--- loncom/xml/lontable.pm 2008/11/25 12:27:34 1.2
+++ loncom/xml/lontable.pm 2011/04/05 10:02:58 1.16
@@ -1,7 +1,7 @@
# The LearningOnline Network with CAPA
# Generating TeX tables.
#
-# $Id: lontable.pm,v 1.2 2008/11/25 12:27:34 foxr Exp $
+# $Id: lontable.pm,v 1.16 2011/04/05 10:02:58 foxr Exp $
#
#
# Copyright Michigan State University Board of Trustees
@@ -38,8 +38,8 @@
#
# This module is a support packkage that helps londefdef generate
-# LaTeX tables using the LaTeX::Table package. A prerequisite is that
-# the print generator must have added the following to the LaTeX header:
+# LaTeX tables using the Apache::lonlatextable package. A prerequisite is that
+# the print generator must have added the following to the LaTeX
#
# \usepackage{xtab}
# \usepackage{booktabs}
@@ -55,15 +55,17 @@
package Apache::lontable;
use strict;
-use LaTeX::Table;
+use Apache::lonlatextable;
+use Apache::lonnet; # for trace logging.
+my $tracing = 0; # Set to 1 to enable log tracing. 2 for local sub tracing.
=pod
=head1 lontable Table generation assistant for the LaTeX target
This module contains support software for generating tables in LaTeX output mode
-In this implementation, we use the LaTeX::Table package to do the actual final formatting.
+In this implementation, we use the Apache::lonlatextable package to do the actual final formatting.
Each table creates a new object. Table objects can have global properties configured.
The main operations on a table object are:
@@ -77,11 +79,6 @@ Opens a new table row.
Closes a table row.
-=item start_header
-
-Starts a new row that has the header attribute (e.g. <th> tagged row).
-header rows are ended with an end_row just like any ordinary row.
-
=item configure_row
Modifies a configuration item in the currently open row.
@@ -94,6 +91,10 @@ Returns the generated table string.
Configures a table's global configuration.
+=item add_cell
+
+Add and configure a cell to the current row.6
+
=back
=cut
@@ -109,6 +110,7 @@ modified by this. These configuration i
=over3
+
=item alignment
Table alignment. Some table styles support this but not all.
@@ -129,10 +131,17 @@ The table caption text.
The theme of the table to use. Defaults to Zurich. Themes we know about are:
NYC, NYC2, Zurich, Berlin, Dresden, Houston, Miami, plain, Paris. Other themes can be added
-to the LaTeX::Table package, and they will become supported automatically, as theme names are
-not error checked. Any use of a non-existent theme is reported by the LaTeX::Table package
+to the Apache::lonlatextable package, and they will become supported automatically, as theme names are
+not error checked. Any use of a non-existent theme is reported by the Apache::lonlatextable package
when the table text is generated.
+=item width
+
+The width of the table. in any
+TeX unit measure e.g. 10.8cm This forces the table to the
+tabularx environment. It also forces the declarations for
+cells to be paragraph mode which supports more internal formatting.
+
=back
=head3 Member data
@@ -165,6 +174,11 @@ Table caption (configurable).
Theme desired (configurable).
+=item width
+
+If defined, the width of the table (should be supplied
+in fraction of column width e.g. .75 for 75%.
+
=item row_open
True if a row is open and not yet closed.
@@ -181,21 +195,20 @@ Each row of table data is an element of
=over 3
-=item is_header
-
-True if the user wants to format this row like a header. This row will be used to generate
-the table header. All header rows will be gathered together into the table header. If there
-are multiple table headers interspersed with non table header data, this can lead to some
-surprises.
=item default_halign
-
+0
Default horizontal alignment for cells in this row.
=item default_valign
Default vertical alignment for cells in this row (may be ignored).
+=item cell_width
+
+The width of the row in cells. This is the sum of the column spans
+of the cells in the row.
+
=item cells
Array of hashes where each element represents the data for a cell.
@@ -203,6 +216,11 @@ The contents of each element of this has
=over 3
+=item header
+
+If present, the row is a 'header' that is it was made via the
+<th> tag.
+
=item halign
If present, overrides the row default horizontal alignment.
@@ -220,6 +238,10 @@ If present, indicates the number of rows
If present indicates the number of columns this cell spans.
Note that a cell can span both rows and columns.
+=item start_col
+
+The starting column of the cell in the table grid.
