view variant_effect_predictor/Bio/Tools/Run/StandAloneBlast.pm @ 0:1f6dce3d34e0

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# $Id: StandAloneBlast.pm,v 1.23.2.3 2003/03/29 20:18:51 jason Exp $
#
# BioPerl module for Bio::Tools::StandAloneBlast
#
# Cared for by Peter Schattner
#
# Copyright Peter Schattner
#
# You may distribute this module under the same terms as perl itself

# POD documentation - main docs before the code

=head1 NAME

Bio::Tools::Run::StandAloneBlast - Object for the local execution of the
NCBI Blast program suite (blastall, blastpgp, bl2seq)

=head1 SYNOPSIS

Local-blast "factory object" creation and blast-parameter initialization:

 @params = ('database' => 'swissprot','outfile' => 'blast1.out', 
	    '_READMETHOD' => 'Blast');

 $factory = Bio::Tools::Run::StandAloneBlast->new(@params);

Blast a sequence against a database:

 $str = Bio::SeqIO->new(-file=>'t/amino.fa' , '-format' => 'Fasta' );
 $input = $str->next_seq();
 $input2 = $str->next_seq();
 $blast_report = $factory->blastall($input);

Run an iterated Blast (psiblast) of a sequence against a database:

 $factory->j(3);    # 'j' is blast parameter for # of iterations
 $factory->outfile('psiblast1.out');
 $factory = Bio::Tools::Run::StandAloneBlast->new(@params);
 $blast_report = $factory->blastpgp($input);

Use blast to align 2 sequences against each other:

 $factory = Bio::Tools::Run::StandAloneBlast->new('outfile' => 'bl2seq.out');
 $factory->bl2seq($input, $input2);

Various additional options and input formats are available.  See the
DESCRIPTION section for details.

=head1 DESCRIPTION

This DESCRIPTION only documents Bio::Tools::Run::StandAloneBlast: - a
Bioperl object for running the NCBI standAlone BLAST package.  Blast,
itself, is a large & complex program - for more information regarding
BLAST, please see the BLAST documentation which accompanies the BLAST
distribution. BLAST is available from ftp://ncbi.nlm.nih.gov/blast/.

(A source of confusion in documenting a BLAST interface is that the
term "program" is used in - at least - three different ways in the
BLAST documentation.  In this DESCRIPTION, "program" will refer to the
BLAST routine set by BLAST's C<-p> parameter that can be set to blastn,
blastp, tblastx etc.  We will use the term Blast "executable" to refer
to the various different executable files that may be called - ie
blastall, blastpgp or bl2seq.  In addition, there are several BLAST
capabilities (which are also referred to as "programs") and are
implemented by using specific combinations of BLAST executables,
programs and parameters.  They will be referred by their specific
names - eg PSIBLAST and PHIBLAST. )

StandAloneBlast has been tested so far only under Linux. I expect
that it should also work under other Unix systems. However, since the
module is implemented using (unix) system calls, modification may be
necessary before StandAloneBlast would work under non-Unix
operating systems (eg Windows, MacOS).  Before running
StandAloneBlast it is necessary: to install BLAST on your system,
to edit set the environmental variable $BLASTDIR or your $PATH
variable to point to the BLAST directory, and to ensure that users
have execute privileges for the BLAST program.  If the databases
which will be searched by BLAST are located in the data subdirectory
of the blast program directory (the default installation location),
StandAloneBlast will find them; however, if the database files are
located in any other location, environmental variable $BLASTDATADIR
will need to be set to point to that directory.

The use of the StandAloneBlast module is as follows: Initially, a
local blast "factory object" is created. The constructor may be passed
an optional array of (non-default) parameters to be used by the
factory, eg:

 @params = ('program' => 'blastn', 'database' => 'ecoli.nt');
 $factory = Bio::Tools::Run::StandAloneBlast->new(@params);

Any parameters not explicitly set will remain as the defaults of the
BLAST executable.  Note each BLAST executable has somewhat different
parameters and options.  See the BLAST Documentation for a description
or run the BLAST executable from the command line followed solely with
a "-" to see a list of options and default values for that executable;
eg E<gt>blastall -.

