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Commons Lang

Wiki Markup\[http://jakarta.apache.org/commons/lang Lang\] aims to provide:

• Comprehensive String handling utilities
• Enumerated types (pre JDK 1.5)
• Nested exceptions (pre JDK 1.4)
• Builders to create hashCode, equals, toString and compareTo methods
• Utilities for Object, Date and Numbers
  

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The Javadoc of the latest version (2.1) is \[http://jakarta.apache.org/commons/lang/api/index.html available\]. Wiki Markup

The Javadoc of the CVS version (development) is \[http://jakarta.apache.org/commons/lang/apidocs/index.html available\].

Development plan for 2.2

Release the text package and bug fixes.

Seeking opinions (2.1)

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=22692 22692\]	[StringUtils].split ignores empty items - *new splitPreserveAllTokens Needs to be reviewed.*

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1. Bug fixes
2. StrTokenizer
3. StrBuilder
4. VariableFormatter/interpolator - 18962
   
   

Other ideas

1. Wiki Markup

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   [21663|http://issues.apache.org/bugzilla/show_bug.cgi?id=

   15082 15082\] \[lang\] elapsed time formatting utility method - *DurationFormatUtils.*
2. DateUtils.isSameDay()
DurationUtils ISO_EXTENDED_FORMAT uses FastDateFormat. This has problems with padding of years. See commented TODO in DurationFormatUtils. - No longer uses FastDateFormat. Instead it uses the DurationFormatUtils format code, of which a new variant has been added

Pushed back (2.1)

1. Wiki Markup\[http://issues.apache.org/bugzilla/show_bug.cgi?id=

   21663

   21663\

   ] \[lang\] Add support in [ToStringStyle] for [DateFormat]. - *Grows quickly into commons-convert*

2. Wiki Markup

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   [27643|http://issues.apache.org/bugzilla/show_bug.cgi?id=

   27643

   27643

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   ] \[lang\]\[patch\] [ClassUtils].newInstance method - *Seems unnecessary*

3. Wiki Markup

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   [29149|http://issues.apache.org/bugzilla/show_bug.cgi?id=29149

   29149\

   ] \[lang\] [StringEscapeUtils].unescapeHtml() doesn't handle an empty entity - *Empty entity is in fact illegal HTML, so need to decide if we should ignore. Current behaviour seems acceptable as we're not in the work with bad HTML market.*

   StringBuffer replacement - Probably 2.2/3.0. A lot of work in this I'd imagine.

4. Wiki Markup

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   [26659|http://issues.apache.org/bugzilla/show_bug.cgi?id=

   26659

   26659

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   ] \[lang\] add method to [DateUtils] to get the distance between 2 dates - *Mainly replicated by [DurationFormatUtils], or non-obvious*

5. Wiki Markup

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   [29692|http://issues.apache.org/bugzilla/show_bug.cgi?id=29692

   29692\

   ] \[lang\] String indentation feature request - *Needs design as a non-simple problem*

6. Wiki Markup

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   [22172|http://issues.apache.org/bugzilla/show_bug.cgi?id=22172

   22172\

   ] \[lang\] [DateUtils].parseCVS behavior parsing "h:mm z" - *Moved to sandbox*

7. Wiki Markup

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   [26297|http://issues.apache.org/bugzilla/show_bug.cgi?id=

   26297

   26297

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   ] \[lang\] [BitSetUtils] class, toIndexArray and fromIndexArray

   Wiki Markup\[http://issues.apache.org/bugzilla/show_bug.cgi?id=26922 26922\] \[lang\] public static boolean [DateUtils].equals(Date dt1, Date dt2)

8. Wiki Markup\[http://issues.apache.org/bugzilla/show_bug.cgi?id=21333 21333\] Add [TimeoutController] - *Class in [HttpClient]. Leaving til 3.0 as not much movement on it*

9. Wiki Markup

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   [30674|http://issues.apache.org/bugzilla/show_bug.cgi?id=30674

   30674\

   ] Support [HttpClient]'s [DateParser] class - *This is basically a Date parseDate(String dateValue, String\[\] dateFormats) method.*

10. Wiki Markup
    \[http://issues.apache.org/bugzilla/show_bug.cgi?id=15082 15082\] \[lang\] elapsed time formatting utility method - *DurationFormatUtils. Needs finishing.*

11. New text package with Interpolation class moved there and MappedMessageFormat from code in Digester.

12. Wiki Markup
    \[http://issues.apache.org/bugzilla/show_bug.cgi?id=18962 18962\] \[lang\] New Method: getSubstitutedValues( String, Map ) - *org.apache.commons.lang.text.Interpolation available for opinions* \\ \\

Resolved list (2.1)

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=30929 30929\]     \[lang\] Nestable.indexOfThrowable(Class)uses Class.equals() to match - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=27592 27592\] 	\[lang\] [WordUtils] capitalize improvement - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=23557 23557\] 	[WordUtils].capitalizeFully(String str) should take a delimiter - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=27778 27778\] 	\[lang\] add remove methods to [ArrayUtils] - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=25227 25227\] 	\[lang\] [StringEscapeUtils].unescapeHtml() doesn't handle hex entities - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=27640 27640\] 	\[lang\]\[patch\] [ClassUtils].primitivesToWrappers method - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=23749 23749\] 	\[lang\] \[PATCH\] [NumberRange] - adds inclusive and exclusive end points - *WONTFIX*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=27876 27876\] 	\[lang\] [ReflectionToStringBuilder].toString(null) throws exception by design - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=27877 27877\] 	\[lang\]\[patch\] Make [ClassUtils] methods null-safe and not throw an IAE. - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=29673 29673\] 	\[lang\] [ExceptionUtils]: new getCause() methodname (for tomcat-exception) - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=25560 25560\]	[DateUtils].truncate() is off by one hour when using a date in DST switch 'zone' - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=19331 19331\] 	\[lang\] General case: infinite loop: [ToStringBuilder].reflectionToString - *The bugzilla entry* *_Gary Gregory 2003-06-23 17:27_* *shows this to have been fixed.*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=29294 29294\] 	\[lang\]\[PATCH\] Fix the Fraction class - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=29794 29794\] 	Add convenience format(long) methods to [FastDateFormat] - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=28468 28468\] 	[StringUtils].defaultString: Documentation error - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=22489 22489\] 	\[lang\]patch\] [StringUtils].isAsciiPrintable() - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=26646 26646\] 	\[lang\] [FastDateFormat].getDateInstance(int, Locale) always uses the pattern from the first invocation - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=31181 31181\]  [FastDateFormat] year bug - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=32198 32198\]    	\[lang\] Error in [JavaDoc] for [StringUtils].chomp(String, String) - *DONE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=22717 22717\] 	\[lang\] [MutableNumbers] - *see lang.mutable.* - *COMPLETE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=30334 30334\] 	\[lang\] New class proposal: *CharacterEncoding* - *COMPLETE*

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\[http://issues.apache.org/bugzilla/show_bug.cgi?id=29163 29163\]	Make [StopWatch] validate state transitions - *COMPLETE*

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2. LocaleUtils - including toLocale(String,String)
3. CloneUtils - multiple ways to clone an object
   

Articles

This article http://www.devx.com/Java/Article/29392/0/page/6 discusses some of the interesting classes in Commons Lang with real world examples.