Bio::Seq
BaseSeqProcessor
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Summary
Bio::Seq::BaseSeqProcessor - Base implementation for a SequenceProcessor
Package variables
No package variables defined.
Included modules
Inherit
Synopsis
# you need to derive your own processor from this one
Description
This provides just a basic framework for implementations of
Bio::Factory::SequenceProcessorI.
Essentially what it does is support a parameter to new() to set
sequence factory and source stream, and a next_seq() implementation
that will use a queue to be filled by a class overriding
process_seq().
Methods
Methods description
Title : close
Usage :
Function: Closes the stream. We override this here in order to cascade
to the source stream.
Example :
Returns :
Args : none |
Title : new
Usage : my $obj = new Bio::Seq::BaseSeqProcessor();
Function: Builds a new Bio::Seq::BaseSeqProcessor object
Returns : an instance of Bio::Seq::BaseSeqProcessor
Args : Named parameters. Currently supported are
-seqfactory the Bio::Factory::SequenceFactoryI object to use
-source_stream the Bio::Factory::SequenceStreamI object to
which we are chained |
Title : next_seq
Usage : $seq = stream->next_seq
Function: Reads the next sequence object from the stream and returns it.
This implementation will obtain objects from the source
stream as necessary and pass them to process_seq() for
processing. This method will return the objects one at a
time that process_seq() returns.
Returns : a Bio::Seq sequence object
Args : none
See Bio::Factory::SequenceStreamI::next_seq |
Title : object_factory
Usage : $obj->object_factory($newval)
Function: This is an alias to sequence_factory with a more generic name.
Example :
Returns : a Bio::Factory::ObjectFactoryI compliant object
Args : on set, new value (a Bio::Factory::ObjectFactoryI
compliant object or undef, optional) |
Title : process_seq
Usage :
Function: This is the method that is supposed to do the actual
processing. It needs to be overridden to do what you want
it to do.
Generally, you do not have to override or implement any other
method to derive your own sequence processor.
The implementation provided here just returns the unaltered
input sequence and hence is not very useful other than
serving as a neutral default processor.
Example :
Returns : An array of zero or more Bio::PrimarySeqI (or derived
interface) compliant object as the result of processing the
input sequence.
Args : A Bio::PrimarySeqI (or derived interface) compliant object
to be processed. |
Title : sequence_factory
Usage : $seqio->sequence_factory($seqfactory)
Function: Get the Bio::Factory::SequenceFactoryI
Returns : Bio::Factory::SequenceFactoryI
Args : none |
Title : source_stream
Usage : $obj->source_stream($newval)
Function: Get/set the source sequence stream for this sequence
processor.
Example :
Returns : A Bio::Factory::SequenceStreamI compliant object
Args : on set, new value (a Bio::Factory::SequenceStreamI compliant
object) |
Title : write_seq
Usage : $stream->write_seq($seq)
Function: writes the $seq object into the stream
This implementation passes the sequences to the source
stream unaltered. You need to override this in order to
have sequence objects altered before output.
Returns : 1 for success and 0 for error
Args : Bio::Seq object |
Methods code
sub close
{ my $self = shift;
return $self->source_stream() ? $self->source_stream->close(@_) : 1;} | sub new
{ my($class,@args) = @_;
my $self = $class->SUPER::new(@args);
my ($stream,$fact) =
$self->_rearrange([qw(SOURCE_STREAM SEQFACTORY)], @args);
$self->{'_queue'} = [];
$self->sequence_factory($fact) if $fact;
$self->source_stream($stream) if $stream;
return $self;} | sub next_seq
{ my $self = shift;
my $seq;
if(@{$self->{'_queue'}} == 0) {
my @seqs = ();
while($seq = $self->source_stream->next_seq()) {
@seqs = $self->process_seq($seq);
last if @seqs;
}
push(@{$self->{'_queue'}}, @seqs) if @seqs;
}
$seq = shift(@{$self->{'_queue'}});
return $seq;} | sub object_factory
{ return shift->sequence_factory(@_); } | sub process_seq
{ my ($self,$seq) = @_;
return ($seq);
}
1;} | sub sequence_factory
{ my $self = shift;
return $self->{'sequence_factory'} = shift if @_;
return $self->{'sequence_factory'};} | sub source_stream
{ my $self = shift;
if(@_) {
my $stream = shift;
my $fact = $stream->sequence_factory();
$self->sequence_factory($fact)
unless $self->sequence_factory() || (! $fact);
return $self->{'source_stream'} = $stream;
}
return $self->{'source_stream'};} | sub write_seq
{ return shift->source_stream->write_seq(@_); } | General documentation
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The rest of the documentation details each of the object methods.
Internal methods are usually preceded with a _
| To be overridden by a derived class | Top |