1 // Copyright (C) 2011 The Libphonenumber Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 // Author: Fredrik Roubert 16 17 // RegExpCache is a simple wrapper around hash_map<> to store RegExp objects. 18 // 19 // To get a cached RegExp object for a regexp pattern string, call the 20 // GetRegExp() method of the class RegExpCache providing the pattern string. If 21 // a RegExp object corresponding to the pattern string doesn't already exist, it 22 // will be created by the GetRegExp() method. 23 // 24 // RegExpCache cache; 25 // const RegExp& regexp = cache.GetRegExp("\d"); 26 27 #ifndef I18N_PHONENUMBERS_REGEXP_CACHE_H_ 28 #define I18N_PHONENUMBERS_REGEXP_CACHE_H_ 29 30 #include <cstddef> 31 #include <string> 32 33 #include "phonenumbers/base/basictypes.h" 34 #include "phonenumbers/base/memory/scoped_ptr.h" 35 #include "phonenumbers/base/synchronization/lock.h" 36 37 #ifdef I18N_PHONENUMBERS_USE_TR1_UNORDERED_MAP 38 # include <tr1/unordered_map> 39 #else 40 # include <map> 41 #endif 42 43 namespace i18n { 44 namespace phonenumbers { 45 46 using std::string; 47 48 class AbstractRegExpFactory; 49 class RegExp; 50 51 class RegExpCache { 52 private: 53 #ifdef I18N_PHONENUMBERS_USE_TR1_UNORDERED_MAP 54 typedef std::tr1::unordered_map<string, const RegExp*> CacheImpl; 55 #else 56 typedef std::map<string, const RegExp*> CacheImpl; 57 #endif 58 59 public: 60 explicit RegExpCache(const AbstractRegExpFactory& regexp_factory, 61 size_t min_items); 62 ~RegExpCache(); 63 64 const RegExp& GetRegExp(const string& pattern); 65 66 private: 67 const AbstractRegExpFactory& regexp_factory_; 68 Lock lock_; // protects cache_impl_ 69 scoped_ptr<CacheImpl> cache_impl_; // protected by lock_ 70 friend class RegExpCacheTest_CacheConstructor_Test; 71 DISALLOW_COPY_AND_ASSIGN(RegExpCache); 72 }; 73 74 } // namespace phonenumbers 75 } // namespace i18n 76 77 #endif // I18N_PHONENUMBERS_REGEXP_CACHE_H_ 78