BLAST parameters can be changed and/or examined at any time after the
factory has been created.  The program checks that any
parameter/switch being set/read is valid.  Except where specifically
noted, StandAloneBlast uses the same single-letter, case-sensitive
parameter names as the actual blast program.  Currently no checks are
included to verify that parameters are of the proper type (eg string
or numeric) or that their values are within the proper range.

As an example, to change the value of the Blast parameter 'e' ('e' is
the parameter for expectation-value cutoff) 

 $expectvalue = 0.01;
 $factory->e($expectvalue);

Note that for improved script readibility one can modify the name of
the BLAST parameters as desired as long as the initial letter (and
case) of the parameter are preserved, eg
$factory-E<gt>expectvalue($expectvalue); Unfortunately, some of the BLAST
parameters are not the single letter one might expect (eg "iteration
round" in blastpgp is 'j'). Again one can check by using (eg)

 > blastpgp - .

Once the factory has been created and the appropriate parameters set,
 one can call one of the supported blast executables.  The input
 sequence(s) to these executables may be fasta file(s) as described in
 the BLAST documentation.

 $inputfilename = 't/testquery.fa';
 $blast_report = $factory->blastall($inputfilename);

In addition, sequence input may be in the form of either a Bio::Seq
 object or or an array of Bio::Seq objects, eg

 $input = Bio::Seq->new(-id=>"test query",-seq=>"ACTACCCTTTAAATCAGTGGGGG");
 $blast_report = $factory->blastall($input);

For blastall and non-psiblast blastpgp runs, report object is either a
BPlite.pm or Bio::SearchIO object, selected by the user with the
parameter _READMETHOD.  (The leading underscore is needed to
distinguish this option from options which are passed to the BLAST
executable.) The default parser is Bio::SearchIO::blast.  For
(multiple iteration) psiblast and bl2seq runs the report is
automatically parsed by the BPpsilite.pm and BPbl2seq.pm parsers
respectively, since neither Blast.pm nor BPlite can parse these
reports. In any case, the "raw" blast report is also available. The
filename is set by the in the 'outfile' parameter and has the default
value of "blastreport.out".

For psiblast execution in BLAST's "jumpstart" mode, the program must
be passed (in addition to the query sequence itself) an alignment
containing the query sequence (in the form of a SimpleAlign object) as
well as a "mask" specifying at what residues position-specific scoring
matrices (PSSMs) are to used and at what residues default scoring
matrices (eg BLOSUM) are to be used. See psiblast documentation for
more details.  The mask itself is a string of 0's and 1's which is the
same length as each sequence in the alignment and has a "1" at
locations where (PSSMs) are to be used and a "0" at all other
locations. So for example:

 $str = Bio::AlignIO->new(-file=> "cysprot.msf", '-format' => 'msf'  );
 $aln = $str->next_aln();
 $len = $aln->length_aln();
 $mask =   '1' x $len;  # simple case where PSSM's to be used at all residues
 $report = $factory->blastpgp("cysprot1.fa", $aln, $mask);

For bl2seq execution, StandAloneBlast.pm can be combined with
AlignIO.pm to directly produce a SimpleAlign object from the alignment
of the two sequences produced by bl2seq as in:

 #Get 2 sequences
 $str = Bio::SeqIO->new(-file=>'t/amino.fa' , '-format' => 'Fasta', );
 my $seq3 = $str->next_seq();
 my $seq4 = $str->next_seq();

 # Run bl2seq on them
 $factory = Bio::Tools::Run::StandAloneBlast->new('outfile' => 'bl2seq.out');
 my $bl2seq_report = $factory->bl2seq($seq3, $seq4);

 # Use AlignIO.pm to create a SimpleAlign object from the bl2seq report
 $str = Bio::AlignIO->new(-file=> 'bl2seq.out','-format' => 'bl2seq');
 $aln = $str->next_aln();

For more examples of syntax and use of Blast.pm, the user is
encouraged to run the scripts standaloneblast.pl in the bioperl
/examples directory and StandAloneBlast.t in the bioperl /t directory.

