Peter Qiu | c0beca5 | 2015-09-03 11:25:46 -0700 | [diff] [blame] | 1 | // |
| 2 | // Copyright (C) 2012 The Android Open Source Project |
| 3 | // |
| 4 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | // you may not use this file except in compliance with the License. |
| 6 | // You may obtain a copy of the License at |
| 7 | // |
| 8 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | // |
| 10 | // Unless required by applicable law or agreed to in writing, software |
| 11 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | // See the License for the specific language governing permissions and |
| 14 | // limitations under the License. |
| 15 | // |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 16 | |
Ben Chan | c45688b | 2014-07-02 23:50:45 -0700 | [diff] [blame] | 17 | #ifndef SHILL_PROPERTY_ACCESSOR_H_ |
| 18 | #define SHILL_PROPERTY_ACCESSOR_H_ |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 19 | |
Ben Chan | cc67c52 | 2014-09-03 07:19:18 -0700 | [diff] [blame] | 20 | #include <base/macros.h> |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 21 | #include <gtest/gtest_prod.h> // for FRIEND_TEST. |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 22 | |
| 23 | #include "shill/accessor_interface.h" |
mukesh agrawal | ffa3d04 | 2011-10-06 15:26:10 -0700 | [diff] [blame] | 24 | #include "shill/error.h" |
Christopher Wiley | d778352 | 2012-08-10 14:21:47 -0700 | [diff] [blame] | 25 | #include "shill/logging.h" |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 26 | |
| 27 | namespace shill { |
| 28 | |
| 29 | // Templated implementations of AccessorInterface<>. |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 30 | // |
| 31 | // PropertyAccessor<>, ConstPropertyAccessor<>, and |
| 32 | // WriteOnlyPropertyAccessor<> provide R/W, R/O, and W/O access |
| 33 | // (respectively) to the value pointed to by |property|. |
| 34 | // |
| 35 | // This allows a class to easily map strings to member variables, so that |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 36 | // pieces of state stored in the class can be queried or updated by name. |
| 37 | // |
| 38 | // bool foo = true; |
| 39 | // map<string, BoolAccessor> accessors; |
| 40 | // accessors["foo"] = BoolAccessor(new PropertyAccessor<bool>(&foo)); |
| 41 | // bool new_foo = accessors["foo"]->Get(); // new_foo == true |
| 42 | // accessors["foo"]->Set(false); // returns true, because setting is allowed. |
| 43 | // // foo == false, new_foo == true |
| 44 | // new_foo = accessors["foo"]->Get(); // new_foo == false |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 45 | // // Clear resets |foo| to its value when the PropertyAccessor was created. |
| 46 | // accessors["foo"]->Clear(); // foo == true |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 47 | // |
| 48 | // Generic accessors that provide write capability will check that the |
| 49 | // new value differs from the present one. If the old and new values |
| 50 | // are the same, the setter will not invoke the assignment operator, and |
| 51 | // will return false. |
| 52 | // |
| 53 | // Custom accessors are responsible for handling set-to-same-value |
| 54 | // themselves. It is not possible to handle that here, because some |
| 55 | // custom getters return default values, rather than the actual |
| 56 | // value. (I'm looking at you, WiFi::GetBgscanMethod.) |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 57 | template <class T> |
| 58 | class PropertyAccessor : public AccessorInterface<T> { |
| 59 | public: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 60 | explicit PropertyAccessor(T* property) |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 61 | : property_(property), default_value_(*property) { |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 62 | DCHECK(property); |
| 63 | } |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 64 | ~PropertyAccessor() override {} |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 65 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 66 | void Clear(Error* error) override { Set(default_value_, error); } |
| 67 | T Get(Error* /*error*/) override { return *property_; } |
| 68 | bool Set(const T& value, Error* /*error*/) override { |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 69 | if (*property_ == value) { |
| 70 | return false; |
| 71 | } |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 72 | *property_ = value; |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 73 | return true; |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | private: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 77 | T* const property_; |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 78 | const T default_value_; |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 79 | DISALLOW_COPY_AND_ASSIGN(PropertyAccessor); |
| 80 | }; |
| 81 | |
| 82 | template <class T> |
| 83 | class ConstPropertyAccessor : public AccessorInterface<T> { |
| 84 | public: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 85 | explicit ConstPropertyAccessor(const T* property) : property_(property) { |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 86 | DCHECK(property); |
| 87 | } |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 88 | ~ConstPropertyAccessor() override {} |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 89 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 90 | void Clear(Error* error) override { |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 91 | // TODO(quiche): check if this is the right error. |
