Storage/Schema/Abstract.pm

###############################################
#
#  $Id: Abstract.pm,v 1.2 2002/10/25 11:45:10 joko Exp $
#
#  $Log: Abstract.pm,v $
#  Revision 1.2  2002/10/25 11:45:10  joko
#  + enhanced robustness
#  + more logging for debug-levels
#
#  Revision 1.1  2002/10/17 00:07:14  joko
#  + new
#
#
###############################################
                       
# ====================================
package Data::Storage::Schema::Abstract;

  use strict;
  use warnings;
  
  use Tangram;
  use Class::Tangram;
  
  use Tangram::RawDate;
  use Tangram::RawTime;
  use Tangram::RawDateTime;
  
  use Tangram::FlatArray;
  use Tangram::FlatHash;
  use Tangram::PerlDump;
  
  # get logger instance
  my $logger = Log::Dispatch::Config->instance;


# ========   object constructor - %args to $self  ========
  sub new {
    my $invocant = shift;
    my $class = ref($invocant) || $invocant;
    my @args = ();
    @_ && (@args = @_);
    
    #my $self = { @_ };

    # merge all entries from all hashes in args-array to single array (key, val, key, val)
    my @args_all = ();
    map { push(@args_all, %{$_}); } @args;
    # make hash from array
    my %args = @args_all;

    $logger->debug( __PACKAGE__ . "->new( @args_all )" );
    
    my $self = { %args };
    bless $self, $class;

    # remember as which Class we are instantiated
    $self->{invocant} = $invocant;

    $self->_checkClassTangram();
    $self->_init();
    
    return $self;
  }
  
  sub _checkClassTangram {
    my $self = shift;
    # check version of "Class::Tangram"
    my $ctversion = $Class::Tangram::VERSION;
    #print "ctversion: ", $ctversion, "\n";
    #if ($ctversion ne 1.04) {
    if ($ctversion lt 1.13) {
      print "Version of \"Class::Tangram\": ", $ctversion, "\n";
      print "minimum required version   : ", "1.13", "\n";
      #print "quitting!!! (please install older version (1.04) of \"Class::Tangram\"", "\n";
      exit;
    }
  }

  sub _parsePackageNamesFromFile {
    my $self = shift;
    my $filename = shift;
    my $exclude_pattern = shift;
    $logger->debug( __PACKAGE__ . "->_parsePackageFile( ... )" );
    if (!$filename) {
      $logger->error( __PACKAGE__ . "->_parsePackageFile: you must specify a filename" );
      return;
    }
    if (! -e $filename) {
      $logger->error( __PACKAGE__ . "->_parsePackageFile: could not find $filename" );
    }
    my @packages = ();
    open(FH, '<' . $filename);
    while (<FH>) {
      chomp();
      my $good = 1;
      $exclude_pattern && ($good = !m/$exclude_pattern/);
      push @packages, $1 if m/^package (.+?);/ && $good;
    }
    close(FH);
    return \@packages;
  }

  sub _doinit {
    my $self = shift;
    
    $logger->debug( __PACKAGE__ . "->_doinit()" );

    # WHAT?
    # imports classes to Tangram-Schema in this style, but in an abstracted way:
    #     Class::Tangram::import_schema("SystemEvent");
    # TODO:
    # move this code to Data::Storage::Schema::Tangram

    # TODO:
    # two cases:
    # 1. use a given list of strings as to-be-used-object-names
    # 2. parse the content of the given package and use all declared Perl Packages as objects
    
    my $classlist = $self->{EXPORT_OBJECTS};
    
    # parse complete package to build list of classes
    if ($#{$classlist} == -1) {
      $logger->debug( "_doinit() Initializing all Classes from " . $self->{invocant} );
      if (!$self->{invocant}->can('getFilename')) {
        $logger->error( __PACKAGE__ . "->_doinit: Package $self->{invocant} doesn't contain method 'getFilename'" );
        return;
      }
      my $perl_packagefile = eval('return ' . $self->{invocant} . '::getFilename();');
      my $packages = $self->_parsePackageNamesFromFile($perl_packagefile, $self->{invocant});
      # TODO:
      # cache list so this routine isn't called on every startup/request
      $classlist = $packages;
    }
    
    # build argument to be passed to "Tangram::Schema->new(...)"
    my @classes;
    map {
      $logger->debug( __PACKAGE__ . "->_doinit: Initializing Class $_" );
      # classname
      push @classes, $_;
      # schema
      my $schema;
      my $evalstr = '$schema = $' . $_ . '::schema;';
      my $res = eval($evalstr);
      push @classes, $schema;
    } @{$classlist};

    # create a new Tangram schema object
    # these classes must occour in the same order used at a previous setup
    $self->{schema} = Tangram::Schema->new({ classes => \@classes });    
    return 1;
    
    # ======================================
    # template
    $self->{schema} = Tangram::Schema->new({ 
        classes => [ 
    
          # misc
            'SystemEvent' => $SystemEvent::schema,
    
        ],
      });
    # ======================================


  }
  
  sub _init {
    my $self = shift;
    if (!$self->{schema}) {
      $self->_doinit();
    }
  }

  # return schema
  sub getSchema {
    my $self = shift;
    if (!$self->{schema}) {
      #print "schema is not yet initialized!", "\n";
      #exit;
      $logger->error( __PACKAGE__ . "->getSchema: Schema is not yet initialized!" );
      return;
    }
    return $self->{schema};
  }


1;
1	joko	1.1	###############################################
2			#
3	joko	1.3	# $Id: Abstract.pm,v 1.2 2002/10/25 11:45:10 joko Exp $
4	joko	1.2	#
5			# $Log: Abstract.pm,v $
6	joko	1.3	# Revision 1.2 2002/10/25 11:45:10 joko
7			# + enhanced robustness
8			# + more logging for debug-levels
9			#
10	joko	1.2	# Revision 1.1 2002/10/17 00:07:14 joko
11			# + new
12	joko	1.1	#
13			#
14			###############################################
15
16			# ====================================
17			package Data::Storage::Schema::Abstract;
18
19			use strict;
20			use warnings;
21
22			use Tangram;
23			use Class::Tangram;
24
25			use Tangram::RawDate;
26			use Tangram::RawTime;
27			use Tangram::RawDateTime;
28
29			use Tangram::FlatArray;
30			use Tangram::FlatHash;
31			use Tangram::PerlDump;
32
33			# get logger instance
34			my $logger = Log::Dispatch::Config->instance;
35
36
37			# ======== object constructor - %args to $self ========
38			sub new {
39			my $invocant = shift;
40			my $class = ref($invocant) \|\| $invocant;
41			my @args = ();
42			@_ && (@args = @_);
43	joko	1.2
44	joko	1.1	#my $self = { @_ };
45
46			# merge all entries from all hashes in args-array to single array (key, val, key, val)
47			my @args_all = ();
48			map { push(@args_all, %{$_}); } @args;
49			# make hash from array
50			my %args = @args_all;
51	joko	1.2
52			$logger->debug( __PACKAGE__ . "->new( @args_all )" );
53	joko	1.1
54			my $self = { %args };
55			bless $self, $class;
56
57			# remember as which Class we are instantiated
58			$self->{invocant} = $invocant;
59
60			$self->_checkClassTangram();
61			$self->_init();
62
63			return $self;
64			}
65
66			sub _checkClassTangram {
67			my $self = shift;
68			# check version of "Class::Tangram"
69			my $ctversion = $Class::Tangram::VERSION;
70			#print "ctversion: ", $ctversion, "\n";
71			#if ($ctversion ne 1.04) {
72	joko	1.3	if ($ctversion lt 1.13) {
73	joko	1.1	print "Version of \"Class::Tangram\": ", $ctversion, "\n";
74	joko	1.3	print "minimum required version : ", "1.13", "\n";
75	joko	1.1	#print "quitting!!! (please install older version (1.04) of \"Class::Tangram\"", "\n";
76			exit;
77			}
78			}
