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package PDL::HDF5::Group;
use Carp;
=head1 NAME
PDL::HDF5::Group - PDL::HDF5 Helper Object representing HDF5 groups.
=head1 DESCRIPTION
This is a helper-object used by PDL::HDF5 to interface with HDF5 format's group objects.
Information on the HDF5 Format can be found
at the NCSA's web site at http://hdf.ncsa.uiuc.edu/ .
=head1 SYNOPSIS
See L<PDL::HDF5>
=head1 MEMBER DATA
=over 1
=item groupID
ID number given to the group by the HDF5 library
=item groupname
Name of the group. (Absolute to the root group '/'. e.g. /maingroup/subgroup)
=item fileID
fileID of the HDF file that owns this group.
=item filename
filename of the HDF file that owns this group
=back
=head1 METHODS
####---------------------------------------------------------
=head2 new
=for ref
PDL::HDF5::Group Constructor - creates new object
B<Usage:>
=for usage
This object will usually be created using the calling format detailed in the L<SYNOPSIS>. The
following syntax is used by the L<PDL::HDF5> object to build the object.
$a = new PDL::HDF5:Group( name => $name, filename => $filename, fileID => $fileID );
Args:
$name Name of the group
$filename Filename that owns this group
$fileID FileID of the file that owns this group
=cut
sub new{
my $type = shift;
my %parms = @_;
my $self = {};
my @DataMembers = qw( name filename fileID );
my %DataMembers;
@DataMembers{ @DataMembers } = @DataMembers; # hash for quick lookup
# check for proper supplied names:
my $varName;
foreach $varName(keys %parms){
unless( defined($DataMembers{$varName})){
carp("Error Calling ".__PACKAGE__." Constuctor\n \'$varName\' not a valid data member\n");
return undef;
}
unless( defined($parms{$varName})){
carp("Error Calling ".__PACKAGE__." Constuctor\n \'$varName\' not supplied\n");
return undef;
}
$self->{$varName} = $parms{$varName};
}
my $fileID = $self->{fileID};
my $filename = $self->{filename};
my $name = $self->{name};
# Turn Error Reporting off for the following, so H5 lib doesn't complain
# if the group isn't found.
PDL::HDF5::H5errorOff();
my $rc = PDL::HDF5::H5Gget_objinfo($fileID, $name,1,0);
PDL::HDF5::H5errorOn();
# See if the group exists:
if( $rc >= 0){
#Group Exists open it:
my $groupID = PDL::HDF5::H5Gopen($fileID, $name);
}
else{ # group didn't exist, create it:
$groupID = PDL::HDF5::H5Gcreate($fileID, $name, 0);
}
# Try Opening the Group First (Assume it already exists)
if($groupID < 0 ){
carp "Error Calling ".__PACKAGE__." Constuctor: Can't open or create group '$name'\n";
return undef;
}
$self->{groupID} = $groupID;
bless $self, $type;
return $self;
}
=head2 DESTROY
=for ref
PDL::HDF5 Desctructor - Closes the HDF5 file
B<Usage:>
=for usage
No Usage. Automatically called
=cut
sub DESTROY {
my $self = shift;
if( H5Gclose($self->{groupID}) < 0){
warn("Error closing HDF5 Group '".$self->{name}."' in file '".$self->{filename}."'\n");
}
}
=head2 attrset
=for ref
Set the value of an attribute(s)
Currently the only attribute types supported are null-terminated strings.
B<Usage:>
=for usage
$group->attrset( 'attr1' => 'attr1Value',
'attr2' => 'attr2 value',
.
.
.
);
Returns undef on failure, 1 on success.
=cut
sub attrset {
my $self = shift;
my %attrs = @_; # get atribute hash
my $groupID = $self->{groupID};
my($key,$value);
my $typeID; # id used for attribute
my $dataspaceID; # id used for the attribute dataspace
my $attrID;
foreach $key( sort keys %attrs){
$value = $attrs{$key};
# Create Null-Terminated String Type
$typeID = PDL::HDF5::H5Tcopy(PDL::HDF5::H5T_C_S1());
PDL::HDF5::H5Tset_size($typeID, length($value)); # make legth of type eaual to length of $value
$dataspaceID = PDL::HDF5::H5Screate_simple(0, 0, 0);
#Note: If a attr already exists, then it will be deleted an re-written
# Delete the attribute first
PDL::HDF5::H5errorOff(); # keep h5 lib from complaining
PDL::HDF5::H5Adelete($groupID, $key);
PDL::HDF5::H5errorOn();
$attrID = PDL::HDF5::H5Acreate($groupID, $key, $typeID, $dataspaceID, PDL::HDF5::H5P_DEFAULT());
if($attrID < 0 ){
carp "Error in ".__PACKAGE__." attrset; Can't create attribute '$key'\n";
PDL::HDF5::H5Sclose($dataspaceID);
PDL::HDF5::H5Tclose($typeID); # Cleanup
return undef;
}
# Write the attribute data.
if( PDL::HDF5::H5Awrite($attrID, $typeID, $value) < 0){
carp "Error in ".__PACKAGE__." attrset; Can't write attribute '$key'\n";
PDL::HDF5::H5Aclose($attrID);
PDL::HDF5::H5Sclose($dataspaceID);
PDL::HDF5::H5Tclose($typeID); # Cleanup
return undef;
}
# Cleanup
PDL::HDF5::H5Aclose($attrID);
PDL::HDF5::H5Sclose($dataspaceID);
PDL::HDF5::H5Tclose($typeID);
}
return 1;
}
1;