/**
* Compares two {@link KeyedValue} instances and returns an <code>int</code> that indicates the
* relative order of the two objects.
*
* @param o1 object 1.
* @param o2 object 2.
* @return An int indicating the relative order of the objects.
*/
@Override
public int compare(Object o1, Object o2) {
if (o2 == null) {
return -1;
}
if (o1 == null) {
return 1;
}
int result;
KeyedValue kv1 = (KeyedValue) o1;
KeyedValue kv2 = (KeyedValue) o2;
if (this.type == KeyedValueComparatorType.BY_KEY) {
if (this.order.equals(SortOrder.ASCENDING)) {
result = kv1.getKey().compareTo(kv2.getKey());
} else if (this.order.equals(SortOrder.DESCENDING)) {
result = kv2.getKey().compareTo(kv1.getKey());
} else {
throw new IllegalArgumentException("Unrecognised sort order.");
}
} else if (this.type == KeyedValueComparatorType.BY_VALUE) {
Number n1 = kv1.getValue();
Number n2 = kv2.getValue();
if (n2 == null) {
return -1;
}
if (n1 == null) {
return 1;
}
double d1 = n1.doubleValue();
double d2 = n2.doubleValue();
if (this.order.equals(SortOrder.ASCENDING)) {
if (d1 > d2) {
result = 1;
} else if (d1 < d2) {
result = -1;
} else {
result = 0;
}
} else if (this.order.equals(SortOrder.DESCENDING)) {
if (d1 > d2) {
result = -1;
} else if (d1 < d2) {
result = 1;
} else {
result = 0;
}
} else {
throw new IllegalArgumentException("Unrecognised sort order.");
}
} else {
throw new IllegalArgumentException("Unrecognised type.");
}
return result;
}
/**
* @param a_index the index of the item to return the value for
* @return the value at given index
* @author Klaus Meffert
* @since 2.3
*/
public Number getValue(final int a_index) {
Number result;
final KeyedValue kval = (KeyedValue) m_data.get(a_index);
if (kval != null) {
result = kval.getValue();
} else {
result = null;
}
return result;
}