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129 | .\" ======================================================================== |
130 | .\" |
131 | .IX Title "Template::Base 3" |
132 | .TH Template::Base 3 "2009-05-20" "perl v5.8.7" "User Contributed Perl Documentation" |
133 | .SH "NAME" |
134 | Template::Base \- Base class module implementing common functionality |
135 | .SH "SYNOPSIS" |
136 | .IX Header "SYNOPSIS" |
137 | .Vb 2 |
138 | \& package My::Module; |
139 | \& use base qw( Template::Base ); |
140 | .Ve |
141 | .PP |
142 | .Vb 6 |
143 | \& sub _init { |
144 | \& my ($self, $config) = @_; |
145 | \& $self\->{ doodah } = $config\->{ doodah } |
146 | \& || return $self\->error("No 'doodah' specified"); |
147 | \& return $self; |
148 | \& } |
149 | .Ve |
150 | .PP |
151 | .Vb 1 |
152 | \& package main; |
153 | .Ve |
154 | .PP |
155 | .Vb 2 |
156 | \& my $object = My::Module\->new({ doodah => 'foobar' }) |
157 | \& || die My::Module\->error(); |
158 | .Ve |
159 | .SH "DESCRIPTION" |
160 | .IX Header "DESCRIPTION" |
161 | Base class module which implements a constructor and error reporting |
162 | functionality for various Template Toolkit modules. |
163 | .SH "PUBLIC METHODS" |
164 | .IX Header "PUBLIC METHODS" |
165 | .Sh "new(\e%config)" |
166 | .IX Subsection "new(%config)" |
167 | Constructor method which accepts a reference to a hash array or a list |
168 | of \f(CW\*(C`name => value\*(C'\fR parameters which are folded into a hash. The |
169 | \&\f(CW\*(C`_init()\*(C'\fR method is then called, passing the configuration hash and should |
170 | return true/false to indicate success or failure. A new object reference |
171 | is returned, or undef on error. Any error message raised can be examined |
172 | via the \fIerror()\fR class method or directly via the \f(CW$ERROR\fR package variable |
173 | in the derived class. |
174 | .PP |
175 | .Vb 2 |
176 | \& my $module = My::Module\->new({ ... }) |
177 | \& || die My::Module\->error(), "\en"; |
178 | .Ve |
179 | .PP |
180 | .Vb 2 |
181 | \& my $module = My::Module\->new({ ... }) |
182 | \& || die "constructor error: $My::Module::ERROR\en"; |
183 | .Ve |
184 | .Sh "error($msg, ...)" |
185 | .IX Subsection "error($msg, ...)" |
186 | May be called as an object method to get/set the internal \f(CW\*(C`_ERROR\*(C'\fR member |
187 | or as a class method to get/set the \f(CW$ERROR\fR variable in the derived class's |
188 | package. |
189 | .PP |
190 | .Vb 2 |
191 | \& my $module = My::Module\->new({ ... }) |
192 | \& || die My::Module\->error(), "\en"; |
193 | .Ve |
194 | .PP |
195 | .Vb 2 |
196 | \& $module\->do_something() |
197 | \& || die $module\->error(), "\en"; |
198 | .Ve |
199 | .PP |
200 | When called with parameters (multiple params are concatenated), this |
201 | method will set the relevant variable and return undef. This is most |
202 | often used within object methods to report errors to the caller. |
203 | .PP |
204 | .Vb 1 |
205 | \& package My::Module; |
206 | .Ve |
207 | .PP |
208 | .Vb 2 |
209 | \& sub foobar { |
210 | \& my $self = shift; |
211 | .Ve |
212 | .PP |
213 | .Vb 1 |
214 | \& # some other code... |
215 | .Ve |
216 | .PP |
217 | .Vb 3 |
218 | \& return $self\->error('some kind of error...') |
219 | \& if $some_condition; |
220 | \& } |
221 | .Ve |
222 | .Sh "debug($msg, ...)" |
223 | .IX Subsection "debug($msg, ...)" |
224 | Generates a debugging message by concatenating all arguments |
225 | passed into a string and printing it to \f(CW\*(C`STDERR\*(C'\fR. A prefix is |
226 | added to indicate the module of the caller. |
227 | .PP |
228 | .Vb 1 |
229 | \& package My::Module; |
230 | .Ve |
231 | .PP |
232 | .Vb 2 |
233 | \& sub foobar { |
234 | \& my $self = shift; |
235 | .Ve |
236 | .PP |
237 | .Vb 1 |
238 | \& $self\->debug('called foobar()'); |
239 | .Ve |
240 | .PP |
241 | .Vb 2 |
242 | \& # some other code... |
243 | \& } |
244 | .Ve |
245 | .PP |
246 | When the \f(CW\*(C`foobar()\*(C'\fR method is called, the following message |
247 | is sent to \f(CW\*(C`STDERR\*(C'\fR: |
248 | .PP |
249 | .Vb 1 |
250 | \& [My::Module] called foobar() |
251 | .Ve |
252 | .PP |
253 | Objects can set an internal \f(CW\*(C`DEBUG\*(C'\fR value which the \f(CW\*(C`debug()\*(C'\fR |
254 | method will examine. If this value sets the relevant bits |
255 | to indicate \f(CW\*(C`DEBUG_CALLER\*(C'\fR then the file and line number of |
256 | the caller will be appened to the message. |
257 | .PP |
258 | .Vb 1 |
259 | \& use Template::Constants qw( :debug ); |
260 | .Ve |
261 | .PP |
262 | .Vb 3 |
263 | \& my $module = My::Module\->new({ |
264 | \& DEBUG => DEBUG_SERVICE | DEBUG_CONTEXT | DEBUG_CALLER, |
265 | \& }); |
266 | .Ve |
267 | .PP |
268 | .Vb 1 |
269 | \& $module\->foobar(); |
270 | .Ve |
271 | .PP |
272 | This generates an error message such as: |
273 | .PP |
274 | .Vb 1 |
275 | \& [My::Module] called foobar() at My/Module.pm line 6 |
276 | .Ve |
277 | .Sh "\fImodule_version()\fP" |
278 | .IX Subsection "module_version()" |
279 | Returns the version number for a module, as defined by the \f(CW$VERSION\fR |
280 | package variable. |
281 | .SH "AUTHOR" |
282 | .IX Header "AUTHOR" |
283 | Andy Wardley <abw@wardley.org> <http://wardley.org/> |
284 | .SH "COPYRIGHT" |
285 | .IX Header "COPYRIGHT" |
286 | Copyright (C) 1996\-2007 Andy Wardley. All Rights Reserved. |
287 | .PP |
288 | This module is free software; you can redistribute it and/or |
289 | modify it under the same terms as Perl itself. |
290 | .SH "SEE ALSO" |
291 | .IX Header "SEE ALSO" |
292 | Template |