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Posted to issues@commons.apache.org by "Loic Guibert (JIRA)" <ji...@apache.org> on 2015/04/26 14:55:38 UTC
[jira] [Created] (LANG-1119) Add rotate(string, int) method to
StringUtils
Loic Guibert created LANG-1119:
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Summary: Add rotate(string, int) method to StringUtils
Key: LANG-1119
URL: https://issues.apache.org/jira/browse/LANG-1119
Project: Commons Lang
Issue Type: New Feature
Components: lang.*
Reporter: Loic Guibert
Add a method to rotate (circular shift) a String into StringUtils.
{code:java}
/**
* <p>Rotate (circular shift) a String of {@code shift} characters.</p>
* <ul>
* <li>If {@code shift > 0}, right circular shift (ex : ABCDEF => FABCDE)</li>
* <li>If {@code shift < 0}, left circular shift (ex : ABCDEF => BCDEFA)</li>
* </ul>
*
* <pre>
* StringUtils.rotate(null, *) = null
* StringUtils.rotate("", *) = ""
* StringUtils.rotate("abcdefg", 0) = "abcdefg"
* StringUtils.rotate("abcdefg", 2) = "fgabcde"
* StringUtils.rotate("abcdefg", -2) = "cdefgab"
* StringUtils.rotate("abcdefg", 7) = "abcdefg"
* StringUtils.rotate("abcdefg", -7) = "abcdefg"
* StringUtils.rotate("abcdefg", 9) = "fgabcde"
* StringUtils.rotate("abcdefg", -9) = "cdefgab"
* </pre>
*
* @param str the String to rotate, may be null
* @param shift number of time to shift (positive : right shift, negative : left shift)
* @return the rotated String,
* or the original String if {@code shift == 0},
* or {@code null} if null String input
*/
public static String rotate(String str, int shift);
{code}
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