Koha/Objects.pm

   1 package Koha::Objects;
   2
   3 # Copyright ByWater Solutions 2014
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it under the
   8 # terms of the GNU General Public License as published by the Free Software
   9 # Foundation; either version 3 of the License, or (at your option) any later
  10 # version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License along
  17 # with Koha; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 use Modern::Perl;
  21
  22 use Carp;
  23
  24 use Koha::Database;
  25
  26 our $type;
  27
  28 =head1 NAME
  29
  30 Koha::Objects - Koha Object set base class
  31
  32 =head1 SYNOPSIS
  33
  34     use Koha::Objects;
  35     my @objects = Koha::Objects->search({ borrowernumber => $borrowernumber});
  36
  37 =head1 DESCRIPTION
  38
  39 This class must be subclassed.
  40
  41 =head1 API
  42
  43 =head2 Class Methods
  44
  45 =cut
  46
  47 =head3 Koha::Objects->new();
  48
  49 my $object = Koha::Objects->new();
  50
  51 =cut
  52
  53 sub new {
  54     my ($class) = @_;
  55     my $self = {};
  56
  57     bless( $self, $class );
  58 }
  59
  60 =head3 Koha::Objects->_new_from_dbic();
  61
  62 my $object = Koha::Objects->_new_from_dbic( $resultset );
  63
  64 =cut
  65
  66 sub _new_from_dbic {
  67     my ( $class, $resultset ) = @_;
  68     my $self = { _resultset => $resultset };
  69
  70     bless( $self, $class );
  71 }
  72
  73 =head3 Koha::Objects->find();
  74
  75 my $object = Koha::Objects->find($id);
  76 my $object = Koha::Objects->find( { keypart1 => $keypart1, keypart2 => $keypart2 } );
  77
  78 =cut
  79
  80 sub find {
  81     my ( $self, $id ) = @_;
  82
  83     return unless $id;
  84
  85     my $result = $self->_resultset()->find($id);
  86
  87     my $object = $self->object_class()->_new_from_dbic( $result );
  88
  89     return $object;
  90 }
  91
  92 =head3 Koha::Objects->search();
  93
  94 my @objects = Koha::Objects->search($params);
  95
  96 =cut
  97
  98 sub search {
  99     my ( $self, $params, $attributes ) = @_;
 100
 101     if (wantarray) {
 102         my @dbic_rows = $self->_resultset()->search($params, $attributes);
 103
 104         return $self->_wrap(@dbic_rows);
 105
 106     }
 107     else {
 108         my $class = ref($self) ? ref($self) : $self;
 109         my $rs = $self->_resultset()->search($params, $attributes);
 110
 111         return $class->_new_from_dbic($rs);
 112     }
 113 }
 114
 115 =head3 Koha::Objects->count();
 116
 117 my @objects = Koha::Objects->count($params);
 118
 119 =cut
 120
 121 sub count {
 122     my ( $self, $params ) = @_;
 123
 124     return $self->_resultset()->count($params);
 125 }
 126
 127 =head3 Koha::Objects->next();
 128
 129 my $object = Koha::Objects->next();
 130
 131 Returns the next object that is part of this set.
 132 Returns undef if there are no more objects to return.
 133
 134 =cut
 135
 136 sub next {
 137     my ( $self ) = @_;
 138
 139     my $result = $self->_resultset()->next();
 140     return unless $result;
 141
 142     my $object = $self->object_class()->_new_from_dbic( $result );
 143
 144     return $object;
 145 }
 146
 147 =head3 Koha::Objects->reset();
 148
 149 Koha::Objects->reset();
 150
 151 resets iteration so the next call to next() will start agein
 152 with the first object in a set.
 153
 154 =cut
 155
 156 sub reset {
 157     my ( $self ) = @_;
 158
 159     $self->_resultset()->reset();
 160
 161     return $self;
 162 }
 163
 164 =head3 Koha::Objects->as_list();
 165
 166 Koha::Objects->as_list();
 167
 168 Returns an arrayref of the objects in this set.
 169
 170 =cut
 171
 172 sub as_list {
 173     my ( $self ) = @_;
 174
 175     my @dbic_rows = $self->_resultset()->all();
 176
 177     my @objects = $self->_wrap(@dbic_rows);
 178
 179     return wantarray ? @objects : \@objects;
 180 }
 181
 182 =head3 Koha::Objects->_wrap
 183
 184 wraps the DBIC object in a corresponding Koha object
 185
 186 =cut
 187
 188 sub _wrap {
 189     my ( $self, @dbic_rows ) = @_;
 190
 191     my @objects = map { $self->object_class()->_new_from_dbic( $_ ) } @dbic_rows;
 192
 193     return @objects;
 194 }
 195
 196 =head3 Koha::Objects->_resultset
 197
 198 Returns the internal resultset or creates it if undefined
 199
 200 =cut
 201
 202 sub _resultset {
 203     my ($self) = @_;
 204
 205     if ( ref($self) ) {
 206         $self->{_resultset} ||=
 207           Koha::Database->new()->schema()->resultset( $self->type() );
 208
 209         return $self->{_resultset};
 210     }
 211     else {
 212         return Koha::Database->new()->schema()->resultset( $self->type() );
 213     }
 214 }
 215
 216 =head3 type
 217
 218 The type method must be set for all child classes.
 219 The value returned by it should be the DBIC resultset name.
 220 For example, for holds, type should return 'Reserve'.
 221
 222 =cut
 223
 224 sub type { }
 225
 226 =head3 object_class
 227
 228 This method must be set for all child classes.
 229 The value returned by it should be the name of the Koha
 230 object class that is returned by this class.
 231 For example, for holds, object_class should return 'Koha::Hold'.
 232
 233 =cut
 234
 235 sub object_class { }
 236
 237 sub DESTROY { }
 238
 239 =head1 AUTHOR
 240
 241 Kyle M Hall <kyle@bywatersolutions.com>
 242
 243 =cut
 244
 245 1;