Note: There is a similar (but older) perl object interface offered by
nhgri. The nhgri module only supports blastall and does not support
blastpgp, psiblast, phiblast, bl2seq etc.  This module can be found at
http://genome.nhgri.nih.gov/blastall/.

=head1 DEVELOPERS NOTES

B<STILL TO BE WRITTEN>

Note: This module is still under development.  If you would like that a
specific BLAST feature be added to this perl interface, let me know.

=head1 FEEDBACK

=head2 Mailing Lists

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

  [e-mail]               - General discussion
  http://bio.perl.org/MailList.html   - About the mailing lists

=head2 Reporting Bugs

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

  [e-mail]
  http://bio.perl.org/bioperl-bugs/

=head1 AUTHOR -  Peter Schattner

Email [e-mail]

=head1 APPENDIX

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

=cut

package Bio::Tools::Run::StandAloneBlast;

use vars qw($AUTOLOAD @ISA $PROGRAMDIR  $DATADIR 
	    @BLASTALL_PARAMS @BLASTPGP_PARAMS 
	    @BL2SEQ_PARAMS @OTHER_PARAMS %OK_FIELD
	    );
use strict;
use Bio::Root::Root;
use Bio::Root::IO;
use Bio::Seq;
use Bio::SeqIO;
use Bio::Tools::BPbl2seq;
use Bio::Tools::BPpsilite;
use Bio::SearchIO;
use Bio::Tools::Run::WrapperBase;
use Bio::Factory::ApplicationFactoryI;

BEGIN {      

     @BLASTALL_PARAMS = qw( p d i e m o F G E X I q r v b f g Q
			    D a O J M W z K L Y S T l U y Z);
     @BLASTPGP_PARAMS = qw(d i A f e m o y P F G E X N g S H a I h c
			   j J Z O M v b C R W z K L Y p k T Q B l U);
     @BL2SEQ_PARAMS = qw(i j p g o d a G E X W M q r F e S T m);


# Non BLAST parameters start with underscore to differentiate them
# from BLAST parameters
     @OTHER_PARAMS = qw(_READMETHOD);

# _READMETHOD = 'BPlite' (default) or 'Blast'
# my @other_switches = qw(QUIET);


# Authorize attribute fields
     foreach my $attr (@BLASTALL_PARAMS,  @BLASTPGP_PARAMS, 
		       @BL2SEQ_PARAMS, @OTHER_PARAMS )
     { $OK_FIELD{$attr}++; }

# You will need to enable Blast to find the Blast program. This can be done
# in (at least) two different ways:
#  1. define an environmental variable blastDIR:
#	export BLASTDIR=/home/peter/blast   or
#  2. include a definition of an environmental variable BLASTDIR in every script that will
#     use StandAloneBlast.pm.
#	BEGIN {$ENV{BLASTDIR} = '/home/peter/blast/'; }
     $PROGRAMDIR = $ENV{'BLASTDIR'} || '';
     
# If local BLAST databases are not stored in the standard
# /data directory, the variable BLASTDATADIR will need to be set explicitly 
     $DATADIR =  $ENV{'BLASTDATADIR'} || $ENV{'BLASTDB'} || '';
}

@ISA = qw(Bio::Root::Root 
	  Bio::Tools::Run::WrapperBase 
	  Bio::Factory::ApplicationFactoryI);

=head1 BLAST parameters

Essentially all BLAST parameter can be set via StandAloneBlast.pm.
Some of the most commonly used parameters are listed below.  All
parameters have defaults and are optional (I think.)  For a complete
listing of settable parameters, run the relevant executable BLAST
program with the option "-" as in blastall -

=head2 Blastall

  -p  Program Name [String]
        Input should be one of "blastp", "blastn", "blastx", 
        "tblastn", or "tblastx".
  -d  Database [String] default = nr
        The database specified must first be formatted with formatdb.
        Multiple database names (bracketed by quotations) will be accepted.
        An example would be -d "nr est"
  -i  Query File [File In]   Set by StandAloneBlast.pm from script.
    default = stdin. The query should be in FASTA format.  If multiple FASTA entries are in the input
        file, all queries will be searched.
  -e  Expectation value (E) [Real] default = 10.0
  -o  BLAST report Output File [File Out]  Optional,
	default = ./blastreport.out ; set by StandAloneBlast.pm		
  -S  Query strands to search against database (for blast[nx], and tblastx).  3 is both, 1 is top, 2 is bottom [Integer]
	default = 3

