[ http://issues.apache.org/jira/browse/LANG-266?page=all ]
Stepan Koltsov updated LANG-266:
--------------------------------
Attachment: commons-lang-join-collection-stepancheg.diff
The patch.
Also hacks join(Iterator, *) to aviod creation of StringBuffer if iterator
gives zero or one elements.
> Wish for StringUtils.join(Collection, *)
> ----------------------------------------
>
> Key: LANG-266
> URL: http://issues.apache.org/jira/browse/LANG-266
> Project: Commons Lang
> Type: Wish
> Versions: Nightly Builds
> Reporter: Stepan Koltsov
> Priority: Trivial
> Attachments: commons-lang-join-collection-stepancheg.diff
>
> There is a lack of StringUtils.join(Collection, String) method in
> commons-lang. Could you please add it?
> Commons-lang has method join(Iterator, String), however join(Collection,
> String) is still useful. Join is used very often, and in most situations it
> is used with Collection, not with Iterator, because almost all methods return
> Collections, not Iterators and a lot of data is stored as Collections, not as
> Iterators. The string ".iterator()" has 11 characters while line for code is
> only 72 chars. I've found that in my code there are several methods that
> could be one line shorter if it was StringUtils.join(Collection, String).
> Compare:
> // with StringUtils.join(Collection, String)
> return "UNIQUE (" + StringUtils.join(unique.getColumnNames(), ", ") + ")";
> against:
> // without
> Iterator columnNames = unique.getColumnNames().iterator();
> return "UNIQUE (" + StringUtils.join(columnNames, ", ") + ")";
> Motivation is almost same as "Why we have StringUtils.join(Object[], String)
> while we could write StringUtils.join(Arrays.asList(array).iterator(),
> separator)?"
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