cacheddateformat.h

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/*
 * 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.
 */

#ifndef _LOG4CXX_HELPERS_CACHED_DATE_FORMAT_H
#define _LOG4CXX_HELPERS_CACHED_DATE_FORMAT_H

#include <log4cxx/helpers/dateformat.h>

#if defined(_MSC_VER)
    #pragma warning ( push )
    #pragma warning ( disable: 4251 )
#endif

namespace log4cxx
{
namespace pattern
{
class LOG4CXX_EXPORT CachedDateFormat : public log4cxx::helpers::DateFormat
{
    public:
        enum
        {
            /*
             *  Constant used to represent that there was no change
             *  observed when changing the millisecond count.
             */
            NO_MILLISECONDS = -2,
            /*
             *  Constant used to represent that there was an
             *  observed change, but was an expected change.
             */
            UNRECOGNIZED_MILLISECONDS = -1
        };

    private:
        static const logchar digits[];


        static const int magic1;


        static const logchar magicString1[];


        static const int magic2;


        static const logchar magicString2[];


        static const logchar zeroString[];

        log4cxx::helpers::DateFormatPtr formatter;

        mutable int millisecondStart;

        mutable log4cxx_time_t slotBegin;


        mutable LogString cache;


        const int expiration;

        mutable log4cxx_time_t previousTime;

    public:
        CachedDateFormat(const log4cxx::helpers::DateFormatPtr& dateFormat, int expiration);

        static int findMillisecondStart(
            log4cxx_time_t time, const LogString& formatted,
            const log4cxx::helpers::DateFormatPtr& formatter,
            log4cxx::helpers::Pool& pool);

        virtual void format(LogString& sbuf,
            log4cxx_time_t date,
            log4cxx::helpers::Pool& p) const;

    private:
        static void millisecondFormat(int millis,
            LogString& buf,
            int offset);


    public:
        virtual void setTimeZone(const log4cxx::helpers::TimeZonePtr& zone);

        virtual void numberFormat(LogString& s,
            int n,
            log4cxx::helpers::Pool& p) const;

        static int getMaximumCacheValidity(const LogString& pattern);

    private:
        CachedDateFormat(const CachedDateFormat&);
        CachedDateFormat& operator=(const CachedDateFormat&);

        static bool regionMatches(
            const LogString& target,
            size_t toffset,
            const LogString& other,
            size_t ooffset,
            size_t len);

};



}  // namespace helpers
} // namespace log4cxx

#if defined(_MSC_VER)
    #pragma warning (pop)
#endif

#endif // _LOG4CXX_HELPERS_SIMPLE_DATE_FORMAT_H