=head2 Blastpgp (including Psiblast)

  -j   is the maximum number of rounds (default 1; i.e., regular BLAST)
  -h   is the e-value threshold for including sequences in the
	score matrix model (default 0.001)
  -c   is the "constant" used in the pseudocount formula specified in the paper (default 10)
  -B  Multiple alignment file for PSI-BLAST "jump start mode"  Optional
  -Q  Output File for PSI-BLAST Matrix in ASCII [File Out]  Optional

=head2 Bl2seq

  -i  First sequence [File In]
  -j  Second sequence [File In]
  -p  Program name: blastp, blastn, blastx. For blastx 1st argument should be nucleotide [String]
    default = blastp
  -o  alignment output file [File Out] default = stdout
  -e  Expectation value (E) [Real]  default = 10.0
  -S  Query strands to search against database (blastn only).  3 is both, 1 is top, 2 is bottom [Integer]
    default = 3

=cut

sub new {
    my ($caller, @args) = @_;
    # chained new
    my $self = $caller->SUPER::new(@args);
 
    # to facilitiate tempfile cleanup
    my ($tfh,$tempfile) = $self->io->tempfile();
    close($tfh); # we don't want the filehandle, just a temporary name
    $self->outfile($tempfile);
    $self->_READMETHOD('Blast');
    while (@args)  {
	my $attr =   shift @args;
	my $value =  shift @args;
	next if( $attr eq '-verbose');
	# the workaround to deal with initializing
	$attr = 'p' if $attr =~ /^\s*program\s*$/;
	$self->$attr($value);
    }
    return $self;
}

sub AUTOLOAD {
    my $self = shift;
    my $attr = $AUTOLOAD;
    $attr =~ s/.*:://;    
    my $attr_letter = substr($attr, 0, 1) ; 

    # actual key is first letter of $attr unless first attribute
    # letter is underscore (as in _READMETHOD), the $attr is a BLAST
    # parameter and should be truncated to its first letter only
    $attr = ($attr_letter eq '_') ? $attr : $attr_letter;
    $self->throw("Unallowed parameter: $attr !") unless $OK_FIELD{$attr};
#    $self->throw("Unallowed parameter: $attr !") unless $ok_field{$attr_letter};
    $self->{$attr_letter} = shift if @_;
    return $self->{$attr_letter};
}

=head1 Methods

=head2 executable

 Title   : executable
 Usage   : my $exe = $blastfactory->executable('blastall');
 Function: Finds the full path to the 'codeml' executable
 Returns : string representing the full path to the exe
 Args    : [optional] name of executable to set path to 
           [optional] boolean flag whether or not warn when exe is not found


=cut

sub executable {
   my ($self, $exename, $exe,$warn) = @_;
   $exename = 'blastall' unless defined $exename;

   if( defined $exe && -x $exe ) {
     $self->{'_pathtoexe'}->{$exename} = $exe;
   }
   unless( defined $self->{'_pathtoexe'}->{$exename} ) {
       my $f = $self->program_path($exename);	    
       $exe = $self->{'_pathtoexe'}->{$exename} = $f if(-e $f && -x $f );
        
       #  This is how I meant to split up these conditionals --jason
       # if exe is null we will execute this (handle the case where
       # PROGRAMDIR pointed to something invalid)
       unless( $exe )  {  # we didn't find it in that last conditional
	   if( ($exe = $self->io->exists_exe($exename)) && -x $exe ) {
	       $self->{'_pathtoexe'}->{$exename} = $exe;
	   } else { 
	       $self->warn("Cannot find executable for $exename") if $warn;
	       $self->{'_pathtoexe'}->{$exename} = undef;
	   }
       }
   }
   return $self->{'_pathtoexe'}->{$exename};
}


