in reply to Re^2: Setting up conditional check for printing out keys from array/hash ref
in thread Setting up conditional check for printing out keys from array/hash ref

The sample solution I offered is not in itself recursive, although it could be the guts of a recursive solution.

given/when is Perl's switch statement support which was introduced with 5.10. A switch statement is really just syntactic sugar for a set of related if statements so you can replace the when blocks with if blocks:

for my $result ($lsResults1, $lsResults2) {
    for (keys %$result) {
        if ($_ eq 'file') {
            print "Filename: $result->{file}{path}\n";
            print "    Size: $result->{file}{size}\n";
        } elsif ($_ eq 'directory') {
            my $value = ref $result->{directory};

            if ($value eq 'ARRAY') {
                for my $entry (@{$result->{directory}}) {
                    print "Directory: $entry->{path}\n";
                }
            } elsif ($value eq 'HASH') {
                print "Directory: $result->{directory}{path}\n";
            }
        }
    }
}

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Re^4: Setting up conditional check for printing out keys from array/hash ref
by JaeDre619 (Acolyte) on Oct 27, 2011 at 23:41 UTC
    Thanks Grandfather! It works nicely. I am doing some testing on it right now.

    There's a point in the directory (where I go higher up in directory) where I see this messageBad index while coercing array into hash

    What's a good way to handle that message?

    Output:

    $ ./tst-loopthrough2.pl --dir /work/eng
Bad index while coercing array into hash at ./tst-loopthrough2.pl line
+ 101.
$ ./tst-loopthrough2.pl --dir /work/eng/feeds
Directory: /work/eng/feeds
Directory: /work/eng/feeds/customer_care
$ ./tst-loopthrough2.pl --dir /work/eng/feeds/customer_care
Directory: /work/eng/feeds/customer_care
Directory: /work/eng/feeds/customer_care/abc
Directory: /work/eng/feeds/customer_care/def
Directory: /work/eng/feeds/customer_care/test
$ ./tst-loopthrough2.pl --dir /work/eng/feeds/customer_care/test
Filename: /work/eng/feeds/customer_care/test/q_data_20111023.dat
    Size: 379085
Directory: /work/eng/feeds/customer_care/test

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      The sample code I provided is fewer than 100 lines including the sample hash initialisation. That is less than the line containing the error according to your error message so I can't easily tell where the error is happening. Perhaps you'd like to modify the data in my sample code to reproduce the error then post that?

      True laziness is hard work
[reply]

        Thanks Grandfather. I did what you said and copied the dump output and added it to your code. It worked. What might be the problem is my config for using XML::Simple for reading the xml?

        Here is the setting for XML::Simple 
        my $data = $xml->XMLin(`$lsCmd`, ForceArray => 1);

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        Here is the additional hash output. 
        my $lsResults3 = {
          'recursive' => 'no',
          'version' => '0.20.202.1.1101050227',
          'time' => '2011-10-28T20:54:09+0000',
          'filter' => '.*',
          'path' => '/',
          'directory' => [
                         {
                           'owner' => 'hdfs',
                           'group' => 'hdfs',
                           'permission' => 'drwxr-xr-x',
                           'path' => '/',
                           'accesstime' => '1970-01-01T00:00:00+0000',
                           'modified' => '2011-10-06T19:30:33+0000'
                         },
                         {
                           'owner' => 'xyz',
                           'group' => 'hdfs',
                           'permission' => 'drwx------',
                           'path' => '/A29',
                           'accesstime' => '1970-01-01T00:00:00+0000',
                           'modified' => '2011-10-06T19:30:38+0000'
                         },
                         {
                           'owner' => 'rawk',
                           'group' => 'hdfs',
                           'permission' => 'drwx------',
                           'path' => '/B29TABTV001',
                           'accesstime' => '1970-01-01T00:00:00+0000',
                           'modified' => '2011-02-08T22:24:15+0000'
                         },
                         {
                           'owner' => 'xyz',
                           'group' => 'hdfs',
                           'permission' => 'drwx------',
                           'path' => '/FOOBAR',
                           'accesstime' => '1970-01-01T00:00:00+0000',
                           'modified' => '2010-10-04T10:44:17+0000'
                         },
                         {
                           'owner' => 'xyz',
                           'group' => 'hdfs',
                           'permission' => 'drwxr-xr-x',
                           'path' => '/data',
                           'accesstime' => '1970-01-01T00:00:00+0000',
                           'modified' => '2011-08-25T07:56:15+0000'
                         },
                         {
                           'owner' => 'hdfs',
                           'group' => 'hdfs',
                           'permission' => 'drwxr-xr-x',
                           'path' => '/user',
                           'accesstime' => '1970-01-01T00:00:00+0000',
                           'modified' => '2011-10-25T04:21:55+0000'
                         }
                       ],
          'exclude' => ''
};

for my $result ($lsResults1, $lsResults2, $lsResults3) {
    for (keys %$result) {
        if ($_ eq 'file') {
            print "Filename: $result->{file}{path}\n";
            print "    Size: $result->{file}{size}\n";
        } elsif ($_ eq 'directory') {
            my $value = ref $result->{directory};

            if ($value eq 'ARRAY') {
                for my $entry (@{$result->{directory}}) {
                    print "Directory: $entry->{path}\n";
                }
            } elsif ($value eq 'HASH') {
                print "Directory: $result->{directory}{path}\n";
            }
        }
    }
}

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