/ 
bioperl-1.4
/ Bio::Factory::SequenceProcessorI

NAME

Bio::Factory::SequenceProcessorI - Interface for chained sequence processing algorithms

SYNOPSIS

    use Bio::SeqIO;
    use MySeqProcessor; # is-a Bio::Factory::SequenceProcessorI

    # obtain your source stream, e.g., an EMBL file
    my $seqin = Bio::SeqIO->new(-fh => \*STDIN, -format => 'embl');
    # create your processor (it must implement this interface)
    my $seqalgo = MySeqProcessor->new();
    # chain together
    $seqalgo->source_stream($seqin);
    # you could create more processors and chain them one after another
    # ...
    # finally, the last link in the chain is your SeqIO stream
    my $seqpipe = $seqalgo;

    # once you've established the pipeline, proceed as if you had a
    # single SeqIO stream
    while(my $seq = $seqpipe->next_seq()) {
	# ... do something ...
    }

DESCRIPTION

This defines an interface that allows seamless chaining of sequence processing algorithms encapsulated in modules while retaining the overall Bio::SeqIO interface at the end of the pipeline.

This is especially useful if you want an easily configurable processing pipeline of re-usable algorithms as building blocks instead of (hard-)coding the whole algorithm in a single script.

There are literally no restrictions as to what an individual module can do with a sequence object it obtains from the source stream before it makes it available through its own next_seq() method. It can manipulate the sequence object, but otherwise keep it intact, but it can also create any number of new sequence objects from it, or it can discard some, or any combination thereof. The only requirement is that its next_seq() method return Bio::PrimarySeqI compliant objects. In order to play nice, if a processor creates new objects it should try to use the same sequence factory that the source stream uses, but this is not strongly mandated.

FEEDBACK

Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to the Bioperl mailing list. Your participation is much appreciated.

bioperl-l@bioperl.org              - General discussion
http://bioperl.org/MailList.shtml  - About the mailing lists

Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track of the bugs and their resolution. Bug reports can be submitted via email or the web:

bioperl-bugs@bioperl.org
http://bioperl.org/bioperl-bugs/

AUTHOR - Hilmar Lapp

Email hlapp at gmx.net

Describe contact details here

CONTRIBUTORS

Additional contributors names and emails here

APPENDIX

The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _

source_stream

Title   : source_stream
Usage   : $obj->source_stream($newval)
Function: Get/set the source sequence stream for this sequence
          processor.

          An implementation is not required to allow set, but will
          usually do so.

Example : 
Returns : A Bio::Factory::SequenceStreamI compliant object
Args    : on set, new value (a Bio::Factory::SequenceStreamI compliant
          object)

Bio::Factory::SequenceStreamI methods

The requirement to implement these methods is inherited from
L<Bio::Factory::SequenceStreamI>. An implementation may not
necessarily have to implement all methods in a meaningful way. Which
methods will be necessary very much depends on the context in which
an implementation of this interface is used. E.g., if it is only used
for post-processing sequences read from a SeqIO stream, write_seq()
will not be used and hence does not need to be implemented in a
meaningful way (it may in fact even throw an exception).

Also, since an implementor will already receive built objects from a
sequence stream, sequence_factory() may or may not be relevant,
depending on whether the processing method does or does not involve
creating new objects.

next_seq

Title   : next_seq
Usage   : $seq = stream->next_seq
Function: Reads the next sequence object from the stream and returns it.

          In the case of a non-recoverable situation an exception
          will be thrown.  Do not assume that you can resume parsing
          the same stream after catching the exception. Note that you
          can always turn recoverable errors into exceptions by
          calling $stream->verbose(2).

Returns : a Bio::Seq sequence object
Args    : none

See Bio::Root::RootI

write_seq

Title   : write_seq
Usage   : $stream->write_seq($seq)
Function: writes the $seq object into the stream
Returns : 1 for success and 0 for error
Args    : Bio::Seq object

sequence_factory

Title   : sequence_factory
Usage   : $seqio->sequence_factory($seqfactory)
Function: Get the Bio::Factory::SequenceFactoryI
Returns : Bio::Factory::SequenceFactoryI
Args    : none