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java/org/apache/catalina/util/Strftime.java
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253
java/org/apache/catalina/util/Strftime.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.util;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Locale;
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import java.util.Properties;
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import java.util.TimeZone;
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/**
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* Converts dates to strings using the same format specifiers as strftime
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*
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* Note: This does not mimic strftime perfectly. Certain strftime commands,
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* are not supported, and will convert as if they were literals.
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*
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* Certain complicated commands, like those dealing with the week of the year
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* probably don't have exactly the same behavior as strftime.
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*
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* These limitations are due to use SimpleDateTime. If the conversion was done
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* manually, all these limitations could be eliminated.
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*
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* The interface looks like a subset of DateFormat. Maybe someday someone will make this class
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* extend DateFormat.
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*
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* @author Bip Thelin
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* @author Dan Sandberg
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*/
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public class Strftime {
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protected static final Properties translate;
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protected final SimpleDateFormat simpleDateFormat;
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/**
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* Initialize our pattern translation
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*/
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static {
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translate = new Properties();
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translate.put("a","EEE");
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translate.put("A","EEEE");
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translate.put("b","MMM");
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translate.put("B","MMMM");
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translate.put("c","EEE MMM d HH:mm:ss yyyy");
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//There's no way to specify the century in SimpleDateFormat. We don't want to hard-code
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//20 since this could be wrong for the pre-2000 files.
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//translate.put("C", "20");
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translate.put("d","dd");
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translate.put("D","MM/dd/yy");
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translate.put("e","dd"); //will show as '03' instead of ' 3'
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translate.put("F","yyyy-MM-dd");
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translate.put("g","yy");
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translate.put("G","yyyy");
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translate.put("H","HH");
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translate.put("h","MMM");
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translate.put("I","hh");
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translate.put("j","DDD");
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translate.put("k","HH"); //will show as '07' instead of ' 7'
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translate.put("l","hh"); //will show as '07' instead of ' 7'
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translate.put("m","MM");
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translate.put("M","mm");
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translate.put("n","\n");
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translate.put("p","a");
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translate.put("P","a"); //will show as pm instead of PM
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translate.put("r","hh:mm:ss a");
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translate.put("R","HH:mm");
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//There's no way to specify this with SimpleDateFormat
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//translate.put("s","seconds since epoch");
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translate.put("S","ss");
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translate.put("t","\t");
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translate.put("T","HH:mm:ss");
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//There's no way to specify this with SimpleDateFormat
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//translate.put("u","day of week ( 1-7 )");
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//There's no way to specify this with SimpleDateFormat
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//translate.put("U","week in year with first Sunday as first day...");
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translate.put("V","ww"); //I'm not sure this is always exactly the same
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//There's no way to specify this with SimpleDateFormat
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//translate.put("W","week in year with first Monday as first day...");
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//There's no way to specify this with SimpleDateFormat
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//translate.put("w","E");
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translate.put("X","HH:mm:ss");
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translate.put("x","MM/dd/yy");
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translate.put("y","yy");
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translate.put("Y","yyyy");
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translate.put("Z","z");
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translate.put("z","Z");
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translate.put("%","%");
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}
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/**
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* Create an instance of this date formatting class
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*
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* @param origFormat the strftime-style formatting string
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* @param locale the locale to use for locale-specific conversions
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*/
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public Strftime( String origFormat, Locale locale ) {
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String convertedFormat = convertDateFormat( origFormat );
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simpleDateFormat = new SimpleDateFormat( convertedFormat, locale );
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}
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/**
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* Format the date according to the strftime-style string given in the constructor.
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*
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* @param date the date to format
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* @return the formatted date
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*/
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public String format( Date date ) {
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return simpleDateFormat.format( date );
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}
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/**
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* Get the timezone used for formatting conversions
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*
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* @return the timezone
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*/
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public TimeZone getTimeZone() {
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return simpleDateFormat.getTimeZone();
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}
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/**
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* Change the timezone used to format dates
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*
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* @param timeZone The new time zone
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* @see SimpleDateFormat#setTimeZone
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*/
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public void setTimeZone( TimeZone timeZone ) {
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simpleDateFormat.setTimeZone( timeZone );
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}
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/**
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* Search the provided pattern and get the C standard
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* Date/Time formatting rules and convert them to the
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* Java equivalent.
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*
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* @param pattern The pattern to search
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* @return The modified pattern
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*/
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protected String convertDateFormat( String pattern ) {
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boolean inside = false;
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boolean mark = false;
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boolean modifiedCommand = false;
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StringBuilder buf = new StringBuilder();
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for(int i = 0; i < pattern.length(); i++) {
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char c = pattern.charAt(i);
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if ( c=='%' && !mark ) {
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mark=true;
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} else {
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if ( mark ) {
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if ( modifiedCommand ) {
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//don't do anything--we just wanted to skip a char
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modifiedCommand = false;
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mark = false;
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} else {
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inside = translateCommand( buf, pattern, i, inside );
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//It's a modifier code
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if ( c=='O' || c=='E' ) {
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modifiedCommand = true;
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} else {
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mark=false;
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}
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}
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} else {
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if ( !inside && c != ' ' ) {
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//We start a literal, which we need to quote
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buf.append("'");
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inside = true;
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}
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buf.append(c);
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}
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}
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}
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if ( buf.length() > 0 ) {
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char lastChar = buf.charAt( buf.length() - 1 );
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if( lastChar!='\'' && inside ) {
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buf.append('\'');
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}
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}
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return buf.toString();
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}
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protected String quote( String str, boolean insideQuotes ) {
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String retVal = str;
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if ( !insideQuotes ) {
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retVal = '\'' + retVal + '\'';
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}
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return retVal;
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}
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/**
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* Try to get the Java Date/Time formatting associated with
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* the C standard provided.
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*
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* @param buf The buffer
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* @param pattern The date/time pattern
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* @param index The char index
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* @param oldInside Flag value
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* @return True if new is inside buffer
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*/
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protected boolean translateCommand( StringBuilder buf, String pattern, int index, boolean oldInside ) {
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char firstChar = pattern.charAt( index );
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boolean newInside = oldInside;
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//O and E are modifiers, they mean to present an alternative representation of the next char
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//we just handle the next char as if the O or E wasn't there
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if ( firstChar == 'O' || firstChar == 'E' ) {
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if ( index + 1 < pattern.length() ) {
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newInside = translateCommand( buf, pattern, index + 1, oldInside );
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} else {
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buf.append( quote("%" + firstChar, oldInside ) );
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}
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} else {
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String command = translate.getProperty( String.valueOf( firstChar ) );
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//If we don't find a format, treat it as a literal--That's what apache does
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if ( command == null ) {
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buf.append( quote( "%" + firstChar, oldInside ) );
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} else {
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//If we were inside quotes, close the quotes
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if ( oldInside ) {
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buf.append( '\'' );
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}
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buf.append( command );
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newInside = false;
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}
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}
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return newInside;
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}
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}
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