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package Anansi::Class; |
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=head1 NAME |
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Anansi::Class - A base module definition |
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=head1 SYNOPSIS |
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package Anansi::Example; |
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use base qw(Anansi::Class); |
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sub finalise { |
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my ($self, %parameters) = @_; |
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} |
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sub initialise { |
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my ($self, %parameters) = @_; |
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} |
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1; |
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package main; |
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use Anansi::Example; |
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my $object = Anansi::Example->new(); |
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1; |
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=head1 DESCRIPTION |
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This is a base module definition that manages the creation and destruction of |
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module object instances including embedded objects and ensures that destruction |
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can only occur when an object is no longer used. Makes use of |
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L. |
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=cut |
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our $VERSION = '0.10'; |
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use Anansi::ObjectManager; |
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=head1 METHODS |
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=cut |
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=head2 DESTROY |
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=over 4 |
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=item self I<(Blessed Hash, Required)> |
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An object of this namespace. |
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=back |
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Performs module object instance clean-up actions. Calls the |
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L method prior to dereferencing the object. |
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Indirectly called by the perl interpreter. |
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=cut |
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sub DESTROY { |
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my ($self) = @_; |
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my $objectManager = Anansi::ObjectManager->new(); |
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if(1 == $objectManager->registrations($self)) { |
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$self->finalise(); |
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$objectManager->obsolete( |
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USER => $self, |
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); |
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$objectManager->unregister($self); |
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} |
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} |
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=head2 finalise |
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$OBJECT->finalise(); |
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$OBJECT->SUPER::finalise(); |
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=over 4 |
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=item self I<(Blessed Hash, Required)> |
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An object of this namespace. |
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=back |
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A virtual method. Called just prior to module instance object destruction. |
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=cut |
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sub finalise { |
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my ($self) = @_; |
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} |
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=head2 identification |
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=over 4 |
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=item self I<(Blessed Hash, Required)> |
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An object of this namespace. |
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=back |
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Returns this object's unique identification or B on error. |
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=cut |
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sub identification { |
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my ($self) = @_; |
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return if(ref($self) =~ /^(|ARRAY|CODE|FORMAT|GLOB|HASH|IO|LVALUE|REF|Regexp|SCALAR|VSTRING)$/i); |
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my $result; |
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eval { |
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$result = $self->isa('Anansi::Class'); |
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}; |
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return if($@); |
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return if(!$result); |
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return if(!defined($self->{Anansi})); |
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return if(ref($self->{Anansi}) !~ /^HASH$/i); |
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return if(!defined(${$self->{Anansi}}{ObjectManager})); |
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return if(ref(${$self->{Anansi}}{ObjectManager}) !~ /^HASH$/i); |
