org.jfree.report.function
Class TotalGroupSumQuotientFunction

java.lang.Object
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  +--org.jfree.report.function.AbstractExpression
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        +--org.jfree.report.function.AbstractFunction
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              +--org.jfree.report.function.TotalGroupSumQuotientFunction

Direct Known Subclasses:

TotalGroupSumQuotientPercentFunction

public class TotalGroupSumQuotientFunction

extends AbstractFunction

A report function that calculates the quotient of two summed fields (columns) from the TableModel. This function produces a global total. The total sum of the group is known when the group processing starts and the report is not performing a prepare-run. The sum is calculated in the prepare run and recalled in the printing run.

The function can be used in two ways:

• to calculate a quotient for the entire report;
• to calculate a quotient 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 tree parameters. The dividend parameter is required and denotes the name of an ItemBand-field which gets summed up as dividend. The divisor parameter is required and denotes the name of an ItemBand-field which gets summed up as divisor.

The parameter group denotes the name of a group. When this group is started, the counter gets reseted to null. This parameter is optional.

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

TotalGroupSumQuotientFunction()
Constructs a new function.

Method Summary

java.lang.String	getDividend() Returns the field used as dividend by the function.
java.lang.String	getDivisor() Returns the field used as divisor by the function.
java.lang.String	getGroup() Returns the name of the group to be totalled.
Expression	getInstance() Return a completly separated copy of this function.
java.lang.Object	getValue() Return the current function value.
void	groupStarted(ReportEvent event) Receives notification that a group has started.
void	itemsAdvanced(ReportEvent event) Receives notification that a row of data is being processed.
void	reportInitialized(ReportEvent event) Receives notification that the report has started.
void	setDividend(java.lang.String dividend) Sets the field name to be used as dividend for the function.
void	setDivisor(java.lang.String divisor) Sets the field name to be used as divisor for the function.
void	setGroup(java.lang.String group) Defines the name of the group to be totalled.

Methods inherited from class org.jfree.report.function.AbstractFunction

clone, groupFinished, itemsFinished, itemsStarted, reportDone, reportFinished, reportStarted

Methods inherited from class org.jfree.report.function.AbstractExpression

getDataRow, getDependencyLevel, getName, getReportConfiguration, getResourceBundleFactory, getRuntime, isActive, setActive, setDependencyLevel, setName, setRuntime

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TotalGroupSumQuotientFunction

public TotalGroupSumQuotientFunction()

Constructs a new function.

Initially the function has no name...be sure to assign one before using the function.

Method Detail

reportInitialized

public void reportInitialized(ReportEvent event)

Receives notification that the report has started.

Overrides:

reportInitialized in class AbstractFunction

Parameters:

event - the event.

groupStarted

public void groupStarted(ReportEvent event)

Receives notification that a group has started.

Overrides:

groupStarted in class AbstractFunction

Parameters:

event - the event.

itemsAdvanced

public void itemsAdvanced(ReportEvent event)

Receives notification that a row of data is being processed.

Overrides:

itemsAdvanced in class AbstractFunction

Parameters:

event - the event.

getGroup

public java.lang.String getGroup()

Returns the name of the group to be totalled.

Returns:

the group name.

setGroup

public void setGroup(java.lang.String group)

Defines the name of the group to be totalled. If the name is null, all groups are totalled.

Parameters:

group - the group name.

getValue

public java.lang.Object getValue()

Return the current function value.

The value depends (obviously) on the function implementation. For example, a page counting function will return the current page number.

Returns:

The value of the function.

getDividend

public java.lang.String getDividend()

Returns the field used as dividend by the function.

The field name corresponds to a column name in the report's TableModel.

Returns:

The field name.

getDivisor

public java.lang.String getDivisor()

Returns the field used as divisor by the function.

The field name corresponds to a column name in the report's TableModel.

Returns:

The field name.

setDividend

public void setDividend(java.lang.String dividend)

Sets the field name to be used as dividend for the function.

The field name corresponds to a column name in the report's TableModel.

Parameters:

dividend - the field name (null not permitted).

setDivisor

public void setDivisor(java.lang.String divisor)

Sets the field name to be used as divisor for the function.

The field name corresponds to a column name in the report's TableModel.

Parameters:

divisor - the field name (null not permitted).

getInstance

public Expression getInstance()

Return a completly separated copy of this function. The copy does no longer share any changeable objects with the original function.

Overrides:

getInstance in class AbstractExpression

Returns:

a copy of this function.