/*
 * 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.
 */


#if !defined(_LOG4CXX_ROLLING_TRIGGER_POLICY_H)
#define _LOG4CXX_ROLLING_TRIGGER_POLICY_H


#include <log4cxx/spi/optionhandler.h>
#include <log4cxx/helpers/object.h>
#include <log4cxx/spi/loggingevent.h>
#include <log4cxx/appender.h>

namespace LOG4CXX_NS
{
class File;

namespace rolling
{

/**
 * A <code>TriggeringPolicy</code> controls the conditions under which rollover
 * occurs. Such conditions include time of day, file size, an
 * external event or a combination thereof.
 *
 *
 *
 * */

class LOG4CXX_EXPORT TriggeringPolicy :
	public virtual spi::OptionHandler,
	public virtual helpers::Object
{
		DECLARE_ABSTRACT_LOG4CXX_OBJECT(TriggeringPolicy)
		BEGIN_LOG4CXX_CAST_MAP()
		LOG4CXX_CAST_ENTRY(TriggeringPolicy)
		LOG4CXX_CAST_ENTRY(spi::OptionHandler)
		END_LOG4CXX_CAST_MAP()
	public:
		virtual ~TriggeringPolicy();

		/**
		 * Determines if a rollover may be appropriate at this time.  If
		 * true is returned, RolloverPolicy.rollover will be called but it
		 * can determine that a rollover is not warranted.
		 *
		 * @param appender A reference to the appender.
		 * @param event A reference to the currently event.
		 * @param filename The filename for the currently active log file.
		 * @param fileLength Length of the file in bytes.
		 * @return true if a rollover should occur.
		 */
		virtual bool isTriggeringEvent(
			Appender* appender,
			const spi::LoggingEventPtr& event,
			const LogString& filename,
			size_t fileLength) = 0;

};

LOG4CXX_PTR_DEF(TriggeringPolicy);


}
}

#endif
