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// Copyright (C) 2011 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: Fredrik Roubert <roubert@google.com>
// RE2Cache is a simple wrapper around hash_map<> to store RE2 objects.
//
// To get a cached RE2 object for a regexp pattern string, create a ScopedAccess
// object with a pointer to the cache object and the pattern string itself as
// constructor parameters. If an RE2 object corresponding to the pattern string
// doesn't already exist, it will be created by the access object constructor.
// The access object implements operator const RE& and can therefore be passed
// as an argument to any function that expects an RE2 object.
//
// RE2Cache cache;
// RE2Cache::ScopedAccess foo(&cache, "foo");
// bool match = RE2::FullMatch("foobar", foo);
#ifndef I18N_PHONENUMBERS_RE2_CACHE_H_
#define I18N_PHONENUMBERS_RE2_CACHE_H_
#ifdef __DEPRECATED
#undef __DEPRECATED // Don't warn for using <hash_map>.
#endif
#include <cstddef>
#include <hash_map>
#include <string>
#include "base/scoped_ptr.h"
#include "base/synchronization/lock.h"
namespace re2 {
class RE2;
} // namespace re2
namespace i18n {
namespace phonenumbers {
using re2::RE2;
using std::string;
using __gnu_cxx::hash_map;
class RE2Cache {
private:
typedef hash_map<string, const RE2*> CacheImpl;
public:
explicit RE2Cache(size_t min_items);
~RE2Cache();
class ScopedAccess {
public:
ScopedAccess(RE2Cache* cache, const string& pattern);
operator const RE2&() const { return *regexp_; }
private:
const RE2* regexp_;
friend class RE2CacheTest_AccessConstructor_Test;
};
private:
base::Lock lock_; // protects cache_impl_
scoped_ptr<CacheImpl> cache_impl_; // protected by lock_
friend class RE2CacheTest_CacheConstructor_Test;
friend class RE2CacheTest_AccessConstructor_Test;
};
} // namespace phonenumbers
} // namespace i18n
#endif // I18N_PHONENUMBERS_RE2_CACHE_H_
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