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package Plucene::Document::DateSerializer; |
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use strict; |
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use warnings; |
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use Time::Piece; |
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use base 'Exporter'; |
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our @EXPORT = qw(freeze_date); |
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=head1 NAME |
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Plucene::Document::DateSerializer - Utility functions for dealing with dates |
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=head1 SYNOPSIS |
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use Plucene::Document::DateSerializer |
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my $field = Plucene::Document::Field->Text( |
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date => freeze_date(Time::Piece $t) |
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); |
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$doc->add($field); |
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=head1 DESCRIPTION |
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Dates and times in Plucene should be serialized using the C |
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function so that the L can filter on them |
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during future searches. |
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=head1 SUBROUTINES |
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=head2 freeze_date |
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my $string = freeze_date(Time::Piece $t) |
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This routine, exported by default, turns a C object into |
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a string in a format expected by both Plucene and Lucene. |
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=cut |
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sub freeze_date { _to_base_36(shift->epoch * 1000); } |
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sub _to_base_36 { |
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my $number = shift; |
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my $string = ""; |
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while ($number) { |
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my $quot = $number % 36; |
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$string = ($quot < 10 ? $quot : chr($quot + 87)) . $string; |
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$number = int($number / 36); |
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} |
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$string = "0$string" while length($string) < 9; |
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$string; |
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} |
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sub _from_base_36 { |
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my $string = shift; |
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my $exponent = 0; |
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my $number; |
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for (reverse split //, $string) { |
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$number += ($_ =~ /\d/ ? $_ : (ord($_) - 87)) * (36**$exponent++); |
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} |
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return $number; |
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} |
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# Java uses milliseconds, but Perl doesn't have 'em |
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=head2 thaw_date |
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my Time::Piece $t = Plucene::Document::DateSerializer::thaw_date($string) |
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This routine is not exported, and is not used by the Plucene core. It is |
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useful for debugging dates, and simply reverses the C operation. |
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=cut |
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sub thaw_date { |
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my $self = shift; |
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return Time::Piece->new(_from_base_36($self) / 1000); |
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} |
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1; |