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return if(!defined(${${$self->{Anansi}}{ObjectManager}}{IDENTIFICATION})); |
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return if(ref(${${$self->{Anansi}}{ObjectManager}}{IDENTIFICATION}) !~ /^$/); |
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return if(${${$self->{Anansi}}{ObjectManager}}{IDENTIFICATION} =~ /^\s*$/); |
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return ${${$self->{Anansi}}{ObjectManager}}{IDENTIFICATION}; |
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} |
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=head2 implicate |
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143
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sub implicate { |
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my ($self, $caller, $parameter) = @_; |
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if('EXAMPLE_VARIABLE' eq $parameter) { |
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return \EXAMPLE_VARIABLE; |
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} |
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try { |
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return $self->SUPER::implicate($caller, $parameter); |
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} |
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return if($@); |
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} |
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154
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=over 4 |
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156
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=item self I<(Blessed Hash, Required)> |
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158
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An object of this namespace. |
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=item caller I<(Array, Required)> |
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An array containing the I, I and I of the caller. |
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164
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=item parameter I<(String, Required)> |
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166
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A string containing the name to import. |
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168
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=back |
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170
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A virtual method. Performs one module instance name import. Called for each |
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name to import. |
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173
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=cut |
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175
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sub implicate { |
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1
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my ($self, $caller, $parameter) = @_; |
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try { |
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return $self->SUPER::implicate($caller, $parameter); |
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} |
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return if($@); |
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} |
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184
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185
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=head2 import |
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187
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use Anansi::Example qw(EXAMPLE_VARIABLE); |
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189
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=over 4 |
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191
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=item self I<(Blessed Hash, Required)> |
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193
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An object of this namespace. |
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195
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=item parameters I<(Array, Optional)> |
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197
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An array containing all of the names to import. |
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=back |
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201
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Performs all required module name imports. Indirectly called via an extending |
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module. |
203
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204
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=cut |
205
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206
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207
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sub import { |
208
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1
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15
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my ($self, @parameters) = @_; |
209
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1
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17
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my $caller = caller(); |
210
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16
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foreach my $parameter (@parameters) { |
211
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my $value = $self->implicate($caller, $parameter); |
212
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*{$caller.'::'.$parameter} = $value if(defined($value)); |
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} |
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} |
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216
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217
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=head2 initialise |
218
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219
