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      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 Value* value, T* out_value);
     30 
     31 template<>
     32 inline bool ParseValue<bool>(const Value* value, bool* out_value) {
     33   return value->GetAsBoolean(out_value);
     34 }
     35 
     36 template<>
     37 inline bool ParseValue<int>(const Value* value, int* out_value) {
     38   return value->GetAsInteger(out_value);
     39 }
     40 
     41 template<>
     42 inline bool ParseValue<double>(const Value* value, double* out_value) {
     43   return value->GetAsDouble(out_value);
     44 }
     45 
     46 template<>
     47 inline bool ParseValue<std::string>(const Value* value,
     48                                     std::string* out_value) {
     49   return value->GetAsString(out_value);
     50 }
     51 
     52 template<>
     53 inline bool ParseValue<base::string16>(const 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 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 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_
    171