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Added proxying by alternate criteria to WobjectProxy

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This commit is contained in:
Len Kranendonk 2004-07-22 18:51:07 +00:00
parent d7171e5d49
commit 02d24c4e4c
13 changed files with 515 additions and 31 deletions
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133
lib/WebGUI/MetaData.pm
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@ -18,6 +18,7 @@ package WebGUI::MetaData;
use strict;
use WebGUI::Session;
use WebGUI::SQL;
use WebGUI::Macro;
use Tie::IxHash;
=head1 NAME
@ -42,8 +43,9 @@ These functions/methods are available from this package:
#-------------------------------------------------------------------
=head2 getFieldTypes ( )
=head2 getFieldTypes ()
Returns an array ref with supported metadata field types.
@ -164,6 +166,8 @@ sub getMetaDataFields {
Saves posted metadata for requested wobjectId
=over
=item wobjectId
The Id from the wobject you want to save metadata for.
@ -203,6 +207,8 @@ sub metaDataSave {
Deletes the metadata for requested wobjectId
=over
=item wobjectId
The Id from the wobject you want to delete metadata for.
@ -222,6 +228,8 @@ sub metaDataDelete {
Duplicates Metadata
=over
=item fromWobjectId
The original wobject Id
@ -246,5 +254,128 @@ sub MetaDataDuplicate {
}
#-------------------------------------------------------------------
=head2 getWobjectByCriteria ( hashRef )
This function will search for a wobject that match a metadata criteria set.
If no wobject is found, undef will be returned.
=over
=item hashRef
A typical hashRef for this function will look like:
{
proxiedNamespace => "Article",
resolveMultiples => "random",
proxyCriteria => "State = Wisconsin AND Country != Sauk"
}
Most of the time this will be a:
WebGUI::SQL->quickHashRef("select * from WobjectProxy where wobjectId=$proxiedId");
=back
=cut
sub getWobjectByCriteria {
my $wobjectProxy = shift;
my $criteria = $wobjectProxy->{proxyCriteria};
my $order = $wobjectProxy->{resolveMultiples};
my $namespace = $wobjectProxy->{proxiedNamespace};
my $wobjectId = $wobjectProxy->{wobjectId};
# Once a wobject is found, we will stick to that wobject,
# to prevent the proxying of multiple- depth wobjects like Surveys and USS.
my $scratchId;
if ($wobjectId) {
$scratchId = "WobjectProxy_" . $wobjectId;
if($session{scratch}{$scratchId}) {
return $session{scratch}{$scratchId};
}
}
# $criteria = "State = Wisconsin AND Country != Sauk";
#
# State = Wisconsin AND Country != Sauk
# | | |
# |- $field |_ $operator |- $value
# |_ $attribute |_ $attribute
my $operator = qr/<>|!=|=|>=|<=|>|<|like/i;
my $attribute = qr/['"][^()|=><!]+['"]|[^()|=><!\s]+/i;
my $constraint = $criteria;
# Get each expression from $criteria
foreach my $expression ($criteria =~ /($attribute\s*$operator\s*$attribute)/gi) {
# $expression will match "State = Wisconsin"
my $replacement = $expression; # We don't want to modify $expression.
# We need it later.
# Get the field (State) and the value (Wisconsin) from the $expression.
$expression =~ /($attribute)\s*$operator\s*($attribute)/gi;
my $field = $1;
my $value = $2;
# quote the field / value variables.
my $quotedField = $field;
unless ($field =~ /^\s*['"].*['"]\s*/) {
$quotedField = quote($field);
}
my $quotedValue = WebGUI::Macro::process($value);
unless ($value =~ /^\s*['"].*['"]\s*/) {
$quotedValue = quote($value);
}
# transform replacement from "State = Wisconsin" to
# "(fieldname=State and value = Wisconsin)"
$replacement =~ s/\Q$field/(fieldname=$quotedField and value /;
$replacement =~ s/\Q$value/$quotedValue )/i;
# replace $expression with the new $replacement in $constraint.
$constraint =~ s/\Q$expression/$replacement/;
}
my $sql = " select w.wobjectId
from metaData_data d, metaData_fields f, wobject w
where f.fieldId = d.fieldId
and w.wobjectId = d.wobjectId
and w.namespace = ".quote($namespace);
# Add constraint only if it has been modified.
$sql .= " and ".$constraint if (($constraint ne $criteria) && $constraint ne "");
$sql .= " order by w.lastEdited desc";
# Execute the query with an unconditional read
my @wids;
my $sth = WebGUI::SQL->unconditionalRead($sql);
while (my ($data) = $sth->array) {
push (@wids, $data);
}
$sth->finish;
# No matching wobjects found.
if (scalar(@wids) == 0) {
return undef;
}
my $wid;
# Grab a wid from the results
if ($order = 'random') {
$wid = $wids[ rand @wids ];
} else {
#default order is mostRecent
$wid = $wids[0]; # 1st element in list is most recent.
}
# Store the matching wobjectId in user scratch.
WebGUI::Session::setScratch($scratchId,$wid) if ($scratchId);
return $wid;
}
1;