=head2 program_path

 Title   : program_path
 Usage   : my $path = $factory->program_path();
 Function: Builds path for executable 
 Returns : string representing the full path to the exe
 Args    : none

=cut

sub program_path {
    my ($self,$program_name) = @_;
    my @path;
    push @path, $self->program_dir if $self->program_dir;
    push @path, $program_name .($^O =~ /mswin/i ?'.exe':'');

    return Bio::Root::IO->catfile(@path);
}

=head2 program_dir

 Title   : program_dir
 Usage   : my $dir = $factory->program_dir();
 Function: Abstract get method for dir of program. To be implemented
           by wrapper.
 Returns : string representing program directory 
 Args    : none 

=cut

sub program_dir {
    $PROGRAMDIR;
}

sub program {
    my $self = shift;
    if( wantarray ) {
	return ($self->executable, $self->p());
    } else {
	return $self->executable(@_);
    }
}

=head2  blastall

 Title   : blastall
 Usage   :  $blast_report = $factory->blastall('t/testquery.fa');
	or
	       $input = Bio::Seq->new(-id=>"test query",
				      -seq=>"ACTACCCTTTAAATCAGTGGGGG");
	       $blast_report = $factory->blastall($input);
	or 
	      $seq_array_ref = \@seq_array;  # where @seq_array is an array of Bio::Seq objects
	      $blast_report = $factory->blastall(\@seq_array);
 Returns :  Reference to a Blast object or BPlite object 
           containing the blast report.
 Args    : Name of a file or Bio::Seq object or an array of 
           Bio::Seq object containing the query sequence(s). 
           Throws an exception if argument is not either a string 
           (eg a filename) or a reference to a Bio::Seq object 
           (or to an array of Seq objects).  If argument is string, 
           throws exception if file corresponding to string name can 
           not be found.

=cut

sub blastall {
    my ($self,$input1) = @_;
    $self->io->_io_cleanup();
    my $executable = 'blastall';
    my $input2;
# Create input file pointer
    my $infilename1 = $self->_setinput($executable, $input1);
    if (! $infilename1) {$self->throw(" $input1 ($infilename1) not Bio::Seq object or array of Bio::Seq objects or file name!");}

    $self->i($infilename1);	# set file name of sequence to be blasted to inputfilename1 (-i param of blastall)
    
    my $blast_report = &_generic_local_blast($self, $executable, 
					     $input1, $input2);
}

=head2  blastpgp

 Title   : blastpgp
 Usage   :  $blast_report = $factory-> blastpgp('t/testquery.fa');
	or
	       $input = Bio::Seq->new(-id=>"test query",
				      -seq=>"ACTADDEEQQPPTCADEEQQQVVGG");
	       $blast_report = $factory->blastpgp ($input);
	or 
	      $seq_array_ref = \@seq_array;  # where @seq_array is an array of Bio::Seq objects
	      $blast_report = $factory-> blastpgp(\@seq_array);
 Returns : Reference to a Blast object or BPlite object containing 
           the blast report.
 Args    : Name of a file or Bio::Seq object. In psiblast jumpstart 
           mode two additional arguments are required: a SimpleAlign 
           object one of whose elements is the query and a "mask" to 
           determine how BLAST should select scoring matrices see 
           DESCRIPTION above for more details.

           Throws an exception if argument is not either a string 
           (eg a filename) or a reference to a Bio::Seq object 
           (or to an array of Seq objects).  If argument is string, 
           throws exception if file corresponding to string name can 
           not be found.
 Returns : Reference to either a BPlite.pm, Blast.pm or BPpsilite.pm  
           object containing the blast report.

=cut

sub blastpgp {
    my $self = shift;
    my $executable = 'blastpgp';
    my $input1 = shift;
    my $input2 = shift;
    my $mask = shift;		# used by blastpgp's -B option to specify which residues are position aligned

    my  ($infilename1, $infilename2 )  = $self->_setinput($executable, 
							  $input1, $input2, 
							  $mask);
    if (!$infilename1) {$self->throw(" $input1  not Bio::Seq object or array of Bio::Seq objects or file name!");}
    $self->i($infilename1);	# set file name of sequence to be blasted to inputfilename1 (-i param of blastpgp)
    if  ($input2) {
	unless ($infilename2) {$self->throw("$input2 not SimpleAlign Object in pre-aligned psiblast\n");}
	$self->B($infilename2);	# set file name of partial alignment to inputfilename2 (-B param of blastpgp)
    }
    my $blast_report = &_generic_local_blast($self, $executable, $input1, $input2);
}

=head2   bl2seq

 Title   : bl2seq
 Usage   : $factory-> blastpgp('t/seq1.fa', 't/seq2.fa');
	or
	  $input1 = Bio::Seq->new(-id=>"test query1",
				  -seq=>"ACTADDEEQQPPTCADEEQQQVVGG");
	  $input2 = Bio::Seq->new(-id=>"test query2",
				  -seq=>"ACTADDEMMMMMMMDEEQQQVVGG");
	  $blast_report = $factory->bl2seq ($input1,  $input2);
 Returns : Reference to a BPbl2seq object containing the blast report.
 Args    : Names of 2 files  or 2 Bio::Seq objects containing the 
           sequences to be aligned by bl2seq.

           Throws an exception if argument is not either a pair of 
           strings (eg filenames) or  references to Bio::Seq objects.  
           If arguments are strings, throws exception if files 
           corresponding to string names can not be found.

=cut

sub bl2seq {
    my $self = shift;
    my $executable = 'bl2seq';
    my $input1 = shift;
    my $input2 = shift;

# Create input file pointer
    my  ($infilename1, $infilename2 )  = $self->_setinput($executable, 
							  $input1, $input2);
    if (!$infilename1){$self->throw(" $input1  not Seq Object or file name!");}
    if (!$infilename2){$self->throw("$input2  not Seq Object or file name!");}

    $self->i($infilename1);	# set file name of first sequence to 
                                # be aligned to inputfilename1 
                                # (-i param of bl2seq)
    $self->j($infilename2);	# set file name of first sequence to 
                                # be aligned to inputfilename2 
                                # (-j param of bl2seq)

    my $blast_report = &_generic_local_blast($self, $executable);    
}
#################################################

=head2  _generic_local_blast

 Title   : _generic_local_blast
 Usage   :  internal function not called directly
 Returns :  Blast or BPlite object
 Args    :   Reference to calling object and name of BLAST executable 

=cut

sub _generic_local_blast {
    my $self = shift;
    my $executable = shift;

    # Create parameter string to pass to Blast program
    my $param_string = $self->_setparams($executable);

    # run Blast
    my $blast_report = &_runblast($self, $executable, $param_string);
}


=head2  _runblast

 Title   :  _runblast
 Usage   :  Internal function, not to be called directly	
 Function:   makes actual system call to Blast program
 Example :
 Returns : Report object in the appropriate format (BPlite, 
           BPpsilite, Blast, or BPbl2seq)
 Args    : Reference to calling object, name of BLAST executable, 
           and parameter string for executable 

=cut

sub _runblast {
    my ($self,$executable,$param_string) = @_;
    my ($blast_obj,$exe);
    if( ! ($exe = $self->executable($executable)) ) {
	$self->warn("cannot find path to $executable");
	return undef;    
    }
    my $commandstring = $exe. $param_string;
   
    # next line for debugging
    $self->debug( "$commandstring \n");

    my $status = system($commandstring);

    $self->throw("$executable call crashed: $? $commandstring\n")  unless ($status==0) ;
    my $outfile = $self->o() ;	# get outputfilename
    my $signif = $self->e()  || 1e-5  ; 

# set significance cutoff to set expectation value or default value
# (may want to make this value vary for different executables)

# If running bl2seq or psiblast (blastpgp with multiple iterations),
# the specific parsers for these programs must be used (ie BPbl2seq or
# BPpsilite).  Otherwise either the Blast parser or the BPlite
# parsers can be selected.

    if ($executable =~ /bl2seq/i)  {
        if( $self->verbose > 0 ) {
	 open(OUT, $outfile) || $self->throw("cannot open $outfile");
	 while(<OUT>) { $self->debug($_)}
	 close(OUT);
        }
# Added program info so BPbl2seq can compute strand info
	$blast_obj = Bio::Tools::BPbl2seq->new(-file => $outfile,
                                               -REPORT_TYPE => $self->p );
#	$blast_obj = Bio::Tools::BPbl2seq->new(-file => $outfile);
    }
    elsif ($executable =~ /blastpgp/i && defined $self->j() && 
	   $self->j() > 1)  {
	print "using psilite parser\n";
	$blast_obj = Bio::Tools::BPpsilite->new(-file => $outfile);
    }
    elsif ($self->_READMETHOD =~ /^Blast/i )  {
	$blast_obj = Bio::SearchIO->new(-file=>$outfile,
					-format => 'blast'   )  ;
    }
    elsif ($self->_READMETHOD =~ /^BPlite/i )  {
	$blast_obj = Bio::Tools::BPlite->new(-file=>$outfile);
    } else {
	$self->warn("Unrecognized readmethod ".$self->_READMETHOD. " or executable $executable\n");
    }
    return $blast_obj;
}

=head2  _setinput

 Title   :  _setinput
 Usage   :  Internal function, not to be called directly	
 Function:   Create input file(s) for Blast executable
 Example :
 Returns : name of file containing Blast data input
 Args    : Seq object reference or input file name

=cut

sub _setinput {
    my ($self, $executable, $input1, $input2) = @_;
    my ($seq, $temp, $infilename1, $infilename2,$fh ) ;
#  If $input1 is not a reference it better be the name of a file with
#  the sequence/ alignment data...
    $self->io->_io_cleanup();

  SWITCH:  {
      unless (ref $input1) {
	  $infilename1 = (-e $input1) ? $input1 : 0 ;
	  last SWITCH; 
      }
#  $input may be an array of BioSeq objects...
      if (ref($input1) =~ /ARRAY/i ) {
	  ($fh,$infilename1) = $self->io->tempfile();
	  $temp =  Bio::SeqIO->new(-fh=> $fh, '-format' => 'Fasta');
	  foreach $seq (@$input1) {
	      unless ($seq->isa("Bio::PrimarySeqI")) {return 0;}
	      $temp->write_seq($seq);
	  }
	  close $fh;
	  $fh = undef;
	  last SWITCH;
      }
#  $input may be a single BioSeq object...
      elsif ($input1->isa("Bio::PrimarySeqI")) {
	  ($fh,$infilename1) = $self->io->tempfile();

# just in case $input1 is taken from an alignment and has spaces (ie
# deletions) indicated within it, we have to remove them - otherwise
# the BLAST programs will be unhappy

	  my $seq_string =  $input1->seq();
	  $seq_string =~ s/\W+//g; # get rid of spaces in sequence
	  $input1->seq($seq_string);
	  $temp =  Bio::SeqIO->new(-fh=> $fh, '-format' => 'Fasta');
	  $temp->write_seq($input1);
	  close $fh;
	  undef $fh;
#		$temp->write_seq($input1);
	  last SWITCH;
      }
      $infilename1 = 0;		# Set error flag if you get here
  }				# End SWITCH
    unless ($input2) { return $infilename1; }
  SWITCH2:  {
      unless (ref $input2) {
	  $infilename2 =   (-e $input2) ? $input2 : 0 ;
	  last SWITCH2; 
      }
      if ($input2->isa("Bio::PrimarySeqI")  && $executable  eq 'bl2seq' ) {
	  ($fh,$infilename2) = $self->io->tempfile();

	  $temp =  Bio::SeqIO->new(-fh=> $fh, '-format' => 'Fasta');
	  $temp->write_seq($input2);
	  close $fh;
	  undef $fh;
	  last SWITCH2;
      }
# Option for using psiblast's pre-alignment "jumpstart" feature
      elsif ($input2->isa("Bio::SimpleAlign")  && 
	     $executable  eq 'blastpgp' ) {
           # a bit of a lie since it won't be a fasta file
	  ($fh,$infilename2) = $self->io->tempfile(); 