| 92 | // (maybe Error::kInvalidProperty instead?) |
| 93 | error->Populate(Error::kInvalidArguments, "Property is read-only"); |
| 94 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 95 | T Get(Error* /*error*/) override { return *property_; } |
| 96 | bool Set(const T& /*value*/, Error* error) override { |
mukesh agrawal | ffa3d04 | 2011-10-06 15:26:10 -0700 | [diff] [blame] | 97 | // TODO(quiche): check if this is the right error. |
| 98 | // (maybe Error::kPermissionDenied instead?) |
| 99 | error->Populate(Error::kInvalidArguments, "Property is read-only"); |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 100 | return false; |
mukesh agrawal | ffa3d04 | 2011-10-06 15:26:10 -0700 | [diff] [blame] | 101 | } |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 102 | |
| 103 | private: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 104 | const T* const property_; |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 105 | DISALLOW_COPY_AND_ASSIGN(ConstPropertyAccessor); |
| 106 | }; |
| 107 | |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 108 | template <class T> |
| 109 | class WriteOnlyPropertyAccessor : public AccessorInterface<T> { |
| 110 | public: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 111 | explicit WriteOnlyPropertyAccessor(T* property) |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 112 | : property_(property), default_value_(*property) { |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 113 | DCHECK(property); |
| 114 | } |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 115 | ~WriteOnlyPropertyAccessor() override {} |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 116 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 117 | void Clear(Error* error) override { Set(default_value_, error); } |
| 118 | T Get(Error* error) override { |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 119 | error->Populate(Error::kPermissionDenied, "Property is write-only"); |
| 120 | return T(); |
| 121 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 122 | bool Set(const T& value, Error* /*error*/) override { |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 123 | if (*property_ == value) { |
| 124 | return false; |
| 125 | } |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 126 | *property_ = value; |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 127 | return true; |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | private: |
| 131 | FRIEND_TEST(PropertyAccessorTest, SignedIntCorrectness); |
| 132 | FRIEND_TEST(PropertyAccessorTest, UnsignedIntCorrectness); |
| 133 | FRIEND_TEST(PropertyAccessorTest, StringCorrectness); |
Victor Dodon | 1ee315f | 2016-01-05 15:26:22 -0800 | [diff] [blame] | 134 | FRIEND_TEST(PropertyAccessorTest, ByteArrayCorrectness); |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 135 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 136 | T* const property_; |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 137 | const T default_value_; |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 138 | DISALLOW_COPY_AND_ASSIGN(WriteOnlyPropertyAccessor); |
| 139 | }; |
| 140 | |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 141 | // CustomAccessor<> allows custom getter and setter methods to be provided. |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 142 | // Thus, if the state to be returned is to be derived on-demand, or if |
| 143 | // setting the property requires validation, we can still fit it into the |
| 144 | // AccessorInterface<> framework. |
| 145 | // |
| 146 | // If the property is write-only, use CustomWriteOnlyAccessor instead. |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 147 | template<class C, class T> |
| 148 | class CustomAccessor : public AccessorInterface<T> { |
| 149 | public: |
Paul Stewart | 985d7d5 | 2013-10-16 13:46:09 -0700 | [diff] [blame] | 150 | // |target| is the object on which to call the methods |getter|, |setter| |
| 151 | // and |clearer|. |setter| is allowed to be NULL, in which case we will |
| 152 | // simply reject attempts to set via the accessor. |setter| should return |
| 153 | // true if the value was changed, and false otherwise. |clearer| is allowed |
| 154 | // to be NULL (which is what happens if it is not passed to the constructor), |
| 155 | // in which case, |setter| is called is called with the default value. |
| 156 | // It is an error to pass NULL for either |target| or |getter|. |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 157 | CustomAccessor(C* target, |
| 158 | T(C::*getter)(Error* error), |
| 159 | bool(C::*setter)(const T& value, Error* error), |
| 160 | void(C::*clearer)(Error* error)) |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 161 | : target_(target), |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 162 | default_value_(), |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 163 | getter_(getter), |
Paul Stewart | 985d7d5 | 2013-10-16 13:46:09 -0700 | [diff] [blame] | 164 | setter_(setter), |
| 165 | clearer_(clearer) { |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 166 | DCHECK(target); |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 167 | DCHECK(getter); // otherwise, use CustomWriteOnlyAccessor |
| 168 | if (setter_) { |
| 169 | Error e; |
| 170 | default_value_ = Get(&e); |
