private MutableAttributeSplitRequest createRequest(final Object value, final int childrenCount) {
final IAttributeStorage parentAttributeStorage = NullAttributeStorage.instance;
final List<IAttributeStorage> attributeStorages =
new ArrayList<IAttributeStorage>(childrenCount);
for (int i = 0; i < childrenCount; i++) {
attributeStorages.add(NullAttributeStorage.instance);
}
final MutableAttributeSplitRequest request =
new MutableAttributeSplitRequest(parentAttributeStorage, attributeStorages, attribute);
request.setValueInitial(value);
request.setValueToSplit(value);
return request;
}
private void test(
final BigDecimal valueToSplit, final int childrenCount, final MathContext mathContext) {
final String info =
"ValueToSplit="
+ valueToSplit
+ ", childrenCount="
+ childrenCount
+ ", mathContext="
+ mathContext;
final int precision = mathContext.getPrecision();
final BigDecimal splitValueExpected =
valueToSplit.divide(BigDecimal.valueOf(childrenCount), mathContext);
// Delta: tolerated difference between calculated split value and actual split value
// i.e. 1^(-precision) = 1/(1^precision) ... because BigDecimal does not support negative powers
final BigDecimal splitValueExpectedDelta = BigDecimal.ONE.divide(BigDecimal.ONE.pow(precision));
// Example: For ValueToSplit=100, childrenCount=33, precision=2
// splitValueExpected = 0.03
// splitValueExpectedDelta = 1^(-2) = 0.01
final MutableAttributeSplitRequest request = createRequest(valueToSplit, childrenCount);
BigDecimal splitValueSUM = BigDecimal.ZERO;
for (int index = 0; index < childrenCount; index++) {
//
// Update request current index
request.setAttributeStorageCurrent(request.getAttributeStorages().get(index));
request.setAttributeStorageCurrentIndex(index);
//
// Execute splitting
final IAttributeSplitResult result = splitter.split(request);
//
// Get and check split value
final BigDecimal splitValue = (BigDecimal) result.getSplitValue();
assertEquals(
"Invalid split value on index=" + index + "\n" + info,
splitValueExpected, // expected
splitValue, // actual
splitValueExpectedDelta // delta
);
//
// Update SUM of split values
splitValueSUM = splitValueSUM.add(splitValue);
//
// Update: request's ValueToSplit = last split remaining value
final BigDecimal remainingValue = (BigDecimal) result.getRemainingValue();
final BigDecimal remainingValueExpected = valueToSplit.subtract(splitValueSUM);
assertEquals(
"Invalid remaining value on index=" + index + "\n" + info,
remainingValueExpected, // expected
remainingValue, // actual
BigDecimal.ZERO // delta=exact
);
request.setValueToSplit(remainingValue);
}
//
// Assume: sum of all split values shall be the same as initial value to split
Assert.assertThat(
"Invalid splitValues SUM" + "\n" + info,
splitValueSUM, // actual
Matchers.comparesEqualTo(valueToSplit) // expected
);
}