Examples of org.pentaho.reporting.engine.classic.core.function.ItemSumFunction

org.pentaho.reporting.engine.classic.core.function.ItemSumFunction

A report function that calculates the sum of one field (column) from the data-row. 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 either java.lang.Number instances or Strings that can be parsed to java.lang.Number instances using a java.text.DecimalFormat.

The function undestands two parameters, the field parameter is required and denotes the name of an ItemBand-field which gets summed up.

The parameter group denotes the name of a group. When this group is started, the counter gets reseted to null. @author Thomas Morgner

   */
  private ExpressionCollection createFunctions()
  {
    final ExpressionCollection functions = new ExpressionCollection();


    final ItemSumFunction sum = new ItemSumFunction();
    sum.setName("sum");
    sum.setField("Population");
    sum.setGroup("Continent Group");
    functions.add(sum);


    final RowBandingFunction backgroundTrigger = new RowBandingFunction();
    backgroundTrigger.setName("backgroundTrigger");
    functions.add(backgroundTrigger);

   */
  private ExpressionCollection createFunctions()
  {
    final ExpressionCollection functions = new ExpressionCollection();


    final ItemSumFunction sum = new ItemSumFunction();
    sum.setName("sum");
    sum.setField("Population");
    sum.setGroup("Continent Group");
    functions.add(sum);


    final RowBandingFunction backgroundTrigger = new RowBandingFunction();
    backgroundTrigger.setName("backgroundTrigger");
    functions.add(backgroundTrigger);

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