--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/Schema/DB/Constraint/ForeignKey.pm	Tue Jul 14 12:54:37 2009 +0400
@@ -0,0 +1,58 @@
+package Schema::DB::Constraint::ForeignKey;
+use strict;
+use Common;
+use base qw(Schema::DB::Constraint);
+
+BEGIN {
+    DeclareProperty ReferencedPrimaryKey => ACCESS_READ;
+    DeclareProperty OnDelete => ACCESS_READ;
+    DeclareProperty OnUpdate => ACCESS_READ;
+}
+
+sub CTOR {
+    my ($this,%args) = @_;
+    
+    $this->SUPER::CTOR(%args);
+    
+    
+    die new Eexception("Referenced table must be an instance of a table object") if not UNIVERSAL::isa($args{'ReferencedTable'},'Schema::DB::Table');
+    
+    die new Exception("Referenced columns must be a not empty list of columns") if not UNIVERSAL::isa($args{'ReferencedColumns'},'ARRAY') or not scalar(@{$args{'ReferencedColumns'}});
+    
+    my @ReferencedColumns = map {Schema::DB::Constraint::ResolveColumn($args{'ReferencedTable'},$_)} @{$args{'ReferencedColumns'}};
+    my $ForeingPK = $args{'ReferencedTable'}->PrimaryKey or die new Exception('The referenced table doesn\'t have a primary key');
+    
+    scalar (@ReferencedColumns) == scalar(@{$this->Columns}) or die new Exception('A foreing key columns doesn\'t match refenced columns');
+    my @ColumnsCopy = @ReferencedColumns;
+    
+    die new Exception('A foreing key columns doesn\'t match refenced columns') if grep { not $_->Type->isSame((shift @ColumnsCopy)->Type)} $this->Columns;
+    
+    @ColumnsCopy = @ReferencedColumns;
+    die new Exception('The foreign key must match to the primary key of the referenced table',$this->Name) if grep { not $_->Type->isSame(shift(@ColumnsCopy)->Type)} $ForeingPK->Columns;
+    
+    $this->{$ReferencedPrimaryKey} = $ForeingPK;
+    
+    $ForeingPK->ConnectFK($this);
+}
+
+sub Dispose {
+    my ($this) = @_;
+
+    $this->{$ReferencedPrimaryKey}->DisconnectFK($this) if not $this->{$ReferencedPrimaryKey}->isa('Object::Disposed');
+    delete $this->{$ReferencedPrimaryKey};
+    
+    $this->SUPER::Dispose;
+}
+
+sub isSame {
+    my ($this,$other) = @_;
+    
+    uc $this->OnDelete eq uc $other->OnDelete or return 0;
+    uc $this->OnUpdate eq uc $other->OnUpdate or return 0;
+    
+    return $this->SUPER::isSame($other);
+}
+
+
+
+1;
\ No newline at end of file