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Article written about the 2.5 release 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@931453 13f79535-47bb-0310-9956-ffa450edef68
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Henri Yandell 2010-04-07 07:20:25 +00:00
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<?xml version="1.0"?>
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<document>
<properties>
<title>What's new in Commons Lang 2.5?</title>
<author email="dev@commons.apache.org">Commons Documentation Team</author>
</properties>
<body>
<section name="What's new in Commons Lang 2.5?">
<p>Commons Lang 2.5 is out, and the obvious question is: <i>"So what? What's changed?"</i>.</p>
<p>This article aims to briefly cover the changes and save you from having to dig through each JIRA
issue to see what went on in the two years of development between Lang 2.4 and 2.5.</p>
<p>Two years?!? Yes, it's true. The reason is that 2.5 represents the backwards compatible changes in the
nearly complete Java-5 focused Lang 3.0. </p>
<section name="Deprecations">
<p>There were no new deprecations in 2.5. </p>
</section>
<section name="The build">
<p>2.5 was built using Sun's 1.6.0_17 JVM, but targets Java 1.3. </p>
</section>
<section name="New classes">
<p>A new org.apache.commons.lang.reflect package was added, accumulating common high-level uses of the java.lang.reflect APIs. The
classes, hopefully self-evident in nature, were pulled together from the existing BeanUtils and the unreleased Reflect components.
The classes are: </p>
<ul>
<li>ConstructorUtils - primarily creating new instances of classes</li>
<li>FieldUtils - primarily reading and writing to Object/Class fields</li>
<li>MethodUtils - primarily methods to make invoking methods simpler</li>
</ul>
<p>You can read more about the classes in their
<a href="LANG_2_5/src/main/java/org/apache/commons/lang/reflect//MemberUtils.java">javadoc</a>. </p>
</section>
<section name="New fields">
<p>With both Java 7 and Windows 7 becoming a reality,
<a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/SystemUtils.html">SystemUtils</a> was updated to
provide boolean fields for both versions. </p>
</section>
<section name="New methods">
<p>There were 66 new methods added to existing Commons Lang classes. </p>
<p>The <a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/ArrayUtils.html">ArrayUtils</a> class
received two new types of methods. Firstly, a boolean isNotEmpty(array) set of methods, identifying whether the particular
array is null or an empty sized array. This makes it the inverse of the existing isEmpty(array) methods. Secondly, an array
nullToEmpty(array) set of methods that converts null or empty arrays to a singleton empty array already available from the
ArrayUtils class. Non null/empty arrays are left untouched. </p>
<p>The constructor for the
<a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/CharRange.html">CharRange</a> class is somewhat
confusing. It takes a boolean parameter that when set to true means the CharRange is negated. To make code easier to read, the
following static helper methods were added: </p>
<ul>
<li>public org.apache.commons.lang.CharRange is(char)</li>
<li>public org.apache.commons.lang.CharRange isIn(char, char)</li>
<li>public org.apache.commons.lang.CharRange isNot(char)</li>
<li>public org.apache.commons.lang.CharRange isNotIn(char, char)</li>
</ul>
<p>An iterator() method was also added to provide another way of walking the range. </p>
<p>The <a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/builder/EqualsBuilder.html">EqualsBuilder</a>
obtained a new reset() method to allow for reuse, while the
<a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/builder/HashCodeBuilder.html">HashCodeBuilder</a>
received a hashCode() method that returns the built hash code instead of the natural hash code of the builder object itself. It
doesn't really matter what the builder chooses to use as a hash code and this stops accidental use of the hashCode() instead of
toHashCode() method from causing lots of pain. </p>
<p>Helper isFalse(), isTrue() and toBoolean() methods were added to
<a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/mutable/MutableBoolean.html">MutableBoolean</a>,
while the other mutable classes received String argument constructors. </p>
<p>Lastly, the <a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/time/DateUtils.html">DateUtils</a>
class received a new ceiling set of methods to truncate upwards, and a parseDateStrictly method to parse a Date with the
supplied DateFormat classes leniency set to false. </p>
</section>
<section name="StringUtils methods">
<p>As with 2.4, the
<a href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/StringUtils.html">StringUtils</a> class has
grown and we cover its new methods in its own section. </p>
<ul>
<li>abbreviateMiddle(String, String, int);String - This method turns aRatherLongNameSuchAsAFileName into 'aRatherLo...AFileName'.
This is often desirable when you want to restrict the length of a name, but you can afford to have quite long names. </li>
<li>indexOfIgnoreCase(String, String);int - An indexOf method that ignores the case of what it's matching. Matching lastIndexOfIgnoreCase and 'start at index' variants were also added. </li>
<li>lastOrdinalIndexOf(String, String, int);int - A matching variant for the already exisitng ordinalIndexOf method - they
support finding the Nth indexOf instead of the first time the search term is found. </li>
<li>isAllLowerCase(String);boolean - Is the String all lower case. </li>
<li>isAllUpperCase(String);boolean - Is the String all upper case. </li>
<li>lowerCase(String, Locale);String - Null protected toLowerCase methods for the platform independent inclined. </li>
<li>upperCase(String, Locale);String - Null protected toUpperCase methods for the platform independent inclined. </li>
<li>repeat(String, String, int);String - Repeat option that includes an optional separator. </li>
<li>startsWithAny(String, String[]);boolean - Does the specified String start with any of the supplied values. </li>
</ul>
</section>
<section name="What's fixed in Lang 2.5?">
<p>Per the <a href="upgradeto2_5.html">release notes</a> there are 32 bugs fixed in Lang 2.5. Some highlights are: </p>
<ul>
<li><a href="http://issues.apache.org/jira/browse/LANG-477">LANG-477</a> - fixing an OutOfMemoryError in ExtendedMessageFormat. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-76">LANG-76</a> - EnumUtils.getEnum() doesn't work well in 1.5. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-204">LANG-204</a> and
<a href="http://issues.apache.org/jira/browse/LANG-506">LANG-506</a> - Multithread improvements to the package private Entities
class, used behind the scenes by StringEscapeUtils. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-511">LANG-511</a> - Improve performance by deferring LocalUtils initialization. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-523">LANG-523</a> - Two orders of magnitude performance improvement in StrBuilder. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-467">LANG-467</a> - Reverted the change to EqualsBuilder in Lang 2.4 to
specially handle BigDecimal. While useful, it put things out of sync with HashCodeBuilder. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-586">LANG-586</a> - Use of a ThreadLocal in HashCodeBuilder and
ToStringStyle meant that containers could end up with memory leaks. This was rewritten to avoid this. </li>
<li><a href="http://issues.apache.org/jira/browse/LANG-472">LANG-472</a> - RandomUtils.nextLong() was returning only even numbers. Fans of Java-based roulette wheels can breathe a sigh of relief. </li>
</ul>
</section>
<section name="So long, farewell...">
<p>Hopefully that was all of interest. Don't forget to download <a href="http://commons.apache.org/lang/download_lang.cgi">Lang 2.5</a>, or, for the Maven repository users, upgrade your &lt;version&gt; tag to 2.5. Please feel free to raise any questions you might have on the <a href="mail-lists.html">mailing lists</a>, and report bugs or enhancements in the <a href="issue-tracking.html">issue tracker</a>.</p>
</section>
</section>
</body>
</document>