79
80			sub _parsePackageNamesFromFile {
81			my $self = shift;
82			my $filename = shift;
83			my $exclude_pattern = shift;
84			$logger->debug( __PACKAGE__ . "->_parsePackageFile( ... )" );
85	joko	1.2	if (!$filename) {
86			$logger->error( __PACKAGE__ . "->_parsePackageFile: you must specify a filename" );
87			return;
88			}
89			if (! -e $filename) {
90			$logger->error( __PACKAGE__ . "->_parsePackageFile: could not find $filename" );
91			}
92	joko	1.1	my @packages = ();
93			open(FH, '<' . $filename);
94			while (<FH>) {
95			chomp();
96			my $good = 1;
97			$exclude_pattern && ($good = !m/$exclude_pattern/);
98			push @packages, $1 if m/^package (.+?);/ && $good;
99			}
100			close(FH);
101			return \@packages;
102			}
103
104			sub _doinit {
105			my $self = shift;
106
107			$logger->debug( __PACKAGE__ . "->_doinit()" );
108
109			# WHAT?
110			# imports classes to Tangram-Schema in this style, but in an abstracted way:
111			# Class::Tangram::import_schema("SystemEvent");
112			# TODO:
113			# move this code to Data::Storage::Schema::Tangram
114
115			# TODO:
116			# two cases:
117			# 1. use a given list of strings as to-be-used-object-names
118			# 2. parse the content of the given package and use all declared Perl Packages as objects
119
120			my $classlist = $self->{EXPORT_OBJECTS};
121
122			# parse complete package to build list of classes
123			if ($#{$classlist} == -1) {
124			$logger->debug( "_doinit() Initializing all Classes from " . $self->{invocant} );
125	joko	1.2	if (!$self->{invocant}->can('getFilename')) {
126			$logger->error( __PACKAGE__ . "->_doinit: Package $self->{invocant} doesn't contain method 'getFilename'" );
127			return;
128			}
129	joko	1.1	my $perl_packagefile = eval('return ' . $self->{invocant} . '::getFilename();');
130			my $packages = $self->_parsePackageNamesFromFile($perl_packagefile, $self->{invocant});
131			# TODO:
132			# cache list so this routine isn't called on every startup/request
133			$classlist = $packages;
134			}
135
136			# build argument to be passed to "Tangram::Schema->new(...)"
137			my @classes;
138			map {
139	joko	1.2	$logger->debug( __PACKAGE__ . "->_doinit: Initializing Class $_" );
140	joko	1.1	# classname
141			push @classes, $_;
142			# schema
143			my $schema;
144			my $evalstr = '$schema = $' . $_ . '::schema;';
145			my $res = eval($evalstr);
146			push @classes, $schema;
147			} @{$classlist};
148
149			# create a new Tangram schema object
150			# these classes must occour in the same order used at a previous setup
151			$self->{schema} = Tangram::Schema->new({ classes => \@classes });
152			return 1;
153
154			# ======================================
155			# template
156			$self->{schema} = Tangram::Schema->new({
157			classes => [
158
159			# misc
160			'SystemEvent' => $SystemEvent::schema,
161
162			],
163			});
164			# ======================================
165
166
167			}
168
169			sub _init {
170			my $self = shift;
171			if (!$self->{schema}) {
172			$self->_doinit();
173			}
174			}
175
176			# return schema
177			sub getSchema {
178			my $self = shift;
179			if (!$self->{schema}) {
180	joko	1.2	#print "schema is not yet initialized!", "\n";
181			#exit;
182			$logger->error( __PACKAGE__ . "->getSchema: Schema is not yet initialized!" );
183			return;
184	joko	1.1	}
185			return $self->{schema};
186			}
187
188
189			1;
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