--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/Schema/DB/Table.pm	Tue Jul 14 12:54:37 2009 +0400
@@ -0,0 +1,168 @@
+use strict;
+package Schema::DB::Table;
+use Carp;
+use Common;
+
+use Schema::DB::Column;
+use Schema::DB::Constraint;
+use Schema::DB::Constraint::PrimaryKey;
+use Schema::DB::Constraint::ForeignKey;
+
+our @ISA = qw(Object);
+
+srand time;
+
+BEGIN {
+    DeclareProperty Name => ACCESS_READ;
+    DeclareProperty Schema => ACCESS_READ;
+    DeclareProperty Columns => ACCESS_READ;
+    DeclareProperty Constraints => ACCESS_READ;
+    DeclareProperty ColumnsByName => ACCESS_NONE;
+    DeclareProperty PrimaryKey => ACCESS_READ;
+    DeclareProperty Tag => ACCESS_ALL;
+}
+
+sub CTOR {
+    my ($this,%args) = @_;
+    
+    $this->{$Name} = $args{'Name'} or die new Exception('a table name is required');
+    $this->{$Schema} = $args{'Schema'} or die new Exception('a parent schema is required');
+}
+
+sub InsertColumn {
+    my ($this,$column,$index) = @_;
+    
+    $index = ($this->{$Columns} ? scalar(@{$this->{$Columns}}) : 0) if not defined $index;
+    
+    die new Exception("Index is out of range") if ($index < 0 || $index > ($this->{$Columns} ? scalar(@{$this->{$Columns}}) : 0));
+    
+    if (UNIVERSAL::isa($column,'Schema::DB::Column')) {
+        
+    } elsif (UNIVERSAL::isa($column,'HASH')) {
+        $column = new Schema::DB::Column(%{$column});
+    } else {
+        die new Exception("The invalid parameter");
+    }
+    
+    if (exists $this->{$ColumnsByName}->{$column->Name}) {
+        die new Exception("The column already exists",$column->name);
+    } else {
+        $this->{$ColumnsByName}->{$column->Name} = $column;
+        splice @{$this->{$Columns}},$index,0,$column;
+    }
+    
+    return $column;
+}
+
+sub RemoveColumn {
+    my ($this,$NameOrColumn,$Force) = @_;
+    
+    my $ColName;
+    if (UNIVERSAL::isa($NameOrColumn,'Schema::DB::Column')) {
+        $ColName = $NameOrColumn->Name;
+    } elsif (not ref $NameOrColumn) {
+        $ColName = $NameOrColumn;
+    }
+        
+    if (exists $this->{$ColumnsByName}->{$ColName}) {
+        my $index = 0;
+        foreach my $column(@{$this->{$Columns}}) {
+            last if $column->Name eq $ColName;
+            $index++;
+        }
+        
+        my $column = $this->{$Columns}[$index];
+        if (my @constraints = $this->GetColumnConstraints($column)){
+            $Force or die new Exception('Can\'t remove column which is used in the constraints',@constraints);
+            $this->RemoveConstraint($_) foreach @constraints;
+        }
+        
+        my $removed = splice @{$this->{$Columns}},$index,1;
+        delete $this->{$ColumnsByName}->{$ColName};
+        return $removed;
+    } else {
+        die new Exception("The column not found",$NameOrColumn->Name);
+    }
+}
+
+sub Column {
+    my ($this,$name) = @_;
+    
+    return $this->{$ColumnsByName}->{$name};
+}
+
+sub ColumnAt {
+    my ($this,$index) = @_;
+    
+    die new Exception("The index is out of range") if $index < 0 || $index >= ($this->{$Columns} ? scalar(@{$this->{$Columns}}) : 0);
+    
+    return $this->{$Columns}[$index];
+}
+
+sub AddConstraint {
+    my ($this,$Constraint) = @_;
+    
+    die new Exception('The invalid parameter') if not UNIVERSAL::isa($Constraint,'Schema::DB::Constraint');
+    
+    $Constraint->Table == $this or die new Exception('The constaint must belong to the target table');
+    
+    if (exists $this->{$Constraints}->{$Constraint->Name}) {
+        die new Exception('The table already has the specified constraint',$Constraint->Name);
+    } else {
+        if (UNIVERSAL::isa($Constraint,'Schema::DB::Constraint::PrimaryKey')) {
+            not $this->{$PrimaryKey} or die new Exception('The table already has a primary key');
+            $this->{$PrimaryKey} = $Constraint;
+        }
+        
+        $this->{$Constraints}->{$Constraint->Name} = $Constraint;
+    }
+}
+
+sub RemoveConstraint {
+    my ($this,$Constraint,$Force) = @_;
+    
+    my $cn = UNIVERSAL::isa($Constraint,'Schema::DB::Constraint') ? $Constraint->Name : $Constraint;
+    $Constraint = $this->{$Constraints}->{$cn} or die new Exception('The specified constraint doesn\'t exists',$cn);
+    
+    if (UNIVERSAL::isa($Constraint,'Schema::DB::Constraint::PrimaryKey')) {
+        not scalar keys %{$this->{$PrimaryKey}->ConnectedFK} or die new Exception('Can\'t remove Primary Key unless some foreign keys referenses it');
+        
+        delete $this->{$PrimaryKey};
+    }
+    $Constraint->Dispose;
+    delete $this->{$Constraints}->{$cn};
+    return $cn;
+}
+
+sub GetColumnConstraints {
+    my ($this,@Columns) = @_;
+    
+    my @cn = map { UNIVERSAL::isa($_ ,'Schema::DB::Column') ? $_ ->Name : $_ } @Columns;
+    exists $this->{$ColumnsByName}->{$_} or die new Exception('The specified column isn\'t found',$_) foreach @cn;
+    
+    return grep {$_->HasColumn(@cn)} values %{$this->{$Constraints}};
+}
+
+sub SetPrimaryKey {
+    my ($this,@ColumnList) = @_;
+    
+    $this->AddConstraint(new Schema::DB::Constraint::PrimaryKey(Name => $this->{$Name}.'_PK', Table => $this,Columns => \@ColumnList));
+}
+
+sub LinkTo {
+    my ($this,$table,@ColumnList) = @_;
+    $table->PrimaryKey or die new Exception('The referenced table must have a primary key');
+    my $constraintName = $this->{$Name}.'_'.$table->Name.'_FK_'.join('_',map {ref $_ ? $_->Name : $_} @ColumnList);
+    $this->AddConstraint(new Schema::DB::Constraint::ForeignKey(Name => $constraintName, Table => $this,Columns => \@ColumnList, ReferencedTable => $table, ReferencedColumns => scalar($table->PrimaryKey->Columns)));
+}
+
+sub Dispose {
+    my ($this) = @_;
+    
+    $_->Dispose() foreach values %{$this->{$Constraints}};
+    
+    undef %{$this};
+    $this->SUPER::Dispose();
+}
+
+1;