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Side by Side Diff: base/values.h

Issue 6081007: Start sorting methods in class declarations. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: nits Created 9 years, 11 months ago
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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // This file specifies a recursive data storage class called Value intended for 5 // This file specifies a recursive data storage class called Value intended for
6 // storing setting and other persistable data. It includes the ability to 6 // storing setting and other persistable data. It includes the ability to
7 // specify (recursive) lists and dictionaries, so it's fairly expressive. 7 // specify (recursive) lists and dictionaries, so it's fairly expressive.
8 // However, the API is optimized for the common case, namely storing a 8 // However, the API is optimized for the common case, namely storing a
9 // hierarchical tree of simple values. Given a DictionaryValue root, you can 9 // hierarchical tree of simple values. Given a DictionaryValue root, you can
10 // easily do things like: 10 // easily do things like:
11 // 11 //
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39 class ListValue; 39 class ListValue;
40 40
41 typedef std::vector<Value*> ValueVector; 41 typedef std::vector<Value*> ValueVector;
42 typedef std::map<std::string, Value*> ValueMap; 42 typedef std::map<std::string, Value*> ValueMap;
43 43
44 // The Value class is the base class for Values. A Value can be 44 // The Value class is the base class for Values. A Value can be
45 // instantiated via the Create*Value() factory methods, or by directly 45 // instantiated via the Create*Value() factory methods, or by directly
46 // creating instances of the subclasses. 46 // creating instances of the subclasses.
47 class Value { 47 class Value {
48 public: 48 public:
49 enum ValueType {
50 TYPE_NULL = 0,
51 TYPE_BOOLEAN,
52 TYPE_INTEGER,
53 TYPE_REAL,
54 TYPE_STRING,
55 TYPE_BINARY,
56 TYPE_DICTIONARY,
57 TYPE_LIST
58 };
59
49 virtual ~Value(); 60 virtual ~Value();
50 61
51 // Convenience methods for creating Value objects for various 62 // Convenience methods for creating Value objects for various
52 // kinds of values without thinking about which class implements them. 63 // kinds of values without thinking about which class implements them.
53 // These can always be expected to return a valid Value*. 64 // These can always be expected to return a valid Value*.
54 static Value* CreateNullValue(); 65 static Value* CreateNullValue();
55 static Value* CreateBooleanValue(bool in_value); 66 static Value* CreateBooleanValue(bool in_value);
56 static Value* CreateIntegerValue(int in_value); 67 static Value* CreateIntegerValue(int in_value);
57 static Value* CreateRealValue(double in_value); 68 static Value* CreateRealValue(double in_value);
58 static Value* CreateStringValue(const std::string& in_value); 69 static Value* CreateStringValue(const std::string& in_value);
59 static Value* CreateStringValue(const string16& in_value); 70 static Value* CreateStringValue(const string16& in_value);
60 71
61 // This one can return NULL if the input isn't valid. If the return value 72 // This one can return NULL if the input isn't valid. If the return value
62 // is non-null, the new object has taken ownership of the buffer pointer. 73 // is non-null, the new object has taken ownership of the buffer pointer.
63 static BinaryValue* CreateBinaryValue(char* buffer, size_t size); 74 static BinaryValue* CreateBinaryValue(char* buffer, size_t size);
64 75
65 typedef enum {
66 TYPE_NULL = 0,
67 TYPE_BOOLEAN,
68 TYPE_INTEGER,
69 TYPE_REAL,
70 TYPE_STRING,
71 TYPE_BINARY,
72 TYPE_DICTIONARY,
73 TYPE_LIST
74 } ValueType;
75
76 // Returns the type of the value stored by the current Value object. 76 // Returns the type of the value stored by the current Value object.
77 // Each type will be implemented by only one subclass of Value, so it's 77 // Each type will be implemented by only one subclass of Value, so it's
78 // safe to use the ValueType to determine whether you can cast from 78 // safe to use the ValueType to determine whether you can cast from
79 // Value* to (Implementing Class)*. Also, a Value object never changes 79 // Value* to (Implementing Class)*. Also, a Value object never changes
80 // its type after construction. 80 // its type after construction.
81 ValueType GetType() const { return type_; } 81 ValueType GetType() const { return type_; }
82 82
83 // Returns true if the current object represents a given type. 83 // Returns true if the current object represents a given type.
84 bool IsType(ValueType type) const { return type == type_; } 84 bool IsType(ValueType type) const { return type == type_; }
85 85
(...skipping 74 matching lines...) Expand 10 before | Expand all | Expand 10 after
160 virtual bool Equals(const Value* other) const; 160 virtual bool Equals(const Value* other) const;
161 161
162 private: 162 private:
163 std::string value_; 163 std::string value_;
164 164
165 DISALLOW_COPY_AND_ASSIGN(StringValue); 165 DISALLOW_COPY_AND_ASSIGN(StringValue);
166 }; 166 };
167 167
168 class BinaryValue: public Value { 168 class BinaryValue: public Value {
169 public: 169 public:
170 virtual ~BinaryValue();
171
170 // Creates a Value to represent a binary buffer. The new object takes 172 // Creates a Value to represent a binary buffer. The new object takes
171 // ownership of the pointer passed in, if successful. 173 // ownership of the pointer passed in, if successful.
