Add chrome to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 92 insertions, 0 deletions

diff --git a/chrome/browser/history/visit_tracker.h b/chrome/browser/history/visit_tracker.h
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+// Copyright 2008, 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 CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
+#define CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__
+
+#include <list>
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/time.h"
+#include "chrome/browser/history/history_types.h"
+
+namespace history {
+
+// Tracks history transitions between pages. The history backend uses this to
+// link up page transitions to form a chain of page visits, and to set the
+// transition type properly.
+//
+// This class is not thread safe.
+class VisitTracker {
+ public:
+  VisitTracker();
+  ~VisitTracker();
+
+  // Notifications -------------------------------------------------------------
+
+  void AddVisit(const void* host,
+                int32 page_id,
+                const GURL& url,
+                VisitID visit_id);
+
+  // When a RenderProcessHost is destroyed, we want to clear out our saved
+  // transitions/visit IDs for it.
+  void NotifyRenderProcessHostDestruction(const void* host);
+
+  // Querying ------------------------------------------------------------------
+
+  // Returns the visit ID for the transition given information about the visit
+  // supplied by the renderer. We will return 0 if there is no appropriate
+  // referring visit.
+  VisitID GetLastVisit(const void* host, int32 page_id, const GURL& url);
+
+ private:
+  struct Transition {
+    GURL url;          // URL that the event happened to.
+    int32 page_id;     // ID generated by the render process host.
+    VisitID visit_id;  // Visit ID generated by history.
+  };
+  typedef std::vector<Transition> TransitionList;
+  typedef std::map<const void*, TransitionList*> HostList;
+
+  // Expires oldish items in the given transition list. This keeps the list
+  // size small by removing items that are unlikely to be needed, which is
+  // important for GetReferrer which does brute-force searches of this list.
+  void CleanupTransitionList(TransitionList* transitions);
+
+  // Maps render view hosts to lists of recent transitions.
+  HostList hosts_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(VisitTracker);
+};
+
+}  // namespace history
+
+#endif  // CHROME_BROWSER_HISTORY_VISIT_TRACKER_H__