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#
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# DataItem.pm
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#
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# Originally Written by Christopher Williams
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#
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# Description
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# -----------
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# A data container with a list of lookup keys
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#
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# Interface
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# ---------
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# new(data,@key) : A new DataItem object with the data matched to a keylist
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# (See also restore)
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# keys() : return a list of the fundamental keys for the data object
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# data() : return the data for the object
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# match(@keys) : return 1 if @keys matches those of the data item, else 0
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# alias(@keys) : provide an alternative set of keys for matching
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# unalias(@keys) : remove any aliases - original keys cannot be removed
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# returns 1 if successful, 0 otherwise
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# store(fh) : store to the given stream
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# restore(fh) : Returns a new dataitem, initialised to the data found in
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# fh
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package Utilities::DataItem;
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require 5.001;
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sub new {
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my $class=shift;
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my $data=shift;
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my @keys=@_;
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$self={};
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bless $self, $class;
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$self->{data}=$data;
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push @{$self->{keys}[0]},@keys; # fundamental keys
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return $self;
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}
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sub keys {
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my $self=shift;
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return @{$self->{keys}[0]};
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}
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sub data {
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my $self=shift;
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return $self->{data};
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}
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sub match {
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my $self=shift;
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my @keys=@_;
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my $nm;
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# search over all key aliases
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foreach $keyset ( @{$self->{keys}} ) {
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$nm=0;
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for ( $i=0; (($i <= $#keys) && ($i <=$#{$keyset} )); $i++ ) {
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if ( $$keyset[$i] eq $keys[$i] ) {
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$nm++;
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}
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}
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return 1 , if ( $nm > $#keys ); # Succesful match
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}
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return 0;
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}
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sub alias {
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my $self=shift;
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my @keys=@_;
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if ( $#keys<0 ) {
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die "Unable to set an alias with no keys\n";
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}
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push @{$self->{keys}},[@keys];
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}
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sub unalias {
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my $self=shift;
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my @keys=@_;
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my $rv=0;
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for ( my $i=1; $i<=$#{$self->{keys}}; $i++ ) {
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if ( "@{$self->{keys}[$i]}" eq "@keys" ) {
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undef $self->{keys}[$i];
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splice( @{$self->{keys}}, $i, 1);
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$rv=1;
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}
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}
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return $rv;
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}
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sub store {
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my $self=shift;
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my $fh=shift;
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# print the keys first, aliases, then the data
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foreach $keyset ( @{$self->{keys}} ) {
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foreach $key ( @{$keyset} ) {
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print $fh "#".$key."\n";
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}
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print $fh "#\n"; # alias marker
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}
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print $fh ">".$self->data()."\n";
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}
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sub restore {
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my $class=shift;
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my $fh=shift;
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$self={};
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bless $self, $class;
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my @arr=();
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while ( <$fh> ) {
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chomp;
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if ( $_ eq "#") { # set aliases
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$self->alias(@arr);
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@arr=();
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}
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elsif ( $_=~/^#(.*)/ ) {
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push @arr, $1;
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}
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elsif ( $_=~/^>(.*)/ ) { # load in data
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$data=$1;
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$self->{data}=$data;
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last;
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}
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else {
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print "Data corruption detected\n";
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last;
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}
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}
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return $self;
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}
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