|  line  | 
 stmt  | 
 bran  | 
 cond  | 
 sub  | 
 pod  | 
 time  | 
 code  | 
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1
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 # RDF::Trine::Iterator::Boolean  | 
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2
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 # -----------------------------------------------------------------------------  | 
| 
3
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    | 
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4
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 =head1 NAME  | 
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5
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    | 
| 
6
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 RDF::Trine::Iterator::Boolean - Iterator class for boolean query results  | 
| 
7
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    | 
| 
8
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 =head1 VERSION  | 
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9
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    | 
| 
10
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 This document describes RDF::Trine::Iterator::Boolean version 1.018  | 
| 
11
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    | 
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12
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 =head1 SYNOPSIS  | 
| 
13
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    | 
| 
14
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  use RDF::Trine::Iterator::Boolean;  | 
| 
15
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    | 
| 
16
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  my $iterator = RDF::Trine::Iterator::Boolean->new( [1] );  | 
| 
17
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  my $bool = $iterator->get_boolean;  | 
| 
18
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  if ($bool) {  | 
| 
19
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  	print "Yes.\n";  | 
| 
20
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  }  | 
| 
21
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    | 
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22
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 =head1 METHODS  | 
| 
23
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    | 
| 
24
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 Beyond the methods documented below, this class inherits methods from the  | 
| 
25
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 L<RDF::Trine::Iterator> class.  | 
| 
26
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    | 
| 
27
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 =over 4  | 
| 
28
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    | 
| 
29
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 =cut  | 
| 
30
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    | 
| 
31
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 package RDF::Trine::Iterator::Boolean;  | 
| 
32
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    | 
| 
33
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68
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68
  
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426
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 use strict;  | 
| 
 
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68
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153
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    | 
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68
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1749
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    | 
| 
34
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68
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68
  
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 | 
328
 | 
 use warnings;  | 
| 
 
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68
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 | 
140
 | 
    | 
| 
 
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68
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 | 
1666
 | 
    | 
| 
35
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68
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68
  
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 | 
328
 | 
 no warnings 'redefine';  | 
| 
 
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68
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137
 | 
    | 
| 
 
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68
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2025
 | 
    | 
| 
36
 | 
68
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68
  
 | 
 
 | 
339
 | 
 use JSON 2.0;  | 
| 
 
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68
 | 
 
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1110
 | 
    | 
| 
 
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68
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483
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    | 
| 
37
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    | 
| 
38
 | 
68
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68
  
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 | 
7398
 | 
 use base qw(RDF::Trine::Iterator);  | 
| 
 
 | 
68
 | 
 
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 | 
157
 | 
    | 
| 
 
 | 
68
 | 
 
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 | 
5931
 | 
    | 
| 
39
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 | 
 our ($VERSION);  | 
| 
40
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 | 
 BEGIN {  | 
| 
41
 | 
68
 | 
 
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68
  
 | 
 
 | 
20814
 | 
 	$VERSION	= '1.018';  | 
| 
42
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 | 
 }  | 
| 
43
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    | 
| 
44
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 =item C<new ( \@results, %args )>  | 
| 
45
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    | 
| 
46
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 =item C<new ( \&results, %args )>  | 
| 
47
 | 
 
 | 
 
 | 
 
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    | 
| 
48
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 | 
 Returns a new SPARQL Result interator object. Results must be either  | 
| 
49
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 | 
 an reference to an array containing results or a CODE reference that  | 
| 
50
 | 
 
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 | 
 acts as an iterator, returning successive items when called, and  | 
| 
51
 | 
 
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 returning undef when the iterator is exhausted.  | 
| 
52
 | 
 
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    | 
| 
53
 | 
 
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 | 
 $type should be one of: bindings, boolean, graph.  | 
| 
54
 | 
 
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    | 
| 
55
 | 
 
 | 
 
 | 
 
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 | 
 
 | 
 =cut  | 
| 
56
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 | 
    | 
| 
57
 | 
 
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 | 
 sub new {  | 
| 
58
 | 
7
 | 
 
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 | 
  
7
  
 | 
  
1
  
 | 
1778
 | 
 	my $class		= shift;  | 
| 
59
 | 
7
 | 
 
 | 
  
 50
  
 | 
  
0
  
 | 
 
 | 
25
 | 
 	my $stream		= shift || sub { undef };  | 
| 
 
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
    | 
| 
60
 | 
7
 | 
 
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 | 
 
 | 
19
 | 
 	my %args		= @_;  | 
| 
61
 | 
 
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 | 
 	  | 
| 
62
 | 
7
 | 
 
 | 
 
 | 
 
 | 
 
 | 
15
 | 
 	my $type		= 'boolean';  | 
| 
63
 | 
7
 | 
 
 | 
 
 | 
 
 | 
 
 | 
42
 | 
 	return $class->SUPER::new( $stream, $type, [], %args );  | 
| 
64
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
65
 | 
 
 | 
 
 | 
 
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 | 
 
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 | 
    | 
| 
66
 | 
 
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 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub _new {  | 
| 
67
 | 
  
0
  
 | 
 
 | 
 
 | 
  
0
  
 | 
 
 | 
0
 | 
 	my $class	= shift;  | 
| 
68
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	my $stream	= shift;  | 
| 
69
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	my $type	= shift;  | 
| 
70
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	my $names	= shift;  | 
| 
71
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	my %args	= @_;  | 
| 
72
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	return $class->new( $stream, %args );  | 
| 
73
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
74
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
75
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item C<is_boolean>  | 
| 
76
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
77
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 Returns true if the underlying result is a boolean value.  | 
| 
78
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
79
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =cut  | 
| 
80
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
81
 | 
 
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 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub is_boolean {  | 
| 
82
 | 
3
 | 
 
 | 
 
 | 
  
3
  
 | 
  
1
  
 | 
1627
 | 
 	my $self			= shift;  | 
| 
83
 | 
3
 | 
 
 | 
 
 | 
 
 | 
 
 | 
14
 | 
 	return 1;  | 
| 
84
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
85
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
86
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item C<as_string ( $max_size [, \$count] )>  | 
| 
87
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
88
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 Returns a string serialization of the stream data.  | 
| 
89
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
90
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =cut  | 
| 
91
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
92
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub as_string {  | 
| 
93
 | 
  
0
  
 | 
 
 | 
 
 | 
  
0
  
 | 
  
1
  
 | 
0
 | 
 	my $self	= shift;  | 
| 
94
 | 
  
0
  
 | 
  
  0
  
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	my $value	= $self->get_boolean ? 'true' : 'false';  | 
| 
95
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	return $value;  | 
| 
96
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
97
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
98
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item C<as_xml ( $max_size )>  | 
| 
99
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
100
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 Returns an XML serialization of the stream data.  | 
| 
101
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
102
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =cut  | 
| 
103
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
104
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub as_xml {  | 
| 
105
 | 
1
 | 
 
 | 
 
 | 
  
1
  
 | 
  
1
  
 | 
5
 | 
 	my $self	= shift;  | 
| 
106
 | 
1
 | 
  
 50
  
 | 
 
 | 
 
 | 
 
 | 
4
 | 
 	my $value	= $self->get_boolean ? 'true' : 'false';  | 
| 
107
 | 
1
 | 
 
 | 
 
 | 
 
 | 
 
 | 
4
 | 
 	my $xml	= <<"END";  | 
| 
108
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 <?xml version="1.0" encoding="utf-8"?>  | 
| 
109
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 <sparql xmlns="http://www.w3.org/2005/sparql-results#">  | 
| 
110
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 	<head></head>  | 
| 
111
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 	<boolean>${value}</boolean>  | 
| 
112
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 </sparql>  | 
| 
113
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 END  | 
| 
114
 | 
1
 | 
 
 | 
 
 | 
 
 | 
 
 | 
3
 | 
 	return $xml;  | 
| 
115
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
116
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
117
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item C<< print_xml ( $fh, $max_size ) >>  | 
| 
118
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
119
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 Prints an XML serialization of the stream data to the filehandle $fh.  | 
| 
120
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
121
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =cut  | 
| 
122
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
123
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub print_xml {  | 
| 
124
 | 
  
