| 1 |
=head1 NAME
|
| 2 |
|
| 3 |
Utilities::HashDB - A type of database object.
|
| 4 |
|
| 5 |
=head1 SYNOPSIS
|
| 6 |
|
| 7 |
my $obj = Utilities::HashDB->new();
|
| 8 |
|
| 9 |
=head1 METHODS
|
| 10 |
|
| 11 |
=over
|
| 12 |
|
| 13 |
=cut
|
| 14 |
|
| 15 |
=item C<new()>
|
| 16 |
|
| 17 |
Create a new HashDB object.
|
| 18 |
|
| 19 |
=item C<setdata(data, @keys)>
|
| 20 |
|
| 21 |
set a data item to the given keys.
|
| 22 |
|
| 23 |
=item C<getdata(@keys)>
|
| 24 |
|
| 25 |
return all data items that match the given keys.
|
| 26 |
|
| 27 |
=item C<deletedata(@keys)>
|
| 28 |
|
| 29 |
detete all data items that match the given keys.
|
| 30 |
|
| 31 |
=item C<match(@keys)>
|
| 32 |
|
| 33 |
return the full DataItem object refs that match keys.
|
| 34 |
|
| 35 |
=item C<items()>
|
| 36 |
|
| 37 |
return the number of seperate items in the store.
|
| 38 |
|
| 39 |
=item C<store(filename)>
|
| 40 |
|
| 41 |
dump to file.
|
| 42 |
|
| 43 |
=item C<restore(filename)>
|
| 44 |
|
| 45 |
restore from file.
|
| 46 |
|
| 47 |
=item C<alias(\@refofkeys,\@aliaskeys)>
|
| 48 |
|
| 49 |
attatch another set of keys to items that
|
| 50 |
match the refopfkeys (note that these are
|
| 51 |
references to the arrays).
|
| 52 |
|
| 53 |
=item unalias(@aliaskeys)
|
| 54 |
|
| 55 |
remove an alias.
|
| 56 |
|
| 57 |
=back
|
| 58 |
|
| 59 |
=head1 AUTHOR
|
| 60 |
|
| 61 |
Originally Written by Christopher Williams.
|
| 62 |
|
| 63 |
=head1 MAINTAINER
|
| 64 |
|
| 65 |
Shaun ASHBY
|
| 66 |
|
| 67 |
=cut
|
| 68 |
|
| 69 |
package Utilities::HashDB;
|
| 70 |
use Utilities::DataItem;
|
| 71 |
use FileHandle;
|
| 72 |
require 5.001;
|
| 73 |
|
| 74 |
sub new {
|
| 75 |
my $class=shift;
|
| 76 |
$self={};
|
| 77 |
bless $self, $class;
|
| 78 |
$self->{dataitems}=();
|
| 79 |
return $self;
|
| 80 |
}
|
| 81 |
|
| 82 |
sub setdata {
|
| 83 |
my $self=shift;
|
| 84 |
my $data=shift;
|
| 85 |
my @keys=@_;
|
| 86 |
|
| 87 |
push @{$self->{dataitems}}, Utilities::DataItem->new($data, @keys);
|
| 88 |
}
|
| 89 |
|
| 90 |
sub alias {
|
| 91 |
my $self=shift;
|
| 92 |
my $keyref=shift;
|
| 93 |
my $aliaskeys=shift;
|
| 94 |
|
| 95 |
my @objs=$self->match(@{$keyref});
|
| 96 |
foreach $obj ( @objs ) {
|
| 97 |
$obj->alias(@{$aliaskeys});
|
| 98 |
}
|
| 99 |
}
|
| 100 |
|
| 101 |
sub unalias {
|
| 102 |
my $self=shift;
|
| 103 |
my @keys=@_;
|
| 104 |
|
| 105 |
my @objs=$self->match(@keys);
|
| 106 |
foreach $obj ( @objs ) {
|
| 107 |
$obj->unalias(@_);
|
| 108 |
}
|
| 109 |
}
|
| 110 |
|
| 111 |
sub items {
|
| 112 |
my $self=shift;
|
| 113 |
return $#{$self->{dataitems}};
|
| 114 |
}
|
| 115 |
|
| 116 |
sub deletedata {
|
| 117 |
my $self=shift;
|
| 118 |
my @keys=@_;
|
| 119 |
|
| 120 |
# first get all the keys we want to delete
|
| 121 |
my @match=$self->_match(@keys);
|
| 122 |
foreach $i ( @match ) {
|
| 123 |
splice (@{$self->{dataitems}}, $i, 1 );
|
| 124 |
}
|
| 125 |
}
|
| 126 |
|
| 127 |
sub match {
|
| 128 |
my $self=shift;
|
| 129 |
my @keys=@_;
|
| 130 |
|
| 131 |
my @data=();
|
| 132 |
my @match=$self->_match(@keys);
|
| 133 |
foreach $i ( @match ) {
|
| 134 |
push @data, $self->{dataitems}[$i];
|
| 135 |
}
|
| 136 |
return @data;
|
| 137 |
}
|
| 138 |
|
| 139 |
sub getdata {
|
| 140 |
my $self=shift;
|
| 141 |
my @keys=@_;
|
| 142 |
|
| 143 |
my @data=();
|
| 144 |
my @match=$self->_match(@keys);
|
| 145 |
my $i;
|
| 146 |
foreach $i ( @match ) {
|
| 147 |
push @data, ($self->{dataitems}[$i]->data());
|
| 148 |
}
|
| 149 |
return @data;
|
| 150 |
}
|
| 151 |
|
| 152 |
sub store {
|
| 153 |
my $self=shift;
|
| 154 |
my $filename=shift;
|
| 155 |
|
| 156 |
my $fh=FileHandle->new();
|
| 157 |
$fh->autoflush(1);
|
| 158 |
open ($fh, ">$filename") or die "Unable to open file $filename\n $!\n";
|
| 159 |
foreach $object ( @{$self->{dataitems}} ) {
|
| 160 |
$object->store($fh);
|
| 161 |
}
|
| 162 |
close $fh;
|
| 163 |
}
|
| 164 |
|
| 165 |
sub restore {
|
| 166 |
my $self=shift;
|
| 167 |
my $filename=shift;
|
| 168 |
my @arr=();
|
| 169 |
my $data;
|
| 170 |
my $fh=FileHandle->new();
|
| 171 |
local *FH=$fh;
|
| 172 |
|
| 173 |
if ($fh->open("<$filename"))
|
| 174 |
{
|
| 175 |
# my $line;
|
| 176 |
# while ($line = $fh->getline())
|
| 177 |
while (defined $fh)
|
| 178 |
{
|
| 179 |
push @{$self->{dataitems}}, Utilities::DataItem->restore($fh);
|
| 180 |
}
|
| 181 |
}
|
| 182 |
|
| 183 |
# open ($fh, "<$filename") or die "Unable to open file $filename\n $!\n";
|
| 184 |
|
| 185 |
#while ( <$fh> ) {
|
| 186 |
# { print "...HashDB: in while loop","\n";
|
| 187 |
# push @{$self->{dataitems}}, Utilities::DataItem->restore($fh);
|
| 188 |
# }
|
| 189 |
close $fh;
|
| 190 |
#print "end restore","\n";
|
| 191 |
}
|
| 192 |
|
| 193 |
# ------------------- Support Routines ------------
|
| 194 |
# returns list of array indices of items matching the keys
|
| 195 |
|
| 196 |
sub _match {
|
| 197 |
my $self=shift;
|
| 198 |
my @keys=@_;
|
| 199 |
|
| 200 |
my @matches=();
|
| 201 |
my $data;
|
| 202 |
for ( $i=0; $i<=$#{$self->{dataitems}}; $i++ ) {
|
| 203 |
$data=$self->{dataitems}[$i];
|
| 204 |
if ( $data->match(@keys) ) {
|
| 205 |
push @matches, $i;
|
| 206 |
}
|
| 207 |
}
|
| 208 |
return @matches;
|
| 209 |
}
|