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$OBJECT->initialise(); |
220
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221
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$OBJECT->SUPER::initialise(); |
222
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223
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=over 4 |
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225
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=item self I<(Blessed Hash, Required)> |
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227
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An object of this namespace. |
228
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229
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=item parameters I<(Hash, Optional)> |
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231
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Named parameters that were supplied to the I method. |
232
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233
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=back |
234
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235
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A virtual method. Called just after module instance object creation. |
236
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237
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=cut |
238
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239
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240
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sub initialise { |
241
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0
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0
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1
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my ($self, %parameters) = @_; |
242
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} |
243
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244
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245
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=head2 namespace |
246
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247
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=over 4 |
248
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249
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=item self I<(Blessed Hash, Required)> |
250
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251
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An object of this namespace. |
252
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253
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=back |
254
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255
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Returns this object's namespace or B on error. |
256
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257
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=cut |
258
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259
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260
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sub namespace { |
261
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0
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1
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my ($self) = @_; |
262
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0
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0
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return if(ref($self) =~ /^(|ARRAY|CODE|FORMAT|GLOB|HASH|IO|LVALUE|REF|Regexp|SCALAR|VSTRING)$/i); |
263
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0
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return ref($self); |
264
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} |
265
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266
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267
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=head2 new |
268
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269
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my $object = Anansi::Example->new(); |
270
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271
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my $object = Anansi::Example->new( |
272
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SETTING => 'example', |
273
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); |
274
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275
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=over 4 |
276
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277
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=item class I<(Blessed Hash B String, Required)> |
278
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279
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Either an object or a string of this namespace. |
280
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281
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=item parameters I<(Hash, Optional)> |
282
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283
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Named parameters. |
284
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285
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=back |
286
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287
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Instantiates an object instance of a module. Calls the |
288
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L module with the supplied I |
289
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after the object is instantiated. Indirectly called via an extending module |
290
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through inheritance. |
291
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292
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=cut |
293
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294
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295
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sub new { |
296
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0
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0
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1
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my ($class, %parameters) = @_; |
297
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0
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0
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return if(ref($class) =~ /^(ARRAY|CODE|FORMAT|GLOB|HASH|IO|LVALUE|REF|Regexp|SCALAR|VSTRING)$/i); |
298
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0
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0
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$class = ref($class) if(ref($class) !~ /^$/); |
299
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0
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|
my $self = { |
300
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NAMESPACE => $class, |
301
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PACKAGE => __PACKAGE__, |
302
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}; |
303
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0
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|
bless($self, $class); |
304
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0
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|
my $objectManager = Anansi::ObjectManager->new(); |
305
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0
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|
$objectManager->register($self); |
306
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0
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|
$self->initialise(%parameters); |
307
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0
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|
return $self; |
308
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} |
309
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310
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311
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=head2 old |
312
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313
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$object->old(); |
314
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315
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=over 4 |
316
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317
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=item self I<(Blessed Hash, Required)> |
318
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319
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An object of this namespace. |
320
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321
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=item parameters I<(Hash, Optional)> |
322
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323
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Named parameters. |
324
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325
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=back |
326
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327
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|
Enables a module instance object to be externally destroyed. |
328
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329
|
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|
=cut |
330
|
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331
|
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332
|
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|
sub old { |
333
|
0
|
|
|
0
|
1
|
|
my ($self, %parameters) = @_; |
334
|
0
|
|
|
|
|
|
$self->DESTROY(); |
335
|
|
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|
} |
336
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337
|
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338
|
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|
=head2 used |
339
|
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340
|
|
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|
|
$object->used('EXAMPLE'); |
341
|
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342
|
|
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|
=over 4 |
343
|
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344
|
|
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|
=item self I<(Blessed Hash, Required)> |
345
|
|
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|
|
346
|
|
|
|
|
|
|
An object of this namespace. |
347
|
|
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|
|
|
|
|
348
|
|
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|
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|
|
=item parameters I<(Array, Optional)> |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
An array of strings containing the names of blessed objects currently in use by |
351
|
|
|
|
|
|
|
this object. |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
=back |
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
Releases a module instance object to enable it to be destroyed. |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
=cut |
358
|
|
|
|
|
|
|
|
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
sub used { |
361
|
0
|
|
|
0
|
1
|
|
my ($self, @parameters) = @_; |
362
|
0
|
|
|
|
|
|
my $objectManager = Anansi::ObjectManager->new(); |
363
|
0
|
|
|
|
|
|
foreach my $key (@parameters) { |
364
|
0
|
0
|
|
|
|
|
next if(!defined($self->{$key})); |
365
|
0
|
0
|
|
|
|
|
next if(!defined($self->{$key}->{Anansi})); |
366
|
0
|
0
|
|
|
|
|
next if(!defined($self->{$key}->{Anansi}->{ObjectManager})); |
367
|
0
|
0
|
|
|
|
|
next if(!defined($self->{$key}->{Anansi}->{ObjectManager}->{IDENTIFICATION})); |
368
|
|
|
|
|
|
|
$objectManager->obsolete( |
369
|
|
|
|
|
|
|
USER => $self, |
370
|
0
|
|
|
|
|
|
USES => $self->{$key}, |
371
|
|
|
|
|
|
|
); |
372
|
0
|
|
|
|
|
|
delete $self->{$key}; |
373
|
|
|
|
|
|
|
} |
374
|
|
|
|
|
|
|
} |
375
|
|
|
|
|
|
|
|
376
|
|
|
|
|
|
|
|
377
|
|
|
|
|
|
|
=head2 uses |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
$object->uses( |
380
|
|
|
|
|
|
|
EXAMPLE => $example, |
381
|
|
|
|
|
|
|
); |
382
|
|
|
|
|
|
|
|
383
|
|
|
|
|
|
|
$object->uses( |
384
|
|
|
|
|
|
|
EXAMPLE => 'Anansi::Example', |
385
|
|
|
|
|
|
|
); |
386
|
|
|
|
|
|
|
$object->{EXAMPLE}->doSomething(); |
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
=over 4 |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
=item self I<(Blessed Hash, Required)> |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
An object of this namespace. |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
