net.sf.reportengine.core.calc

Class CountGroupCalculator

java.lang.Object

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

net.sf.reportengine.core.calc.CountGroupCalculator

All Implemented Interfaces:

GroupCalculator<Integer,DefaultCalcIntermResult<Integer>,Object>

public class CountGroupCalculator
extends AbstractGroupCalculator<Integer,DefaultCalcIntermResult<Integer>,Object>

Universal count calculator. Counts the objects passed through #compute(DefaultCalcIntermResult, Object) method using the an immutable DefaultCalcIntermResult object.

Author:

dragos balan

Field Summary

Fields

Modifier and Type	Field and Description
static String	LABEL the label

Constructor Summary

Constructors

Constructor and Description
CountGroupCalculator() constructor (sets the label = "Count")
CountGroupCalculator(String label) Use this constructor when you want to control the label

Method Summary

Modifier and Type	Method and Description
DefaultCalcIntermResult<Integer>	compute(DefaultCalcIntermResult<Integer> intermResult, Object newValue) increases the count
DefaultCalcIntermResult<Integer>	init() initializes the counter to zero

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 label

See Also:

Constant Field Values

Constructor Detail

CountGroupCalculator

public CountGroupCalculator()

constructor (sets the label = "Count")

CountGroupCalculator

public CountGroupCalculator(String label)

Use this constructor when you want to control the label

Parameters:

label - the label

Method Detail

init

public DefaultCalcIntermResult<Integer> init()

initializes the counter to zero

Returns:

the initial value of the intermediate result

compute

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

increases the count

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: