ItemSumFunction

Description

A report function that calculates the sum of one field (column) from the data source. This function produces a running total, no global total. For a global sum, use the TotalGroupSumFunction function. The function can be used in two ways:

to calculate a sum for the entire report
to calculate a sum within a particular group

This function expects its input values to be java.lang.Number instances.

The function understands two parameters:

field parameter is required and denotes the name of an ItemBand-field which gets summed up.
group parameter denotes the name of a group. When this group is started, the counter gets reset to null.

Example

<expression class="org.jfree.report.function.ItemSumFunction" name="RegionActual">
  <properties>
    <property name="field">ACTUAL</property>
    <property name="group">RegionGroup</property>
  </properties>
</expression>