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https://issues.apache.org/jira/browse/LUCENE-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844906#action_12844906
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Marvin Humphrey commented on LUCENE-2316:
-----------------------------------------
Is it really necessary to obtain the length of a file from the Directory? Lucy
doesn't implement that functionality, and we haven't missed it -- we're able
to get away with using the length() method on InStream and OutStream.
I see that IndexInput and IndexOutput already have length() methods. Can you
simply eliminate all uses of Directory.fileLength() within core and deprecate
it without introducing a new method?
> Define clear semantics for Directory.fileLength
> -----------------------------------------------
>
> Key: LUCENE-2316
> URL: https://issues.apache.org/jira/browse/LUCENE-2316
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Shai Erera
> Priority: Minor
> Fix For: 3.1
>
>
> On this thread:
> http://mail-archives.apache.org/mod_mbox/lucene-java-dev/201003.mbox/%3c126142c1003121525v24499625u1589bbef4c079...@mail.gmail.com%3e
> it was mentioned that Directory's fileLength behavior is not consistent
> between Directory implementations if the given file name does not exist.
> FSDirectory returns a 0 length while RAMDirectory throws FNFE.
> The problem is that the semantics of fileLength() are not defined. As
> proposed in the thread, we'll define the following semantics:
> * Returns the length of the file denoted by <code>name</code> if the file
> exists. The return value may be anything between 0 and Long.MAX_VALUE.
> * Throws FileNotFoundException if the file does not exist. Note that you can
> call dir.fileExists(name) if you are not sure whether the file exists or not.
> For backwards we'll create a new method w/ clear semantics. Something like:
> {code}
> /**
> * @deprecated the method will become abstract when #fileLength(name) has
> been removed.
> */
> public long getFileLength(String name) throws IOException {
> long len = fileLength(name);
> if (len == 0 && !fileExists(name)) {
> throw new FileNotFoundException(name);
> }
> return len;
> }
> {code}
> The first line just calls the current impl. If it throws exception for a
> non-existing file, we're ok. The second line verifies whether a 0 length is
> for an existing file or not and throws an exception appropriately.
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