Re: File Copy
Parth Malwankar wrote: On Nov 24, 12:34 am, Stuart Sierra [EMAIL PROTECTED] wrote: Honestly, for this kind of low-level stuff I always use the Apache Commons libraries, http://commons.apache.org/, esp. the Lang and IO components. They've got every imaginable stream function, all carefully and efficiently implemented. But if you're determined to do it in Clojure, loop/recur is the way, as James demonstrated. -Stuart Sierra Yes. commons.io.FileUtils.copyFile is definitely a nicer way :) I am still learning Java (as an when I need it for Clojure). Thanks for the pointer. From another learner --really a java-ignoramus-extremus: Would someone take pity and give a clojure recipe for using commons.io.FileUtils.copyFile to copy fileA to fileB (say). I have found and installed commons.io via package manager and it ended up in /usr/share/java/commons-io.jar. Was that the right thing to do? The rest of java seems to live under /usr/java/jdk1.6.0_10/ I am starting REPL via the rlwrap script posted on the wiki. My first stumbling block seems to be how to do the import! :-( TIA, ..jim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: File Copy
Ok, first you need to add the commons-io.jar to the Java classpath. You can do this by editing the Clojure startup script. The argument to -cp is a colon-separated list of directories and/or JAR files to go on the classpath. So if the command line was this: java -cp /path/to/clojure.jar clojure.lang.Repl Now it will be: java -cp /usr/share/java/commons-io.jar:/path/to/clojure.jar clojure.lang.Repl (Note: this may also be possible with the add-classpath function in Clojure, but I'm not sure if that still exists/works.) Once you've done this, restart Clojure and you should be able to (import '(org.apache.commons.io FileUtils)) Then call (FileUtils/copyFile fileA fileB) fileA and fileB should be instances of java.io.File. Hope this gets you where you need to be. :) -Stuart Sierra On Nov 24, 2:26 am, James G. Sack (jim) [EMAIL PROTECTED] wrote: Parth Malwankar wrote: On Nov 24, 12:34 am, Stuart Sierra [EMAIL PROTECTED] wrote: Honestly, for this kind of low-level stuff I always use the Apache Commons libraries, http://commons.apache.org/, esp. the Lang and IO components. They've got every imaginable stream function, all carefully and efficiently implemented. But if you're determined to do it in Clojure, loop/recur is the way, as James demonstrated. -Stuart Sierra Yes. commons.io.FileUtils.copyFile is definitely a nicer way :) I am still learning Java (as an when I need it for Clojure). Thanks for the pointer. From another learner --really a java-ignoramus-extremus: Would someone take pity and give a clojure recipe for using commons.io.FileUtils.copyFile to copy fileA to fileB (say). I have found and installed commons.io via package manager and it ended up in /usr/share/java/commons-io.jar. Was that the right thing to do? The rest of java seems to live under /usr/java/jdk1.6.0_10/ I am starting REPL via the rlwrap script posted on the wiki. My first stumbling block seems to be how to do the import! :-( TIA, ..jim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: File Copy
Michael Wood wrote: On Mon, Nov 24, 2008 at 10:34 PM, James G. Sack (jim) [EMAIL PROTECTED] wrote: [...] == FYI add_classpath works fine. As a curiosity, I notice that (System/getProperty java.class.path) does not reflect any change after add-classpath. == I wonder if this is as it should be? And if so, I am left wondering how to determine the real value of the current classpath. For possible benefit to other newbies, this is what I came up with for inclusion in (say) user.clj. (criticism welcome) Apparently such use of add-classpath is discouraged: http://groups.google.com/group/clojure/browse_thread/thread/87f40ee8788d54dd/11d4e82c3da1beb7?lnk=gstq=%22Such+use+of+add-classpath+is+discouraged%22#11d4e82c3da1beb7 ok... thanks. I /am/ left believing I'll remain confused about this part of java for a while longer. :-( I was hoping that I could somehow tell java to look in (eg) the /usr/share/java tree when trying to resolve imports. If someone can direct me where I can educate myself about this aspect of java, libs, and jar-files a bit more, that would be appreciated. Otherwise I don't mean to hijack this list for general java questions. Regards, ..jim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
File Copy
Hello,
I am trying to translate the following Java
snippet into a file copy routine in Clojure.
public static void copy(InputStream in, OutputStream out)throws
IOException {
byte[] buffer = new byte[1024];
while (true) {
int bytesRead = in.read(buffer);
if (bytesRead == -1) break;
out.write(buffer, 0, bytesRead);
}
}
I was barely able to start:
(defn copy [iname oname]
(let [in (new FileInputStream iname)
out (new FileOutputStream oname)]
nil))
But now I am totally lost at the nil. I am not sure how to translate
the while loop.
I would appreciate any pointers on how to do this (or maybe a more
ideomatic
way).
Thanks.
Parth
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