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https://issues.apache.org/jira/browse/FTPSERVER-351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839965#action_12839965
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DevNull43 commented on FTPSERVER-351:
-------------------------------------
After trying to implement my own sorting method, due list comes already sorted
by name and immutable, I get:
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableList$1.set(Collections.java:1244)
at java.util.Collections.sort(Collections.java:221)
at
org.apache.ftpserver.command.impl.listing.DirectoryLister.sortFilesByDate(DirectoryLister.java:85)
at
org.apache.ftpserver.command.impl.listing.DirectoryLister.traverseFiles(DirectoryLister.java:47)
at
org.apache.ftpserver.command.impl.listing.DirectoryLister.listFiles(DirectoryLister.java:132)
at org.apache.ftpserver.command.impl.LIST.execute(LIST.java:126)
> LIST and NLIST duplicates comparator if implementing your own sorting.
> ----------------------------------------------------------------------
>
> Key: FTPSERVER-351
> URL: https://issues.apache.org/jira/browse/FTPSERVER-351
> Project: FtpServer
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.3
> Reporter: DevNull43
> Priority: Critical
>
> LIST and NLIST commands sort Files by name, first directories and then files.
> LIST only takes argument -a
> NLIST only takes argument -a and -l
> Sorting must be done also by SIZE and DATE.
> The comparator for sorting files by name is located in
> org/apache/ftpserver/filesystem/nativefs/impl/NativeFtpFile.java inside
> method listFiles().
> This is wrong if we want to overwrite DirectoryListener to add more arguments
> for ordering by SIZE or DATE.
> NativeFtpFile should not run comparator to avoid running it twice.
> The RFC does not require different sorting options, however when number of
> files is big, sorting by size of date is a must.
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