+
=item contents
The contents of the cell.
@@ -233,6 +255,7 @@ The contents of the cell.
sub new {
my ($class, $configuration) = @_;
+
# Initialize the object member data with the default values
# then override with any stuff in $configuration.
@@ -241,10 +264,11 @@ sub new {
outer_border => 0,
inner_border => 0,
caption => "",
- theme => "Zurich",
+ theme => "plain",
column_count => 0,
row_open => 0,
rows => [],
+ col_widths => {}
};
foreach my $key (keys %$configuration) {
@@ -256,6 +280,7 @@ sub new {
return $self;
}
+
#-------------------------------------------------------------------------
#
# Methods that get/set table global configuration.
@@ -278,10 +303,12 @@ Regardless, the current alignment is use
sub alignment {
my ($self, $new_value) = @_;
+ if ($tracing) {&Apache::lonnet::logthis("alignment = $new_value");}
+
if (defined($new_value)) {
- $self->{alignment} = $new_value;
+ $self->{'alignment'} = $new_value;
}
- return $self->{alignment};
+ return $self->{'alignment'};
}
=pod
@@ -303,10 +330,12 @@ the final value of the outer_border requ
sub table_border {
my ($self, $new_value) = @_;
+ if ($tracing) {&Apache::lonnet::logthis("table_border $new_value");}
+
if (defined($new_value)) {
- $self->{outer_border} = $new_value;
+ $self->{'outer_border'} = $new_value;
}
- return $self->{outer_border};
+ return $self->{'outer_border'};
}
@@ -318,21 +347,35 @@ Set or get the presence of a request for
drawn around them. If a paramter is passed, it will be treated as
a new value for the cell border configuration. Regardless,the final
value of that configuration parameter is returned.
+Valid values for the parameter are:
+
+=over 2
+
+=item 0 - no borders present.
+
+=item 1 - All borders (borders around all four sides of the cell.
+
+=item 2 - Border at top and bottom of the cell.
+
+=item 3 - Border at the left and right sides of the cell.
+
+
+=over -2
=head3 Examples:
- my $cell_borders = $table->cell_border(); # ask if cell borders are requested.
+ my $cell_border = $table->cell_border(); # ask if cell borders are requested.
$table->cell_border(1); # Request cell borders.
=cut
-sub cell_borders {
+sub cell_border {
my ($self, $new_value) = @_;
-
+ if($tracing) {&Apache::lonnet::logthis("cell_border: $new_value"); }
if (defined($new_value)) {
- $self->{inner_border} = $new_value;
+ $self->{'inner_border'} = $new_value;
}
- reurn $self->{inner_border};
+ return $self->{'inner_border'};
}
=pod
@@ -353,11 +396,12 @@ the table. If a parameter is supplied i
sub caption {
my ($self, $new_value) = @_;
+ if($tracing) {&Apache::lonnet::logthis("caption: $new_value"); }
if (defined($new_value)) {
- $self->catpion = $new_value;
+ $self->{'caption'} = $new_value;
}
- return $self->caption;
+ return $self->{'caption'};
}
=pod
@@ -377,11 +421,32 @@ will be the new theme selection.
sub theme {
my ($self, $new_value) = @_;
+ if($tracing) {&Apache::lonnet::logthis("theme $new_value"); }
+ if (defined($new_value)) {
+ $self->{'theme'} = $new_value;
+ }
+ return $self->{'theme'};
+}
+
+=pod
+
+=head 2 width
+
+Gets and optionally sets the width of the table.
+
+=head 3 Examples:
+
+ my $newwidth = $table->width("10cm"); # 10cm width returns "10cm".
+
+=cut
+sub width {
+ my ($self, $new_value) = @_;
+ if($tracing) {&Apache::lonnet::logthis("width = $new_value"); }
if (defined($new_value)) {
- $self->theme = $new_value;
+ $self->{'width'} = $new_value;
}
- return $self->theme;
+ return $self->{'width'}; # Could be undef.
