec(uuid("00000000-0000-0000-0000-000000000000")) BindContextInfo
  : public CComObjectRootEx<CComMultiThreadModel>,
    public IBindContextInfoInternal {
 public:
  BindContextInfo();
  ~BindContextInfo();

  BEGIN_COM_MAP(BindContextInfo)
    COM_INTERFACE_ENTRY(IBindContextInfoInternal)
    COM_INTERFACE_ENTRY_AGGREGATE(IID_IMarshal, ftm_)
  END_COM_MAP()

  // Returns the BindContextInfo instance associated with the bind
  // context. Creates it if needed.
  // The returned info object will be AddRef-ed on return, so use
  // ScopedComPtr<>::Receive() to receive this pointer.
  static HRESULT FromBindContext(IBindCtx* bind_context,
                                 BindContextInfo** info);

  void set_chrome_request(bool chrome_request) {
    chrome_request_ = chrome_request;
  }

  bool chrome_request() const {
    return chrome_request_;
  }

  void set_no_cache(bool no_cache) {
    no_cache_ = no_cache;
  }

  bool no_cache() const {
    return no_cache_;
  }

  bool is_switching() const {
    return is_switching_;
  }

  void SetToSwitch(IStream* cache);

  IStream* cache() {
    return cache_;
  }

  // Accept a const wchar_t* to ensure that we don't have a reference
  // to someone else's buffer.
  void set_url(const wchar_t* url) {
    DCHECK(url);
    if (url) {
      url_ = url;
    } else {
      url_.clear();
    }
  }

  const std::wstring& url() const {
    return url_;
  }

 protected:
  STDMETHOD(GetCppObject)(void** me) {
    DCHECK(me);
    AddRef();
    *me = static_cast<BindContextInfo*>(this);
    return S_OK;
  }

  HRESULT Initialize(IBindCtx* bind_ctx);

 private:
  ScopedComPtr<IStream> cache_;
  bool no_cache_;
  bool chrome_request_;
  bool is_switching_;
  std::wstring url_;
  ScopedComPtr<IUnknown> ftm_;

  DISALLOW_COPY_AND_ASSIGN(BindContextInfo);
};

#endif  // CHROME_FRAME_BIND_CONTEXT_INFO_


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