Framework for iterating over certificates in CT database from Chromium code. (not for review)

net/tools/ct_mapper/visitor.h

Index: net/tools/ct_mapper/visitor.h
diff --git a/net/tools/ct_mapper/visitor.h b/net/tools/ct_mapper/visitor.h
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+// Copyright 2015 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 NET_TOOLS_CT_MAPPER_VISITOR_H_
+#define NET_TOOLS_CT_MAPPER_VISITOR_H_
+
+#include <map>
+#include <memory>
+
+#include "base/compiler_specific.h"
+#include "base/memory/ptr_util.h"
+
+namespace net {
+
+class Entry;
+class Metrics;
+
+class Visitor {
+ public:
+  virtual ~Visitor() {}
+  virtual void Start() {}
+  virtual void Visit(const Entry& entry, Metrics* metrics) = 0;
+  virtual void End() {}
+};
+
+class VisitorFactory {
+ public:
+  virtual ~VisitorFactory() {}
+  virtual std::unique_ptr<Visitor> Create() = 0;
+};
+
+}  // namespace net
+
+#endif  // NET_TOOLS_CT_MAPPER_VISITOR_H_