}
=pod
@@ -413,30 +478,31 @@ The default vertical alignment of the ro
=cut
sub start_row {
- my ($self, %config) = @_;
-
- if ($self->row_open) {
- $self->end_row;
+ my ($self, $config) = @_;
+ if($tracing) {&Apache::lonnet::logthis("start_row"); }
+ if ($self->{'row_open'}) {
+ $self->end_row();
}
my $row_hash = {
- is_header => 0,
default_halign => "left",
default_valign => "top",
+ cell_width => 0,
cells => []
};
# Override the defaults if the config hash is present:
- if (defined(%config)) {
- foreach my $key (keys %config) {
- $row_hash->{$key} = $config{$key};
+ if (defined($config)) {
+ foreach my $key (keys %$config) {
+ $row_hash->{$key} = $config->{$key};
}
}
+
- my $rows = $self->{rows};
+ my $rows = $self->{'rows'};
push(@$rows, $row_hash);
- $self->row_open = 1; # Row is now open and ready for business.
+ $self->{"row_open"} = 1; # Row is now open and ready for business.
}
=pod
@@ -447,50 +513,543 @@ Closes off a row. Once closed, cells ca
=head3 Examples:
- $table->close_row();
+ $table->end_row();
=cut
-sub close_row {
+sub end_row {
my ($self) = @_;
-
- if ($self->row_open) {
+ if($tracing) {&Apache::lonnet::logthis("end_row"); }
+ if ($self->{'row_open'}) {
# Mostly we need to determine if this row has the maximum
# cell count of any row in existence in the table:
- my $row = $self->{rows}[-1];
- my $cells = $row->{cells};
- my $cell_count = scalar(@$cells);
- if ($cell_count > $self->{column_count}) {
- $self->{column_count} = $cell_count;
+ my $row = $self->{'rows'}->[-1];
+ my $cells = $row->{'cells'};
+
+ if ($row->{'cell_width'} > $self->{'column_count'}) {
+ $self->{'column_count'} = $row->{'cell_width'};
+ }
+
+ $self->{'row_open'} = 0;;
+ }
+}
+
+=pod
+
+=head2 configure_row
+
+Modify the configuration of a row. If a row is not open, a new one will be opened.
+
+=head3 Parameters:
+
+config_hash - A hash that contains new values for the set of row confiuguration
+items to be modified. There is currently no check/penalty for items that are not in
+the set of defined configuration properties which are:
+
+=over 2
+
+=item default_halign
+
+The default horizontal alignment for text in cells in the row. This can be any of:
+"left", "right" or "center".
+
+=item default_valign
+
+The default vertical alignment for text in cells in the row. This can be any of:
+
+"top", "bottom" or "center"
+
+
+=back
+
+=cut
+
+sub configure_row {
+ my ($self, $config) = @_;
+ if($tracing) {&Apache::lonnet::logthis("configure_row");}
+ if (!$self->{'row_open'}) {
+ $self->start_row();
+ }
+
+ my $row = $self->{'rows'}[-1];
+ foreach my $config_item (keys %$config) {
+ $row->{$config_item} = $config->{$config_item};
+ }
+}
+
+
+=pod
+
+=head2 add_cell
+
+Add a new cell to a row. If there is a row above us, we need to
+watch out for row spans that may force additional blank cell entries
+to fill in the span.
+
+=head3 Parameters:
+
+=over 2
+
+=item text
+
+Text to put in the cell.
+
+=item cell_config
+
+Hash of configuration options that override the defaults. The recognized options,
+and their defaults are:
+
+=over 2
+
+=item halign
+
+If nonblank overrides the row's default for the cell's horizontal alignment.
+
+=item valign
+
+If nonblank, overrides the row's default for the cdell's vertical alignment.
+
+=item rowspan
+
+Number of rows the cell spans.
+
+=item colspan
+
+Number of columns the cell spans.
+
+=item width
+
+LaTeX specification of the width of the cell.
+Note that if there is a colspan this width is going to be equally divided
+over the widths of the columnsn in the span.
+Note as well that if width specification conflict, the last one specified wins...silently.
+
+=back
+
+=cut
+
+sub add_cell {
+ my ($self, $text, $config) = @_;
+
+ if($tracing) {&Apache::lonnet::logthis("add_cell : $text"); }
+
+ # If a row is not open, we must open it:
+
+ if (!$self->{'row_open'}) {
+ $self->start_row();
+ }
+ my $rows = $self->{'rows'};
+ my $current_row = $rows->[-1];
+ my $current_cells = $current_row->{'cells'};
+ my $last_coord = $current_row->{'cell_width'};
+
+ # We have to worry about row spans if there is a prior row:
+
+ if (scalar(@$rows) > 1) {
+
+ my $last_row = $rows->[-2];
+ if ($last_coord < $last_row->{'cell_width'}) {
+ my $prior_coord = 0;
+ my $prior_cell_index = 0;
+ while ($prior_coord <= $last_coord) {
+
+ # Pull a cell down if it's coord matches our start coord
+ # And there's a row span > 1.
