branch-1-6/Bio/SeqIO/tinyseq/tinyseqHandler.pm

   1 # BioPerl module for Bio::SeqIO::tinyseqHandler
   2 #
   3 # Please direct questions and support issues to <bioperl-l@bioperl.org>
   4 #
   5 # Cared for by Donald Jackson, donald.jackson@bms.com
   6 #
   7 # Copyright Bristol-Myers Squibb
   8 #
   9 # You may distribute this module under the same terms as perl itself
  10
  11 # POD documentation - main docs before the code
  12
  13 =head1 NAME
  14
  15 Bio::SeqIO::tinyseq::tinyseqHandler - XML event handlers to support NCBI TinySeq XML parsing
  16
  17 =head1 SYNOPSIS
  18
  19 Do not use this module directly; use the SeqIO handler system:
  20
  21   $stream = Bio::SeqIO->new( -file => $filename, -format => 'tinyseq' );
  22
  23   while ( my $seq = $stream->next_seq ) {
  24     ....
  25   }
  26
  27 =head1 DESCRIPTION
  28
  29 This object provides event handler methods for parsing sequence files
  30 in the NCBI TinySeq XML format.  A TinySeq is a lightweight XML file
  31 of sequence information on one or more sequences, analgous to FASTA
  32 format.
  33
  34 See L<http://www.ncbi.nlm.nih.gov/dtd/NCBI_TSeq.mod.dtd> for the DTD.
  35
  36 =head1 FEEDBACK
  37
  38 =head2 Mailing Lists
  39
  40 User feedback is an integral part of the evolution of this and other
  41 Bioperl modules. Send your comments and suggestions preferably to
  42 the Bioperl mailing list.  Your participation is much appreciated.
  43
  44   bioperl-l@bioperl.org                  - General discussion
  45   http://bioperl.org/wiki/Mailing_lists  - About the mailing lists
  46
  47 =head2 Support
  48
  49 Please direct usage questions or support issues to the mailing list:
  50
  51 I<bioperl-l@bioperl.org>
  52
  53 rather than to the module maintainer directly. Many experienced and
  54 reponsive experts will be able look at the problem and quickly
  55 address it. Please include a thorough description of the problem
  56 with code and data examples if at all possible.
  57
  58 =head2 Reporting Bugs
  59
  60 Report bugs to the Bioperl bug tracking system to help us keep track
  61 of the bugs and their resolution. Bug reports can be submitted via
  62 the web:
  63
  64   http://bugzilla.open-bio.org/
  65
  66 =head1 SEE ALSO
  67
  68 L<Bio::SeqIO>, L<Bio::Seq>.
  69
  70 =head1 AUTHOR
  71
  72 Donald Jackson, E<lt>donald.jackson@bms.comE<gt>
  73
  74 =head1 APPENDIX
  75
  76 The rest of the documentation details each of the object methods.
  77 Internal methods are usually preceded with a _
  78
  79 =cut
  80
  81 package Bio::SeqIO::tinyseq::tinyseqHandler;
  82
  83 use strict;
  84 use warnings;
  85
  86
  87 use vars qw(%ATTMAP);
  88
  89 use base qw(Bio::Root::Root);
  90
  91 # %ATTMAP defines correspondence between TSeq elements, PrimarySeq attributes
  92 # Format: element_name => { xml_attname => pseq_attname }
  93 %ATTMAP = ( TSeq_sequence       => { Data       => '-seq'},
  94             TSeq_gi             => { Data       => '-primary_id' },
  95             TSeq_defline        => { Data       => '-desc' },
  96             TSeq_sid            => { Data       => '-sid' },
  97             TSeq_accver         => { Data       => '-accver' },
  98             TSeq_taxid          => { Data       => '-taxid' },
  99             TSeq_orgname        => { Data       => '-organism' }
 100            );
 101
 102 =head2 new
 103
 104   Title         : new
 105   Usage         : $handler = Bio::SeqIO::tinyseq::tinyseqHandler->new()
 106   Function      : instantiates a tinyseqHandler for use by
 107                   XML::Parser::PerlSAX
 108   Returns       : Bio::SeqIO::tinyseq::tinyseqHandler object
 109   Args          : NONE
 110
 111 =cut
 112
 113 sub new {
 114     my ($proto, @args) = @_;
 115     my $class = ref($proto) || $proto;
 116
 117     my $self =  bless({}, $class);
 118
 119     return $self;
 120 }
 121
 122 #######################################
 123 # Event hadling methods for PerlSax   #
 124 #######################################
 125