| 171 | } |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 172 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 173 | CustomAccessor(C* target, |
| 174 | T(C::*getter)(Error* error), |
| 175 | bool(C::*setter)(const T& value, Error* error)) |
Ben Chan | cc225ef | 2014-09-30 13:26:51 -0700 | [diff] [blame] | 176 | : CustomAccessor(target, getter, setter, nullptr) {} |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 177 | ~CustomAccessor() override {} |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 178 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 179 | void Clear(Error* error) override { |
Paul Stewart | 985d7d5 | 2013-10-16 13:46:09 -0700 | [diff] [blame] | 180 | if (clearer_) { |
| 181 | (target_->*clearer_)(error); |
| 182 | } else { |
| 183 | Set(default_value_, error); |
| 184 | } |
| 185 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 186 | T Get(Error* error) override { |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 187 | return (target_->*getter_)(error); |
Gaurav Shah | 1b7a616 | 2011-11-09 11:41:01 -0800 | [diff] [blame] | 188 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 189 | bool Set(const T& value, Error* error) override { |
mukesh agrawal | ffa3d04 | 2011-10-06 15:26:10 -0700 | [diff] [blame] | 190 | if (setter_) { |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 191 | return (target_->*setter_)(value, error); |
mukesh agrawal | ffa3d04 | 2011-10-06 15:26:10 -0700 | [diff] [blame] | 192 | } else { |
| 193 | error->Populate(Error::kInvalidArguments, "Property is read-only"); |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 194 | return false; |
mukesh agrawal | ffa3d04 | 2011-10-06 15:26:10 -0700 | [diff] [blame] | 195 | } |
| 196 | } |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 197 | |
| 198 | private: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 199 | C* const target_; |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 200 | // |default_value_| is non-const because it can't be initialized in |
| 201 | // the initializer list. |
| 202 | T default_value_; |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 203 | T(C::*const getter_)(Error* error); |
| 204 | bool(C::*const setter_)(const T& value, Error* error); // NOLINT - "casting" |
| 205 | void(C::*const clearer_)(Error* error); |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 206 | DISALLOW_COPY_AND_ASSIGN(CustomAccessor); |
| 207 | }; |
| 208 | |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 209 | // CustomWriteOnlyAccessor<> allows a custom writer method to be provided. |
| 210 | // Get returns an error automatically. Clear resets the value to a |
| 211 | // default value. |
| 212 | template<class C, class T> |
| 213 | class CustomWriteOnlyAccessor : public AccessorInterface<T> { |
| 214 | public: |
| 215 | // |target| is the object on which to call |setter| and |clearer|. |
| 216 | // |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 217 | // |target| and |setter| must be non-NULL. |setter| should return true |
| 218 | // if the value was changed, and false otherwise. |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 219 | // |
| 220 | // Either |clearer| or |default_value|, but not both, must be non-NULL. |
| 221 | // Whichever is non-NULL is used to clear the property. |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 222 | CustomWriteOnlyAccessor(C* target, |
| 223 | bool(C::*setter)(const T& value, Error* error), |
| 224 | void(C::*clearer)(Error* error), |
| 225 | const T* default_value) |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 226 | : target_(target), |
| 227 | setter_(setter), |
| 228 | clearer_(clearer), |
| 229 | default_value_() { |
| 230 | DCHECK(target); |
| 231 | DCHECK(setter); |
| 232 | DCHECK(clearer || default_value); |
| 233 | DCHECK(!clearer || !default_value); |
| 234 | if (default_value) { |
| 235 | default_value_ = *default_value; |
| 236 | } |
| 237 | } |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 238 | ~CustomWriteOnlyAccessor() override {} |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 239 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 240 | void Clear(Error* error) override { |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 241 | if (clearer_) { |
| 242 | (target_->*clearer_)(error); |
| 243 | } else { |
| 244 | Set(default_value_, error); |
| 245 | } |
| 246 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 247 | T Get(Error* error) override { |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 248 | error->Populate(Error::kPermissionDenied, "Property is write-only"); |
| 249 | return T(); |
| 250 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 251 | bool Set(const T& value, Error* error) override { |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 252 | return (target_->*setter_)(value, error); |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | private: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 256 | C* const target_; |
| 257 | bool(C::*const setter_)(const T& value, Error* error); // NOLINT - "casting" |
| 258 | void(C::*const clearer_)(Error* error); |
mukesh agrawal | 292dc0f | 2012-01-26 18:02:46 -0800 | [diff] [blame] | 259 | // |default_value_| is non-const because it can't be initialized in |
| 260 | // the initializer list. |
| 261 | T default_value_; |
| 262 | DISALLOW_COPY_AND_ASSIGN(CustomWriteOnlyAccessor); |
| 263 | }; |
| 264 | |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 265 | // CustomReadOnlyAccessor<> allows a custom getter method to be provided. |
