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package RDF::Helper::Object; |
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use strict; |
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409
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use warnings; |
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296
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4
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5408
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use Data::Dumper; |
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52029
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11
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658
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5
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3942
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use Data::UUID; |
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5403
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11
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585
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6
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3832
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use RDF::Helper::TiedPropertyHash; |
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22
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11
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281
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7
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use vars qw( $AUTOLOAD ); |
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576
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use overload |
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'""' => \&object_uri, |
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'eq' => \&object_uri_equals, |
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'==' => \&object_uri_equals; |
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# TODO: |
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# - Handle namespaces properly |
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=head1 NAME |
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RDF::Helper::Object - Perl extension to use RDF property names as methods |
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20
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=head1 SYNOPSIS |
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22
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use RDF::Helper; |
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my $rdf = RDF::Helper->new( |
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BaseInterface => 'RDF::Trine', |
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namespaces => { |
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dc => 'http://purl.org/dc/terms/', |
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rdf => "http://www.w3.org/1999/02/22-rdf-syntax-ns#", |
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'#default' => "http://xmlns.com/foaf/0.1/" |
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} |
30
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); |
31
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my $obj = $rdf->get_object('http://dahut.pm.org/dahut_group.rdf#bender'); |
32
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$obj->rdf_type('http://xmlns.com/foaf/0.1/Person'); |
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$obj->name("Bender"); |
34
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$obj->dc_description("A description of Bender"); |
35
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print $rdf->serialize(format => 'rdfxml') |
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37
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=head1 DESCRIPTION |
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39
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An object of this class is returned by the L<RDF::Helper> |
40
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C<get_object> method, which takes a B<subject> URI as the first |
41
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argument, and optionally a hash or hashref of options as the second |
42
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argument. |
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44
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On this object, you may then call methods that correspond to property |
45
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names of the properties you want to get or set. |
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47
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For properties in the default namespace, you may use them without any |
48
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regard to prefixes, whereas with properties in other namespaces, you |
49
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need to use the prefix and an underscore before the property name. |
50
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51
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This class does not make any attempt to verify whether the methods are |
52
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actually valid properties within the used schema, it just blindly does |
53
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what you tell it to. |
54
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55
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=cut |
56
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57
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sub new { |
58
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0
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0
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0
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my $proto = shift; |
59
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0
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my %args; |
60
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0
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0
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if ($#_ % 2) { |
61
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0
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%args = @_; |
62
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} else { |
63
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0
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my $ResourceURI = shift; |
64
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0
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%args = @_; |
65
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0
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$args{ResourceURI} = $ResourceURI; |
66
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} |
67
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0
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0
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my $class = ref( $proto ) || $proto; |
68
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69
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0
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my $self = {}; |
70
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0
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$self->{_datastore_} = $args{RDFHelper}; |
71
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0
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my $ug = new Data::UUID; |
72
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0
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my $uuid = $ug->create(); |
73
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74
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0
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0
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$self->{_uri_} = $args{ResourceURI} || "urn:" . $ug->to_string( $uuid ); |
75
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76
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0
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$self->{_rdftype_} = $args{RDFType}; |
77
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0
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0
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$self->{_defaultns_} = $args{DefaultNS} || $self->{_datastore_}->namespaces->{'#default'} || ''; |
78
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79
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0
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0
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0
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if ( defined( $args{NoTie} ) and $args{NoTie} == 1 ) { |
80
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$self->{_data_} = $self->{_datastore_}->property_hash( |
81
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$self->{_uri_} |
82
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0
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); |
83
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0
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$self->{_tied_} = 0; |
84
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} |
85
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else { |
86
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0
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0
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unless (defined( $args{TiedHashOptions} )) { |
87
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0
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$args{TiedHashOptions}->{Deep} = 1; |
88
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} |
89
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$self->{_data_} = $self->{_datastore_}->tied_property_hash( |
90
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$self->{_uri_}, |
91
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$args{TiedHashOptions} |
92
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0
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); |
93
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0
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$self->{_tied_} = 1; |
94
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} |
95
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96
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#warn "inired with data" . Dumper( $self->{_data_} ); |
97
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98
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0
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my $obj = bless $self, $class; |
99
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100
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# init for new objects |
101
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0
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$obj->object_init_internal; |
102
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103
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0
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return $obj; |
104
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} |
105
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106
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sub object_default_namespace { |
107
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0
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0
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0
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my $self = shift; |
108
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0
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0
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if ( @_ ) { |
109
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0
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$self->{_defaultns_} = shift; |
110
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} |
111
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0
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return $self->{_defaultns_}; |
112
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} |
113
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114
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sub object_init_internal { |
115
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0
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0
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0
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my $self = shift; |
116
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0
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0
