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## -------------------------------------------------------------------------------- |
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## $Id: Object.pm,v 1.1 2002/12/13 21:46:29 joko Exp $ |
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## -------------------------------------------------------------------------------- |
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## $Log: Object.pm,v $ |
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## Revision 1.1 2002/12/13 21:46:29 joko |
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## + initial check-in |
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## |
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## -------------------------------------------------------------------------------- |
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package DesignPattern::Object; |
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|
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use strict; |
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use warnings; |
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|
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|
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use Data::Dumper; |
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#use Devel::CallerItem; |
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#use Devel::StackTrace; |
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|
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sub new { |
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|
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# the classname in most cases |
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my $classname = shift; |
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|
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# use already blessed reference, if passed in - else use the very classname |
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my $class = ref ($classname) || $classname; |
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|
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# the base for our object - a plain perl hash, which .... |
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my $self = {}; |
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# note: |
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# this makes an instance of an arbitrary perl variable, |
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# the most often used for this purpose is - guess it - the hash, |
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# since it resembles object-properties in a convenient way: |
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# $object->{property} = 'Hello World!'; |
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# if you _do_ care about privacy you might take a look |
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# at CPAN's Tie::SecureHash or Class::Contract ... have fun! |
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|
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# TODO: what about logging in here? inherit from |
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# DesignPattern::Object::Logger for this purpose.... |
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# ... or would this give us (harmful) circular module dependencies??? |
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#$logger->debug( __PACKAGE__ . "->new( @args )" ); # this is not "common"! |
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|
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# remember the caller |
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$self->{'__caller'} = caller; |
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#print Dumper(caller(2)); |
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#exit; |
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|
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# remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize! |
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#my $trace = Devel::StackTrace->new(); |
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#print Dumper($trace); |
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#print Dumper($trace->frame(1)->args()); |
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|
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#print "args: ", $self->{'__caller'}->hasargs(), "\n"; |
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|
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#print Dumper($self); |
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#exit; |
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|
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# argument-handling ... |
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|
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# ... get them ... |
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my @args = (); |
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@_ && (@args = @_); |
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|
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# ... check if we can coerce them into an array (this needs an even number of arguments) |
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my $argcount = $#args + 1; |
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my $fract = $argcount / 2; |
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|
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my $seperate = pop @args if $fract != int($fract); |
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|
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# mixin arguments |
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$self = { @args }; |
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|
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# mixin seperate |
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$self->{'__arg'} = $seperate if $seperate; |
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|
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# ... bless hash into object using classname |
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bless $self, $class; |
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$self->_init() if $self->can('_init'); |
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return $self; |
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} |
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|
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sub _abstract_function { |
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my $self = shift; |
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my $self_classname = ref $self; |
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my $function_name = shift; |
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# was: |
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# $logger->error( __PACKAGE__ . ": function \"$fName\" is an abstract method, please implement it in \"$class\""); |
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# is: |
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die( __PACKAGE__ . ": Function '$function_name' is an abstract method, please implement it in '$self_classname'."); |
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#exit; |
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} |
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