# first we retrieve the "mask" that determines which residues should
# by scored according to their position and which should be scored
# using the non-position-specific matrices

	  my @mask = split("", shift );	#  get mask

# then we have to convert all the residues in every sequence to upper
# case at the positions that we want psiblast to use position specific
# scoring

	  foreach $seq ( $input2->each_seq() ) {
	      my @seqstringlist = split("",$seq->seq());
	      for (my $i = 0; $i < scalar(@mask); $i++) {
		  unless ( $seqstringlist[$i] =~ /[a-zA-Z]/ ) {next}
		  $seqstringlist[$i] = $mask[$i] ? uc $seqstringlist[$i]: lc $seqstringlist[$i] ;
	      }
	      my $newseqstring = join("", @seqstringlist);
	      $seq->seq($newseqstring);
	  }
          #  Now we need to write out the alignment to a file 
          # in the "psi format" which psiblast is expecting
	  $input2->map_chars('\.','-');
	  $temp =  Bio::AlignIO->new(-fh=> $fh, '-format' => 'psi');
	  $temp->write_aln($input2);
	  close $fh;
	  undef $fh;
	  last SWITCH2;
      }
      $infilename2 = 0;		# Set error flag if you get here
  }				# End SWITCH2
    return ($infilename1, $infilename2);
}

=head2  _setparams

 Title   : _setparams
 Usage   : Internal function, not to be called directly	
 Function: Create parameter inputs for Blast program
 Example :
 Returns : parameter string to be passed to Blast 
 Args    : Reference to calling object and name of BLAST executable

=cut

sub _setparams {
    my ($self,$executable) = @_;
    my ($attr, $value, @execparams);

    if ($executable eq 'blastall') {@execparams = @BLASTALL_PARAMS; }
    if ($executable eq 'blastpgp') {@execparams = @BLASTPGP_PARAMS; }
    if ($executable eq 'bl2seq') {@execparams = @BL2SEQ_PARAMS; }

    my $param_string = "";
    for $attr ( @execparams ) {
	$value = $self->$attr();
	next unless (defined $value);
# Need to prepend datadirectory to database name
	if ($attr  eq 'd' && ($executable ne 'bl2seq')) { 
# This is added so that you can specify a DB with a full path
	  if (! (-e $value.".nin" || -e $value.".pin")){ 
	    $value = File::Spec->catdir($DATADIR,$value);
	  }
	}
# put params in format expected by Blast
	$attr  = '-'. $attr ;       
	$param_string .= " $attr  $value ";
    }

# if ($self->quiet()) { $param_string .= '  >/dev/null';}

    return $param_string;
}


=head1 Bio::Tools::Run::Wrapper methods

=cut

=head2 no_param_checks

 Title   : no_param_checks
 Usage   : $obj->no_param_checks($newval)
 Function: Boolean flag as to whether or not we should
           trust the sanity checks for parameter values  
 Returns : value of no_param_checks
 Args    : newvalue (optional)


=cut

=head2 save_tempfiles

 Title   : save_tempfiles
 Usage   : $obj->save_tempfiles($newval)
 Function: 
 Returns : value of save_tempfiles
 Args    : newvalue (optional)


=cut

=head2 outfile_name

 Title   : outfile_name
 Usage   : my $outfile = $tcoffee->outfile_name();
 Function: Get/Set the name of the output file for this run
           (if you wanted to do something special)
 Returns : string
 Args    : [optional] string to set value to


=cut


=head2 tempdir

 Title   : tempdir
 Usage   : my $tmpdir = $self->tempdir();
 Function: Retrieve a temporary directory name (which is created)
 Returns : string which is the name of the temporary directory
 Args    : none


=cut

=head2 cleanup

 Title   : cleanup
 Usage   : $tcoffee->cleanup();
 Function: Will cleanup the tempdir directory after a PAML run
 Returns : none
 Args    : none


=cut

=head2 io

 Title   : io
 Usage   : $obj->io($newval)
 Function:  Gets a L<Bio::Root::IO> object
 Returns : L<Bio::Root::IO>
 Args    : none


=cut

sub DESTROY {
    my $self= shift;
    unless ( $self->save_tempfiles ) {
	$self->cleanup();
    }
    $self->SUPER::DESTROY();
}

1;
__END__