net.sf.reportengine.core.calc

Class MinGroupCalculator

java.lang.Object

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

net.sf.reportengine.core.calc.MinGroupCalculator

All Implemented Interfaces:

GroupCalculator<BigDecimal,DefaultCalcIntermResult<BigDecimal>,Object>

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

This is an universal min group calculator. It accepts as new values any object and tries to convert them to BigDecimal ( by new BigDecimal(object.toString())). The new constructed big decimal is then compared to the previous min so that a new min is obtained.

Author:

dragos balan

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
DefaultCalcIntermResult<BigDecimal>	compute(DefaultCalcIntermResult<BigDecimal> intermResult, Object newValue) compares the previous result with the new value and returns the minimum
DefaultCalcIntermResult<BigDecimal>	init() returns a BigDecimal having Double.MAX_VALUE value

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

MinGroupCalculator

public MinGroupCalculator()

builds this group calculator with the default label

MinGroupCalculator

public MinGroupCalculator(String label)

builds this group calculator with a custom label

Parameters:

label - the label

Method Detail

init

public DefaultCalcIntermResult<BigDecimal> init()

returns a BigDecimal having Double.MAX_VALUE value

Returns:

the initial value of the intermediate result

compute

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

compares the previous result with the new value and returns the minimum

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: