Report Layout and Design - JasperReports for Java Developers - page 135

Attribute Description Valid Values Default Value

System : The variable value is a
custom calculation.
Variance : The variable
value is the variance of all
non-null values matching the
report expression.

incrementer
FactoryClass

Determines the
class used to
calculate the value
of the variable
when filling the
current record on
the report.

Any class implementing
net.sf.jasperreports.
engine.fill .
JRIncrementerFactory

N/A

incrementType None

Determines when
to recalculate
the value of the
variable.

Column : The variable value
is recalculated at the end of
each column.
Group : The variable value
is recalculated when
the group specified by
incrementGroup changes.
None : The variable value is
recalculated with every record.
Page : The variable value is
recalculated at the end of
every page.
Report : The variable value is
recalculated once, at the end
of the report.

incrementGroup Determines the
name of the group
at which the
variable value is
recalculated, when
incrementType
is Group .

The name of any group
declared in the JRXML
report template.

N/A