[ http://issues.apache.org/jira/browse/LANG-269?page=all ]
Scott Johnson updated LANG-269:
-------------------------------
Attachment: StringUtils.patch
Interesting problem...
Here's a patch that adds two new methods to StringUtils.
The first is a new method indexOfDifference(String[]). It's very similar to
indexOfDifference(String,String) except it operates on an array of Strings.
(It actually uses indexOfDifference(String, String) internally.)
The second method is called getCommonPrefix (String[]) which does what Michael
requested. It calls indexOfDifference(String[]) to find the position of the
first difference, then returns the beginning character sequence that is shared
between all of the strings.
Both methods handle null arrays, null array entries and empty Strings.
Let me know what you think.
> Shouldn't Commons Lang's StringUtils have a "common" string method?
> -------------------------------------------------------------------
>
> Key: LANG-269
> URL: http://issues.apache.org/jira/browse/LANG-269
> Project: Commons Lang
> Type: New Feature
> Environment: generic
> Reporter: Michael Dang
> Fix For: 3.0
> Attachments: StringUtils.patch
>
> A method which accepts a string array and returns a string which is the
> common portion of all the strings starting from the left, or more general
> form of that.
> This is very common operation. For example, one may want to find the common
> directory of a set of path strings.
> passing in:
> "/foo/f1.txt"
> "/foo/moo/f2.txt"
> "/foo/moo/f3.txt"
> should returns "/foo/"
> It is tedious to implement this in every project. And I think Commons Lang
> StringUtils should have some methods to help in this.
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