+# id3fs - a FUSE-based filesystem for browsing audio metadata
+# Copyright (C) 2010 Ian Beckwith <ianb@erislabs.net>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
package ID3FS::Path::Node;
use strict;
use warnings;
+require Exporter;
+use vars qw(@ISA @EXPORT $TYPE_BOOL $TYPE_TAG $TYPE_ARTIST $TYPE_ALBUM $TYPE_FILE);
+@ISA=qw(Exporter);
+@EXPORT=qw($TYPE_BOOL $TYPE_TAG $TYPE_ARTIST $TYPE_ALBUM $TYPE_FILE);
+($TYPE_BOOL, $TYPE_TAG, $TYPE_ARTIST, $TYPE_ALBUM, $TYPE_FILE)=(1..5);
+
sub new
{
my $proto=shift;
my $self={};
bless($self,$class);
- $self->left(shift);
- $self->op(shift);
- $self->right(shift);
-
+ my $db=shift;
+ $self->{type}=shift;
+ $self->{name}=shift;
+ $self->{parents_id}=shift;
+ if($self->{type} != $TYPE_BOOL)
+ {
+ my $table='';
+ if ($self->{type} == $TYPE_TAG) { $table="tags"; }
+ elsif($self->{type} == $TYPE_ARTIST) { $table="artists"; }
+ elsif($self->{type} == $TYPE_ALBUM) { $table="albums"; }
+ elsif($self->{type} == $TYPE_FILE) { $table="files"; }
+ $self->{id}=$db->lookup_id($table, $self->{name}, $self->{parents_id});
+ return undef unless(defined($self->{id}));
+ }
return $self;
}
return $self->{$name};
}
-sub left { return shift->set("left", shift); }
-sub right { return shift->set("right", shift); }
-sub op { return shift->set("op", shift); }
+sub left { return shift->set("left", shift); }
+sub right { return shift->set("right", shift); }
+sub name { return shift->set("name", shift); }
+sub type { return shift->set("type", shift); }
+sub id { return shift->set("id", shift); }
+sub parents_id { return shift->set("parents_id", shift); }
-sub print
+sub to_sql
{
- my($self)=@_;
- my $op=$self->op();
- my $left=$self->left();
- my $right=$self->right();
- return "" unless($left || $right);
- my $str .= $self->print_node($left);
- $str .= (" " . $op->{name} . " ") if($op);
- $str .= $self->print_node($right);
- if($op || ($left && $right))
+ my($self, $hasvals, $not, @joins)=@_;
+ $not=0 unless(defined($not));
+ my @outjoins=();
+ unless(@joins)
{
- $str="(" . $str . ")";
+ @outjoins = @joins = ("INNER");
}
- return $str;
-}
+ my $str='';
-sub print_node
-{
- my($self, $node)=@_;
- return "" unless(defined($node));
- return $node->print() if(ref($node) eq "ID3FS::Path::Node");
- return $node->{name};
-}
+ if($self->type() != $TYPE_BOOL)
+ {
+ $str .= "t" . scalar(@joins) . ".id='" . $self->{id} . "'";
+ if($not && !$hasvals)
+ {
+ $str = "(" . $str . " AND fxt" . scalar(@joins) . ".files_id IS NULL)";
+ }
+ return ($str, @outjoins);
+ }
-sub to_sql
-{
- my($self, $andlevel, $parent_is_tag)=@_;
- $andlevel=1 unless(defined($andlevel));
- $parent_is_tag=0 unless(defined($parent_is_tag));
- my ($leftandlevel, $rightandlevel);
- my ($leftstr, $rightstr);
- my $op=$self->op();
my $left=$self->left();
my $right=$self->right();
- return ("", $andlevel) unless($left || $right);
- ($leftstr, $leftandlevel) = $self->node_to_sql($left, $andlevel);
- $andlevel=$self->max($andlevel, $leftandlevel);
- if(defined($op) && (($op->{name} eq "AND") || ($op->{name} eq "NOT")))
+ return ("", @outjoins) unless($left || $right);
+
+ my ($leftstr, @leftjoins) = $left->to_sql($hasvals, $not, @joins) if($left);
+ push(@joins, @leftjoins);
+ push(@outjoins, @leftjoins);
+
+ my $op=$self->name();
+ if(defined($op))
{
- $andlevel++;
+ my $join=undef;
+ # if right child is a NOT, we don't need extra join/brackets
+ # NOT will do the same and we will end up with an extra one
+ unless($right && $right->name() && $right->name() eq "NOT")
+ {
+ # if we are ANDing or ORing, add an inner join
+ # also if we are NOTing, but we are looking for a tag *value*
+ if($op eq "AND")
+ {
+ $join= "INNER";
+ }
+ elsif($op eq "NOT")
+ {
+ $not=1;
+ $join = ($hasvals ? "INNER" : "LEFT");
+ }
+ elsif($op eq "OR")
+ {
+ $join="INNER" unless($left && $left->name() && $left->name() eq "NOT")
+ }
+ }
+ if($join)
+ {
+ push(@joins, $join);
+ push(@outjoins, $join);
+ }
}
- ($rightstr, $rightandlevel) = $self->node_to_sql($right, $andlevel);
- my $str=$leftstr;
- $str .= (" " . $op->{name} . " ") if($op);
+ my ($rightstr, @rightjoins) = $right->to_sql($hasvals, $not, @joins) if($right);
+ push(@outjoins, @rightjoins);
+ $str = $leftstr;
+ $str .= " $op " if($op && !$not);
$str .= $rightstr;
- if($op || ($left && $right))
- {
- $str="(" . $str . ")";
- }
- return($str, $self->max($leftandlevel, $rightandlevel));
+ $str=("(" . $str . ")") if($op && $left && $right);
+ return($str, @outjoins);
}
-sub node_to_sql
+sub used_tags
{
- my($self, $node, $andlevel)=@_;
- return ("", $andlevel) unless(defined($node));
- return $node->to_sql($andlevel) if(ref($node) eq "ID3FS::Path::Node");
- # FIXME: switch to id when debugged
-# return( ( "fxt" . $andlevel . "=\"" . $node->{id} . "\""), $andlevel);
- return( ( "fxt" . $andlevel . "=\"" . $node->{name} . "\""), $andlevel);
-}
-
-sub max
-{
- my($self, $a, $b)=@_;
- return(($a > $b) ? $a : $b);
+ my($self)=@_;
+ if($self->type() == $TYPE_BOOL)
+ {
+ my @used=();
+ push(@used, $self->left()->used_tags()) if($self->left());
+ push(@used, $self->right()->used_tags()) if($self->right());
+ return(grep { defined; } @used);
+ }
+ return $self->id();
}
1;
projects / id3fs.git / blobdiff