// Copyright (C) 2011 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Author: Philippe Liard
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#ifndef I18N_PHONENUMBERS_DEFAULT_LOGGER_H_
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#define I18N_PHONENUMBERS_DEFAULT_LOGGER_H_
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#include <string>
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#include "phonenumbers/logger.h"
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using std::string;
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// Make the logging functions private (not declared in logger.h) as the client
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// should not have any reason to use them.
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namespace {
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using i18n::phonenumbers::Logger;
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// Class template used to inline the right implementation for the T -> string
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// conversion.
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template <typename T>
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struct ConvertToString;
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template <typename T>
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struct ConvertToString {
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static inline string DoWork(const T& s) {
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return string(s);
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}
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};
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template <>
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struct ConvertToString<int> {
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static inline string DoWork(const int& n) {
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char buffer[16];
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std::snprintf(buffer, sizeof(buffer), "%d", n);
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return string(buffer);
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}
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};
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class LoggerHandler {
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public:
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LoggerHandler(Logger* impl) : impl_(impl) {}
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~LoggerHandler() {
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if (impl_) {
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impl_->WriteMessage("\n");
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}
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}
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template <typename T>
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LoggerHandler& operator<<(const T& value) {
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if (impl_) {
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impl_->WriteMessage(ConvertToString<T>::DoWork(value));
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}
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return *this;
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}
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private:
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Logger* const impl_;
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};
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} // namespace
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namespace i18n {
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namespace phonenumbers {
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inline LoggerHandler VLOG(int n) {
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Logger* const logger_impl = Logger::mutable_logger_impl();
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if (logger_impl->level() < n) {
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return LoggerHandler(NULL);
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}
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logger_impl->WriteLevel();
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return LoggerHandler(logger_impl);
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}
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inline LoggerHandler LOG(int n) {
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return VLOG(n);
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}
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// Default logger implementation used by PhoneNumberUtil class. It outputs the
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// messages to the standard output.
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class StdoutLogger : public Logger {
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public:
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virtual ~StdoutLogger() {}
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virtual void WriteLevel();
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virtual void WriteMessage(const string& msg);
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};
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} // namespace phonenumbers
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} // namespace i18n
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#endif // I18N_PHONENUMBERS_DEFAULT_LOGGER_H_
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