+ # Having done so, we adjust our $last_coord to match the
+ # end point of the pulled down cell.
+
+ my $prior_cell = $last_row->{'cells'}->[$prior_cell_index];
+ if (!defined($prior_cell)) {
+ last;
+ }
+ if (($prior_cell->{'start_col'} == $last_coord) &&
+ ($prior_cell->{'rowspan'} > 1)) {
+
+ # Need to drop the cell down
+
+ my %dropped_down_cell = %$prior_cell;
+ $dropped_down_cell{'rowspan'}--;
+ $dropped_down_cell{'contents'} = '';
+
+ push(@$current_cells, \%dropped_down_cell);
+ $last_coord += $dropped_down_cell{'colspan'};
+ $current_row->{'cell_width'} = $last_coord;
+
+ }
+ $prior_coord += $prior_cell->{'colspan'};
+ $prior_cell_index++;
+ }
+ }
+
+ }
+
+ #
+ # Now we're ready to build up our cell:
+
+ my $cell = {
+ rowspan => 1,
+ colspan => 1,
+ start_col => $last_coord,
+ contents => $text
+ };
+
+ if (defined($config)) {
+ foreach my $key (keys(%$config)) {
+ if ($key eq 'colspan') {
+ next if ($config->{$key} == 0);
+ }
+ $cell->{$key} = $config->{$key};
}
+ }
+
+ $current_row->{'cell_width'} += $cell->{'colspan'};
+
- $self->row_closed;
+ #
+ # Process the width if it exists. If supplied it must be of the form:
+ # float units
+ # Where units can be in, cm or mm.
+ # Regardless of the supplied units we will normalize to cm.
+ # This allows computation on units at final table generation time.
+ #
+
+ if (exists($cell->{'width'})) {
+ my $width;
+ my $widthcm;
+ $width = $config->{'width'};
+ $widthcm = $self->size_to_cm($width);
+
+ # If there's a column span, the actual width is divided by the span
+ # and applied to each of the columns in the span.
+
+ $widthcm = $widthcm / $cell->{'colspan'};
+ for (my $i = $last_coord; $i < $last_coord + $cell->{'colspan'}; $i++) {
+ $self->{'col_widths'}->{$i} = $widthcm;
+ }
+
}
+
+ push(@$current_cells, $cell);
+
+ if ($tracing) { &Apache::lonnet::logthis("add_cell done"); }
}
+
=pod
-=head2 start_header
+=head2 append_cell_text
+
+Sometimes it's necessary to create/configure the cell and then later add text to it.
+This sub allows text to be appended to the most recently created cell.
+
+=head3 Parameters
+
+The text to add to the cell.
+
+=cut
+sub append_cell_text {
+ my ($this, $text) = @_;
+
+ if($tracing) {&Apache::lonnet::logthis("append_cell_text: $text"); }
+ my $rows = $this->{'rows'};
+ my $current_row = $rows->[-1];
+ my $cells = $current_row->{'cells'};
+ my $current_cell = $cells->[-1];
+ $current_cell->{'contents'} .= $text;
+
+}
+
+
+=pod
-Starts a row that is a header. This is the same as start_row,but the is_header flag
-is set to true.
+=head2 generate
+Call this when the structures for the table have been built.
+This will generate and return the table object that can be used
+to generate the table. Returning the table object allows for
+a certain amount of testing to be done on the generated table.
+The caller can then ask the table object to generate LaTeX.
=cut
+sub generate {
+ my ($this) = @_;
+ my $useP = 0;
+
+ my $colunits = 'cm'; # All widths get normalized to cm.
+ my $tablewidth;
+
+ if($tracing) {&Apache::lonnet::logthis("generate"); }
+ my $table = Apache::lonlatextable->new();
+
-sub start_header {
- my ($self, %config) = @_;
+ # Add the caption if supplied.
+
+ if ($this->{'caption'} ne "") {
+ $table->set_caption($this->caption);
+ }
+
+ # Set the width if defined:
+
+ my $default_width;
+ my $colwidths = $this->{'col_widths'};
+ if (defined ($this->{'width'})) {
+ $tablewidth = $this->{'width'};
+ $tablewidth = $this->size_to_cm($tablewidth);
+
+ $useP = 1;
+
+ # Figure out the default width for a column with unspecified
+ # We take the initially specified widths and sum them up.
