src/main/cpp/ndcpatternconverter.cpp

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

#include <log4cxx/logstring.h>
#include <log4cxx/pattern/ndcpatternconverter.h>
#include <log4cxx/spi/loggingevent.h>
#include <log4cxx/spi/location/locationinfo.h>

using namespace LOG4CXX_NS;
using namespace LOG4CXX_NS::pattern;
using namespace LOG4CXX_NS::spi;
using namespace LOG4CXX_NS::helpers;

IMPLEMENT_LOG4CXX_OBJECT(NDCPatternConverter)

NDCPatternConverter::NDCPatternConverter() :
	LoggingEventPatternConverter(LOG4CXX_STR("NDC"),
		LOG4CXX_STR("ndc"))
{
}

PatternConverterPtr NDCPatternConverter::newInstance(
	const std::vector<LogString>& /* options */)
{
	return std::make_shared<NDCPatternConverter>();
}

void NDCPatternConverter::format( const spi::LoggingEventPtr& event, LogString& toAppendTo ) const
{
	LogString value;
	if (event->getNDC(value))
	{
		auto& info = getFormattingInfo();
		if (info.getMaxLength() < value.length())
			toAppendTo.append(value.substr(value.length() - info.getMaxLength()));
		else
			toAppendTo.append(value);
	}
	else
	{
		toAppendTo.append(LOG4CXX_STR("null"));
	}
}