0
  
 | 
 
 | 
 
 | 
  
0
  
 | 
  
1
  
 | 
0
 | 
 	my $self	= shift;  | 
| 
125
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	my $fh		= shift;  | 
| 
126
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
 	print {$fh} $self->as_xml;  | 
| 
 
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
0
 | 
    | 
| 
127
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
128
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
129
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item C<as_json ( $max_size )>  | 
| 
130
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
131
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 Returns a JSON serialization of the stream data.  | 
| 
132
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
133
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =cut  | 
| 
134
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
135
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub as_json {  | 
| 
136
 | 
1
 | 
 
 | 
 
 | 
  
1
  
 | 
  
1
  
 | 
5
 | 
 	my $self			= shift;  | 
| 
137
 | 
1
 | 
 
 | 
  
 50
  
 | 
 
 | 
 
 | 
6
 | 
 	my $max_result_size	= shift || 0;  | 
| 
138
 | 
1
 | 
  
 50
  
 | 
 
 | 
 
 | 
 
 | 
4
 | 
 	my $value	= $self->get_boolean ? JSON::true : JSON::false;  | 
| 
139
 | 
1
 | 
 
 | 
 
 | 
 
 | 
 
 | 
6
 | 
 	my $data	= { head => { vars => [] }, boolean => $value };  | 
| 
140
 | 
1
 | 
 
 | 
 
 | 
 
 | 
 
 | 
5
 | 
 	return to_json( $data );  | 
| 
141
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 }  | 
| 
142
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
143
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item C<< construct_args >>  | 
| 
144
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
145
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 Returns the arguments necessary to pass to the stream constructor _new  | 
| 
146
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 to re-create this stream (assuming the same closure as the first  | 
| 
147
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
148
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =cut  | 
| 
149
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
150
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 sub construct_args {  | 
| 
151
 | 
  
0
  
 | 
 
 | 
 
 | 
  
0
  
 | 
  
1
  
 | 
 
 | 
 	my $self	= shift;  | 
| 
152
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 	my $type	= $self->type;  | 
| 
153
 | 
  
0
  
 | 
 
 | 
  
  0
  
 | 
 
 | 
 
 | 
 
 | 
 	my $args	= $self->_args || {};  | 
| 
154
 | 
  
0
  
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 	return ($type, [], %{ $args });  | 
| 
 
 | 
0
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
155
 | 
 
 | 
 
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 | 
 
 | 
 }  | 
| 
156
 | 
 
 | 
 
 | 
 
 | 
 
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 | 
 
 | 
    | 
| 
157
 | 
 
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 | 
 
 | 
    | 
| 
158
 | 
 
 | 
 
 | 
 
 | 
 
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 | 
 1;  | 
| 
159
 | 
 
 | 
 
 | 
 
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 | 
 
 | 
 
 | 
    | 
| 
160
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 __END__  | 
| 
161
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
162
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =back  | 
| 
163
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
164
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =head1 DEPENDENCIES  | 
| 
165
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
166
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 L<JSON|JSON>  | 
| 
167
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
    | 
| 
168
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 L<Scalar::Util|Scalar::Util>  | 
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 =head1 BUGS  | 
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 Please report any bugs or feature requests to through the GitHub web interface  | 
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 at L<https://github.com/kasei/perlrdf/issues>.  | 
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 Gregory Todd Williams  C<< <gwilliams@cpan.org> >>  | 
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 Copyright (c) 2006-2012 Gregory Todd Williams. This  | 
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 program is free software; you can redistribute it and/or modify it under  | 
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 the same terms as Perl itself.  | 
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 =cut  |