annotate Lib/Common.pm @ 72:eac47fa4f262

docs
author wizard
date Fri, 26 Mar 2010 16:26:31 +0300
parents 16ada169ca75
children 76515373dac0
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1 package Common;
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2 use strict;
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3 no strict 'refs';
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4
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5 require Exporter;
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6
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7 our @ISA = qw(Exporter);
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8 our @EXPORT = qw(&ACCESS_NONE &ACCESS_READ &ACCESS_WRITE &ACCESS_ALL &DeclareProperty &DumpCaller &PropertyList &CloneObject);
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9
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10 our $Debug;
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11
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12 $Debug = 1 if not defined $Debug;
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13
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14 my %ListProperties;
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15 my %GlobalContext;
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16
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17 1;
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18
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19 sub ACCESS_NONE () { 0 }
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20 sub ACCESS_READ () { 1 }
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21 sub ACCESS_WRITE () { 2 }
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22 sub ACCESS_ALL () {ACCESS_READ | ACCESS_WRITE}
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23
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24 sub PropertyList {
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25 return $ListProperties{ref($_[0]) || $_[0] || caller} || {};
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26 }
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27
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28 sub DeclareProperty {
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29 my ($attrName,$accessRights,%Mutators) = @_;
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30
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31 my $Package = caller;
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32 my $Method = $Package.'::'.$attrName;
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33 my $fldName;
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34
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35 my $getMutator = $Mutators{'get'};
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36 my $setMutator = $Mutators{'set'};
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37
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38 ($fldName = $Method) =~ s/:+/_/g;
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39
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40 $ListProperties{$Package} = {} if not exists $ListProperties{$Package};
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41 $ListProperties{$Package}->{$attrName} = $fldName;
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42
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43 if ($Debug) {
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44 *$Method = sub {
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45 my $this = shift;
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46
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47 die new Exception( 'too many args ['.scalar(@_).'\]' , "'$Method' called from: ".DumpCaller() ) if (@_ > 1);
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48
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49 my $Rights = $accessRights;
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50 $Rights = ACCESS_ALL if $Package eq caller;
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51
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52 if (@_){
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53 die new Exception("access denied 'write $Method'", "'$Method' called from: ".DumpCaller()) if not $Rights & ACCESS_WRITE;
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54 if (defined $setMutator) {
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55 &$setMutator($this,$fldName,shift);
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56 } else {
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57 $this->{$fldName} = $_[0];
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58 }
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59
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60 } elsif (defined wantarray) {
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61 die new Exception("access denied 'read $Method'", "'$Method' called from: ".DumpCaller()) if not $Rights & ACCESS_READ;
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62 if (defined $getMutator) {
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63 &$getMutator($this,$fldName);
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64 } else {
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65 if (wantarray){
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66 if(ref $this->{$fldName} eq 'ARRAY' ) {
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67 return @{$this->{$fldName}};
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68 } elsif (not exists $this->{$fldName}) {
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69 return;
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70 } else {
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71 return $this->{$fldName};
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72 }
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73 } else {
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74 return $this->{$fldName};
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75 }
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76 }
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77 } else {
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78 undef;
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79 }
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80 };
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81 *$Method = \$fldName;
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82 } else {
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83 *$Method = sub {
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84 my $this = shift;
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85 #return undef if @_ > 1;
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86 #my $Rights = $accessRights;
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87 #$Rights = ACCESS_ALL if $Package eq caller;
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88
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89 if (@_){
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90 # return undef if not $Rights & ACCESS_WRITE;
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91 if (defined $setMutator) {
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92 &$setMutator($this,$fldName,shift);
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93 } else {
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94 $this->{$fldName} = shift;
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95 }
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96 } elsif (defined wantarray) {
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97 # return undef if not $Rights & ACCESS_READ;
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98 if (defined $getMutator) {
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99 &$getMutator($this,$fldName);
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100 } else {
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101 if (wantarray){
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102 if(ref $this->{$fldName} eq 'ARRAY' ) {
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103 return @{$this->{$fldName}};
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104 } elsif (not defined $this->{$fldName}) {
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105 return;
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106 } else {
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107 return $this->{$fldName};
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108 }
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109 } else {
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110 return $this->{$fldName};
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111 }
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112 }
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113 } else {
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114 undef;
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115 }
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116 };
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117 *$Method = \$fldName;
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118 }
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119 }
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120
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121 sub DumpCaller {
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122 return join(" ",(caller($_[0]))[1,2],(caller($_[0]+1))[3]);
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123 }
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124
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125 sub Owner {
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126 return undef if not tied $_[0];
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127 return undef if not tied($_[0])->UNIVERSAL::can('owner');
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128 return tied($_[0])->owner();
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129 };
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130
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131 sub CloneObject {
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132 my $object = shift;
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133 if (ref $object == undef) {
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134 return $object;
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135 } elsif (ref $object eq 'SCALAR') {
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136 return \CloneObject(${$object});
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137 } elsif (ref $object eq 'ARRAY') {
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138 return [map{CloneObject($_)}@{$object}];
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139 } elsif (ref $object eq 'HASH') {
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140 my %clone;
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141 while (my ($key,$value) = each %{$object}) {
