/[cvs]/nfo/perl/libs/DesignPattern/Object.pm
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revision 1.2 by joko, Fri Dec 27 16:05:42 2002 UTC revision 1.3 by joko, Mon Jan 20 16:54:22 2003 UTC
# Line 1  Line 1 
1  ## --------------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
2  ##  $Id$  ##  $Id$
3  ## --------------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
4  ##  $Log$  ##  $Log$
5    ##  Revision 1.3  2003/01/20 16:54:22  joko
6    ##  + sub fromPackage: refactored from libp's 'getNewPerlObjFromPkgName' or s.th.l.th.
7    ##
8  ##  Revision 1.2  2002/12/27 16:05:42  joko  ##  Revision 1.2  2002/12/27 16:05:42  joko
9  ##  + played with Devel::CallerItem and Devel::StackTrace  ##  + played with Devel::CallerItem and Devel::StackTrace
10  ##  ##
11  ##  Revision 1.1  2002/12/13 21:46:29  joko  ##  Revision 1.1  2002/12/13 21:46:29  joko
12  ##  + initial check-in  ##  + initial check-in
13  ##  ##
14  ## --------------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
15    
16    
17  package DesignPattern::Object;  package DesignPattern::Object;
# Line 21  use Data::Dumper; Line 24  use Data::Dumper;
24  #use Devel::CallerItem;  #use Devel::CallerItem;
25  #use Devel::StackTrace;  #use Devel::StackTrace;
26    
27    
28    # get logger instance
29    my $logger = Log::Dispatch::Config->instance;
30    
31  sub new {  sub new {
32        
33    # the classname in most cases    # the classname in most cases
# Line 29  sub new { Line 36  sub new {
36    # use already blessed reference, if passed in - else use the very classname    # use already blessed reference, if passed in - else use the very classname
37    my $class = ref ($classname) || $classname;    my $class = ref ($classname) || $classname;
38        
39      $logger->debug( "$classname->new( ... )" . "\t[via " . __PACKAGE__ . "]" );
40      
41    # the base for our object - a plain perl hash, which ....    # the base for our object - a plain perl hash, which ....
42    my $self = {};    my $self = {};
43    # note:    # note:
# Line 44  sub new { Line 53  sub new {
53    # ... or would this give us (harmful) circular module dependencies???    # ... or would this give us (harmful) circular module dependencies???
54    #$logger->debug( __PACKAGE__ . "->new( @args )" );      # this is not "common"!    #$logger->debug( __PACKAGE__ . "->new( @args )" );      # this is not "common"!
55    
   # remember the caller  
     $self->{'__caller'} = caller;  
     #print Dumper(caller(2));  
     #exit;  
56            
57    # remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize!    # remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize!
58    #my $trace = Devel::StackTrace->new();    #my $trace = Devel::StackTrace->new();
# Line 59  sub new { Line 64  sub new {
64    #print Dumper($self);    #print Dumper($self);
65    #exit;    #exit;
66    
67    
68    # argument-handling ...    # argument-handling ...
69    
70      # ... get them ...      # ... get them ...
# Line 79  sub new { Line 85  sub new {
85    
86    # ... bless hash into object using classname    # ... bless hash into object using classname
87    bless $self, $class;    bless $self, $class;
88    
89      # remember the caller
90        $self->{'__caller'} = caller;
91        #print Dumper(caller(2));
92        #exit;
93    
94      $self->{__classname} = $classname;
95    
96    $self->_init() if $self->can('_init');    $self->_init() if $self->can('_init');
97    
98    return $self;    return $self;
99  }    }  
100    
# Line 88  sub _abstract_function { Line 103  sub _abstract_function {
103    my $self_classname = ref $self;    my $self_classname = ref $self;
104    my $function_name = shift;    my $function_name = shift;
105    # was:    # was:
106    # $logger->error( __PACKAGE__ . ": function \"$fName\" is an abstract method, please implement it in \"$class\"");    $logger->warning( __PACKAGE__ . ": function '$function_name' is an abstract method, please implement it in '$self_classname'.");
107    # is:    # is:
108    die( __PACKAGE__ . ": Function '$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'.");
109    #exit;    #exit;
110  }  }
111    
112    sub fromPackage {
113      my $self = shift;
114      #my $self_classname = ref $self;
115      my $pkgname = shift;
116      my @args = @_;
117    #  my $args = shift;
118    
119    #      my $caller = $self->{'__caller'};
120    
121    #print Dumper($args);
122    
123      $logger->debug( __PACKAGE__ . "->fromPackage( pkgname $pkgname args @args )" );
124      
125      # perl-load
126        my $evstring = "use $pkgname;";
127        eval($evstring);
128      
129      # report errors
130        if ($@) {
131          # build error-messages
132          my $errmsg_native = __PACKAGE__ . ':' . __LINE__ . " Error in eval \"$evstring\": " .  $@;
133          #my $classname = $self->{__classname};
134          my $errmsg_critical = '';
135          if ($errmsg_native =~ m/Can't locate (.+?) in \@INC/) {
136            $errmsg_critical = "Could not instantiate object from package '$pkgname' - location of '$1' failed.";
137          } else {
138            $errmsg_critical = $errmsg_native;
139          }
140          # write error to logging-output (console|file|database)
141          $logger->debug( $errmsg_native );
142          $logger->critical( $errmsg_critical );
143          return;
144        }
145      
146      # object-creation
147        my $object = $pkgname->new(@args);
148    
149      # run boot-methods on object
150        $object->_init() if $object->can('_init');
151    
152      return $object;
153    }
154    
155  1;  1;
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