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49
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1 package CDBI::Map;
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2 use strict;
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3 use Common;
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4
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5 BEGIN {
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6 DeclareProperty _Cache => ACCESS_NONE;
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7 DeclareProperty _HoldingType => ACCESS_NONE;
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8 }
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9
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10 sub _KeyValuePairClass {
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11 my $this = shift;
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12 ($this->{$_HoldingType} = ref $this ) =~ s/^((?:\w+::)*)Map(\w+)$/${1}MapItem${2}/ unless $this->{$_HoldingType};
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13 return $this->{$_HoldingType};
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14 }
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15
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16 # при загрузке кеша нельзя грузить KeyValuePair поскольку получатся циклические ссылки:(
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17 sub GetCache {
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18 my $this = shift;
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19
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20 if (not $this->{$_Cache}) {
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21 $this->{$_Cache} = { map { $_->ItemKey, { id => $_->id, value => $_->Value} } $this->_KeyValuePairClass->search(Parent => $this) };
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22 }
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23
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24 return $this->{$_Cache};
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25 }
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26
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27 sub Keys {
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28 my $this = shift;
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29 return wantarray ? keys %{$this->GetCache} : [keys %{$this->GetCache}];
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30 }
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31
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32 sub Item {
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33 my ($this,$key,$value,%options) = @_;
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34
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35 die new Exception('A key must be specified') unless defined $key;
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36
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37 if (@_ > 2) {
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38 # set
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39 if (my $pairInfo = $this->GetCache->{$key}) {
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40 # update
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41 my $pair = $this->_KeyValuePairClass->retrieve($pairInfo->{id});
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42 if (defined $value or $options{'keepnull'}) {
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43 $pair->Value($value);
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44 $pair->update;
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45 $pairInfo->{value} = $value;
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46 } else {
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47 #delete
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48 $pair->delete;
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49 delete $this->GetCache->{$key};
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50 }
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51 } else {
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52 if ( defined $value or $options{'keepnull'}) {
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53 my $pair = $this->_KeyValuePairClass->insert( {Parent => $this, ItemKey => $key, Value => $value } );
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54 $this->GetCache->{$key} = {id => $pair->id, value => $value };
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55 }
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56 }
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57 return $value;
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58 } else {
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59 # get
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60 if (my $pairInfo = $this->GetCache->{$key}) {
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61 return $pairInfo->{value};
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62 } else {
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63 return undef;
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64 }
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65 }
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66 }
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67
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68 sub Delete {
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69 my ($this,$key) = @_;
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70
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71 if (my $pair = $this->GetCache->{$key} ) {
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72 $pair->delete;
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73 delete $this->GetCache->{$key};
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74 return 1;
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75 }
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76 return 0;
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77 }
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78
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79 sub Has {
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80 my ($this,$key) = @_;
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81
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82 return exists $this->GetCache->{$key};
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83 }
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84
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85 1;
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86 __END__
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87 =pod
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88 =head1 SYNOPSIS
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89 package App::CDBI;
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90 use base 'Class::DBI';
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91
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92 #....
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93
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94 package App::MapString;
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95 use base 'Class::DBI','CDBI::Map';
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96
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97 #....
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98
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99
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100 my $Map = App::MapString->retrieve($id);
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101 print $Map->Item('key');
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102 $Map->Item('key','value');
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103 $Map->Delete('key');
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104 print "the $key is found" if $Map->Has($key);
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105
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106 =head1 DESCRIPTION
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107
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108 Provides a set of methods to manipulate with Maps;
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109
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110 =cut
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