172 // Returns NULL if buffer is NULL. 174 // Returns NULL if buffer is NULL.
173 static BinaryValue* Create(char* buffer, size_t size); 175 static BinaryValue* Create(char* buffer, size_t size);
174 176
175 // For situations where you want to keep ownership of your buffer, this 177 // For situations where you want to keep ownership of your buffer, this
176 // factory method creates a new BinaryValue by copying the contents of the 178 // factory method creates a new BinaryValue by copying the contents of the
177 // buffer that's passed in. 179 // buffer that's passed in.
178 // Returns NULL if buffer is NULL. 180 // Returns NULL if buffer is NULL.
179 static BinaryValue* CreateWithCopiedBuffer(const char* buffer, size_t size); 181 static BinaryValue* CreateWithCopiedBuffer(const char* buffer, size_t size);
180 182
181 virtual ~BinaryValue();
182
183 // Subclassed methods
184 virtual Value* DeepCopy() const;
185 virtual bool Equals(const Value* other) const;
186
187 size_t GetSize() const { return size_; } 183 size_t GetSize() const { return size_; }
188 char* GetBuffer() { return buffer_; } 184 char* GetBuffer() { return buffer_; }
189 const char* GetBuffer() const { return buffer_; } 185 const char* GetBuffer() const { return buffer_; }
190 186
187 // Overridden from Value:
188 virtual Value* DeepCopy() const;
189 virtual bool Equals(const Value* other) const;
190
191 private: 191 private:
192 // Constructor is private so that only objects with valid buffer pointers 192 // Constructor is private so that only objects with valid buffer pointers
193 // and size values can be created. 193 // and size values can be created.
194 BinaryValue(char* buffer, size_t size); 194 BinaryValue(char* buffer, size_t size);
195 195
196 char* buffer_; 196 char* buffer_;
197 size_t size_; 197 size_t size_;
198 198
199 DISALLOW_COPY_AND_ASSIGN(BinaryValue); 199 DISALLOW_COPY_AND_ASSIGN(BinaryValue);
200 }; 200 };
201 201
202 // DictionaryValue provides a key-value dictionary with (optional) "path" 202 // DictionaryValue provides a key-value dictionary with (optional) "path"
203 // parsing for recursive access; see the comment at the top of the file. Keys 203 // parsing for recursive access; see the comment at the top of the file. Keys
204 // are |std::string|s and should be UTF-8 encoded. 204 // are |std::string|s and should be UTF-8 encoded.
205 class DictionaryValue : public Value { 205 class DictionaryValue : public Value {
206 public: 206 public:
207 DictionaryValue(); 207 DictionaryValue();
208 virtual ~DictionaryValue(); 208 virtual ~DictionaryValue();
209 209
210 // Subclassed methods
211 virtual Value* DeepCopy() const;
212 virtual bool Equals(const Value* other) const;
213
214 // Returns true if the current dictionary has a value for the given key. 210 // Returns true if the current dictionary has a value for the given key.
215 bool HasKey(const std::string& key) const; 211 bool HasKey(const std::string& key) const;
216 212
217 // Returns the number of Values in this dictionary. 213 // Returns the number of Values in this dictionary.
218 size_t size() const { return dictionary_.size(); } 214 size_t size() const { return dictionary_.size(); }
219 215
220 // Returns whether the dictionary is empty. 216 // Returns whether the dictionary is empty.
221 bool empty() const { return dictionary_.empty(); } 217 bool empty() const { return dictionary_.empty(); }
222 218
223 // Clears any current contents of this dictionary. 219 // Clears any current contents of this dictionary.
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326 bool operator!=(const key_iterator& other) { return itr_ != other.itr_; } 322 bool operator!=(const key_iterator& other) { return itr_ != other.itr_; }
327 bool operator==(const key_iterator& other) { return itr_ == other.itr_; } 323 bool operator==(const key_iterator& other) { return itr_ == other.itr_; }
328 324
329 private: 325 private:
330 ValueMap::const_iterator itr_; 326 ValueMap::const_iterator itr_;
331 }; 327 };
332 328
333 key_iterator begin_keys() const { return key_iterator(dictionary_.begin()); } 329 key_iterator begin_keys() const { return key_iterator(dictionary_.begin()); }
334 key_iterator end_keys() const { return key_iterator(dictionary_.end()); } 330 key_iterator end_keys() const { return key_iterator(dictionary_.end()); }
335 331
332 // Overridden from Value:
333 virtual Value* DeepCopy() const;
334 virtual bool Equals(const Value* other) const;
335
336 private: 336 private:
337 ValueMap dictionary_; 337 ValueMap dictionary_;
338 338
339 DISALLOW_COPY_AND_ASSIGN(DictionaryValue); 339 DISALLOW_COPY_AND_ASSIGN(DictionaryValue);
340 }; 340 };
341 341
342 // This type of Value represents a list of other Value values. 342 // This type of Value represents a list of other Value values.
