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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
  *
  * When distributing the software, include this License Header Notice in each
  * file and include the License file at packager/legal/LICENSE.txt.
  *
  * GPL Classpath Exception:
  * Oracle designates this particular file as subject to the "Classpath"
  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
  *
  * Modifications:
  * If applicable, add the following below the License Header, with the fields
  * enclosed by brackets [] replaced by your own identifying information:
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  *
  * Contributor(s):
  * If you wish your version of this file to be governed by only the CDDL or
  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
  */
 
 package com.sun.enterprise.web.accesslog;
 
 
 import java.util.Date;
Abstract class defining an interface for appending access log entries to the access log in a customized access log format.
 
 public abstract class AccessLogFormatter {

    
The set of month abbreviations for log messages.
 
     static final String months[] =
     { "Jan""Feb""Mar""Apr""May""Jun",
       "Jul""Aug""Sep""Oct""Nov""Dec" };

    
When formatting log lines, we often use strings like this one (" ").
 
     protected static final String SPACE = " ";

    
ThreadLocal for a date formatter to format Dates into a day string in the format "dd".
 
     protected volatile ThreadLocal<SimpleDateFormatdayFormatter = null;

    
ThreadLocal for a date formatter to format a Date into a month string in the format "MM".
 
     protected volatile ThreadLocal<SimpleDateFormatmonthFormatter = null;

    
ThreadLocal for a date formatter to format a Date into a year string in the format "yyyy".
 
     protected volatile ThreadLocal<SimpleDateFormatyearFormatter = null;

    
ThreadLocal for a date formatter to format a Date into a time in the format "kk:mm:ss" (kk is a 24-hour representation of the hour).
 
     protected volatile ThreadLocal<SimpleDateFormattimeFormatter = null;

    
The time zone relative to GMT.
 
     protected String timeZone = null;
 
     protected TimeZone tz = null;
 
    /*
     * Flag indicating whether we need to measure the time (in milliseconds)
     * that was spent on each request
     */
    protected boolean needTimeTaken;

    
The system time when we last updated the Date that this valve uses for log lines.
    private Date currentDate = null;


    
Constructor. Initialize the timeZone and currentDate.
    public AccessLogFormatter() {
         = TimeZone.getDefault();
         = new Date(System.currentTimeMillis());
    }


    
Appends an access log entry line, with info obtained from the given request and response objects, to the given CharBuffer.

Parameters:
request The request object from which to obtain access log info
response The response object from which to obtain access log info
charBuffer The CharBuffer to which to append access log info
    public abstract void appendLogEntry(Request request,
                                        Response response,
                                        CharBuffer charBuffer);


    
This method returns a Date object that is accurate to within one second. If a writerThread calls this method to get a Date and it's been less than 1 second since a new Date was created, this method simply gives out the same Date again so that the system doesn't spend time creating Date objects unnecessarily.
    protected synchronized Date getDate() {
        // Only create a new Date once per second, max.
        long systime = System.currentTimeMillis();
        if ((systime - .getTime()) > 1000) {
             = new Date(systime);
        }
        return ;
    }
    protected String calculateTimeZoneOffset(long offset) {
        StringBuilder sb = new StringBuilder();
        if ((offset<0))  {
            sb.append("-");
            offset = -offset;
        } else {
            sb.append("+");
        }
        long hourOffset = offset/(1000*60*60);
        long minuteOffset = (offset/(1000*60)) % 60;
        if (hourOffset<10)
            sb.append("0");
        sb.append(hourOffset);
        if (minuteOffset<10)
            sb.append("0");
        sb.append(minuteOffset);
        return sb.toString();
    }


    
Return the month abbreviation for the specified month, which must be a two-digit String.

Parameters:
month Month number ("01" .. "12").
    protected String lookup(String month) {
        int index;
        try {
            index = Integer.parseInt(month) - 1;
        } catch (Throwable t) {
            index = 0;  // Can not happen, in theory
        }
        return ([index]);
    }


    
Has the time-taken token been specified in the access log pattern?

Returns:
true if the time-taken token has been specified in the access log pattern, false otherwise.
    public boolean needTimeTaken() {
        return ;
    }    
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