|  line  | 
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 code  | 
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 package Rose::DB::Object::Iterator;  | 
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2
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3
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61
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431
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 use strict;  | 
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61
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124
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61
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1811
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61
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306
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 use Carp();  | 
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61
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133
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61
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1126
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7
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61
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61
  
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742
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 use Rose::Object;  | 
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61
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289
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61
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5554
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8
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 our @ISA = qw(Rose::Object);  | 
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9
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    | 
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10
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 our $VERSION = '0.759';  | 
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11
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12
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 use Rose::Object::MakeMethods::Generic  | 
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13
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 (  | 
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14
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61
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   scalar =>   | 
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15
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   [  | 
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16
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     'error',  | 
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17
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     '_count',  | 
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18
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     '_next_code',  | 
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19
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     '_finish_code',  | 
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20
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     '_destroy_code',  | 
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21
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   ],  | 
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22
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23
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   'boolean' => 'active',  | 
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24
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61
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61
  
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1080
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 );  | 
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61
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8946
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26
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 sub next  | 
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27
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 {  | 
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28
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0
  
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0
  
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1
  
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   my($self) = shift;  | 
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29
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0
  
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   my $ret = $self->_next_code->($self, @_);  | 
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30
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0
  
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  0
  
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   $self->active(0)  unless($ret);  | 
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31
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0
  
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   return $ret;  | 
| 
32
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33
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34
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 sub finish  | 
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35
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 {  | 
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36
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0
  
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0
  
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1
  
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   my($self) = shift;  | 
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37
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0
  
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   $self->active(0);  | 
| 
38
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0
  
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0
  
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   $self->_next_code(sub { 0 });  | 
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0
  
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    | 
| 
39
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0
  
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   return $self->_finish_code->($self, @_);  | 
| 
40
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 }  | 
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41
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42
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 sub DESTROY  | 
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43
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 {  | 
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44
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0
  
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0
  
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   my($self) = shift;  | 
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45
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    | 
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46
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0
  
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  0
  
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   if($self->active)  | 
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  0
  
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| 
47
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   {  | 
| 
48
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0
  
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     $self->finish;  | 
| 
49
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   }  | 
| 
50
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   elsif(my $code = $self->_destroy_code)  | 
| 
51
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   {  | 
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52
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0
  
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     $code->($self);  | 
| 
53
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   }  | 
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54
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 }  | 
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55
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    | 
| 
56
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0
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0
  
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1
  
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 sub total { shift->{'_count'} }  | 
| 
57
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    | 
| 
58
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 1;  | 
| 
59
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    | 
| 
60
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 __END__  | 
| 
61
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    | 
| 
62
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 =head1 NAME  | 
| 
63
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    | 
| 
64
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 Rose::DB::Object::Iterator - Iterate over a series of Rose::DB::Objects.  | 
| 
65
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    | 
| 
66
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 =head1 SYNOPSIS  | 
| 
67
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    | 
| 
68
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     $iterator = Rose::DB::Object::Manager->get_objects_iterator(...);  | 
| 
69
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    | 
| 
70
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     while($object = $iterator->next)  | 
| 
71
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     {  | 
| 
72
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       # do stuff with $object...  | 
| 
73
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    | 
| 
74
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       if(...) # bail out early  | 
| 
75
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       {  | 
| 
76
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         $iterator->finish;  | 
| 
77
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         last;  | 
| 
78
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       }  | 
| 
79
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     }  | 
| 
80
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    | 
| 
81
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     if($iterator->error)  | 
| 
82
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     {  | 
| 
83
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       print "There was an error: ", $iterator->error;  | 
| 
84
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     }  | 
| 
85
 | 
 
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     else  | 
| 
86
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     {  | 
| 
87
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       print "Total: ", $iterator->total;  | 
| 
88
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     }  | 
| 
89
 | 
 
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    | 
| 
90
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 =head1 DESCRIPTION  | 
| 
91
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    | 
| 
92
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 | 
 
 | 
 
 | 
 
 | 
 
 | 
 L<Rose::DB::Object::Iterator> is an iterator object that traverses a database query, returning L<Rose::DB::Object>-derived objects for each row.  L<Rose::DB::Object::Iterator> objects are created by calls to the L<get_objects_iterator|Rose::DB::Object::Manager/get_objects_iterator> method of L<Rose::DB::Object::Manager> or one of its subclasses.  | 
| 
93
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    | 
| 
94
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 =head1 OBJECT METHODS  | 
| 
95
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    | 
| 
96
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 | 
 
 | 
 
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 | 
 
 | 
 
 | 
 =over 4  | 
| 
97
 | 
 
 | 
 
 | 
 
 | 
 
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    | 
| 
98
 | 
 
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 | 
 
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 =item B<error>  | 
| 
99
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    | 
| 
100
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 Returns the text message associated with the last error, or false if there was no error.  | 
| 
101
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    | 
| 
102
 | 
 
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 | 
 
 | 
 
 | 
 
 | 
 
 | 
 =item B<finish>  | 
| 
103
 | 
 
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    | 
| 
104
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 Prematurely stop the iteration (i.e., before iterating over all of the available objects).  | 
| 
105
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    | 
| 
106
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 =item B<next>  | 
| 
107
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    | 
| 
108
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 Return the next L<Rose::DB::Object>-derived object.  Returns false (but defined) if there are no more objects to iterate over, or undef if there was an error.  | 
| 
109
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    | 
| 
110
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 =item B<total>  | 
| 
111
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    | 
| 
112
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 Returns the total number of objects iterated over so far.  | 
| 
113
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    | 
| 
114
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 =back  | 
| 
115
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    | 
| 
116
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 | 
 =head1 AUTHOR  | 
| 
117
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    | 
| 
118
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 | 
 John C. Siracusa (siracusa@gmail.com)  | 
| 
119
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    | 
| 
120
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 | 
 
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 =head1 LICENSE  | 
| 
121
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    | 
| 
122
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 Copyright (c) 2010 by John C. Siracusa.  All rights reserved.  This program is  | 
| 
123
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 free software; you can redistribute it and/or modify it under the same terms  | 
| 
124
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 as Perl itself.  |