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// Copyright (C) 2011 The Libphonenumber Authors
//
// 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: Philippe Liard
#ifndef I18N_PHONENUMBERS_DEFAULT_LOGGER_H_
#define I18N_PHONENUMBERS_DEFAULT_LOGGER_H_
#include "phonenumbers/logger.h"
#ifdef USE_GOOGLE_BASE
namespace i18n {
namespace phonenumbers {
// If Google base/ is used, LOG() and VLOG() from base/logging.h are used
// therefore the default logger implementation (StdoutLogger) instantiated in
// phonenumberutil will actually never be used.
typedef NullLogger StdoutLogger;
} // namespace phonenumbers
} // namespace i18n
#else
#include <sstream>
#include <string>
using std::string;
using std::stringstream;
// Make the logging functions private (not declared in logger.h) as the client
// should not have any reason to use them.
namespace {
using i18n::phonenumbers::Logger;
// Class template used to inline the right implementation for the T -> string
// conversion.
template <typename T>
struct ConvertToString;
template <typename T>
struct ConvertToString {
static inline string DoWork(const T& s) {
return string(s);
}
};
template <>
struct ConvertToString<int> {
static inline string DoWork(int n) {
stringstream stream;
stream << n;
string result;
stream >> result;
return result;
}
};
class LoggerHandler {
public:
LoggerHandler(Logger* impl) : impl_(impl) {}
~LoggerHandler() {
if (impl_) {
impl_->WriteMessage("\n");
}
}
template <typename T>
LoggerHandler& operator<<(const T& value) {
if (impl_) {
impl_->WriteMessage(ConvertToString<T>::DoWork(value));
}
return *this;
}
private:
Logger* const impl_;
};
} // namespace
namespace i18n {
namespace phonenumbers {
inline LoggerHandler VLOG(int n) {
Logger* const logger_impl = Logger::mutable_logger_impl();
if (logger_impl->level() < n) {
return LoggerHandler(NULL);
}
logger_impl->WriteLevel();
return LoggerHandler(logger_impl);
}
inline LoggerHandler LOG(int n) {
return VLOG(n);
}
// Default logger implementation used by PhoneNumberUtil class. It outputs the
// messages to the standard output.
class StdoutLogger : public Logger {
public:
virtual ~StdoutLogger() {}
virtual void WriteLevel();
virtual void WriteMessage(const string& msg);
};
} // namespace phonenumbers
} // namespace i18n
#endif // USE_GOOGLE_BASE
#endif // I18N_PHONENUMBERS_DEFAULT_LOGGER_H_
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