text: /*
   * Copyright (C) 2007 Apple 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:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 History_h
  #define History_h
  
  #include "base/gtest_prod_util.h"
  #include "bindings/core/v8/ScriptWrappable.h"
  #include "bindings/core/v8/SerializedScriptValue.h"
  #include "core/loader/FrameLoaderTypes.h"
  #include "core/frame/DOMWindowProperty.h"
  #include "platform/heap/Handle.h"
  #include "wtf/Forward.h"
  
  namespace blink {
  
  class LocalFrame;
  class KURL;
  class ExecutionContext;
  class ExceptionState;
  class SecurityOrigin;
  
  class CORE_EXPORT History final : public GarbageCollectedFinalized<History>, public ScriptWrappable, public DOMWindowProperty {
      DEFINE_WRAPPERTYPEINFO();
      USING_GARBAGE_COLLECTED_MIXIN(History);
  public:
      static History* create(LocalFrame* frame)
      {
          return new History(frame);
      }
  
      unsigned length() const;
      SerializedScriptValue* state();
  
      void back(ExecutionContext*);
      void forward(ExecutionContext*);
      void go(ExecutionContext*, int delta);
  
      void pushState(PassRefPtr<SerializedScriptValue> data, const String& title, const String& url, ExceptionState& exceptionState)
      {
          stateObjectAdded(data, title, url, scrollRestorationInternal(), FrameLoadTypeStandard, exceptionState);
      }
  
      void replaceState(PassRefPtr<SerializedScriptValue> data, const String& title, const String& url, ExceptionState& exceptionState)
      {
          stateObjectAdded(data, title, url, scrollRestorationInternal(), FrameLoadTypeReplaceCurrentItem, exceptionState);
      }
  
      void setScrollRestoration(const String& value);
      String scrollRestoration();
  
      bool stateChanged() const;
      bool isSameAsCurrentState(SerializedScriptValue*) const;
  
  
      DECLARE_VIRTUAL_TRACE();
  
  private:
      FRIEND_TEST_ALL_PREFIXES(HistoryTest, CanChangeToURL);
      FRIEND_TEST_ALL_PREFIXES(HistoryTest, CanChangeToURLInFileOrigin);
      FRIEND_TEST_ALL_PREFIXES(HistoryTest, CanChangeToURLInUniqueOrigin);
  
      explicit History(LocalFrame*);
  
      static bool canChangeToUrl(const KURL&, SecurityOrigin*, const KURL& documentURL);
  
      KURL urlForState(const String& url);
  
      void stateObjectAdded(PassRefPtr<SerializedScriptValue>, const String& title, const String& url, HistoryScrollRestorationType, FrameLoadType, ExceptionState&);
      SerializedScriptValue* stateInternal() const;
      HistoryScrollRestorationType scrollRestorationInternal() const;
  
      RefPtr<SerializedScriptValue> m_lastStateObjectRequested;
  };
  
  } // namespace blink
  
  #endif // History_h
  