| 1 |
#
|
| 2 |
# HashDB.pm
|
| 3 |
#
|
| 4 |
# Originally Written by Christopher Williams
|
| 5 |
#
|
| 6 |
# Description
|
| 7 |
#
|
| 8 |
# Interface
|
| 9 |
# ---------
|
| 10 |
# new() : A new HashDB object
|
| 11 |
# setdata(data, @keys) : set a data item to the given keys
|
| 12 |
# getdata(@keys) : return all data items that match the given keys
|
| 13 |
# deletedata(@keys) : detete all data items that match the given keys
|
| 14 |
# items() : return the number of seperate items in the store
|
| 15 |
|
| 16 |
package Utilities::HashDB;
|
| 17 |
require 5.001;
|
| 18 |
|
| 19 |
sub new {
|
| 20 |
my $class=shift;
|
| 21 |
$self={};
|
| 22 |
bless $self, $class;
|
| 23 |
$self->{datahash}=();
|
| 24 |
$self->{datakey}=();
|
| 25 |
return $self;
|
| 26 |
}
|
| 27 |
|
| 28 |
sub setdata {
|
| 29 |
my $self=shift;
|
| 30 |
my $data=shift;
|
| 31 |
my @keys=@_;
|
| 32 |
|
| 33 |
push @{$self->{datakey}}, [ @keys ];
|
| 34 |
push @{$self->{datahash}}, $data;
|
| 35 |
}
|
| 36 |
|
| 37 |
sub items {
|
| 38 |
my $self=shift;
|
| 39 |
return $#{$self->{datahash}};
|
| 40 |
}
|
| 41 |
|
| 42 |
|
| 43 |
sub getdata {
|
| 44 |
my $self=shift;
|
| 45 |
my @keys=@_;
|
| 46 |
|
| 47 |
my @data=();
|
| 48 |
my @match=$self->_match(@keys);
|
| 49 |
foreach $d ( @match ) {
|
| 50 |
push @data, $self->{datahash}[$d];
|
| 51 |
}
|
| 52 |
return @data;
|
| 53 |
}
|
| 54 |
|
| 55 |
sub deletedata {
|
| 56 |
my $self=shift;
|
| 57 |
my @keys=@_;
|
| 58 |
|
| 59 |
# first get all the keys we want to delete
|
| 60 |
my @match=$self->_match(@keys);
|
| 61 |
foreach $i ( @match ) {
|
| 62 |
print $i;
|
| 63 |
splice ( @{$self->{datahash}}, $i, 1 );
|
| 64 |
splice ( @{$self->{datakey}}, $i, 1 );
|
| 65 |
}
|
| 66 |
}
|
| 67 |
|
| 68 |
# ------------------- Support Routines ------------
|
| 69 |
# returns list of array indices of items matching the keys
|
| 70 |
sub _match {
|
| 71 |
my $self=shift;
|
| 72 |
my @keys=@_;
|
| 73 |
|
| 74 |
my $i;
|
| 75 |
my @matchold;
|
| 76 |
my @matchnew;
|
| 77 |
# At the start everything matches
|
| 78 |
for ( $i=0; $i<=$self->items(); $i++ ) {
|
| 79 |
if ( $#{$self->{datakey}[$i]} >= $#keys ) {
|
| 80 |
push @matchold, $i;
|
| 81 |
}
|
| 82 |
}
|
| 83 |
|
| 84 |
# now test against keys
|
| 85 |
for ( $i=0; $i <= $#keys; $i++ ) {
|
| 86 |
undef @matchnew;
|
| 87 |
foreach $dn ( @matchold ){
|
| 88 |
if ( $self->{datakey}[$dn][$i] eq $keys[$i] ) {
|
| 89 |
push @matchnew,$dn;
|
| 90 |
#print "match at $dn $keys[$i]\n";
|
| 91 |
}
|
| 92 |
}
|
| 93 |
@matchold=@matchnew;
|
| 94 |
}
|
| 95 |
return @matchold; # list of array indecies
|
| 96 |
}
|
| 97 |
|
