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=head1 NAME
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Utilities::HashDB - A type of database object.
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=head1 SYNOPSIS
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my $obj = Utilities::HashDB->new();
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=head1 METHODS
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=over
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=cut
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=item C<new()>
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Create a new HashDB object.
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=item C<setdata(data, @keys)>
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set a data item to the given keys.
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=item C<getdata(@keys)>
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return all data items that match the given keys.
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=item C<deletedata(@keys)>
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detete all data items that match the given keys.
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=item C<match(@keys)>
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return the full DataItem object refs that match keys.
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=item C<items()>
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return the number of seperate items in the store.
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=item C<store(filename)>
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dump to file.
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=item C<restore(filename)>
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restore from file.
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=item C<alias(\@refofkeys,\@aliaskeys)>
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attatch another set of keys to items that
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match the refopfkeys (note that these are
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references to the arrays).
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=item unalias(@aliaskeys)
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remove an alias.
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=back
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=head1 AUTHOR
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Originally Written by Christopher Williams.
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=head1 MAINTAINER
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Shaun ASHBY
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=cut
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package Utilities::HashDB;
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use Utilities::DataItem;
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use FileHandle;
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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->{dataitems}=();
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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->{dataitems}}, Utilities::DataItem->new($data, @keys);
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}
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sub alias {
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my $self=shift;
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my $keyref=shift;
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my $aliaskeys=shift;
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my @objs=$self->match(@{$keyref});
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foreach $obj ( @objs ) {
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$obj->alias(@{$aliaskeys});
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}
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}
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sub unalias {
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my $self=shift;
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my @keys=@_;
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my @objs=$self->match(@keys);
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foreach $obj ( @objs ) {
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$obj->unalias(@_);
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}
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}
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sub items {
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my $self=shift;
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return $#{$self->{dataitems}};
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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 $i ( @match ) {
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splice (@{$self->{dataitems}}, $i, 1 );
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}
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}
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sub match {
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my $self=shift;
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my @keys=@_;
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my @data=();
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my @match=$self->_match(@keys);
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foreach $i ( @match ) {
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push @data, $self->{dataitems}[$i];
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}
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return @data;
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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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my $i;
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foreach $i ( @match ) {
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push @data, ($self->{dataitems}[$i]->data());
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}
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return @data;
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}
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sub store {
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my $self=shift;
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my $filename=shift;
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my $fh=FileHandle->new();
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$fh->autoflush(1);
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open ($fh, ">$filename") or die "Unable to open file $filename\n $!\n";
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foreach $object ( @{$self->{dataitems}} ) {
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print $fh "\n";
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$object->store($fh);
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}
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close $fh;
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}
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sub restore {
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my $self=shift;
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my $filename=shift;
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my @arr=();
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my $data;
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my $fh=FileHandle->new();
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open ($fh, "<$filename") or die "Unable to open file $filename\n $!\n";
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while ( <$fh> ) {
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push @{$self->{dataitems}}, Utilities::DataItem->restore($fh);
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}
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close $fh;
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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 @matches=();
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my $data;
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for ( $i=0; $i<=$#{$self->{dataitems}}; $i++ ) {
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$data=$self->{dataitems}[$i];
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if ( $data->match(@keys) ) {
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push @matches, $i;
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}
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}
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return @matches;
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}
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