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Hash::Dirty
Keep track of whether a hash is dirty or not

Hash::Dirty - Keep track of whether a hash is dirty or not


NAME

Hash::Dirty - Keep track of whether a hash is dirty or not


VERSION

Version 0.023


SYNOPSIS


    use Hash::Dirty;

    my %hash;

    tie %hash, qw/Hash::Dirty/, { a => 1 };

    (tied %hash)->is_dirty; # Nope, not dirty yet.

    $hash{a} = 1;

    (tied %hash)->is_dirty; # Still not dirty yet.

    $hash{b} = 2;

    (tied %hash)->is_dirty; # Yes, now it's dirty

    (tied %hash)->dirty_keys; # ( b )

    $hash{a} = "hello";

    (tied %hash)->dirty_keys; # ( a, b )

    (tied %hash)->dirty_values; # ( "hello", 2 )

    (tied %hash)->dirty } # { a => 1, b => 1 }

    (tied %hash)->reset;

    (tied %hash)->is_dirty; # Nope, not dirty anymore.

    $hash{c} = 3;

    (tied %hash)->is_dirty; # Yes, dirty again.

    # %hash is { a => "hello", b => 2, c => 3 }

    (tied %hash)->dirty_slice } # { c => 3 }

    # Alternately:

    use Hash::Dirty;

    my $hash = Hash::Dirty::hash;

    # Also:

    

    my ($object, $hash) = Hash::Dirty->new;

    

    $hash->{a} = 1; # Etc., etc.

    $object->is_dirty;


DESCRIPTION

Hash::Dirty will keep track of the dirty keys in a hash, letting you which values changed.

Currently, Hash::Dirty will only inspect a hash shallowly, that is, it does not deeply compare the contents of supplied values (say a HASH reference, ARRAY reference, or some other opaque object).

This module was inspired by DBIx::Class::Row

Currently, setting, deleting keys or clearing the hash means that the object will lose history, so it will know that something has changed, but not if it is reset back at some later date:


    my ($object, $hash) = Hash::Dirty->new({ a => 1 });

    $object->is_dirty; # Nope

    $hash->{a} = 2;

    $object->is_dirty; # Yup

    

    $hash->{a} = 1;

    $object->is_dirty; # Yup, still dirty, even though the original value was 1


EXPORTS

hash( <hash> )

Creates a new Hash::Dirty object and returns the tied hash reference, per Hash::Dirty->new.

If supplied, will use <hash> as the storage (initializing the object accordingly)


METHODS

Hash::Dirty->new( <hash> )

Creates and returns a new Hash::Dirty object

If supplied, will use <hash> as the storage (initializing the object accordingly)

In list context, new will return both the object and the ``regular'' hash:


    my ($object, $hash) = Hash::Dirty->new;

    $hash->{a} = 1;

    $object->is_dirty; # Yup, it's dirty

$object->hash

Returns a reference to the overlying hash

$object->is_dirty

Returns 1 if the hash is dirty at all, 0 otherwise

$object->is_dirty ( <key> )

Returns 1 if <key> is dirty, 0 otherwise

$object->is_dirty ( $key, $key, ..., )

Returns 1 if any <key> is dirty, 0 otherwise

$object->reset

Resets the hash to non-dirty status

This method affects the dirtiness only, it does not erase or alter the hash in anyway

$object->dirty

Returns a hash indicating which keys are dirty

In scalar context, returns a hash reference

$object->dirty_slice

Returns a hash slice containg only the dirty keys and values

In scalar context, returns a hash reference

$object->dirty_keys

Returns a list of dirty keys

$object->dirty_values

Returns a list of dirty values

$object->set( <key>, <value> )

$object->store( <key>, <value> )

$object->get( <key> )

$object->fetch( <key> )

$object->clear

$object->delete( <key> )


AUTHOR

Robert Krimen, <rkrimen at cpan.org>


BUGS

Please report any bugs or feature requests to bug-hash-dirty at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


SUPPORT

You can find documentation for this module with the perldoc command.


    perldoc Hash::Dirty

You can also look for information at:


ACKNOWLEDGEMENTS


COPYRIGHT & LICENSE

Copyright 2007 Robert Krimen, all rights reserved.

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

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