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https://issues.apache.org/jira/browse/VFS-218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Mario Ivankovits resolved VFS-218.
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Resolution: Invalid
Hi!
... and so does this code snippet
{code}
FileInputStream fis = new FileInputStream("C:/temp/bla.txt");
long skipped = fis.skip(9L);
System.out.println(skipped+" <= prints 9, this should be 6 as
per javadoc's specification; "+
"http://java.sun.com/j2se/1.5.0/docs/api/java/io/InputStream.html#skip(long)");
{code}
And this is due to a bug/feature in java [1] which has already been added to
the documentation of FileInputStream [2].
Clearly, FileInputStream breaks the contract of its interface.
Seems like you are out of luck.
Ciao,
Mario
[1] http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6294974
[2] http://java.sun.com/javase/6/docs/api/java/io/FileInputStream.html
> .skip() always returns the same number as given as parameter while the stream
> itself may or may not skip to given position
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: VFS-218
> URL: https://issues.apache.org/jira/browse/VFS-218
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 1.0
> Environment: Java 5, using jdk1.6.0_06 on Windows XP SP3
> Reporter: Not Telling
>
> The code below should reproduce the bug, so far I've tested this with file:
> and res: file systems and at least those two expose this bug. As you may
> notice from the source, you should have file called "bla.txt" containing
> "blabla" (6 characters) in your C:\temp\ folder for this.
> {code:title=VFSStreamSkipping.java}
> import java.io.IOException;
> import java.io.InputStream;
> import org.apache.commons.vfs.FileObject;
> import org.apache.commons.vfs.FileSystemException;
> import org.apache.commons.vfs.FileSystemManager;
> import org.apache.commons.vfs.VFS;
> /**
> * This class demonstrates buggy behaviour of .skip() when using VFS.
> * The bug is that no matter how many bytes were actually skipped, .skip()
> * always returns the same number as the user tried to skip. The stream itself
> * may get skipped though, if one tries to read the stream in this example
> * after .skip(), it will return -1 indicating that .skip() was executed
> * properly.
> */
> public class VFSStreamSkipping {
>
> public static void main(String[] args) {
> FileObject file;
> FileSystemManager fsm;
> try {
> fsm = VFS.getManager();
> } catch (FileSystemException e) {
> fsm = null;
> }
>
> InputStream is = null;
>
> try {
> file = fsm.resolveFile("file:C:/temp/bla.txt");
> // file content is simply "blabla" with no \n or \r
> is = file.getContent().getInputStream();
> } catch (FileSystemException e) {}
>
> try {
> long skipped = is.skip(9L);
> System.out.println(skipped+" <= prints 9, this should
> be 6 as per javadoc's specification; "+
>
> "http://java.sun.com/j2se/1.5.0/docs/api/java/io/InputStream.html#skip(long)");
>
> System.out.println(is.read());
> } catch (IOException e) {}
> }
> }
> {code}
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