hash::case::preserve(3pm) [debian man page]

Hash::Case::Preserve(3pm)				User Contributed Perl Documentation				 Hash::Case::Preserve(3pm)

NAME

       Hash::Case::Preserve - hash with enforced lower cased keys

INHERITANCE

	Hash::Case::Preserve
	  is a Hash::Case
	  is a Tie::StdHash

SYNOPSIS

	use Hash::Case::Preserve;
	tie my(%cphash), 'Hash::Case::Preserve';
	$cphash{StraNGeKeY} = 3;
	print keys %cphash;	    # StraNGeKeY
	print $cphash{strangekey};  # 3
	print $cphash{STRANGEKEY};  # 3

DESCRIPTION

       Hash::Case::Preserve extends Hash::Case, which lets you play various trics with hash keys. This extension implements a fake hash which is
       case-insentive. The keys are administered in the casing as they were used: case-insensitive but case-preserving.

METHODS

   Constructors
       $obj->addHashData(HASH)
	   See "Constructors" in Hash::Case

       $obj->addPairs(PAIRS)
	   See "Constructors" in Hash::Case

       $obj->setHash(HASH)
	   See "Constructors" in Hash::Case

       tie(HASH, 'Hash::Case::Preserve', [VALUES,] OPTIONS)
	   Define HASH to be case insensitive, but case preserving.  The hash is initialized with the VALUES, specified as ref-array (passing a
	   list of key-value pairs) or ref-hash.

	   OPTIONS is a list of key/value pairs, which specify how the hash must handle preservation.  Current options:

	    -Option--Default
	     keep    'LAST'

	   keep => 'FIRST' | 'LAST'
	     Which casing is the preferred casing?  The FIRST appearance or the LAST.  Only stores will affect the casing, deletes will undo the
	     definition.  Defaults to LAST, which is slightly faster.

SEE ALSO

       This module is part of Hash-Case distribution version 1.02, built on March 09, 2012. Website: http://perl.overmeer.net/hash-case/

LICENSE

       Copyrights 2002-2003,2007-2012 by Mark Overmeer. For other contributors see ChangeLog.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  See
       http://www.perl.com/perl/misc/Artistic.html

perl v5.14.2							    2012-03-09						 Hash::Case::Preserve(3pm)

Hash::WithDefaults(3pm) 				User Contributed Perl Documentation				   Hash::WithDefaults(3pm)

NAME

       Hash::WithDefaults - class for hashes with key-casing requirements supporting defaults

       version 0.05

SYNOPSIS

	 use Hash::WithDefaults;

	 %main = ( ... );
	 tie %h1, 'Hash::WithDefaults', {...};
	 tied(%h1)->AddDefault(\%main);
	 tie %h2, 'Hash::WithDefaults', [...];
	 tied(%h2)->AddDefault(\%main);

	 # now if you use $h1{$key}, the value is looked up first
	 # in %h1, then in %main.

DESCRIPTION

       This module implements hashes that support "defaults". That is you may specify several more hashes in which the data will be looked up in
       case it is not found in the current hash.

   Object creation
	       tie %hash, 'Hash::WithDefault', [$case_option], [\%values];
	       tie %hash, 'Hash::WithDefault', [$case_option], [@values];
	       tie %hash, 'Hash::WithDefault', [$case_option], [%values];

       The optional $case_option may be one of these values:

	 Sensitive     - the hash will be case sensitive
	 Tolower       - the hash will be case sensitive, all keys are made lowercase
	 Toupper       - the hash will be case sensitive, all keys are made uppercase
	 Preserve      - the hash will be case insensitive, the case is preserved
	 Lower - the hash will be case insensitive, all keys are made lowercase
	 Upper - the hash will be case insensitive, all keys are made uppercase

       If you pass a hash or array reference or an even list of keys and values to the tie() function, those keys and values will be COPIED to the
       resulting magical hash!

       After you tie() the hash, you use it just like any other hash.

   Functions
       AddDefault

	       tied(%hash)->AddDefault(\%defaults);

       This instructs the object to include the %defaults in the search for values.  After this the value will be looked up first in %hash itself
       and then in %defaults.

       You may keep modifying the %defaults and your changes WILL be visible through %hash!

       You may add as many defaults to one Hash::WithDefaults object as you like, they will be searched in the order you add them.

       If you delete a key from the tied hash, it's only deleted from the list of specific keys, the defaults are never modified through the tied
       hash. This means that you may get a default value for a key after you deletethe key from the tied hash!

       GetDefaults

	       $defaults = tied(%hash)->GetDefaults();
	       push @$defaults, \%another_default;

       Returns a reference to the array that stores the defaults.  You may delete or insert hash references into the array, but make sure you
       NEVER EVER insert anything else than a hash reference into the array!

   Config::IniHash example
	 use Config::IniHash;
	 $config = ReadIni $inifile, withdefaults => 1, case => 'preserve';

	 if (exists $config->{':default'}) {
	   my $default = $config->{':default'};
	   foreach my $section (keys %$config) {
	     next if $section =~ /^:/;
		 tied(%{$config->{$section}})->AddDefault($default)
	   }
	 }

       And now all normal sections will get the default values from [:default] section ;-)

AUTHOR

       Jan Krynicky <Jenda@Krynicky.cz> http://Jenda.Krynicky.cz

COPYRIGHT

       Copyright (c) 2002-2009 Jan Krynicky <Jenda@Krynicky.cz>. All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-05-26						   Hash::WithDefaults(3pm)