=item parameters I<(Hash, Optional)> |
395
|
|
|
|
|
|
|
|
396
|
|
|
|
|
|
|
A hash containing keys that represent the name to associate with the string |
397
|
|
|
|
|
|
|
namespace or object within the associated values. |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
=back |
400
|
|
|
|
|
|
|
|
401
|
|
|
|
|
|
|
Binds module instance objects to the current object to ensure that the objects |
402
|
|
|
|
|
|
|
are not prematurely destroyed. Adds the I to the object namespace. |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
=cut |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
sub uses { |
408
|
0
|
|
|
0
|
1
|
|
my ($self, %parameters) = @_; |
409
|
0
|
|
|
|
|
|
my $objectManager = Anansi::ObjectManager->new(); |
410
|
0
|
|
|
|
|
|
$objectManager->current( |
411
|
|
|
|
|
|
|
USER => $self, |
412
|
|
|
|
|
|
|
USES => [values %parameters], |
413
|
|
|
|
|
|
|
); |
414
|
0
|
|
|
|
|
|
while(my ($key, $value) = each(%parameters)) { |
415
|
0
|
0
|
|
|
|
|
next if(!defined($value->{Anansi})); |
416
|
0
|
0
|
|
|
|
|
next if(!defined($value->{Anansi}->{ObjectManager})); |
417
|
0
|
0
|
|
|
|
|
next if(!defined($value->{Anansi}->{ObjectManager}->{IDENTIFICATION})); |
418
|
0
|
0
|
|
|
|
|
$self->{$key} = $value if(!defined($self->{KEY})); |
419
|
|
|
|
|
|
|
} |
420
|
|
|
|
|
|
|
} |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
|
423
|
|
|
|
|
|
|
=head2 using |
424
|
|
|
|
|
|
|
|
425
|
|
|
|
|
|
|
my $names = $object->using(); |
426
|
|
|
|
|
|
|
foreach my $name (@{$names}) { |
427
|
|
|
|
|
|
|
$object->{$name}->doSomething(); |
428
|
|
|
|
|
|
|
} |
429
|
|
|
|
|
|
|
|
430
|
|
|
|
|
|
|
$object->using('EXAMPLE')->doSomething(); |
431
|
|
|
|
|
|
|
|
432
|
|
|
|
|
|
|
if(1 == $object->using( |
433
|
|
|
|
|
|
|
'EXAMPLE', |
434
|
|
|
|
|
|
|
'ANOTHER', |
435
|
|
|
|
|
|
|
)); |
436
|
|
|
|
|
|
|
|
437
|
|
|
|
|
|
|
=over 4 |
438
|
|
|
|
|
|
|
|
439
|
|
|
|
|
|
|
=item self I<(Blessed Hash, Required)> |
440
|
|
|
|
|
|
|
|
441
|
|
|
|
|
|
|
An object of this namespace. |
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
=item parameters I<(Array B String, Optional)> |
444
|
|
|
|
|
|
|
|
445
|
|
|
|
|
|
|
A string or an array of strings containing the names of blessed objects |
446
|
|
|
|
|
|
|
currently in use by this object. |
447
|
|
|
|
|
|
|
|
448
|
|
|
|
|
|
|
=back |
449
|
|
|
|
|
|
|
|
450
|
|
|
|
|
|
|
Either returns an array of strings containing the names of the blessed objects |
451
|
|
|
|
|
|
|
currently in use by this object or the blessed object represented by the single |
452
|
|
|
|
|
|
|
specified name or whether the specified names represent blessed objects with a |
453
|
|
|
|
|
|
|
B<1> I<(one)> for yes and B<0> I<(zero)> for no. |
454
|
|
|
|
|
|
|
|
455
|
|
|
|
|
|
|
=cut |
456
|
|
|
|
|
|
|
|
457
|
|
|
|
|
|
|
|
458
|
|
|
|
|
|
|
sub using { |
459
|
0
|
|
|
0
|
1
|
|
my ($self, @parameters) = @_; |
460
|
0
|
0
|
|
|
|
|
if(0 == scalar(@parameters)) { |
|
|
0
|
|
|
|
|
|
461
|
|
|
|
|
|
|
} elsif(1 == scalar(@parameters)) { |
462
|
0
|
0
|
|
|
|
|
return if(ref($parameters[0]) !~ /^$/); |
463
|
0
|
0
|
|
|
|
|
return if($parameters[0] =~ /^\s*$/); |
464
|
|
|
|
|
|
|
} else { |
465
|
0
|
|
|
|
|
|
foreach my $parameter (@parameters) { |
466
|
0
|
0
|
|
|
|
|
return 0 if(ref($parameter) !~ /^$/); |
467
|
0
|
0
|
|
|
|
|
return 0 if($parameter =~ /^\s*$/); |
468
|
|
|
|
|
|
|
} |
469
|
|
|
|
|
|
|
} |
470
|
0
|
|
|
|
|
|
my $objectManager = Anansi::ObjectManager->new(); |
471
|
0
|
|
|
|
|
|
my $uses = $objectManager->user($self); |
472
|
0
|
0
|
|
|
|
|
if(defined($uses)) { |
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
473
|
|
|
|
|
|
|
} elsif(0 == scalar(@parameters)) { |
474
|
0
|
|
|
|
|
|
return; |
475
|
|
|
|
|
|
|
} elsif(1 == scalar(@parameters)) { |
476
|
0
|
|
|
|
|
|
return 0; |
477
|
|
|
|
|
|
|
} else { |
478
|
0
|
|
|
|
|
|
return []; |
479
|
|
|
|
|
|
|
} |
480
|
0
|
|
|
|
|
|
my %identifiers = map { $objectManager->identification($_) => 1 } (@{$uses}); |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
481
|
0
|
|
|
|
|
|
my %names; |
482
|
0
|
|
|
|
|
|
foreach my $name (keys(%{$self})) { |
|
0
|
|
|
|
|
|
|
483
|
0
|
0
|
|
|
|
|
next if(ref($self->{$name}) =~ /^(|ARRAY|CODE|FORMAT|GLOB|HASH|IO|LVALUE|REF|Regexp|SCALAR|VSTRING)$/i); |
484
|
0
|
0
|
|
|
|
|
next if(!defined(${$self->{$name}}{Anansi})); |
|
0
|
|
|
|
|
|
|
485
|
0
|
0
|
|
|
|
|
next if(!defined(${${$self->{$name}}{Anansi}}{ObjectManager})); |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
486
|
0
|
0
|
|
|
|
|
next if(!defined(${${${$self->{$name}}{Anansi}}{ObjectManager}}{IDENTIFICATION})); |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
487
|
0
|
0
|
|
|
|
|
next if(!defined($identifiers{${${${$self->{$name}}{Anansi}}{ObjectManager}}{IDENTIFICATION}})); |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
488
|
0
|
|
|
|
|
|
$names{$name} = ${${${$self->{$name}}{Anansi}}{ObjectManager}}{IDENTIFICATION}; |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
489
|
|
|
|
|
|
|
} |
490
|
0
|
0
|
|
|
|
|
if(0 == scalar(@parameters)) { |
|
|
0
|
|
|
|
|
|
491
|
0
|
|
|
|
|
|
return [(keys(%names))]; |
492
|
|
|
|
|
|
|
} elsif(1 == scalar(@parameters)) { |
493
|
0
|
0
|
|
|
|
|
return if(!defined($names{$parameters[0]})); |
494
|
0
|
|
|
|
|
|
return $self->{$parameters[0]}; |
495
|
|
|
|
|
|
|
} |
496
|
0
|
|
|
|
|
|
foreach my $parameter (@parameters) { |
497
|
0
|
0
|
|
|
|
|
return 0 if(!defined($names{$parameter})); |
498
|
|
|
|
|
|
|
} |
499
|
0
|
|
|
|
|
|
return 1; |
500
|
|
|
|
|
|
|
} |
501
|
|
|
|
|
|
|
|
502
|
|
|
|
|
|
|
|
503
|
|
|
|
|
|
|
=head1 NOTES |
504
|
|
|
|
|
|
|
|
505
|
|
|
|
|
|
|
This module is designed to make it simple, easy and quite fast to code your |
506
|
|
|
|
|
|
|
design in perl. If for any reason you feel that it doesn't achieve these goals |
507
|
|
|
|
|
|
|
then please let me know. I am here to help. All constructive criticisms are |
508
|
|
|
|
|
|
|
also welcomed. |
509
|
|
|
|
|
|
|
|
510
|
|
|
|
|
|
|
=cut |
511
|
|
|
|
|
|
|
|
512
|
|
|
|
|
|
|
|
513
|
|
|
|
|
|
|
=head1 AUTHOR |
514
|
|
|
|
|
|
|
|
515
|
|
|
|
|
|
|
Kevin Treleaven treleaven I net> |
516
|
|
|
|
|
|
|
|
517
|
|
|
|
|
|
|
=cut |
518
|
|
|
|
|
|
|
|
519
|
|
|
|
|
|
|
|
520
|
|
|
|
|
|
|
1; |
521
|
|
|
|
|
|
|
|