343 class ListValue : public Value { 343 class ListValue : public Value {
344 public: 344 public:
345 typedef ValueVector::iterator iterator;
346 typedef ValueVector::const_iterator const_iterator;
347
345 ListValue(); 348 ListValue();
346 ~ListValue(); 349 ~ListValue();
347 350
348 // Subclassed methods
349 virtual bool GetAsList(ListValue** out_value);
350 virtual Value* DeepCopy() const;
351 virtual bool Equals(const Value* other) const;
352
353 // Clears the contents of this ListValue 351 // Clears the contents of this ListValue
354 void Clear(); 352 void Clear();
355 353
356 // Returns the number of Values in this list. 354 // Returns the number of Values in this list.
357 size_t GetSize() const { return list_.size(); } 355 size_t GetSize() const { return list_.size(); }
358 356
359 // Returns whether the list is empty. 357 // Returns whether the list is empty.
360 bool empty() const { return list_.empty(); } 358 bool empty() const { return list_.empty(); }
361 359
362 // Sets the list item at the given index to be the Value specified by 360 // Sets the list item at the given index to be the Value specified by
(...skipping 41 matching lines...) Expand 10 before | Expand all | Expand 10 after
404 // Insert a Value at index. 402 // Insert a Value at index.
405 // Returns true if successful, or false if the index was out of range. 403 // Returns true if successful, or false if the index was out of range.
406 bool Insert(size_t index, Value* in_value); 404 bool Insert(size_t index, Value* in_value);
407 405
408 // Swaps contents with the |other| list. 406 // Swaps contents with the |other| list.
409 void Swap(ListValue* other) { 407 void Swap(ListValue* other) {
410 list_.swap(other->list_); 408 list_.swap(other->list_);
411 } 409 }
412 410
413 // Iteration 411 // Iteration
414 typedef ValueVector::iterator iterator;
415 typedef ValueVector::const_iterator const_iterator;
416
417 ListValue::iterator begin() { return list_.begin(); } 412 ListValue::iterator begin() { return list_.begin(); }
418 ListValue::iterator end() { return list_.end(); } 413 ListValue::iterator end() { return list_.end(); }
419 414
420 ListValue::const_iterator begin() const { return list_.begin(); } 415 ListValue::const_iterator begin() const { return list_.begin(); }
421 ListValue::const_iterator end() const { return list_.end(); } 416 ListValue::const_iterator end() const { return list_.end(); }
422 417
418 // Overridden from Value:
419 virtual bool GetAsList(ListValue** out_value);
420 virtual Value* DeepCopy() const;
421 virtual bool Equals(const Value* other) const;
422
423 private: 423 private:
424 ValueVector list_; 424 ValueVector list_;
425 425
426 DISALLOW_COPY_AND_ASSIGN(ListValue); 426 DISALLOW_COPY_AND_ASSIGN(ListValue);
427 }; 427 };
428 428
429 // This interface is implemented by classes that know how to serialize and 429 // This interface is implemented by classes that know how to serialize and
430 // deserialize Value objects. 430 // deserialize Value objects.
431 class ValueSerializer { 431 class ValueSerializer {
432 public: 432 public:
433 virtual ~ValueSerializer(); 433 virtual ~ValueSerializer();
434 434
435 virtual bool Serialize(const Value& root) = 0; 435 virtual bool Serialize(const Value& root) = 0;
436 436
437 // This method deserializes the subclass-specific format into a Value object. 437 // This method deserializes the subclass-specific format into a Value object.
438 // If the return value is non-NULL, the caller takes ownership of returned 438 // If the return value is non-NULL, the caller takes ownership of returned
439 // Value. If the return value is NULL, and if error_code is non-NULL, 439 // Value. If the return value is NULL, and if error_code is non-NULL,
440 // error_code will be set with the underlying error. 440 // error_code will be set with the underlying error.
441 // If |error_message| is non-null, it will be filled in with a formatted 441 // If |error_message| is non-null, it will be filled in with a formatted
442 // error message including the location of the error if appropriate. 442 // error message including the location of the error if appropriate.
443 virtual Value* Deserialize(int* error_code, std::string* error_str) = 0; 443 virtual Value* Deserialize(int* error_code, std::string* error_str) = 0;
444 }; 444 };
445 445
446 #endif // BASE_VALUES_H_ 446 #endif // BASE_VALUES_H_
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