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# WebFetch::Data::Record - WebFetch Embedding API data record |
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# |
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# Copyright (c) 2009 Ian Kluft. This program is free software; you can |
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# redistribute it and/or modify it under the terms of the GNU General Public |
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# License Version 3. See http://www.webfetch.org/GPLv3.txt |
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# |
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package WebFetch::Data::Record; |
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use strict; |
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use warnings; |
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use base qw( WebFetch ); |
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# define exceptions/errors |
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use Exception::Class ( |
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'WebFetch::Data::Record::Exception::AutoloadFailure' => { |
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isa => 'WebFetch::TracedException', |
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alias => 'throw_autoload_fail', |
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description => "AUTOLOAD failed to handle function call", |
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}, |
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); |
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# no user-servicable parts beyond this point |
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=head1 NAME |
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WebFetch::Data::Record - Object for management of WebFetch data records/rows |
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=head1 SYNOPSIS |
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C |
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Cmk_field_accessor( $field_name, ... ); |
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$value = $obj-Ebynum( $num ); |
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$value = $obj->fieldname; |
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$obj->fieldname( $value ); |
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> |
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=head1 DESCRIPTION |
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This module provides read-only access to a single record of the WebFetch data. |
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=cut |
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our $AUTOLOAD; |
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# initialization |
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sub init |
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{ |
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my $self = shift; |
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# save parameters |
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$self->{obj} = shift; |
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$self->{num} = shift; |
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$self->{recref} = $self->{obj}{records}[$self->{num}]; |
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# signal WebFetch that Data subclasses do not provide a fetch function |
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$self->{no_fetch} = 1; |
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$self->SUPER::init( @_ ); |
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# make accessor functions |
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my $field; |
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my $class = ref( $self ); |
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foreach $field ( @{$self->{obj}{fields}}) { |
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$class->mk_field_accessor( $field ); |
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} |
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foreach $field ( keys %{$self->{obj}{wk_names}}) { |
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$class->mk_field_accessor( $field ); |
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} |
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return $self; |
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} |
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# shortcut function to top-level WebFetch object data |
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sub data { return $_[0]->{obj}; } |
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=item $value = $obj->bynum( $field_num ); |
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Returns the value of the field located by the field number provided. |
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The first field is numbered 0. |
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=cut |
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# get a field by number |
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sub bynum |
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{ |
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my $self = shift; |
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my $f = shift; |
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WebFetch::debug "bynum $f"; |
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return $self->{recref}[$f]; |
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} |
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=item $value = $obj->byname( $field_name ); |
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Returns the value of the named field. |
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=cut |
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# get a field by name |
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sub byname |
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{ |
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my $self = shift; |
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my $fname = shift; |
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my $obj = $self->{obj}; |
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my $f; |
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WebFetch::debug "byname ".(( defined $fname ) ? $fname : "undef"); |
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( defined $fname ) or return undef; |
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if ( exists $obj->{findex}{$fname}) { |
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$f = $obj->{findex}{$fname}; |
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return $self->{recref}[$f]; |
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} |
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return undef; |
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} |
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=item $class->mk_field_accessor( $field_name, ... ); |
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Creates accessor functions for each field name provided. |
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=cut |
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# make field accessor/mutator functions |
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sub mk_field_accessor |
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{ |
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my $class = shift; |
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my $name; |
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foreach $name ( @_ ) { |
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no strict 'refs'; |
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$class->can( $name ) and next; # skip if function exists! |
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# make a closure which keeps value of $name from this call |
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# keep generic so code can use more than one data type per run |
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*{$class."::".$name} = sub { |
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my $self = shift; |
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my $value = shift; |
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my $obj = $self->{obj}; |
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my $recref = $self->{recref}; |
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my $f; |
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if ( exists $obj->{findex}{$name}) { |
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$f = $obj->{findex}{$name}; |
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if ( defined $value ) { |
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my $tmp = $recref->[$f]; |
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$recref->[$f] = $value; |
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return $tmp; |
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} else { |
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return $recref->[$f]; |
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} |
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} elsif ( exists $obj->{wk_names}{$name}) { |
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my $wk = $obj->{wk_names}{$name}; |
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$f = $obj->{findex}{$wk}; |
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if ( defined $value ) { |
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my $tmp = $recref->[$f]; |
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$recref->[$f] = $value; |
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return $tmp; |
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} else { |
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return $recref->[$f]; |
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} |
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} else { |
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return undef; |
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} |
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}; |
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} |
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} |
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=item accessor functions |
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Accessor functions are created for field names and |
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well-known names as they are defined. |
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So a field named "title" can be accessed by an object method of the same |
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name, like $obj->title . |
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=cut |
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# AUTOLOAD function to provide field accessors/mutators |
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sub AUTOLOAD |
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{ |
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my $self = shift; |
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my $type = ref($self) or throw_autoload_fail "self is not an object"; |
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my $name = $AUTOLOAD; |
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$name =~ s/.*://; # strip fully-qualified portion, just want function |
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# decline all-caps names - reserved for special Perl functions |
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( $name =~ /^[A-Z]+$/ ) and return; |
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WebFetch::debug __PACKAGE__."::AUTOLOAD $name"; |
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if (( exists $self->{obj}{findex}{$name}) |
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or ( exists $self->{obj}{wk_names}{$name})) |
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{ |
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$type->mk_field_accessor( $name ); |
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return $self->$name(@_); |
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} else { |
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throw_autoload_fail "no such function or field $name"; |
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} |
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} |
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1; |
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__END__ |