[jira] [Resolved] (LANG-536) Add isSorted() to ArrayUtils

["Duncan Jones (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duncan Jones resolved LANG-536.
-------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: Review Patch)
                   3.4

Author: djones
Date: Sun Oct 19 05:52:37 2014
New Revision: 1632874

URL: http://svn.apache.org/r1632874
Log:
LANG-536 - Add isSorted() to ArrayUtils. Patch supplied by James Sawle. Closes #32 in GitHub.

Modified:
    commons/proper/lang/trunk/pom.xml
    commons/proper/lang/trunk/src/changes/changes.xml
    commons/proper/lang/trunk/src/main/java/org/apache/commons/lang3/ArrayUtils.java
    commons/proper/lang/trunk/src/main/java/org/apache/commons/lang3/BooleanUtils.java
    commons/proper/lang/trunk/src/main/java/org/apache/commons/lang3/CharUtils.java
    commons/proper/lang/trunk/src/main/java/org/apache/commons/lang3/math/NumberUtils.java
    commons/proper/lang/trunk/src/test/java/org/apache/commons/lang3/ArrayUtilsTest.java
    commons/proper/lang/trunk/src/test/java/org/apache/commons/lang3/BooleanUtilsTest.java
    commons/proper/lang/trunk/src/test/java/org/apache/commons/lang3/CharUtilsTest.java
    commons/proper/lang/trunk/src/test/java/org/apache/commons/lang3/math/NumberUtilsTest.java

> Add isSorted() to ArrayUtils
> ----------------------------
>
>                 Key: LANG-536
>                 URL: https://issues.apache.org/jira/browse/LANG-536
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Sergei Ivanov
>            Assignee: Duncan Jones
>            Priority: Minor
>             Fix For: 3.4
>
>         Attachments: LANG-536.diff, perftest.zip
>
>
> In my unit tests I often need to verify that an array is correctly sorted.
> In order to achieve this, I've got two helper methods as follows.
> Is it possible to integrate these methods into ArrayUtils?
> {code}
>     /**
>      * Checks that the specified array of objects is in an ascending order
>      * according to the specified comparator.  All elements in the array must be
>      * <i>mutually comparable</i> by the specified comparator (that is,
>      * <tt>c.compare(e1, e2)</tt> must not throw a <tt>ClassCastException</tt>
>      * for any elements <tt>e1</tt> and <tt>e2</tt> in the array).
>      *
>      * @param a the array to be checked.
>      * @param c the comparator to determine the order of the array.  A
>      * <tt>null</tt> value indicates that the elements'
>      * {@linkplain Comparable natural ordering} should be used.
>      * @return {@code true}, if the array is sorted; {@code false}, otherwise.
>      * @throws ClassCastException if the array contains elements that are
>      * not <i>mutually comparable</i> using the specified comparator.
>      */
>     public static <T> boolean isSorted(final T[] a, final Comparator<? super T> c) {
>         if (a.length <= 1) {
>             // Empty or singleton arrays are always sorted
>             return true;
>         }
>         // Otherwise, check that every element is not smaller than the previous
>         T previous = a[0];
>         for (int i = 1, n = a.length; i < n; i++) {
>             final T current = a[i];
>             if (c.compare(previous, current) > 0) {
>                 return false;
>             }
>             previous = current;
>         }
>         return true;
>     }
>     /**
>      * Checks that the specified array of objects is in an ascending order,
>      * according to the {@linkplain Comparable natural ordering} of its elements.
>      * All elements in the array must implement the {@link Comparable} interface.
>      * Furthermore, all elements in the array must be <i>mutually comparable</i>
>      * (that is, <tt>e1.compareTo(e2)</tt> must not throw a <tt>ClassCastException</tt>
>      * for any elements <tt>e1</tt> and <tt>e2</tt> in the array).
>      *
>      * @param a the array to be checked.
>      * @return {@code true}, if the array is sorted; {@code false}, otherwise.
>      * @throws ClassCastException if the array contains elements that are not
>      * <i>mutually comparable</i> (for example, strings and integers).
>      */
>     @SuppressWarnings({"unchecked"})
>     public static <T> boolean isSorted(final T[] a) {
>         if (a.length <= 1) {
>             // Empty or singleton arrays are always sorted
>             return true;
>         }
>         // Otherwise, check that every element is not smaller than the previous
>         T previous = a[0];
>         for (int i = 1, n = a.length; i < n; i++) {
>             final T current = a[i];
>             if (((Comparable<? super T>) previous).compareTo(previous) > 0) {
>                 return false;
>             }
>             previous = current;
>         }
>         return true;
>     }
> {code}



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