public class DefaultSummaryCalculator extends Object implements SummaryCalculator, Cloneable
DefaultSummaryCalculator sc = new DefaultSummaryCalculator(){
final int SUMMARY_LAST_VALUE = PivotConstants.SUMMARY_RESERVED_MAX + 1;
private double _lastValue;
public void addValue(Object v) {
super.addValue(v);
if (object instanceof Number) {
_lastValue = ((Number) object).doubleValue();
}
}
public void clear() {
super.clear();
_lastValue = 0;
}
public int getNumberOfSummaries() {
return super.getNumberOfSummaries() + 1;
}
public String getSummaryName(int type) {
if(type == SUMMARY_LAST_VALUE) {
return "Last Value";
}
return super.getSummaryName(type);
}
public Object getSummaryResult(int type) {
if(type == SUMMARY_LAST_VALUE) {
return new Double(_lastValue);
}
return super.getSummaryResult(type);
}
};
DefaultSummaryCalculator because we just need to add one more summary. If you want
to provide your own way to calculate the summaries, you can implement SummaryCalculator interface directly.
DefaultSummaryCalculator has built-in support for Numbers, BigDecimals, Dates/Calendars, Strings and
Booleans. If you need to calculate other data types, you can create your own SummaryCalculator extending
DefaultSummaryCalculator.ALLOWED_SUMMARIES_ALL, ALLOWED_SUMMARIES_COUNT, ALLOWED_SUMMARIES_MAX_MIN_COUNT, SUMMARY_CONSTANT, SUMMARY_COUNT, SUMMARY_CUSTOM, SUMMARY_MAX, SUMMARY_MEAN, SUMMARY_MIN, SUMMARY_NONE, SUMMARY_RESERVED_MAX, SUMMARY_STDDEV, SUMMARY_SUM, SUMMARY_VAR| Constructor and Description |
|---|
DefaultSummaryCalculator() |
| Modifier and Type | Method and Description |
|---|---|
void |
addValue(Object object)
Adds a value for calculation.
|
void |
clear()
Clears all previous added values.
|
Object |
clone() |
int[] |
getAllowedSummaries(Class<?> type)
Gets the allowed summary types for a data type.
|
int[] |
getAllowedSummaries(Class<?> type,
ConverterContext context)
Gets the allowed summary types.
|
long |
getCount()
Gets the number of values that have been added so far.
|
MathContext |
getMathContext()
Gets the MathContext.
|
int |
getNumberOfSummaries()
Gets the number of summary types.
|
String |
getSummaryName(Locale locale,
int summaryType)
Gets the summary name for the specified type.
|
Object |
getSummaryResult(int type)
Gets the summary result for the specified type.
|
boolean |
isBiasCorrected()
Checks if the biasCorrect is set.
|
void |
setBiasCorrected(boolean biasCorrected)
Sets the biasCorrected flag.
|
void |
setMathContext(MathContext mathContext)
To calculate statistics for BigDecimals, a MathContext to control the precision.
|
public Object clone() throws CloneNotSupportedException
clone in class ObjectCloneNotSupportedExceptionpublic void addValue(Object object)
SummaryCalculatoraddValue in interface SummaryCalculatorobject - the valuepublic void clear()
SummaryCalculatorclear in interface SummaryCalculatorpublic long getCount()
SummaryCalculatorgetCount in interface SummaryCalculatorpublic int getNumberOfSummaries()
SummaryCalculatorgetNumberOfSummaries in interface SummaryCalculatorpublic String getSummaryName(Locale locale, int summaryType)
SummaryCalculatorgetSummaryName in interface SummaryCalculatorlocale - the current localesummaryType - the summary typepublic Object getSummaryResult(int type)
SummaryCalculatorgetSummaryResult in interface SummaryCalculatortype - the summary typepublic boolean isBiasCorrected()
public void setBiasCorrected(boolean biasCorrected)
biasCorrected - true or false.public MathContext getMathContext()
public void setMathContext(MathContext mathContext)
mathContext - the MathContext.public int[] getAllowedSummaries(Class<?> type)
SummaryCalculatorgetAllowedSummaries in interface SummaryCalculatortype - the data type.public int[] getAllowedSummaries(Class<?> type, ConverterContext context)
getAllowedSummaries in interface SummaryCalculatortype - the data type.context - the converter context. If the type is the same and you want it to have different summary types,
you can use the converter context to make them different.