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package OPTIMADE::Filter::Comparison;
use strict;
use warnings;
use parent 'OPTIMADE::Filter::Modifiable';
use Scalar::Util qw(blessed);
our $VERSION = '0.11.0'; # VERSION
sub new {
my( $class, $operator ) = @_;
return bless { operands => [], operator => $operator }, $class;
}
sub push_operand
{
my( $self, $operand ) = @_;
die 'attempt to insert more than two operands' if @{$self->{operands}} >= 2;
push @{$self->{operands}}, $operand;
}
sub unshift_operand
{
my( $self, $operand ) = @_;
die 'attempt to insert more than two operands' if @{$self->{operands}} >= 2;
unshift @{$self->{operands}}, $operand;
}
sub operator
{
my( $self, $operator ) = @_;
my $previous_operator = $self->{operator};
$self->{operator} = $operator if defined $operator;
return $previous_operator;
}
sub left
{
my( $self, $operand ) = @_;
my $previous_operand = $self->{operands}[0];
$self->{operands}[0] = $operand if defined $operand;
return $previous_operand;
}
sub right
{
my( $self, $operand ) = @_;
my $previous_operand = $self->{operands}[1];
$self->{operands}[1] = $operand if defined $operand;
return $previous_operand;
}
sub to_filter
{
my( $self ) = @_;
$self->validate;
my $operator = $self->{operator};
my @operands;
for my $i (0..$#{$self->{operands}}) {
my $arg = $self->{operands}[$i];
if( blessed $arg && $arg->can( 'to_filter' ) ) {
$arg = $arg->to_filter;
} else {
$arg =~ s/\\/\\\\/g;
$arg =~ s/"/\\"/g;
$arg = "\"$arg\"";
}
push @operands, $arg;
}
return "($operands[0] $operator $operands[1])";
}
sub to_SQL
{
my( $self, $options ) = @_;
$self->validate;
$options = {} unless $options;
my( $delim, $placeholder ) = (
$options->{delim},
$options->{placeholder},
);
$delim = "'" unless $delim;
my $operator = $self->{operator};
my @operands = @{$self->{operands}};
# Handle STARTS/ENDS WITH
if( $operator eq 'CONTAINS' ) {
$operator = 'LIKE';
$operands[1] = '%' . $operands[1] . '%' if !blessed $operands[1];
} elsif( $operator =~ /^STARTS( WITH)?$/ ) {
$operator = 'LIKE';
$operands[1] = $operands[1] . '%' if !blessed $operands[1];
} elsif( $operator =~ /^ENDS( WITH)?$/ ) {
$operator = 'LIKE';
$operands[1] = '%' . $operands[1] if !blessed $operands[1];
}
my @values;
my @operands_now;
for my $arg (@operands) {
my $sql = $arg;
if( blessed $arg && $arg->can( 'to_SQL' ) ) {
( $sql, my $values ) = $arg->to_SQL( $options );
if( $arg->isa( OPTIMADE::Filter::Comparison:: ) ) {
$sql = "($sql)";
}
push @values, @$values;
} else {
push @values, $arg;
if( $placeholder ) {
$sql = $placeholder;
} else {
$sql =~ s/"/""/g;
$sql = "\"$sql\"";
}
}
push @operands_now, $sql;
}
@operands = @operands_now;
if( wantarray ) {
return ( "$operands[0] $operator $operands[1]", \@values );
} else {
return "$operands[0] $operator $operands[1]";
}
}
sub modify
{
my $self = shift;
my $code = shift;
$self->{operands} = [ map { OPTIMADE::Filter::Modifiable::modify( $_, $code, @_ ) }
@{$self->{operands}} ];
return $code->( $self, @_ );
}
sub validate
{
my $self = shift;
if( @{$self->{operands}} != 2 ) {
die 'number of operands for OPTIMADE::Filter::Comparison must be 2, ' .
'got ' . @{$self->{operands}};
}
die 'operator undefined for OPTIMADE::Filter::Comparison'
if !$self->operator;
}
1;
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