[jboss-jira] [JBoss JIRA] Closed: (JBVFS-162) FileSystem.getSize() should support 'unknown' length

[David Lloyd (JIRA)]

     [ https://jira.jboss.org/browse/JBVFS-162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Lloyd closed JBVFS-162.
-----------------------------

      Assignee: David Lloyd  (was: John Bailey)
    Resolution: Rejected


Unfortunately this is difficult or impossible to support universally.  Here's what the docs say about the two underlying methods we use for this:

    java.io.File#length() - "[Returns] the length, in bytes, of the file denoted by this abstract pathname, or 0L if the file does not exist. Some operating systems may return 0L for pathnames denoting system-dependent entities such as devices or pipes."

    java.util.zip.ZipEntry#getSize() - "[Returns] the uncompressed size of the entry data, or -1 if not known"

So java.io.File returns 0 for unknown; we cannot differentiate between file not found vs. directory vs. something else without using multiple operations, which are not atomic and thus might fail in unexpected ways.

This issue can be revisited once Java 7 is required for AS, as the new filesystem API should offer considerably more flexibility on this score.

> FileSystem.getSize() should support 'unknown' length
> ----------------------------------------------------
>
>                 Key: JBVFS-162
>                 URL: https://jira.jboss.org/browse/JBVFS-162
>             Project: JBoss VFS
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>            Reporter: Aslak Knutsen
>            Assignee: David Lloyd
>
> When working with a Stream based FileSystem the size of the Stream could be unknown until streamed. FileSystem.getSize() forces writing the data to local disk to figure out the size (or stream it to '/dev/null' ).
> FileSystem.getSize() supports a return type of '0L' to indicate a 'directory'. In the same fashion, it could match up with e.g. URLConnection.getContentLength() and support '-1L' to indicate a 'unknown size'.

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