Set onc_source UI data parameter when importing ONC.

chrome/browser/chromeos/cros/enum_mapper.h

+// Copyright (c) 2011 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_BROWSER_CHROMEOS_CROS_ENUM_MAPPER_H_
+#define CHROME_BROWSER_CHROMEOS_CROS_ENUM_MAPPER_H_
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace chromeos {
+
+// This turns an array of string-to-enum-value mappings into a class
+// that can cache the mapping and do quick lookups using an actual map
+// class.  Usage is something like:
+//
+// const char kKey1[] = "key1";
+// const char kKey2[] = "key2";
+//
+// enum EnumFoo {
+//   UNKNOWN = 0,
+//   FOO = 1,
+//   BAR = 2,
+// };
+//
+// const EnumMapper<EnumFoo>::Pair index_table[] = {
+//   { kKey1, FOO },
+//   { kKey2, BAR },
+// };
+//
+// EnumMapper<EnumFoo> mapper(index_table, arraysize(index_table), UNKNOWN);
+// EnumFoo value = mapper.Get(kKey1);  // Returns FOO.
+// EnumFoo value = mapper.Get('boo');  // Returns UNKNOWN.
+template <typename EnumType>
+class EnumMapper {
+ public:
+  struct Pair {
+    const char* key;
+    const EnumType value;
+  };
+
+  EnumMapper(const Pair* list, size_t num_entries, EnumType unknown)
+      : unknown_value_(unknown) {
+    for (size_t i = 0; i < num_entries; ++i, ++list) {
+      enum_map_[list->key] = list->value;
+      inverse_enum_map_[list->value] = list->key;
+    }
+  }
+
+  EnumType Get(const std::string& type) const {
+    EnumMapConstIter iter = enum_map_.find(type);
+    if (iter != enum_map_.end())
+      return iter->second;
+    return unknown_value_;
+  }
+
+  std::string GetKey(EnumType type) const {
+    InverseEnumMapConstIter iter = inverse_enum_map_.find(type);
+    if (iter != inverse_enum_map_.end())
+      return iter->second;
+    return std::string();
+  }
+
+ private:
+  typedef typename std::map<std::string, EnumType> EnumMap;
+  typedef typename std::map<EnumType, std::string> InverseEnumMap;
+  typedef typename EnumMap::const_iterator EnumMapConstIter;
+  typedef typename InverseEnumMap::const_iterator InverseEnumMapConstIter;
+  EnumMap enum_map_;
+  InverseEnumMap inverse_enum_map_;
+  EnumType unknown_value_;
+  DISALLOW_COPY_AND_ASSIGN(EnumMapper);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_CROS_ENUM_MAPPER_H_