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This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software License
 * version 1.1, a copy of which has been included  with this distribution in
 * the LICENSE.txt file.
 */

package org.apache.log4j.helpers;

import org.apache.log4j.spi.LoggingEvent;

/**

   

PatternConverter is an abtract class that provides the formatting functionality that derived classes need.

Conversion specifiers in a conversion patterns are parsed to individual PatternConverters. Each of which is responsible for converting a logging event in a converter specific manner. @author James P. Cakalic @author Ceki Gülcü @since 0.8.2 */ public abstract class PatternConverter { public PatternConverter next; int min = -1; int max = 0x7FFFFFFF; boolean leftAlign = false; protected PatternConverter() { } protected PatternConverter(FormattingInfo fi) { min = fi.min; max = fi.max; leftAlign = fi.leftAlign; } /** Derived pattern converters must override this method in order to convert conversion specifiers in the correct way. */ abstract protected String convert(LoggingEvent event); /** A template method for formatting in a converter specific way. */ public void format(StringBuffer sbuf, LoggingEvent e) { String s = convert(e); if(s == null) { if(0 < min) spacePad(sbuf, min); return; } int len = s.length(); if(len > max) sbuf.append(s.substring(len-max)); else if(len < min) { if(leftAlign) { sbuf.append(s); spacePad(sbuf, min-len); } else { spacePad(sbuf, min-len); sbuf.append(s); } } else sbuf.append(s); } static String[] SPACES = {" ", " ", " ", " ", //1,2,4,8 spaces " ", // 16 spaces " " }; // 32 spaces /** Fast space padding method. */ public void spacePad(StringBuffer sbuf, int length) { while(length >= 32) { sbuf.append(SPACES[5]); length -= 32; } for(int i = 4; i >= 0; i--) { if((length & (1<

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