 126 sub doctype_decl {
 127     my ($self, $doctype) = @_;
 128     # make sure we have a tinyseq
 129     unless ($doctype->{'SystemId'} eq 'http://www.ncbi.nlm.nih.gov/dtd/NCBI_TSeq.dtd') {
 130         $self->throw("This document doesn't use the NCBI TinySeq dtd; it's a ", $doctype->{'SystemId'} );
 131     }
 132
 133 }
 134
 135 =head2 start_document
 136
 137   Title         : start_document
 138   Usage         : NONE
 139   Function      : start_document handler for use by XML::Parser::PerlSAX
 140   Returns       : NONE
 141   Args          : NONE
 142
 143 =cut
 144
 145 sub start_document {
 146     my ($self) = @_;
 147
 148     $self->{'_seqatts'} = [];
 149     $self->{'_elements'} = [];
 150 }
 151
 152 =head2 end_document
 153
 154   Title         : end_document
 155   Usage         : NONE
 156   Function      : end_document handler for use by XML::Parser::PerlSAX
 157   Returns       : NONE
 158   Args          : NONE
 159
 160 =cut
 161
 162 sub end_document {
 163     my ($self) = @_;
 164     return $self->{'_seqatts'};
 165 }
 166
 167 =head2 start_element
 168
 169   Title         : start_element
 170   Usage         : NONE
 171   Function      : start_element handler for use by XML::Parser::PerlSAX
 172   Returns       : NONE
 173   Args          : NONE
 174
 175 =cut
 176
 177 sub start_element {
 178     my ($self, $starting) = @_;
 179
 180     push(@{$self->{'_elements'}}, $starting);
 181 }
 182
 183 =head2 end_element
 184
 185   Title         : end_element
 186   Usage         : NONE
 187   Function      : end_element handler for use by XML::Parser::PerlSAX
 188   Returns       : NONE
 189   Args          : NONE
 190
 191 =cut
 192
 193 sub end_element {
 194     my ($self, $ending) = @_;
 195
 196     # do I have a handler for this element?
 197     my $ename = $ending->{'Name'};
 198     $self->$ename if ($self->can($ename));
 199 }
 200
 201 =head2 characters
 202
 203   Title         : characters
 204   Usage         : NONE
 205   Function      : characters handler for use by XML::Parser::PerlSAX
 206   Returns       : NONE
 207   Args          : NONE
 208
 209 =cut
 210
 211 sub characters {
 212     my ($self, $characters) = @_;
 213
 214     my $data = $characters->{'Data'};
 215
 216     return unless (defined($data) and $data =~ /\S/);
 217
 218     my $current = $self->_current_element;
 219     $current->{'Data'} = $data;
 220 }
 221
 222
 223 ###########################################
 224 # Element-specific handlers
 225 # called at END of element name
 226 ##########################################
 227
 228 =head2 TSeq
 229
 230   Title         : TSeq
 231   Usage         : NONE
 232   Function      : event handler for END of a TSeq element
 233   Returns       : loh of parsed sequence atts for Bio::SeqIO::tinyseq
 234   Args          : NONE
 235
 236 =cut
 237
 238 sub TSeq {
 239     my ($self) = @_;
 240
 241     my %seqatts;
 242
 243     # map elements onto PrimarySeq keys
 244     while (my $element = pop @{ $self->{'_elements'} }) {
 245         my $element_name = $element->{'Name'};
 246         last if ($element_name eq 'TSeq');
 247
 248         my $conversion = $ATTMAP{$element_name} or next;
 249
 250         while(my($element_att, $pseq_att) = each %$conversion) {
 251             $seqatts{$pseq_att} = $element->{$element_att};
 252         }
 253     }
 254
 255     push(@{ $self->{'_seqatts'} }, \%seqatts);
 256
 257 }
 258
 259 #############################################
 260 # Utility method to return current element info
 261 ##############################################
 262
 263 =head2 _current_element
 264
 265   Title         : _current_element
 266   Usage         : Internal method
 267   Function      : Utility method to return current element info
 268   Returns       : XML::Parser::PerlSAX hash for current element
 269   Args          : NONE
 270
 271 =cut
 272
 273 sub _current_element {
 274     my ($self) = @_;
 275     return $self->{'_elements'}->[-1];
 276 }
 277
 278
 279
 280
 281 1;