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49
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1 package IMPL::Class::Property::Direct;
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2 use strict;
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3
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4 use base qw(IMPL::Object::Accessor Exporter);
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5 our @EXPORT = qw(_direct);
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6
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7 use IMPL::Class::Property;
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8 require IMPL::Exception;
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9
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10 __PACKAGE__->mk_accessors qw(ExportField);
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11
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12 sub _direct($) {
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13 my ($prop_info) = @_;
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14 $prop_info->Implementor( IMPL::Class::Property::Direct->new({ExportField => 1}) );
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15 return $prop_info;
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16 }
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17
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18 my $access_private = "die new IMPL::Exception('Can\\'t access the private member',\$name,\$class,scalar caller) unless caller eq \$class;";
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19 my $access_protected = "die new IMPL::Exception('Can\\'t access the protected member',\$name,\$class,scalar caller) unless caller eq \$class;";
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20
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21 my $accessor_get_no = 'die new IMPL::Exception(\'The property is write only\',$name,$class) unless $get;';
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22 my $accessor_set_no = 'die new IMPL::Exception(\'The property is read only\',$name,$class) unless $set;';
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23 my $accessor_set = 'return( $this->{$field} = @_ == 1 ? $_[0] : [@_] );';
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24 my $accessor_get = 'return( $this->{$field} );';
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25 my $list_accessor_set = 'return( @{ ($this->{$field} = ( (@_ == 1 and ref $_[0] eq \'ARRAY\') ? $_[0] : [@_] ) || [] ) } );';
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26 my $list_accessor_get = 'return( @{ $this->{$field} || [] } );';
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27 my $custom_accessor_get = 'unshift @_, $this and goto &$get;';
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28 my $custom_accessor_set = 'unshift @_, $this and goto &$set;';
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29
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30 my %accessor_cache;
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31 sub mk_acessor {
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32 my ($virtual,$access,$class,$name,$mutators,$field) = @_;
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33
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34 my ($get,$set) = ref $mutators ? ( $mutators->{get}, $mutators->{set}) : ($mutators & prop_get, $mutators & prop_set);
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35 my $key = join '',$virtual,$access,$get ? 1 : 0,$set ? 1 : 0, (ref $mutators ? 'c' : ($mutators & prop_list() ? 'l' : 's'));
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36 my $factory = $accessor_cache{$key};
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37 if (not $factory) {
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38 my $code =
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39 <<BEGIN;
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40 sub {
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41 my (\$class,\$name,\$set,\$get,\$field) = \@_;
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42 my \$accessor;
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43 \$accessor = sub {
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44 my \$this = shift;
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45 BEGIN
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46 $code .= <<VCALL if $virtual;
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47 my \$method = \$this->can(\$name);
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48 return \$this->\$method(\@_) unless \$method == \$accessor or caller->isa(\$class);
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49 VCALL
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50 $code .= "$access_private\n" if $access == IMPL::Class::Member::MOD_PRIVATE;
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51 $code .= "$access_protected\n" if $access == IMPL::Class::Member::MOD_PROTECTED;
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52 my ($codeGet,$codeSet);
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53 if (ref $mutators) {
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54 $codeGet = $get ? $custom_accessor_get : $accessor_get_no;
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55 $codeSet = $set ? $custom_accessor_set : $accessor_set_no;
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56 } else {
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57 if ($mutators & prop_list) {
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58 $codeGet = $get ? $list_accessor_get : $accessor_get_no;
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59 $codeSet = $set ? $list_accessor_set : $accessor_set_no;
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60 } else {
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61 $codeGet = $get ? $accessor_get : $accessor_get_no;
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62 $codeSet = $set ? $accessor_set : $accessor_set_no;
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63 }
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64 }
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65 $code .=
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66 <<END;
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67 if (\@_) {
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68 $codeSet
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69 } else {
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70 $codeGet
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71 }
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72 }
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73 }
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74 END
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75 $factory = eval $code or die new IMPL::Exception('Failed to generate the accessor',$@);
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76 $accessor_cache{$key} = $factory;
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77 }
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78 return $factory->($class,$name,$set,$get, $field);
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79 }
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80
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81 sub Make {
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82 my ($self,$propInfo) = @_;
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83
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84 my $isExportField = ref $self ? ($self->ExportField || 0) : 0;
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85 my ($class,$name,$virt,$access,$mutators) = $propInfo->get qw(Class Name Virtual Access Mutators);
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86 (my $field = "${class}_$name") =~ s/::/_/g;
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87
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88 my $propGlob = $class.'::'.$name;
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89
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90 no strict 'refs';
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91 *$propGlob = mk_acessor($virt,$access,$class,$name,$mutators,$field);
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92 *$propGlob = \$field if $isExportField;
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93
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94 if (ref $mutators) {
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95 $propInfo->canGet( $mutators->{get} ? 1 : 0);
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96 $propInfo->canSet( $mutators->{set} ? 1 : 0);
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97 } else {
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98 $propInfo->canGet( ($mutators & prop_get) ? 1 : 0);
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99 $propInfo->canSet( ($mutators & prop_set) ? 1 : 0);
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100 }
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101 }
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102
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103 sub FieldName {
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104 my ($self,$propInfo) = @_;
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105
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106 my ($class,$name) = $propInfo->get qw(Class Name);
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107 (my $field = "${class}_$name") =~ s/::/_/g;
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108 return $field;
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109 }
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110
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111 1;
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