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From "Matt Lachman (JIRA)" <j...@apache.org>
Subject [jira] Created: (NET-244) Add a FTPClient.listFiles(FTPFileFilter) method
Date Tue, 18 Nov 2008 15:55:44 GMT
Add a FTPClient.listFiles(FTPFileFilter) method
-----------------------------------------------

                 Key: NET-244
                 URL: https://issues.apache.org/jira/browse/NET-244
             Project: Commons Net
          Issue Type: New Feature
    Affects Versions: 2.0
            Reporter: Matt Lachman
            Priority: Minor


It would be nice if there was a way to list *only* those files I'm interested in.  I've had
to write a loop a couple of times to figure out which files had the right naming conventions.
 If the API handled that for me, I would have less boilerplate code to write.

I would attach a patch but as of this time I cannot download the source due to an internal
server error.

I was imagining the introduction of a new interface {{org.apache.commons.net.ftp.FTPFileFilter}}
that would be analogous to [java.io.FileFilter|http://java.sun.com/javase/6/docs/api/java/io/FileFilter.html]:
{code}
package org.apache.commons.net.ftp;

public interface FTPFileFilter {
   public boolean accept(FTPFile file);
}
{code}

A new method on FTPClient would need to be created to support it.  Here's a code sample using
API calls:
{code}
public FTPFile[] listFiles(FTPFileFilter filter) throws IOException {
   FTPFile files = listFIles();
   List<FTPFile> fileList = new ArrayList<FTPFile>(files.length);
   for (FTPFile file : files) {
      if (filter.accept(file)) {
         fileList.add(file);
      }
   }
   return fileList.toArray(new FTPFile[fileList.size()]);
}
{code}

See [java.io.File.listFiles(java.io.FileFilter)|http://java.sun.com/javase/6/docs/api/java/io/File.html#listFiles(java.io.FileFilter)]
for comparison.

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