| 266 | // Set and Clear return errors automatically. |
| 267 | template<class C, class T> |
| 268 | class CustomReadOnlyAccessor : public AccessorInterface<T> { |
| 269 | public: |
| 270 | // |target| is the object on which to call the |getter| method. |
| 271 | // |getter| is a const method. If a non-const method needs to be used, |
| 272 | // use the CustomAccessor with a NULL setter instead. |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 273 | CustomReadOnlyAccessor(C* target, T(C::*getter)(Error* error) const) |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 274 | : target_(target), getter_(getter) { |
| 275 | DCHECK(target); |
| 276 | DCHECK(getter); |
| 277 | } |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 278 | ~CustomReadOnlyAccessor() override {} |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 279 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 280 | void Clear(Error* error) override { |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 281 | error->Populate(Error::kInvalidArguments, "Property is read-only"); |
| 282 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 283 | T Get(Error* error) override { |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 284 | return (target_->*getter_)(error); |
| 285 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 286 | bool Set(const T& value, Error* error) override { |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 287 | error->Populate(Error::kInvalidArguments, "Property is read-only"); |
| 288 | return false; |
| 289 | } |
| 290 | |
| 291 | private: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 292 | C* const target_; |
| 293 | T(C::*const getter_)(Error* error) const; |
Paul Stewart | 1cf7eb8 | 2013-12-03 19:34:36 -0800 | [diff] [blame] | 294 | DISALLOW_COPY_AND_ASSIGN(CustomReadOnlyAccessor); |
| 295 | }; |
| 296 | |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 297 | // CustomMappedAccessor<> passes an argument to the getter and setter |
| 298 | // so that a generic method can be used, for example one that accesses the |
| 299 | // property in a map. |
| 300 | template<class C, class T, class A> |
| 301 | class CustomMappedAccessor : public AccessorInterface<T> { |
| 302 | public: |
| 303 | // |target| is the object on which to call the methods |getter| and |setter|. |
| 304 | // |setter| is allowed to be NULL, in which case we will simply reject |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 305 | // attempts to set via the accessor. |setter| should return true if the |
| 306 | // value was changed, and false otherwise. |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 307 | // |argument| is passed to the getter and setter methods to disambiguate |
| 308 | // between different properties in |target|. |
| 309 | // It is an error to pass NULL for any of |target|, |clearer| or |getter|. |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 310 | CustomMappedAccessor(C* target, |
| 311 | void(C::*clearer)(const A& argument, Error* error), |
| 312 | T(C::*getter)(const A& argument, Error* error), |
| 313 | bool(C::*setter)(const A& argument, const T& value, |
| 314 | Error* error), |
| 315 | const A& argument) |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 316 | : target_(target), |
| 317 | clearer_(clearer), |
| 318 | getter_(getter), |
| 319 | setter_(setter), |
| 320 | argument_(argument) { |
| 321 | DCHECK(clearer); |
| 322 | DCHECK(target); |
| 323 | DCHECK(getter); |
| 324 | } |
Ben Chan | 5ea763b | 2014-08-13 11:07:54 -0700 | [diff] [blame] | 325 | ~CustomMappedAccessor() override {} |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 326 | |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 327 | void Clear(Error* error) override { |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 328 | (target_->*clearer_)(argument_, error); |
| 329 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 330 | T Get(Error* error) override { |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 331 | return (target_->*getter_)(argument_, error); |
| 332 | } |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 333 | bool Set(const T& value, Error* error) override { |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 334 | if (setter_) { |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 335 | return (target_->*setter_)(argument_, value, error); |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 336 | } else { |
| 337 | error->Populate(Error::kInvalidArguments, "Property is read-only"); |
mukesh agrawal | bebf1b8 | 2013-04-23 15:06:33 -0700 | [diff] [blame] | 338 | return false; |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 339 | } |
| 340 | } |
| 341 | |
| 342 | private: |
Paul Stewart | 1a212a6 | 2015-06-16 13:13:10 -0700 | [diff] [blame] | 343 | C* const target_; |
| 344 | void(C::*const clearer_)(const A& argument, Error* error); |
| 345 | T(C::*const getter_)(const A& argument, Error* error); |
| 346 | bool(C::*const setter_)(const A& argument, // NOLINT - "casting" |
| 347 | const T& value, Error* error); |
Paul Stewart | a61593e | 2012-03-23 13:06:21 -0700 | [diff] [blame] | 348 | A argument_; |
| 349 | DISALLOW_COPY_AND_ASSIGN(CustomMappedAccessor); |
| 350 | }; |
| 351 | |
Chris Masone | 3bd3c8c | 2011-06-13 08:20:26 -0700 | [diff] [blame] | 352 | } // namespace shill |
| 353 | |
Ben Chan | c45688b | 2014-07-02 23:50:45 -0700 | [diff] [blame] | 354 | #endif // SHILL_PROPERTY_ACCESSOR_H_ |