/**
* Check if category exist in output data if no add new element if yes adds next amount to
* category
*
* @param c Coast to add
* @return BigDecimal
*/
public BigDecimal calculateValue(Cost c) {
BigDecimal value = null;
String key = null;
key = c.getCategory();
if (outputData.containsKey(key)) {
value = outputData.get(key).add(c.getValue());
} else {
value = c.getValue();
}
return value;
}
/**
* Group data by category and sum cost
*
* @return Grouped categories LinkedHashMap
*/
public LinkedHashMap<String, BigDecimal> sumByCategory() {
ListIterator<Cost> listIterator = inputData.listIterator();
BigDecimal value = null;
String key = null;
while (listIterator.hasNext()) {
Cost c = listIterator.next();
key = c.getCategory();
value = calculateValue(c);
outputData.put(key, value);
}
return outputData;
}