Mungle/Transform/Deep.pm

## ---------------------------------------------------------------------------
##  $Id: Deep.pm,v 1.10 2003/02/20 20:48:00 joko Exp $
## ---------------------------------------------------------------------------
##  $Log: Deep.pm,v $
##  Revision 1.10  2003/02/20 20:48:00  joko
##  - refactored lots of code to Data::Code::Ref
##  + alternative 'deep_copy' implementation
##
##  Revision 1.9  2003/02/18 19:35:56  joko
##  +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
##
##  Revision 1.8  2003/02/09 05:10:56  joko
##  + minor update
##
##  Revision 1.7  2003/01/19 03:26:59  joko
##  + added 'sub deep_copy'  -  refactored from libp
##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'
##
##  Revision 1.6  2002/12/23 11:27:53  jonen
##  + changed behavior WATCH!
##
##  Revision 1.5  2002/12/16 19:57:54  joko
##  + option 'init'
##
##  Revision 1.4  2002/12/05 13:56:49  joko
##  - var_deref
##  + expand - more sophisticated dereferencing with callbacks using Iterate
##
##  Revision 1.3  2002/12/03 05:34:55  joko
##  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
##
##  Revision 1.2  2002/12/01 04:44:07  joko
##  + code from Data::Transform::OO
##
##  Revision 1.1  2002/11/29 04:49:20  joko
##  + initial check-in
##
##  Revision 1.1  2002/10/10 03:26:00  cvsjoko
##  + new
## ---------------------------------------------------------------------------


package Data::Transform::Deep;

use strict;
use warnings;

require Exporter;
our @ISA = qw( Exporter );
our @EXPORT_OK = qw(
  &expand
  &deep_copy
  &merge_to
);


use attributes;
use Data::Dumper;
use Iterate;

use Data::Transform::Encode qw( latin_to_utf8 latin_to_utf8_scalar utf8_to_latin utf8_to_latin_scalar );
use Data::Code::Ref qw( ref_slot );

sub numhash2list {
  my $vref = shift;
  #my $context = shift;
  if (ref $vref eq 'HASH') {
    foreach (keys %{$vref}) {
#      if ((ref $vref->{$_}) =~ m/HASH/) {
          if ((ref $vref->{$_}) =~ m/HASH/) {
            if ($vref->{$_}{0}) {   # might be a numerical-indexed array
              #print "000\n";
              #print "context: $context\n";
              my @arr;
              foreach my $key_numeric (sort keys %{$vref->{$_}}) {
                push @arr, $vref->{$_}{$key_numeric};
              }
              $vref->{$_} = \@arr;
            }
            numhash2list($vref->{$_});
          }
#      } else {
#        #$vref->{$_} = scalar2iso($vref->{$_});
#      }
    }
  }
}


# FIXME: could this be refactored using expand?
# btw: "expand": look at scripts@CPAN (System Administration):
# there is a perl make with perl
sub _var_deref_test {
  my $obj = shift;
  my $options = shift;
  my $result;
  if ((ref $obj) eq 'ARRAY') {
    foreach (@{$obj}) {
      my $ref = ref $_;
      if ($ref) {
        push(@{$result}, var_deref($_, $options));
        #undef $_;
      } else {
        #push(@{$result}, $_);
        push(@{$result}, deep_copy($_));
      }
      #undef $_ if $options->{destroy};
      #$options->{destroy}->($_) if $options->{destroy};
    }
  # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
  } else {
    foreach (keys %{$obj}) {
      my $key = $_;
      my $ref = ref $obj->{$_};
      if ($ref) {
        $result->{$_} = var_deref($obj->{$_}, $options);
        #undef $obj->{$_};
      } else {
        #$result->{$_} = $obj->{$_};
        $result->{$_} = deep_copy($obj->{$_});
      }
      #undef $obj->{$_} if $options->{destroy};
      #$options->{destroy}->($obj->{$_}) if $options->{destroy};
    }
  }
  #undef $obj if $options->{destroy};
  $options->{cb_destroy}->($obj) if $options->{cb_destroy};
  return $result;
}


sub expand {

  my $obj = shift;
  my $options = shift;
  my $result;

  #print "ref: ", ref $obj, "\n";

  if (ref $obj eq 'ARRAY') {

    IterArray @$obj, sub {
      my $item;
      # if current item is a reference ...
      if (ref $_[0]) {
        # ... expand structure recursively
        $item = expand($_[0], $options);
        # destroy item via seperate callback method (a POST) if requested
        #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};

      # ... assume plain scalar
      } else {
        #$item = deep_copy($_[0]);
        $item = $_[0];
        # conversions/encodings
        $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
        $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
      }
      #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)
      push(@{$result}, $item);                 # use item in any case

    }

  } elsif (ref $obj eq 'CODE') {
    #print Dumper($obj);
    #exit;

  # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
  } elsif (ref $obj) {

    IterHash %$obj, sub {
      my $item;
      
      # if current item is a reference ...
      if (ref $_[1]) {
        # ... expand structure recursively
        $item = expand($_[1], $options);
        # destroy item via seperate callback method (a POST) if requested
        #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
      
      # ... assume plain scalar
      } else {
        #$item = deep_copy($_[1]);
        $item = $_[1];
        # conversions/encodings
        $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
        $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
      }
      #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)
      $result->{$_[0]} = $item;               # use item in any case
    }

  } else {
    #die ("not a reference!");
    $result = $obj;

  }

  # convert all values to utf8 (inside complex struct)
    # now done in core-item-callbacks via Greg London's "Iterate" from CPAN
    # var2utf8($result) if ($options->{utf8});

  # destroy persistent object from memory to be sure to get a fresh one next time
  #undef $obj if $options->{destroy};
  #$options->{cb_destroy}->($obj) if $options->{cb_destroy};
  #$options->{cb}->{destroy}->($obj) if $options->{destroy};
  
  return $result;
}


my @indexstack;
sub _var_traverse_mixin_update_old {
  my $obj = shift;
  my $data = shift;
  my $bool_recursion = shift;
  if (!$bool_recursion) {
    @indexstack = ();
  }
  my $result;

  # 'ARRAY' does not work!
  if ((ref $obj) eq 'ARRAY') {
    #print "ARRAY\n";
    my $i = 0;
    foreach (@{$obj}) {
      push @indexstack, $i;
      my $ref = ref $_;
      if ($ref) {
        #$obj->[$i] = var_mixin($_, $data, 1);
        var_traverse_mixin_update($_, $data, 1);
      } else {
        $obj->[$i] = $_;
      }
      pop @indexstack;
      $i++;
    }
  } else {
    foreach (keys %{$obj}) {
      push @indexstack, $_;
      my $ref = ref $obj->{$_};
      if ($ref) {
        #$obj->{$_} = var_mixin($obj->{$_}, $data, 1);
        var_traverse_mixin_update($obj->{$_}, $data, 1);
      } else {
        #$obj->{$_} = $obj->{$_};
        my $evstring = getSlot($data);
        $obj->{$_} = $evstring;
        
      }
      pop @indexstack;
    }
  }
  #return $result;
}

sub merge_to {
  _hash2object(@_);
  # TODO:
  # re-implement using CPAN's "Iterate".
}


# todo: maybe do diff(s) here sometimes!?
sub _hash2object {
  my $object = shift;
  my $data = shift;
  my $options = shift;

  #print "hash2object", "\n";
  
  # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
  # this method corrects this
  numhash2list($data) if ($options->{php});

  # utf8-conversion/-encoding (essential for I18N)
  var_utf2iso($data) if ($options->{utf8});

  # get fresh object from database
  # todo:
  #   - handle "locked" objects !!!
  #   - check if already another update occoured (object-revisioning needed!)
  #my $obj = $self->getObject($oid);

  # mix changes into fresh object and save it back
  _hash2object_traverse_mixin($object, $data, 0, $options);

  # done in core mixin function?
  #$self->{storage}->update($obj);

  # we should "undef" some objects here to destroy them in memory and enforce reloading when used next time
  # simulate:
  #$self->{storage}->disconnect();

}

# ------------------------------------
#   core mixin function
# TODO-FEATURE: make this possible in a reverse way: object is empty (no fields) and gets filled up by mixin-data

# remember keys of structures we are traversing
# this is a HACK:
#  - don't (!!!) "packageglobal" @indexstack
#  - it will lead to problems with parallelism!

#my @indexstack;

# traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object
sub _hash2object_traverse_mixin {
  my $object = shift;
  my $data = shift;
  my $bool_recursion = shift;
  my $options = shift;

  # clear our key - stack if we are called from user-code (non-recursively)
  @indexstack = () if (!$bool_recursion);

  my $classname = ref $object;
#  if ($classname) {
#    print STDERR "*****************", Dumper(Class::Tangram::attribute_types($classname)), "\n";
#  }

  # parser: detected OBJECT (a Tangram one?)   (reftype == HASH) (assume)
  # what's exactly done here? hmmm.... it works ;)
  # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
  # extend! check!
  
  #print attributes::reftype($object), "\n";
  
  # V1
  #if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
  # V2
  my $reftype = attributes::reftype($object);
  #print "reftype: '$reftype'", "\n";
  if ($reftype eq 'HASH') {

#    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
        
    my @fields;
    # loop through fields of object (Tangram-object)
    @fields = keys %{$object};

    # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
    @fields = keys %{$data} if $options->{init};
#    @fields = keys %{$data} if $options->{mixin};
    
    foreach (@fields) {
      my $field = $_;
      push @indexstack, $field;
            
      # determine type of object
      my $ref = ref $object->{$field};
#      print STDERR "attrname: $_  ATTRref: $ref", "\n";
      if ($ref) {
        _hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
      } else {
        my $val = ref_slot($data, \@indexstack);
        
#print Dumper($options);
        my $field_target = $field;
        if (my $pattern = $options->{pattern_strip_key}) {
          print "pattern: $pattern", "\n";
          $field_target =~ s/$pattern//;
          print "field: $field_target", "\n";
        }

        $object->{$field_target} = $val if defined $val;
      }
      pop @indexstack;
    }

    # save object to database ...
    # ... do an update if it already exists, do an insert if it doesn't
#    my $objectId = $self->{storage}->id($obj);
#    $logger->debug( __PACKAGE__ . "->saveObjectFromHash_traverse_mixin_update( object $obj objectId $objectId )" );
#    if ($objectId) {
#      $self->{storage}->update($obj);

#print __PACKAGE__ . ":", "\n";
#print Dumper($object);

#    } else {
#      $self->{storage}->insert($obj);
#    }
    
  }

#&& ( ref($obj) ne 'HASH' ) 

    # loop through entries of array (IntrArray, isn't it?)
  if ((ref $object) eq 'ARRAY') {
#    print STDERR "===", "refttype ", attributes::reftype($obj), "\n";
    my $i = 0;
    foreach (@{$object}) {
      push @indexstack, $i;
      my $ref = ref $_;
#      print STDERR "attrname: $_  ATTRref: $ref", "\n";
#      if ($ref && $_) {
      if ($ref) {
        _hash2object_traverse_mixin($_, $data, 1, $options);
      } else {
        $object->[$i] = $_ if defined $_;
      }
      pop @indexstack;
      $i++;
    }

=pod
  # object?
  } else {
    print "reference: ", ref $object, "\n";
    print "reftype: ", $reftype, "\n";
    die(__PACKAGE__ . "->_hash2object_traverse_mixin: can not handle this!");
=cut
  
  }

}


# ACK's go to Randal L. Schwartz <merlyn@stonehenge.com>
# on the website:
# This text is copyright by Miller-Freeman, Inc., and is used with their permission. 
# Further distribution or use is not permitted. 
# please visit http://www.stonehenge.com/merlyn/UnixReview/col30.html
sub deep_copy1 {
  my $this = shift;
  if (not ref $this) {
    $this;
  } elsif (ref $this eq "ARRAY") {
    [map deep_copy1($_), @$this];
  } elsif (ref $this eq "HASH") {
    +{map { $_ => deep_copy1($this->{$_}) } keys %$this};
  } elsif (ref $this eq "CODE") {
    $this;
  } else { die "deep_copy1 asks: what type is $this?" }
  #} else { print "deep_copy asks: what type is $this?", "\n"; }
}

# ACK's go to Andrew Pitonyak
# Copyright 2002, Andrew Pitonyak (perlboy@pitonyak.org)
# please visit: http://www.pitonyak.org/code/perl/Pitonyak/DeepCopy.pm.html
sub deep_copy {
  Pitonyak::deep_copy(@_);
}

1;
__END__
1	joko	1.7	## ---------------------------------------------------------------------------
2	joko	1.11	## $Id: Deep.pm,v 1.10 2003/02/20 20:48:00 joko Exp $
3	joko	1.7	## ---------------------------------------------------------------------------
4	joko	1.8	## $Log: Deep.pm,v $
5	joko	1.11	## Revision 1.10 2003/02/20 20:48:00 joko
6			## - refactored lots of code to Data::Code::Ref
7			## + alternative 'deep_copy' implementation
8			##
9	joko	1.10	## Revision 1.9 2003/02/18 19:35:56 joko
10			## +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
11			##
12	joko	1.9	## Revision 1.8 2003/02/09 05:10:56 joko
13			## + minor update
14			##
15	joko	1.8	## Revision 1.7 2003/01/19 03:26:59 joko
16			## + added 'sub deep_copy' - refactored from libp
17			## + add 'sub merge' - exported from CPAN's 'Hash::Merge'
18			##
19	joko	1.7	## Revision 1.6 2002/12/23 11:27:53 jonen
20			## + changed behavior WATCH!
21			##
22			## Revision 1.5 2002/12/16 19:57:54 joko
23			## + option 'init'
24			##
25			## Revision 1.4 2002/12/05 13:56:49 joko
26			## - var_deref
27			## + expand - more sophisticated dereferencing with callbacks using Iterate
28			##
29			## Revision 1.3 2002/12/03 05:34:55 joko
30			## + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
31			##
32			## Revision 1.2 2002/12/01 04:44:07 joko
33			## + code from Data::Transform::OO
34			##
35			## Revision 1.1 2002/11/29 04:49:20 joko
36			## + initial check-in
37			##
38			## Revision 1.1 2002/10/10 03:26:00 cvsjoko
39			## + new
40			## ---------------------------------------------------------------------------
41	joko	1.1
42
43			package Data::Transform::Deep;
44
45			use strict;
46			use warnings;
47
48			require Exporter;
49			our @ISA = qw( Exporter );
50	joko	1.2	our @EXPORT_OK = qw(
51	joko	1.4	&expand
52	joko	1.7	&deep_copy
53	joko	1.10	&merge_to
54	joko	1.1	);
55	joko	1.10
56	joko	1.1
57			use attributes;
58	joko	1.2	use Data::Dumper;
59	joko	1.10	use Iterate;
60	joko	1.7
61	joko	1.10	use Data::Transform::Encode qw( latin_to_utf8 latin_to_utf8_scalar utf8_to_latin utf8_to_latin_scalar );
62			use Data::Code::Ref qw( ref_slot );
63	joko	1.1
64	joko	1.10	sub numhash2list {
65	joko	1.1	my $vref = shift;
66			#my $context = shift;
67			if (ref $vref eq 'HASH') {
68			foreach (keys %{$vref}) {
69			# if ((ref $vref->{$_}) =~ m/HASH/) {
70			if ((ref $vref->{$_}) =~ m/HASH/) {
71			if ($vref->{$_}{0}) { # might be a numerical-indexed array
72			#print "000\n";
73			#print "context: $context\n";
74			my @arr;
75			foreach my $key_numeric (sort keys %{$vref->{$_}}) {
76			push @arr, $vref->{$_}{$key_numeric};
77			}
78			$vref->{$_} = \@arr;
79			}
80	joko	1.10	numhash2list($vref->{$_});
81	joko	1.1	}
82			# } else {
83			# #$vref->{$_} = scalar2iso($vref->{$_});
84			# }
85			}
86			}
87			}
88
89
90	joko	1.9	# FIXME: could this be refactored using expand?
91			# btw: "expand": look at scripts@CPAN (System Administration):
92			# there is a perl make with perl
93	joko	1.10	sub _var_deref_test {
94	joko	1.1	my $obj = shift;
95	joko	1.4	my $options = shift;
96	joko	1.1	my $result;
97			if ((ref $obj) eq 'ARRAY') {
98			foreach (@{$obj}) {
99			my $ref = ref $_;
100			if ($ref) {
101	joko	1.4	push(@{$result}, var_deref($_, $options));
102			#undef $_;
103	joko	1.1	} else {
104	joko	1.4	#push(@{$result}, $_);
105			push(@{$result}, deep_copy($_));
106	joko	1.1	}
107	joko	1.4	#undef $_ if $options->{destroy};
108			#$options->{destroy}->($_) if $options->{destroy};
109	joko	1.1	}
110	joko	1.2	# TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }" ???
111	joko	1.1	} else {
112			foreach (keys %{$obj}) {
113			my $key = $_;
114			my $ref = ref $obj->{$_};
115			if ($ref) {
116	joko	1.4	$result->{$_} = var_deref($obj->{$_}, $options);
117			#undef $obj->{$_};
118	joko	1.1	} else {
119	joko	1.4	#$result->{$_} = $obj->{$_};
120			$result->{$_} = deep_copy($obj->{$_});
121	joko	1.1	}
122	joko	1.4	#undef $obj->{$_} if $options->{destroy};
123			#$options->{destroy}->($obj->{$_}) if $options->{destroy};
124	joko	1.1	}
125			}
126	joko	1.4	#undef $obj if $options->{destroy};
127			$options->{cb_destroy}->($obj) if $options->{cb_destroy};
128	joko	1.1	return $result;
129			}
130
131
132	joko	1.4	sub expand {
133
134			my $obj = shift;
135			my $options = shift;
136			my $result;
137
138	joko	1.10	#print "ref: ", ref $obj, "\n";
139
140			if (ref $obj eq 'ARRAY') {
141	joko	1.4
142			IterArray @$obj, sub {
143			my $item;
144			# if current item is a reference ...
145			if (ref $_[0]) {
146			# ... expand structure recursively
147			$item = expand($_[0], $options);
148			# destroy item via seperate callback method (a POST) if requested
149			#$options->{cb}->{destroy}->($_[0]) if $options->{destroy};
150
151			# ... assume plain scalar
152			} else {
153			#$item = deep_copy($_[0]);
154			$item = $_[0];
155			# conversions/encodings
156	joko	1.10	$item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
157			$item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
158	joko	1.4	}
159			#push(@{$result}, $item) if $item; # use item only if not undef (TODO: make configurable via $options)
160			push(@{$result}, $item); # use item in any case
161
162			}
163
164	joko	1.10	} elsif (ref $obj eq 'CODE') {
165			#print Dumper($obj);
166			#exit;
167
168	joko	1.4	# TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }" ???
169	joko	1.10	} elsif (ref $obj) {
170	joko	1.4
171			IterHash %$obj, sub {
172			my $item;
173
174			# if current item is a reference ...
175			if (ref $_[1]) {
176			# ... expand structure recursively
177			$item = expand($_[1], $options);
178			# destroy item via seperate callback method (a POST) if requested
179			#$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
180
181			# ... assume plain scalar
182			} else {
183			#$item = deep_copy($_[1]);
184			$item = $_[1];
185			# conversions/encodings
186	joko	1.10	$item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
187			$item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
188	joko	1.4	}
189			#$result->{$_[0]} = $item if $item; # use item only if not undef (TODO: make configurable via $options)
190			$result->{$_[0]} = $item; # use item in any case
191			}
192
193	joko	1.10	} else {
194			#die ("not a reference!");
195			$result = $obj;
196
197	joko	1.4	}
198
199			# convert all values to utf8 (inside complex struct)
200			# now done in core-item-callbacks via Greg London's "Iterate" from CPAN
201			# var2utf8($result) if ($options->{utf8});
202
203			# destroy persistent object from memory to be sure to get a fresh one next time
204			#undef $obj if $options->{destroy};
205			#$options->{cb_destroy}->($obj) if $options->{cb_destroy};
206			#$options->{cb}->{destroy}->($obj) if $options->{destroy};
207
208			return $result;
209			}
210
211	joko	1.1
212
213			my @indexstack;
214	joko	1.10	sub _var_traverse_mixin_update_old {
215	joko	1.1	my $obj = shift;
216			my $data = shift;
217			my $bool_recursion = shift;
218			if (!$bool_recursion) {
219			@indexstack = ();
220			}
221			my $result;
222
223			# 'ARRAY' does not work!
224			if ((ref $obj) eq 'ARRAY') {
225			#print "ARRAY\n";
226			my $i = 0;
227			foreach (@{$obj}) {
228			push @indexstack, $i;
229			my $ref = ref $_;
230			if ($ref) {
231			#$obj->[$i] = var_mixin($_, $data, 1);
232			var_traverse_mixin_update($_, $data, 1);
233			} else {
234			$obj->[$i] = $_;
235			}
236			pop @indexstack;
237			$i++;
238			}
239			} else {
240			foreach (keys %{$obj}) {
241			push @indexstack, $_;
242			my $ref = ref $obj->{$_};
243			if ($ref) {
244			#$obj->{$_} = var_mixin($obj->{$_}, $data, 1);
245			var_traverse_mixin_update($obj->{$_}, $data, 1);
246			} else {
247			#$obj->{$_} = $obj->{$_};
248			my $evstring = getSlot($data);
249			$obj->{$_} = $evstring;
250
251			}
252			pop @indexstack;
253			}
254			}
255			#return $result;
256			}
257
258	joko	1.10	sub merge_to {
259			_hash2object(@_);
260			# TODO:
261			# re-implement using CPAN's "Iterate".
262	joko	1.2	}
263
264	joko	1.10
265	joko	1.2	# todo: maybe do diff(s) here sometimes!?
266	joko	1.10	sub _hash2object {
267	joko	1.2	my $object = shift;
268			my $data = shift;
269			my $options = shift;
270
271	joko	1.3	#print "hash2object", "\n";
272
273	joko	1.2	# "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
274			# this method corrects this
275	joko	1.10	numhash2list($data) if ($options->{php});
276	joko	1.2
277			# utf8-conversion/-encoding (essential for I18N)
278			var_utf2iso($data) if ($options->{utf8});
279
280			# get fresh object from database
281			# todo:
282			# - handle "locked" objects !!!
283			# - check if already another update occoured (object-revisioning needed!)
284			#my $obj = $self->getObject($oid);
285
286			# mix changes into fresh object and save it back
287	joko	1.10	_hash2object_traverse_mixin($object, $data, 0, $options);
288	joko	1.2
289			# done in core mixin function?
290			#$self->{storage}->update($obj);
291
292			# we should "undef" some objects here to destroy them in memory and enforce reloading when used next time
293			# simulate:
294			#$self->{storage}->disconnect();
295
296			}
297
298			# ------------------------------------
299			# core mixin function
300			# TODO-FEATURE: make this possible in a reverse way: object is empty (no fields) and gets filled up by mixin-data
301
302			# remember keys of structures we are traversing
303			# this is a HACK:
304			# - don't (!!!) "packageglobal" @indexstack
305			# - it will lead to problems with parallelism!
306
307			#my @indexstack;
308
309			# traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object
310	joko	1.10	sub _hash2object_traverse_mixin {
311	joko	1.2	my $object = shift;
312			my $data = shift;
313			my $bool_recursion = shift;
314	joko	1.5	my $options = shift;
315	joko	1.2
316			# clear our key - stack if we are called from user-code (non-recursively)
317			@indexstack = () if (!$bool_recursion);
318
319			my $classname = ref $object;
320			# if ($classname) {
321			# print STDERR "*****************", Dumper(Class::Tangram::attribute_types($classname)), "\n";
322			# }
323
324			# parser: detected OBJECT (a Tangram one?) (reftype == HASH) (assume)
325			# what's exactly done here? hmmm.... it works ;)
326			# maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
327			# extend! check!
328	joko	1.10
329			#print attributes::reftype($object), "\n";
330
331			# V1
332			#if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
333			# V2
334			my $reftype = attributes::reftype($object);
335			#print "reftype: '$reftype'", "\n";
336			if ($reftype eq 'HASH') {
337	joko	1.2
338			# print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
339
340	joko	1.5	my @fields;
341	joko	1.2	# loop through fields of object (Tangram-object)
342	joko	1.5	@fields = keys %{$object};
343
344			# loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
345			@fields = keys %{$data} if $options->{init};
346	jonen	1.6	# @fields = keys %{$data} if $options->{mixin};
347	joko	1.5
348			foreach (@fields) {
349	joko	1.7	my $field = $_;
350			push @indexstack, $field;
351	joko	1.2
352			# determine type of object
353	joko	1.7	my $ref = ref $object->{$field};
354	joko	1.2	# print STDERR "attrname: $_ ATTRref: $ref", "\n";
355			if ($ref) {
356	joko	1.10	_hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
357	joko	1.2	} else {
358	joko	1.10	my $val = ref_slot($data, \@indexstack);
359	joko	1.7
360	joko	1.8	#print Dumper($options);
361	joko	1.7	my $field_target = $field;
362			if (my $pattern = $options->{pattern_strip_key}) {
363			print "pattern: $pattern", "\n";
364			$field_target =~ s/$pattern//;
365			print "field: $field_target", "\n";
366			}
367
368			$object->{$field_target} = $val if defined $val;
369	joko	1.2	}
370			pop @indexstack;
371			}
372
373			# save object to database ...
374			# ... do an update if it already exists, do an insert if it doesn't
375			# my $objectId = $self->{storage}->id($obj);
376			# $logger->debug( __PACKAGE__ . "->saveObjectFromHash_traverse_mixin_update( object $obj objectId $objectId )" );
377			# if ($objectId) {
378			# $self->{storage}->update($obj);
379
380			#print __PACKAGE__ . ":", "\n";
381			#print Dumper($object);
382
383			# } else {
384			# $self->{storage}->insert($obj);
385			# }
386
387			}
388
389			#&& ( ref($obj) ne 'HASH' )
390
391			# loop through entries of array (IntrArray, isn't it?)
392			if ((ref $object) eq 'ARRAY') {
393			# print STDERR "===", "refttype ", attributes::reftype($obj), "\n";
394			my $i = 0;
395			foreach (@{$object}) {
396			push @indexstack, $i;
397			my $ref = ref $_;
398			# print STDERR "attrname: $_ ATTRref: $ref", "\n";
399	jonen	1.6	# if ($ref && $_) {
400			if ($ref) {
401	joko	1.10	_hash2object_traverse_mixin($_, $data, 1, $options);
402	joko	1.2	} else {
403	jonen	1.6	$object->[$i] = $_ if defined $_;
404	joko	1.2	}
405			pop @indexstack;
406			$i++;
407			}
408	joko	1.10
409			=pod
410			# object?
411			} else {
412			print "reference: ", ref $object, "\n";
413			print "reftype: ", $reftype, "\n";
414			die(__PACKAGE__ . "->_hash2object_traverse_mixin: can not handle this!");
415			=cut
416
417	joko	1.2	}
418
419			}
420
421
422	joko	1.10	# ACK's go to Randal L. Schwartz <merlyn@stonehenge.com>
423			# on the website:
424			# This text is copyright by Miller-Freeman, Inc., and is used with their permission.
425			# Further distribution or use is not permitted.
426			# please visit http://www.stonehenge.com/merlyn/UnixReview/col30.html
427			sub deep_copy1 {
428			my $this = shift;
429			if (not ref $this) {
430			$this;
431			} elsif (ref $this eq "ARRAY") {
432			[map deep_copy1($_), @$this];
433			} elsif (ref $this eq "HASH") {
434			+{map { $_ => deep_copy1($this->{$_}) } keys %$this};
435			} elsif (ref $this eq "CODE") {
436			$this;
437			} else { die "deep_copy1 asks: what type is $this?" }
438			#} else { print "deep_copy asks: what type is $this?", "\n"; }
439	joko	1.2	}
440
441	joko	1.10	# ACK's go to Andrew Pitonyak
442			# Copyright 2002, Andrew Pitonyak (perlboy@pitonyak.org)
443			# please visit: http://www.pitonyak.org/code/perl/Pitonyak/DeepCopy.pm.html
444	joko	1.7	sub deep_copy {
445	joko	1.11	Pitonyak::deep_copy(@_);
446	joko	1.1	}
447
448			1;
449	joko	1.10	__END__
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