+ # This is subtracted from total width above.
+ # If the result is negative we're going to allow a minimum of 2.54cm for
+ # each column and make the table spill appropriately.
+ # This (like a riot) is an ugly thing but I'm open to suggestions about
+ # how to handle it better (e.g. scaling down requested widths?).
+
+ my $specified_width = 0.0;
+ my $specified_cols = 0;
+ foreach my $col (keys %$colwidths) {
+ $specified_width = $specified_width + $colwidths->{$col};
+ $specified_cols++;
+ }
+ my $unspecified_cols = $this->{'column_count'} - $specified_cols;
+
+ # If zero unspecified cols, we are pretty much done... just have to
+ # adjust the total width to be specified width. Otherwise we
+ # must figure out the default width and total width:
+ #
+ my $total_width;
+ if($unspecified_cols == 0) {
+ $total_width = $specified_width;
+ } else {
+ $default_width = ($tablewidth - $specified_width)/$unspecified_cols; # Could be negative....
+ $total_width = $default_width * $unspecified_cols + $specified_width;
+ }
+
+ # if the default_width is < 0.0 the user has oversubscribed the width of the table with the individual
+ # column. In this case, we're going to maintain the desired proportions of the user's columns, but
+ # ensure that the unspecified columns get a fair share of the width..where a fair share is defined as
+ # the total width of the table / unspecified column count.
+ # We figure out what this means in terms of reducing the specified widths by dividing by a constant proportionality.
+ # Note that this cannot happen if the user hasn't specified anywidths as the computation above would then
+ # just make all columns equal fractions of the total table width.
+
+ if ($default_width < 0) {
+ $default_width = ($tablewidth/$unspecified_cols); # 'fair' default width.
+ my $width_remaining = $tablewidth - $default_width*$unspecified_cols; # What's left for the specified cols.
+ my $reduction = $tablewidth/$width_remaining; # Reduction fraction for specified cols
+ foreach my $col (keys %$colwidths) {
+ $colwidths->{$col} = $colwidths->{$col}/$reduction;
+ }
+
+ }
+ }
+
+
+
+
+ # Build up the data:
+
+ my @data;
+ my $rows = $this->{'rows'};
+ my $row_count = scalar(@$rows);
+ my $inner_border = $this->{'inner_border'};
+ my $outer_border = $this->{'outer_border'};
+ my $column_count = $this->{'column_count'};
+
+ my $cell_ul_border = (($inner_border == 1) || ($inner_border == 2)) ? 1 : 0;
+ my $cell_lr_border = (($inner_border == 1) || ($inner_border == 3)) ? 1 : 0;
+
+ # Add a top line if the outer or inner border is enabled:
+
+ if ($outer_border || $cell_ul_border) {
+ push(@data, ["\\cline{1-$column_count}"]);
+
+ }
+
+ for (my $row = 0; $row < $row_count; $row++) {
+ my @row;
+ my $cells = $rows->[$row]->{'cells'};
+ my $def_halign = $rows->[$row]->{'default_halign'};
+ my $cell_count = scalar(@$cells);
+ my $startcol = 1;
+ my @underlines; # Array of \cline cells if cellborder on.
+
+
+
+ for (my $cell = 0; $cell < $cell_count; $cell++) {
+ my $contents = $cells->[$cell]->{'contents'};
+
+ #
+ # Cell alignment is the default alignment unless
+ # explicitly specified in the cell.
+ # NOTE: at this point I don't know how to do vert alignment.