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142 $clone{$key} = CloneObject($value);
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143 }
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144 return \%clone;
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145 } elsif (ref $object eq 'REF') {
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146 return \CloneObject(${$object});
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147 } else {
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148 if ($object->can('Clone')) {
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149 return $object->Clone();
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150 } else {
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151 die new Exception('Object doesn\'t supports cloning');
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152 }
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153 }
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154 }
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155
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156 package Exception;
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157 use base qw(IMPL::Exception);
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158
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159 package Persistent;
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160 import Common;
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161
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162 sub newSurogate {
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163 my $class = ref($_[0]) || $_[0];
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164 return bless {}, $class;
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165 }
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166 sub load {
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167 my ($this,$context) = @_;
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168 die new Exception("invalid deserialization context") if ref($context) ne 'ARRAY';
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169 die new Exception("This is not an object") if not ref $this;
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170
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171 my %Props = (@{$context});
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172 foreach my $BaseClass(@{ref($this).'::ISA'}) {
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173 while (my ($key,$value) = each %{PropertyList($BaseClass)}) {
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174 $this->{$value} = $Props{$value} if exists $Props{$value};
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175 }
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176 }
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177
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178 while (my ($key,$value) = each %{PropertyList(ref($this))}) {
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179 $this->{$value} = $Props{$key} if exists $Props{$key};
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180 }
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181 return 1;
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182 }
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183 sub save {
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184 my ($this,$context) = @_;
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185
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186 foreach my $BaseClass(@{ref($this).'::ISA'}) {
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187 while (my ($key,$value) = each %{PropertyList($BaseClass)}) {
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188 $context->AddVar($value,$this->{$value});
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189 }
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190 }
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191
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192 while (my ($key,$value) = each %{PropertyList(ref($this))}) {
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193 $context->AddVar($key,$this->{$value});
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194 }
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195 return 1;
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196 }
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197
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198 sub restore {
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199 my ($class,$context,$surogate) = @_;
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200 my $this = $surogate || $class->newNewSurogate;
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201 $this->load($context);
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202 return $this;
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203 }
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204
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205 package Object;
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206 import Common;
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207
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208 sub new {
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209 my $class = shift;
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210 my $self = bless {}, ref($class) || $class;
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211 $self->CTOR(@_);
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212 return $self;
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213 }
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214
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215 sub cast {
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216 return bless {}, ref $_[0] || $_[0];
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217 }
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218
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219 our %objects_count;
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220 our %leaked_objects;
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221
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222 sub CTOR {
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223 my $this= shift;
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224 $objects_count{ref $this} ++ if $Debug;
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225 my %args = @_ if scalar (@_) > 0;
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226 return if scalar(@_) == 0;
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227
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228 warn "invalid args in CTOR. type: ".(ref $this) if scalar(@_) % 2 != 0;
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229 my @packages = (ref($this));
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230 my $countArgs = int(scalar(@_) / 2);
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231 #print "Set ", join(', ',keys %args), "\n";
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232 LOOP_PACKS: while(@packages) {
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233 my $package = shift @packages;
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234 #print "\t$package\n";
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235 my $refProps = PropertyList($package);
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236 foreach my $name (keys %{$refProps}) {
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237 my $fld = $refProps->{$name};
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238 if (exists $args{$name}) {
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239 $this->{$fld} = $args{$name};
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240 #print "\t$countArgs, $name\n";
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241 delete $args{$name};
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242 $countArgs --;
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243 last LOOP_PACKS if $countArgs < 1;
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244 } else {
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245 #print "\t-$name ($fld)\n";
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246 }
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247 }
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248 push @packages, @{$package.'::ISA'};
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249 }
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250 }
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251
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252 sub Dispose {
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253 my $this = shift;
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254
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255 if ($Debug and UNIVERSAL::isa($this,'HASH')) {
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256 my @keys = grep { $this->{$_} and ref $this->{$_} } keys %{$this};
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257 warn "not all fields of the object were deleted\n".join("\n",@keys) if @keys;
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258 }
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259
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260 bless $this,'Object::Disposed';
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261 }
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262
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263 our $MemoryLeakProtection;
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264
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265 sub DESTROY {
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266 if ($MemoryLeakProtection) {
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267 my $this = shift;
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268 warn sprintf("Object leaks: %s of type %s %s",$this,ref $this,UNIVERSAL::can($this,'_dump') ? $this->_dump : '');
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269 }
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270 }
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271
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272 package Object::Disposed;
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273 our $AUTOLOAD;
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274 sub AUTOLOAD {
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275 return if $AUTOLOAD eq __PACKAGE__.'::DESTROY';
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276 die new Exception('Object have been disposed',$AUTOLOAD);
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277 }
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278
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279 END {
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280 $MemoryLeakProtection = 0 if not $Debug;
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281 }
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282 1;