chrome/browser/ui/webui/chromeos/login/base_screen_handler_utils.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_UTILS_H_
   6 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_UTILS_H_
   7
   8 #include <cstddef>
   9 #include <string>
  10
  11 #include "base/callback.h"
  12 #include "base/logging.h"
  13 #include "base/strings/string16.h"
  14 #include "base/values.h"
  15
  16 namespace chromeos {
  17
  18 template<typename T>
  19 struct UnwrapConstRef {
  20   typedef T Type;
  21 };
  22
  23 template<typename T>
  24 struct UnwrapConstRef<const T&> {
  25   typedef T Type;
  26 };
  27
  28 template<typename T>
  29 inline bool ParseValue(const base::Value* value, T* out_value);
  30
  31 template<>
  32 inline bool ParseValue<bool>(const base::Value* value, bool* out_value) {
  33   return value->GetAsBoolean(out_value);
  34 }
  35
  36 template<>
  37 inline bool ParseValue<int>(const base::Value* value, int* out_value) {
  38   return value->GetAsInteger(out_value);
  39 }
  40
  41 template<>
  42 inline bool ParseValue<double>(const base::Value* value, double* out_value) {
  43   return value->GetAsDouble(out_value);
  44 }
  45
  46 template<>
  47 inline bool ParseValue<std::string>(const base::Value* value,
  48                                     std::string* out_value) {
  49   return value->GetAsString(out_value);
  50 }
  51
  52 template<>
  53 inline bool ParseValue<base::string16>(const base::Value* value,
  54                                        base::string16* out_value) {
  55   return value->GetAsString(out_value);
  56 }
  57
  58 template<>
  59 inline bool ParseValue<const base::DictionaryValue*>(
  60     const base::Value* value,
  61     const base::DictionaryValue** out_value) {
  62   return value->GetAsDictionary(out_value);
  63 }
  64
  65 template<typename T>
  66 inline bool GetArg(const base::ListValue* args, size_t index, T* out_value) {
  67   const base::Value* value;
  68   if (!args->Get(index, &value))
  69     return false;
  70   return ParseValue(value, out_value);
  71 }
  72
  73 inline base::FundamentalValue MakeValue(bool v) {
  74   return base::FundamentalValue(v);
  75 }
  76
  77 inline base::FundamentalValue MakeValue(int v) {
  78   return base::FundamentalValue(v);
  79 }
  80
  81 inline base::FundamentalValue MakeValue(double v) {
  82   return base::FundamentalValue(v);
  83 }
  84
  85 inline base::StringValue MakeValue(const std::string& v) {
  86   return base::StringValue(v);
  87 }
  88
  89 inline base::StringValue MakeValue(const base::string16& v) {
  90   return base::StringValue(v);
  91 }
  92
  93 template<typename T>
  94 inline const T& MakeValue(const T& v) {
  95   return v;
  96 }
  97
  98 inline void CallbackWrapper0(base::Callback<void()> callback,
  99                              const base::ListValue* args) {
 100   DCHECK(args);
 101   DCHECK(args->empty());
 102   callback.Run();
 103 }
 104
 105 template<typename A1>
 106 void CallbackWrapper1(base::Callback<void(A1)> callback,
 107                       const base::ListValue* args) {
 108   DCHECK(args);
 109   DCHECK_EQ(1u, args->GetSize());
 110   typename UnwrapConstRef<A1>::Type arg1;
 111   if (!GetArg(args, 0, &arg1)) {
 112     NOTREACHED();
 113     return;
 114   }
 115   callback.Run(arg1);
 116 }
 117
 118 template<typename A1, typename A2>
 119 void CallbackWrapper2(base::Callback<void(A1, A2)> callback,
 120                       const base::ListValue* args) {
 121   DCHECK(args);
 122   DCHECK_EQ(2u, args->GetSize());
 123   typename UnwrapConstRef<A1>::Type arg1;
 124   typename UnwrapConstRef<A2>::Type arg2;
 125   if (!GetArg(args, 0, &arg1) || !GetArg(args, 1, &arg2)) {
 126     NOTREACHED();
 127     return;
 128   }
 129   callback.Run(arg1, arg2);
 130 }
 131
 132 template<typename A1, typename A2, typename A3>
 133 void CallbackWrapper3(base::Callback<void(A1, A2, A3)> callback,
 134                       const base::ListValue* args) {
 135   DCHECK(args);
 136   DCHECK_EQ(3u, args->GetSize());
 137   typename UnwrapConstRef<A1>::Type arg1;
 138   typename UnwrapConstRef<A2>::Type arg2;
 139   typename UnwrapConstRef<A3>::Type arg3;
 140   if (!GetArg(args, 0, &arg1) ||
 141       !GetArg(args, 1, &arg2) ||
 142       !GetArg(args, 2, &arg3)) {
 143     NOTREACHED();
 144     return;
 145   }
 146   callback.Run(arg1, arg2, arg3);
 147 }
 148
 149 template<typename A1, typename A2, typename A3, typename A4>
 150 void CallbackWrapper4(base::Callback<void(A1, A2, A3, A4)> callback,
 151                       const base::ListValue* args) {
 152   DCHECK(args);
 153   DCHECK_EQ(4u, args->GetSize());
 154   typename UnwrapConstRef<A1>::Type arg1;
 155   typename UnwrapConstRef<A2>::Type arg2;
 156   typename UnwrapConstRef<A3>::Type arg3;
 157   typename UnwrapConstRef<A4>::Type arg4;
 158   if (!GetArg(args, 0, &arg1) ||
 159       !GetArg(args, 1, &arg2) ||
 160       !GetArg(args, 2, &arg3) ||
 161       !GetArg(args, 3, &arg4)) {
 162     NOTREACHED();
 163     return;
 164   }
 165   callback.Run(arg1, arg2, arg3, arg4);
 166 }
 167
 168 }  // namespace chromeos
 169
 170 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_UTILS_H_