+ #
+
+ my $halign = $def_halign;
+ if (defined ($cells->[$cell]->{'halign'})) {
+ $halign = $cells->[$cell]->{'halign'};
+ }
+
+ # Create the horizontal alignment character:
+
+ my $col_align = 'l';
+ my $embeddedAlignStart = "";
+ my $embeddedAlignEnd = "";
+
+ if ($halign eq 'right') {
+ $col_align = 'r';
+ $embeddedAlignStart = '\raggedleft';
+ }
+ if ($halign eq 'center') {
+ $col_align = 'c';
+ $embeddedAlignStart = '\begin{center}';
+ $embeddedAlignEnd = '\end{center}';
+ }
+
+ # If the width has been specified, turn these into
+ # para mode; and wrap the contents in the start/stop stuff:
+
+ if ($useP) {
+ my $cw;
+ if (defined($colwidths->{$cell})) {
+ $cw = $colwidths->{$cell};
+ } else {
+ $cw = $default_width;
+ }
+ $cw = $cw * $cells->[$cell]->{'colspan'};
+ $col_align = "p{$cw $colunits}";
+ $contents = $embeddedAlignStart . $contents . $embeddedAlignEnd;
+ }
+
+ if ($cell_lr_border || ($outer_border && ($cell == 0))) {
+ $col_align = '|'.$col_align;
+ }
+ if ($cell_lr_border || ($outer_border && ($cell == ($cell_count -1)))) {
+ $col_align = $col_align.'|';
+ }
+
+ #factor in spans:
+
+ my $cspan = $cells->[$cell]->{'colspan'};
+ my $nextcol = $startcol + $cspan;
+
+ # If we can avoid the \multicolumn directive that's best as
+ # that makes some things like \parpic invalid in LaTeX which
+ # screws everything up.
+
+ if (($cspan > 1) || !($col_align =~ /l/)) {
+
+ $contents = '\multicolumn{'.$cspan.'}{'.$col_align.'}{'.$contents.'}';
+
+ # A nasty edge case. If there's only one cell, the software will assume
+ # we're in complete control of the row so we need to end the row ourselves.
+
+ if ($cell_count == 1) {
+ $contents .= ' \\\\';
+ }
+ }
+ if ($cell_ul_border && ($cells->[$cell]->{'rowspan'} == 1)) {
+ my $lastcol = $nextcol -1;
+ push(@underlines, "\\cline{$startcol-$lastcol}");
+ }
+ $startcol = $nextcol;
+ # Rowspans should take care of themselves.
+
+ push(@row, $contents);
+
+ }
+ push(@data, \@row);
+ if ($cell_ul_border) {
+ for (my $i =0; $i < scalar(@underlines); $i++) {
+ push(@data, [$underlines[$i]]);
+ }
+ }
+
+ }
+ #
+ # Add bottom border if necessary: if the inner border was on, the loops above
+ # will have done a bottom line under the last cell.
+ #
+ if ($outer_border && !$cell_ul_border) {
+ push(@data, ["\\cline{1-$column_count}"]);
+
+ }
+ $table->set_data(\@data);
+
+ my $coldef = "";
+ if ($outer_border || $cell_lr_border) {
+ $coldef .= '|';
+ }
+ for (my $i =0; $i < $column_count; $i++) {
+ if ($useP) {
+ $coldef .= "p{$default_width $colunits}";
+ } else {
+ $coldef .= 'l';
+ }
+ if ($cell_lr_border ||
+ ($outer_border && ($i == $column_count-1))) {
+ $coldef .= '|';
+ }
+ }
+ $table->{'coldef'} = $coldef;
+
+ # Return the table:
+
+ if ($tracing) { &Apache::lonnet::logthis("Leaving generate"); }
+
+
+ return $table;
- $self->start_row(%config);
- $self->{rows}[-1]->is_header = 1;
}
+#---------------------------------------------------------------------------
+#
+# Private methods:
+#
+#
+# Convert size with units -> size in cm.
+# The resulting size is floating point with no units so that it can be used in
+# computation. Note that an illegal or missing unit is treated silently as
+# cm for now.
+#
+sub size_to_cm {
+ my ($this, $size_spec) = @_;
+ my ($size, $units) = split(/ /, $size_spec);
+ if (lc($units) eq 'mm') {
+ return $size / 10.0;
+ }
+ if (lc($units) eq 'in') {
+ return $size * 2.54;
+ }
+
+ return $size; # Default is cm.
+}
+#----------------------------------------------------------------------------
+# The following methods allow for testability.
+sub get_object_attribute {
+ my ($self, $attribute) = @_;
+ if ($tracing > 1) { &Apache::lonnet::logthis("get_object_attribute: $attribute"); }
+ return $self->{$attribute};
+}
+
+sub get_row {
+ my ($self, $row) = @_;
+ if ($tracing > 1) { &Apache::lonnet::logthis("get_row"); }
+
+ my $rows = $self->{'rows'}; # ref to an array....
+ return $rows->[$row]; # ref to the row hash for the selected row.
+}
+
# Mandatory initialization.
+BEGIN{
+}
1;
__END__
+