org.pentaho.reporting.engine.classic.core.function
Class FormulaFunction

java.lang.Object
  org.pentaho.reporting.engine.classic.core.function.AbstractExpression
      org.pentaho.reporting.engine.classic.core.function.AbstractFunction
          org.pentaho.reporting.engine.classic.core.function.FormulaFunction

All Implemented Interfaces:

Serializable, Cloneable, EventListener, ReportListener, Expression, Function

public final class FormulaFunction
extends AbstractFunction

The formula function is a stateful version of the FormulaExpression and is used to evaluate a LibFormula/OpenFormula expression. This function can be used if a stateful evaluation is needed or if the formula value should be initialized to a certain value before the real evaluation starts.

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

FormulaFunction()
Default Constructor.

Method Summary

Object	clone() Clones the expression, expression should be reinitialized after the cloning.
String	getFormula() Returns the formula (incuding the optional namespace) as defined by the OpenFormula standard.
String	getFormulaExpression() Returns the formula expression.
String	getFormulaNamespace() Returns the formula namespace.
String	getInitial() Returns the initial formula (incuding the optional namespace) as defined by the OpenFormula standard.
String	getInitialExpression() Returns the initial formula expression.
String	getInitialNamespace() Returns the formula namespace if the initial formula.
Object	getValue() Return the computed value of the formula.
void	reportInitialized(ReportEvent event) Resets the function state.
void	setFormula(String formula) Defines the formula (incuding the optional namespace) as defined by the OpenFormula standard.
void	setInitial(String initial) Defines the initial formula (incuding the optional namespace) as defined by the OpenFormula standard.

Methods inherited from class org.pentaho.reporting.engine.classic.core.function.AbstractFunction

groupFinished, groupStarted, itemsAdvanced, itemsFinished, itemsStarted, reportDone, reportFinished, reportStarted

Methods inherited from class org.pentaho.reporting.engine.classic.core.function.AbstractExpression

getDataRow, getDependencyLevel, getInstance, getName, getReportConfiguration, getResourceBundleFactory, getRuntime, isActive, isDeepTraversing, isPreserve, setActive, setDependencyLevel, setName, setPreserve, setRuntime

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.pentaho.reporting.engine.classic.core.function.Expression

getDataRow, getDependencyLevel, getInstance, getName, getReportConfiguration, getResourceBundleFactory, getRuntime, isActive, isDeepTraversing, isPreserve, setDependencyLevel, setName, setRuntime

Constructor Detail

FormulaFunction

public FormulaFunction()

Default Constructor.

Method Detail

getInitial

public String getInitial()

Returns the initial formula (incuding the optional namespace) as defined by the OpenFormula standard.

Returns:

the formula as text.

getInitialExpression

public String getInitialExpression()

Returns the initial formula expression. The initial formula is used at the first call only.

Returns:

the initial formula expression.

getInitialNamespace

public String getInitialNamespace()

Returns the formula namespace if the initial formula. If the formula specified by the user starts with "=", then the namespace "report" is assumed.

Returns:

the namespace of the formula.

setInitial

public void setInitial(String initial)

Defines the initial formula (incuding the optional namespace) as defined by the OpenFormula standard. The initial formula is used at the first call only.

Parameters:

initial - the initial formula as text.

reportInitialized

public void reportInitialized(ReportEvent event)

Resets the function state.

Specified by:

reportInitialized in interface ReportListener

Overrides:

reportInitialized in class AbstractFunction

Parameters:

event - the report event.

getFormula

public String getFormula()

Returns the formula (incuding the optional namespace) as defined by the OpenFormula standard.

Returns:

the formula as text.

getFormulaNamespace

public String getFormulaNamespace()

Returns the formula namespace. If the formula specified by the user starts with "=", then the namespace "report" is assumed.

Returns:

the namespace of the formula.

getFormulaExpression

public String getFormulaExpression()

Returns the formula expression.

Returns:

the formula expression.

setFormula

public void setFormula(String formula)

Defines the formula (incuding the optional namespace) as defined by the OpenFormula standard.

Parameters:

formula - the formula as text.

getValue

public Object getValue()

Return the computed value of the formula. The first call will return the initial-value instead.

Returns:

the value of the function.

clone

public Object clone()
             throws CloneNotSupportedException

Clones the expression, expression should be reinitialized after the cloning.

Expression maintain no state, cloning is done at the beginning of the report processing to disconnect the used expression from any other object space.

Specified by:

clone in interface Expression

Overrides:

clone in class AbstractExpression

Returns:

A clone of this expression.

Throws:

CloneNotSupportedException - this should never happen.