/[cvs]/nfo/perl/libs/DesignPattern/Object.pm
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revision 1.1 by joko, Fri Dec 13 21:46:29 2002 UTC revision 1.5 by joko, Sun Feb 9 16:24:46 2003 UTC
# Line 1  Line 1 
1  ## --------------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
2  ##  $Id$  ##  $Id$
3  ## --------------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
4  ##  $Log$  ##  $Log$
5    ##  Revision 1.5  2003/02/09 16:24:46  joko
6    ##  + pseudo constructor mechanism by calling method 'constructor' on object instantiation
7    ##
8    ##  Revision 1.4  2003/01/22 17:56:49  root
9    ##  + fix: just use the logger if it's available
10    ##
11    ##  Revision 1.3  2003/01/20 16:54:22  joko
12    ##  + sub fromPackage: refactored from libp's 'getNewPerlObjFromPkgName' or s.th.l.th.
13    ##
14    ##  Revision 1.2  2002/12/27 16:05:42  joko
15    ##  + played with Devel::CallerItem and Devel::StackTrace
16    ##
17  ##  Revision 1.1  2002/12/13 21:46:29  joko  ##  Revision 1.1  2002/12/13 21:46:29  joko
18  ##  + initial check-in  ##  + initial check-in
19  ##  ##
20  ## --------------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
21    
22    
23  package DesignPattern::Object;  package DesignPattern::Object;
# Line 13  package DesignPattern::Object; Line 25  package DesignPattern::Object;
25  use strict;  use strict;
26  use warnings;  use warnings;
27    
28    
29    use Data::Dumper;
30    #use Devel::CallerItem;
31    #use Devel::StackTrace;
32    
33    
34    # get logger instance
35    my $logger = eval { Log::Dispatch::Config->instance; };
36    
37    sub new {
38      
39      # the classname in most cases
40      my $classname = shift;
41      
42      # use already blessed reference, if passed in - else use the very classname
43      my $class = ref ($classname) || $classname;
44      
45      $logger->debug( "$classname->new( ... )" . "\t[via " . __PACKAGE__ . "]" ) if $logger;
46      
47      # the base for our object - a plain perl hash, which ....
48      my $self = {};
49      # note:
50      # this makes an instance of an arbitrary perl variable,
51      # the most often used for this purpose is - guess it - the hash,
52      # since it resembles object-properties in a convenient way:
53      #   $object->{property} = 'Hello World!';
54      # if you _do_ care about privacy you might take a look
55      # at CPAN's Tie::SecureHash or Class::Contract ...   have fun!
56      
57      # TODO: what about logging in here? inherit from
58      # DesignPattern::Object::Logger for this purpose....
59      # ... or would this give us (harmful) circular module dependencies???
60      #$logger->debug( __PACKAGE__ . "->new( @args )" );      # this is not "common"!
61    
62        
63      # remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize!
64      #my $trace = Devel::StackTrace->new();
65      #print Dumper($trace);
66      #print Dumper($trace->frame(1)->args());
67    
68    #print "args: ", $self->{'__caller'}->hasargs(), "\n";
69    
70      #print Dumper($self);
71      #exit;
72    
73    
74      # argument-handling ...
75    
76        # ... get them ...
77        my @args = ();
78        @_ && (@args = @_);
79        
80        # ... check if we can coerce them into an array (this needs an even number of arguments)
81      my $argcount = $#args + 1;
82      my $fract = $argcount / 2;
83      
84      my $seperate = pop @args if $fract != int($fract);
85    
86      # mixin arguments
87      $self = { @args };
88      
89      # mixin seperate
90      $self->{'__arg'} = $seperate if $seperate;
91    
92      # ... bless hash into object using classname
93      bless $self, $class;
94    
95      # remember the caller
96        $self->{'__caller'} = caller;
97        #print Dumper(caller(2));
98        #exit;
99    
100      $self->{__classname} = $classname;
101    
102      $self->_init() if $self->can('_init');
103      $self->constructor() if $self->can('constructor');
104    
105      return $self;
106    }  
107    
108  sub _abstract_function {  sub _abstract_function {
109    my $self = shift;    my $self = shift;
110    my $self_classname = ref $self;    my $self_classname = ref $self;
111    my $function_name = shift;    my $function_name = shift;
112    # was:    # was:
113    # $logger->error( __PACKAGE__ . ": function \"$fName\" is an abstract method, please implement it in \"$class\"");    $logger->warning( __PACKAGE__ . ": function '$function_name' is an abstract method, please implement it in '$self_classname'.");
114    # is:    # is:
115    die( __PACKAGE__ . ": Function '$function_name' is an abstract method, please implement it in '$self_classname'.");    #die( __PACKAGE__ . ": Function '$function_name' is an abstract method, please implement it in '$self_classname'.");
116    #exit;    #exit;
117  }  }
118    
119    sub fromPackage {
120      my $self = shift;
121      #my $self_classname = ref $self;
122      my $pkgname = shift;
123      my @args = @_;
124    #  my $args = shift;
125    
126    #      my $caller = $self->{'__caller'};
127    
128    #print Dumper($args);
129    
130      $logger->debug( __PACKAGE__ . "->fromPackage( pkgname $pkgname args @args )" );
131      
132      # perl-load
133        my $evstring = "use $pkgname;";
134        eval($evstring);
135      
136      # report errors
137        if ($@) {
138          # build error-messages
139          my $errmsg_native = __PACKAGE__ . ':' . __LINE__ . " Error in eval \"$evstring\": " .  $@;
140          #my $classname = $self->{__classname};
141          my $errmsg_critical = '';
142          if ($errmsg_native =~ m/Can't locate (.+?) in \@INC/) {
143            $errmsg_critical = "Could not instantiate object from package '$pkgname' - location of '$1' failed.";
144          } else {
145            $errmsg_critical = $errmsg_native;
146          }
147          # write error to logging-output (console|file|database)
148          $logger->debug( $errmsg_native );
149          $logger->critical( $errmsg_critical );
150          return;
151        }
152      
153      # object-creation
154        my $object = $pkgname->new(@args);
155    
156      # run boot-methods on object
157        $object->_init() if $object->can('_init');
158        $object->constructor() if $object->can('constructor');
159    
160      return $object;
161    }
162    
163  1;  1;
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