Hi Steven,
I thought of that too. Yes, it can even be a BiPredicate<Path, IOException>:
http://cr.openjdk.java.net/~plevart/jdk9-dev/Files.walkIOException/webrev.02/
If one of the proposed APIs is acceptable, I can push this further and
add required test(s), etc...
Regards, Peter
On 07/02/2015 07:11 PM, Steven Schlansker wrote:
How about BiConsumer<Path, IOException>, unless the Path is easily accessible
otherwise?
On Jul 2, 2015, at 6:56 AM, Peter Levart <peter.lev...@gmail.com> wrote:
Hi,
Recently I wanted to use Files.walk method returning a Stream<Path> to scan a
directory of files. I quickly learned that it is of limited use. For example, the
following code:
long pngFilesCount = Files.walk(Paths.get("/usr"))
.filter(path -> path.toString().endsWith(".png"))
.count();
Throws exception on my computer:
Exception in thread "main" java.io.UncheckedIOException:
java.nio.file.AccessDeniedException: /usr/share/polkit-1/rules.d
This is a consequence of the fact that some files and/or directories in the
tree being scanned are not accessible to my user account on the computer. If I
wanted to skip those files/directories I would be forced to use different API
(Files.walkFileTree using FileVisitor which can handle exceptions too).
I propose the addition of overloads to Files.walk and Files.find that take an
additional parameter of type Consumer<IOException> to be responsible for
handling IOExceptions that are thrown while walking the file tree:
http://cr.openjdk.java.net/~plevart/jdk9-dev/Files.walkIOException/webrev.01/
Ignoring AccessDeniedException(s) in above code can therefore be coded as:
long pngFilesCount = Files.walk(Paths.get("/usr"), Integer.MAX_VALUE,
ioe -> {
if (!(ioe instanceof AccessDeniedException)) {
throw new UncheckedIOException(ioe);
}
})
.filter(path -> path.toString().endsWith(".png"))
.count();
What do you think?
Regards, Peter
