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williamc |
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#
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# HashDB.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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# Interface
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# ---------
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# new() : A new HashDB object
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# setdata(data, @keys) : set a data item to the given keys
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# getdata(@keys) : return all data items that match the given keys
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# deletedata(@keys) : detete all data items that match the given keys
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# items() : return the number of seperate items in the store
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package Utilities::HashDB;
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require 5.001;
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sub new {
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my $class=shift;
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$self={};
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bless $self, $class;
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$self->{datahash}=();
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$self->{datakey}=();
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return $self;
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}
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sub setdata {
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my $self=shift;
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my $data=shift;
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my @keys=@_;
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push @{$self->{datakey}}, [ @keys ];
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push @{$self->{datahash}}, $data;
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}
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sub items {
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my $self=shift;
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return $#{$self->{datahash}};
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}
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sub getdata {
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my $self=shift;
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my @keys=@_;
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my @data=();
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my @match=$self->_match(@keys);
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foreach $d ( @match ) {
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push @data, $self->{datahash}[$d];
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}
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return @data;
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}
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sub deletedata {
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my $self=shift;
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my @keys=@_;
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# first get all the keys we want to delete
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my @match=$self->_match(@keys);
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foreach $i ( @match ) {
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print $i;
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splice ( @{$self->{datahash}}, $i, 1 );
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splice ( @{$self->{datakey}}, $i, 1 );
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}
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}
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# ------------------- Support Routines ------------
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# returns list of array indices of items matching the keys
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sub _match {
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my $self=shift;
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my @keys=@_;
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my $i;
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my @matchold;
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my @matchnew;
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# At the start everything matches
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for ( $i=0; $i<=$self->items(); $i++ ) {
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if ( $#{$self->{datakey}[$i]} >= $#keys ) {
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push @matchold, $i;
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}
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}
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# now test against keys
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for ( $i=0; $i <= $#keys; $i++ ) {
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undef @matchnew;
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foreach $dn ( @matchold ){
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if ( $self->{datakey}[$dn][$i] eq $keys[$i] ) {
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push @matchnew,$dn;
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#print "match at $dn $keys[$i]\n";
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}
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}
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@matchold=@matchnew;
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}
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return @matchold; # list of array indecies
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}
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