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unless ( defined( $self->{_data_}->{'rdf:type'} ) ) { |
117
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0
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my $type = $self->object_rdfclasstype; |
118
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0
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0
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$self->{_data_}->{'rdf:type'} = $type if ($type); |
119
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} |
120
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} |
121
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122
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sub object_is_tied { |
123
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0
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0
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0
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my $self = shift; |
124
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0
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return $self->{_tied_}; |
125
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} |
126
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127
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sub object_uri { |
128
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0
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0
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0
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my $self = shift; |
129
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0
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return $self->{_uri_}; |
130
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} |
131
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132
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sub object_uri_equals { |
133
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0
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0
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0
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my $self = shift; |
134
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0
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my $value = shift; |
135
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0
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return $self->object_uri eq $value; |
136
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} |
137
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138
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sub object_datastore { |
139
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0
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0
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0
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my $self = shift; |
140
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0
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return $self->{_datastore_}; |
141
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} |
142
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143
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sub object_rdfclasstype { |
144
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0
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0
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0
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my $self = shift; |
145
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0
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0
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0
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if ( $#_ > -1 and $_[0] ) { |
146
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0
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$self->{_rdftype_} = shift; |
147
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} |
148
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0
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0
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if ($self->{_rdftype_}) { |
149
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0
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return $self->{_rdftype_}; |
150
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} else { |
151
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0
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return $self->{_data_}->{'rdf:type'}; |
152
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} |
153
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} |
154
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155
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sub object_data { |
156
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0
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0
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0
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my $self = shift; |
157
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0
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my $new = shift; |
158
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0
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0
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if ( $new ) { |
159
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# this is a little different since its a tied hash |
160
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0
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%{$self->{_data_}} = (); |
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0
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161
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0
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foreach my $key ( keys( %{$new} ) ) { |
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0
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162
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0
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$self->{_data_}->{$key} = $new->{$key}; |
163
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} |
164
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0
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$self->object_init_internal; |
165
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0
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return 1; |
166
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} |
167
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# don'[t cough up the tied data, give a copy |
168
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# and add the internal properties |
169
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0
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my $clone = {}; |
170
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0
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foreach my $k ( keys( %{$self->{_data_}} ) ) { |
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0
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171
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0
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$clone->{$k} = $self->{_data_}->{$k}; |
172
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} |
173
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0
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$clone->{object_uri} = $self->object_uri; |
174
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175
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#warn "returning clone" . Dumper( $clone ); |
176
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0
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return $clone; |
177
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} |
178
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179
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sub AUTOLOAD { |
180
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# don't DESTROY |
181
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0
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0
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0
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return if $AUTOLOAD =~ /::DESTROY/; |
182
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0
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0
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|
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die "Unknown method" if $AUTOLOAD =~ /::object_.*$/; |
183
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184
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0
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my $self = $_[0]; |
185
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186
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# fetch the attribute name |
187
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0
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$AUTOLOAD =~ /.*::([a-zA-Z0-9_]+)/; |
188
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0
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my $ns = $self->object_default_namespace; |
189
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0
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my $attr = $1; |
190
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0
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my $attr_uri = $ns . $attr; |
191
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0
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0
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|
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if ($attr =~ /^([^_]+)_(.+)$/) { |
192
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0
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my $nsprefix = $1; |
193
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0
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|
my $nsattr = $2; |
194
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0
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0
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if ($self->{_datastore_}->namespaces->{$nsprefix}) { |
195
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0
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$ns = $self->{_datastore_}->namespaces->{$nsprefix}; |
196
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0
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|
$attr = $nsprefix . ':' . $nsattr; |
197
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0
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|
$attr_uri = $ns . $nsattr; |
198
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} |
199
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} |
200
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201
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202
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0
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0
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|
|
if ( $attr ) { |
203
|
11
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|
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11
|
|
7568
|
no strict 'refs'; |
|
11
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|
|
|
|
15
|
|
|
11
|
|
|
|
|
2082
|
|
204
|
|
|
|
|
|
|
# create the method |
205
|
0
|
|
|
|
|
|
*{$AUTOLOAD} = sub { |
206
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|
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|
|
#warn "accessor called: $attr"; |
207
|
0
|
|
|
0
|
|
|
my $self = shift; |
208
|
0
|
0
|
|
|
|
|
if ( @_ ) { |
209
|
0
|
|
|
|
|
|
my $val = shift; |
210
|
0
|
0
|
|
|
|
|
unless( defined( $val ) ) { |
211
|
0
|
|
|
|
|
|
delete $self->{_data_}->{$attr}; |
212
|
0
|
|
|
|
|
|
return 1; |
213
|
|
|
|
|
|
|
} |
214
|
0
|
|
|
|
|
|
$self->{_data_}->{$attr} = $val; |
215
|
0
|
|
|
|
|
|
return 1; |
216
|
|
|
|
|
|
|
} |
217
|
0
|
0
|
|
|
|
|
if (defined $self->{_data_}->{$attr}) { |
218
|
0
|
|
|
|
|
|
my $result = $self->{_data_}->{$attr}; |
219
|
0
|
0
|
|
|
|
|
my @results = ref($result) eq 'ARRAY' ? @$result : $result; |
220
|
0
|
0
|
|
|
|
|
@results = map {ref($_) eq 'HASH' ? $self->{_datastore_}->get_object($_->{resource_uri}) : $_ } @results; |
|
0
|
|
|
|
|
|
|
221
|
0
|
0
|
|
|
|
|
if ($#results > 0) { |
222
|
0
|
0
|
|
|
|
|
return wantarray ? @results : \@results; |
223
|
|
|
|
|
|
|
} else { |
224
|
0
|
|
|
|
|
|
return $results[0]; |
225
|
|
|
|
|
|
|
} |
226
|
|
|
|
|
|
|
} |
227
|
0
|
|
|
|
|
|
return undef; |
228
|
0
|
|
|
|
|
|
}; |
229
|
|
|
|
|
|
|
# now do it |
230
|
0
|
|
|
|
|
|
goto &{$AUTOLOAD}; |
|
0
|
|
|
|
|
|
|
231
|
|
|
|
|
|
|
} |
232
|
|
|
|
|
|
|
} |
233
|
|
|
|
|
|
|
|
234
|
|
|
|
|
|
|
1; |