init III

Perl OTRS/Kernel/System/ITSMChange/Number/AutoIncrement.pm

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+# --
+# Copyright (C) 2001-2019 OTRS AG, https://otrs.com/
+# --
+# This software comes with ABSOLUTELY NO WARRANTY. For details, see
+# the enclosed file COPYING for license information (GPL). If you
+# did not receive this file, see https://www.gnu.org/licenses/gpl-3.0.txt.
+# --
+
+#
+# Generates auto increment change numbers like ss.... (e. g. 1010138, 1010139, ...)
+# --
+
+package Kernel::System::ITSMChange::Number::AutoIncrement;
+
+use strict;
+use warnings;
+
+use parent qw(Kernel::System::ITSMChange::NumberBase);
+
+our @ObjectDependencies = (
+    'Kernel::Config',
+    'Kernel::System::DB',
+    'Kernel::System::ITSMChange',
+);
+
+sub IsDateBased {
+    return 0;
+}
+
+sub ChangeNumberBuild {
+    my ( $Self, $Offset ) = @_;
+
+    $Offset ||= 0;
+
+    my $BaseCounter = 1;
+    if ( $Self->ChangeNumberCounterIsEmpty() ) {
+        $BaseCounter = $Self->InitialCounterOffsetCalculate();
+    }
+
+    my $Counter = $Self->ChangeNumberCounterAdd(
+        Offset => $BaseCounter + $Offset,
+    );
+
+    return if !$Counter;
+
+    my $ConfigObject = $Kernel::OM->Get('Kernel::Config');
+
+    my $SystemID = $ConfigObject->Get('SystemID');
+    my $MinSize  = $ConfigObject->Get('ITSMChange::NumberGenerator::AutoIncrement::MinCounterSize')
+        || $ConfigObject->Get('ITSMChange::NumberGenerator::MinCounterSize')
+        || 5;
+
+    # Pad change number with leading '0' to length $MinSize (config option).
+    $Counter = sprintf "%.*u", $MinSize, $Counter;
+
+    my $ChangeNumber = $SystemID . $Counter;
+
+    return $ChangeNumber;
+}
+
+#
+# Calculate initial counter value on (migrated) systems that already have changes,
+#   but no counter entries yet.
+#
+sub InitialCounterOffsetCalculate {
+    my ( $Self, %Param ) = @_;
+
+    my $LastChangeNumber = $Self->_GetLastChangeNumber();
+    return 1 if !$LastChangeNumber;
+
+    # If the change number was created by a date based generator, change counter needs to start from 1
+    return 1 if $Self->_LooksLikeDateBasedChangeNumber($LastChangeNumber);
+
+    my $ConfigObject = $Kernel::OM->Get('Kernel::Config');
+    my $SystemID     = $ConfigObject->Get('SystemID');
+
+    # Remove SystemID and leading zeros
+    $LastChangeNumber =~ s{\A $SystemID 0* }{}msx;
+
+    return 1 if !$LastChangeNumber;
+
+    return $LastChangeNumber + 1;
+}
+
+sub _GetLastChangeNumber {
+    my ( $Self, %Param ) = @_;
+
+    my $DBObject = $Kernel::OM->Get('Kernel::System::DB');
+
+    return if !$DBObject->Prepare(
+        SQL => 'SELECT MAX(id) FROM change_item',
+    );
+
+    my $ChangeID;
+    while ( my @Data = $DBObject->FetchrowArray() ) {
+        $ChangeID = $Data[0];
+    }
+
+    return if $ChangeID && $ChangeID == 1;
+
+    my %Change = $Kernel::OM->Get('Kernel::System::ITSMChange')->ChangeGet(
+        ChangeID => $ChangeID,
+        UserID   => 1,
+        LogNo    => 1,
+    );
+
+    return if !%Change;
+    return if !$Change{ChangeNumber};
+
+    return $Change{ChangeNumber};
+}
+
+sub _LooksLikeDateBasedChangeNumber {
+    my ( $Self, $ChangeNumber ) = @_;
+
+    return if !$ChangeNumber;
+
+    my $PossibleDate = substr $ChangeNumber, 0, 8;
+    return if length $PossibleDate != 8;
+
+    # Format possible date as a date string
+    $PossibleDate =~ s{\A (\d{4}) (\d{2}) (\d{2}) \z}{$1-$2-$3 00:00:00}gsmx;
+
+    my $DateTimeObject = $Kernel::OM->Create('Kernel::System::DateTime');
+
+    my $Result = $DateTimeObject->Set( String => $PossibleDate );
+
+    return if !$Result;
+
+    return 1;
+}
+
+1;