net.sf.reportengine.core.calc

Class SumGroupCalculator

java.lang.Object

net.sf.reportengine.core.calc.AbstractGroupCalculator<BigDecimal,DefaultCalcIntermResult<BigDecimal>,Object>

net.sf.reportengine.core.calc.SumGroupCalculator

All Implemented Interfaces:

GroupCalculator<BigDecimal,DefaultCalcIntermResult<BigDecimal>,Object>

public class SumGroupCalculator
extends AbstractGroupCalculator<BigDecimal,DefaultCalcIntermResult<BigDecimal>,Object>

computes the sum of the values passed through the compute method. This implementation is not optimized because 1.it uses the BigDecimal as result type 2.it tries to work with any kind of object by converting it to BigDecimal (i.e new BigDecimal(object.toString()))

Author:

dragos balan

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
SumGroupCalculator() builds this group calculator with the default label
SumGroupCalculator(String label) builds this group calculator with the given label

Method Summary

Modifier and Type	Method and Description
DefaultCalcIntermResult<BigDecimal>	compute(DefaultCalcIntermResult<BigDecimal> intermResult, Object newValue) adds the new value to the previous intermediate result by converting it to BigDecimal.
DefaultCalcIntermResult<BigDecimal>	init() initializes with zero the intermediate result ( to start the sum computation)

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

SumGroupCalculator

public SumGroupCalculator()

builds this group calculator with the default label

SumGroupCalculator

public SumGroupCalculator(String label)

builds this group calculator with the given label

Parameters:

label - the label

Method Detail

init

public DefaultCalcIntermResult<BigDecimal> init()

initializes with zero the intermediate result ( to start the sum computation)

Returns:

the initial value of the intermediate result

compute

public DefaultCalcIntermResult<BigDecimal> compute(DefaultCalcIntermResult<BigDecimal> intermResult,
                                                   Object newValue)

adds the new value to the previous intermediate result by converting it to BigDecimal.

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: