net.sf.reportengine.core.calc

Class FirstGroupCalculator<T>

java.lang.Object

net.sf.reportengine.core.calc.AbstractGroupCalculator<T,FirstCalcIntermResult<T>,T>

net.sf.reportengine.core.calc.FirstGroupCalculator<T>

All Implemented Interfaces:

GroupCalculator<T,FirstCalcIntermResult<T>,T>

public class FirstGroupCalculator<T>
extends AbstractGroupCalculator<T,FirstCalcIntermResult<T>,T>

This calculator will return the first value passed after calling init. No matter how many times you call compute(FirstCalcIntermResult, Object) it will always return the first value

Author:

dragos balan

Field Summary

Fields

Modifier and Type	Field and Description
static String	LABEL the default label

Constructor Summary

Constructors

Constructor and Description
FirstGroupCalculator() builds this group calculator with the default label
FirstGroupCalculator(String label) builds this group calculator with a custom label

Method Summary

Modifier and Type	Method and Description
FirstCalcIntermResult<T>	compute(FirstCalcIntermResult<T> intermResult, T newValue) if the previous result is first then it stores the new value inside the intermediate result.
FirstCalcIntermResult<T>	init() returns an empty (null) element with the isFirst flag = true

Methods inherited from class net.sf.reportengine.core.calc.AbstractGroupCalculator

getLabel

Methods inherited from class java.lang.Object

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

Field Detail

LABEL

public static final String LABEL

the default label

See Also:

Constant Field Values

Constructor Detail

FirstGroupCalculator

public FirstGroupCalculator()

builds this group calculator with the default label

FirstGroupCalculator

public FirstGroupCalculator(String label)

builds this group calculator with a custom label

Parameters:

label - the label

Method Detail

init

public FirstCalcIntermResult<T> init()

returns an empty (null) element with the isFirst flag = true

Returns:

the initial value of the intermediate result

compute

public FirstCalcIntermResult<T> compute(FirstCalcIntermResult<T> intermResult,
                                        T newValue)

if the previous result is first then it stores the new value inside the intermediate result. otherwise it returns the previous intermediate result.

Parameters:

intermResult - the previous intermediate result ( it's the 10 in my example)

newValue - the current value (it's the "whatever text" in my example above)

Returns: