Data::CompositeHash -
Nothing exported by default
This module requires these other modules and libraries:
Error::Simple Error::Programatic Perl::Module Data::Hub::Util Data::Hub::Container
This example will not abort:
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2', b=>'b2'}; my $h3 = {a=>'a3', b=>'b3', c=>'c3'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->push($h3); # We now have a composite stack with prescedence: $h1, $h2, $h3 # Where $h2 is the default hash $ch->{a} = 'AA'; $ch->{b} = 'BB'; $ch->{c} = 'CC'; $ch->{d} = 'DD'; die unless $h1->{a} eq 'AA'; die unless $h2->{b} eq 'BB'; die unless $h3->{c} eq 'CC'; die unless $h2->{d} eq 'DD'; # set on default hash b/c 'd' did not exist
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2', b=>'b2'}; my $h3 = {a=>'a3', b=>'b3', c=>'c3'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->push($h3); # We now have a composite stack with prescedence: $h1, $h2, $h3 # Where $h2 is the default hash die unless $ch->{a} eq 'a1'; die unless $ch->{b} eq 'b2'; die unless $ch->{c} eq 'c3'; die unless ref($ch->{'/'});
This example:
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2', b=>'b2'}; my $h3 = {a=>'a3', b=>'b3', c=>'c3'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->push($h3); join '', sort values %$ch;
will return:
a1b2c3
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2', b=>'b2'}; my $h3 = {a=>'a3', b=>'b3', c=>'c3'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->push($h3); die unless exists $$ch{a}; die unless exists $$ch{b}; die unless exists $$ch{c}; die if exists $$ch{d};
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2', b=>'b2'}; my $h3 = {a=>'a3', b=>'b3', c=>'c3'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->push($h3); delete $ch->{a}; delete $ch->{b}; delete $ch->{c}; join '', sort values %$ch;
a2b3
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2', b=>'b2'}; my $h3 = {a=>'a3', b=>'b3', c=>'c3'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->push($h3); %$ch = (); join '', sort values %$ch;
a2b2
This example will return true:
my $h2 = {a=>'a2', b=>'b2'}; my $ch = Data::CompositeHash->new($h2); scalar(%$ch);
This example will return false:
my $h2 = {a=>'a2', b=>'b2'}; my $ch = Data::CompositeHash->new($h2); $ch->pop; scalar(%$ch);
use Data::CompositeHash; my $h1 = { 'a' => 'argon', }; my $h2 = { 'a' => 'apple', 'b' => 'banana', 'c' => 'cherry', }; my $h3 = { 'c' => 'cyan', 'd' => 'dark brown', }; my $result = ''; # Create a composite hash, using $h2 as the default hash my $ch = Data::CompositeHash->new($h2); # Add $h1 as a hash which will overried values in $h2 $ch->unshift($h1); # Add $h3 as a hash with the least prescedence $ch->push($h3); # Fetch some values $result .= $ch->{a} . "\n"; $result .= $ch->{b} . "\n"; $result .= $ch->{c} . "\n"; $result .= $ch->{d} . "\n"; # Set an ambiguous value $result .= "--\n"; $ch->{a} = 'aluminium'; $result .= $h1->{a} . "\n"; # contains new value $result .= $h2->{a} . "\n"; # not touched # Set an ambiguous value $result .= "--\n"; $ch->{c} = 'cantelope'; $result .= $h2->{c} . "\n"; # contains new value $result .= $h3->{c} . "\n"; # not touched # Setting a value which is not defined in any hash sets # it on the defalut hash $result .= "--\n"; $ch->{e} = 'edible fruit'; $result .= $h2->{e};
argon banana cherry dark brown -- aluminium apple -- cantelope cyan -- edible fruit
use Data::CompositeHash;
This example will abort:
# no default hash provided my $ch = Data::CompositeHash->new();
This example will not return a defined value:
my $h2 = {a=>'a2'}; my $ch = Data::CompositeHash->new($h2); $ch->shift; $ch->{a};
my $h1 = {a=>'a1'}; my $h2 = {a=>'a2'}; my $ch = Data::CompositeHash->new($h2); $ch->unshift($h1); $ch->{a};
a1
my $h2 = {a=>'a2'}; my $h3 = {a=>'a3'}; my $ch = Data::CompositeHash->new($h2); $ch->push($h3); $ch->{a};
a2
my $h2 = {a=>'a2'}; my $ch = Data::CompositeHash->new($h2); $ch->pop; $ch->{a};
Ryan Gies <ryangies@cpan.org>
Copyright (C) 2014-2016 by Ryan Gies. All rights reserved. Copyright (C) 2006-2013 by Livesite Networks, LLC. All rights reserved. Copyright (C) 2000-2005 by Ryan Gies. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. * Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. * The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. To the best of our knowledge, no patented algorithms have been used. However, we do not have the resources to carry out a patent search, and therefore cannot give any guarantee of the above statement.
To install Data::Hub, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Data::Hub
CPAN shell
perl -MCPAN -e shell install Data::Hub
For more information on module installation, please visit the detailed CPAN module installation guide.