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/*
* Phusion Passenger - http://www.modrails.com/
* Copyright (c) 2011 Phusion
*
* "Phusion Passenger" is a trademark of Hongli Lai & Ninh Bui.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_STRING_MAP_H_
#define _PASSENGER_STRING_MAP_H_
#include <string>
#include <map>
#include <utility>
#include <StaticString.h>
namespace Passenger {
using namespace std;
/**
* An efficient map with string keys. map<string, T> forces one to construct an
* std::string object when looking up the map. StringMap interns all keys and
* allows lookups without constructing an std::string key.
*
* StringMap requires the following properties on T:
* - T's default constructor must be cheap, otherwise set() can be a bit slow.
* - T must support operator=().
*/
template<typename T>
class StringMap {
private:
struct Entry {
string key;
T value;
};
typedef map<StaticString, Entry> InternalMap;
typedef typename InternalMap::iterator Iterator;
typedef typename InternalMap::const_iterator ConstIterator;
typedef typename InternalMap::value_type ValueType;
InternalMap store;
public:
T get(const StaticString &key) const {
ConstIterator it = store.find(key);
if (it == store.end()) {
return T();
} else {
return it->second.value;
}
}
bool set(const StaticString &key, const T &value) {
pair<Iterator, bool> result = store.insert(make_pair(key, Entry()));
if (result.second) {
// Key has been inserted. Copy it internally and point key
// to the copy.
ValueType &node = *result.first;
StaticString &originalKey = const_cast<StaticString &>(node.first);
Entry &entry = node.second;
entry.key = key;
entry.value = value;
originalKey = entry.key;
return true;
} else {
// Key already exists. Update value.
Entry &entry = result.first->second;
entry.value = value;
return false;
}
}
bool remove(const StaticString &key) {
return store.erase(key) > 0;
}
};
} // namespace Passenger
#endif /* _PASSENGER_STRING_MAP_H_ */
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