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=over 4

=item -is field,value

Limit the results to entities where the given field has the given value.

=item -like field,value

Limit the results to entities where the given field is LIKE (in the sql sense) the given value.

=item -op operator,field,value

Limit the results to entities where the given field is related to the given value based on the given operator.

The operators supported are as follows. We provide text based alternatives to the comparison
operators so that extra quoting is not required to keep the command-line shell from 
confusing them with shell I/O redirection operators.

=over 4

=item < or lt

=item > or gt

=item <=  or le

=item >= or ge

=item =

=item LIKE

=back

=item -a

Return all fields.

=item -h

Display a list of the fields available for use.

=item -fields field-list

Choose a set of fields to return. Field-list is a comma-separated list of 
strings. The following fields are available:

=over 4

=item label

=item abbr

=item msid

=item ubiquitous

=item mod_date

=item uncharged_formula

=item formula

=item mass

=back    
   
=back

=head2 Output Format

The standard output is a tab-delimited file containing a column
for each requested field.

=cut

use Bio::KBase::CDMI::CDMIClient;
use Getopt::Long;

#Default fields

my @all_fields = ( 'label', 'abbr', 'msid', 'ubiquitous', 'mod_date', 'uncharged_formula', 'formula', 'mass' );
my %all_fields = map { $_ => 1 } @all_fields, 'id';

my $usage = "usage: query_entity_Compound [-is field,value] [-like field,value] [-op operator,field,value] [-show-fields] [-a | -f field list] > entity.data";

my $a;
my $f;
my @fields;
my $show_fields;
my @query_is;
my @query_like;
my @query_op;

my %op_map = ('>', '>',
	      'gt', '>',
	      '<', '<',
	      'lt', '<',
	      '>=', '>=',
	      'ge', '>=',
	      '<=', '<=',
	      'le', '<=',
	      'like', 'LIKE',
	      );

my $geO = Bio::KBase::CDMI::CDMIClient->new_get_entity_for_script("a" 		=> \$a,
								  "show-fields" => \$show_fields,
								  "h" 		=> \$show_fields,
								  "is=s"	=> \@query_is,
								  "like=s"	=> \@query_like,
								  "op=s"	=> \@query_op,
								  "fields=s"    => \$f);

if ($show_fields)
{
    print STDERR "Available fields: @all_fields\n";
    exit 0;
}

if (@ARGV != 0 || ($a && $f))
{
    print STDERR $usage, "\n";
    exit 1;
}

if ($a)
{
    @fields = @all_fields;
}
elsif ($f) {
    my @err;
    for my $field (split(",", $f))
    {
	if (!$all_fields{$field})
	{
	    push(@err, $field);
	}
	else
	{
	    push(@fields, $field);
	}
    }