/**
* Reduce By
*
* @param array array of items to reduce by
* @param length where to end in the array
* @param function function
* @param function functionName
* @return reduction
*/
public static long reduceBy(final int[] array, int length, Object function, String functionName) {
if (function.getClass().isAnonymousClass()) {
return reduceByR(array, length, function, functionName);
}
try {
ConstantCallSite callSite =
Invoker.invokeReducerLongIntReturnLongMethodHandle(function, functionName);
MethodHandle methodHandle = callSite.dynamicInvoker();
try {
long sum = 0;
for (int index = 0; index < length; index++) {
int v = array[index];
sum = (long) methodHandle.invokeExact(sum, v);
}
return sum;
} catch (Throwable throwable) {
return handle(Long.class, throwable, "Unable to perform reduceBy");
}
} catch (Exception ex) {
return reduceByR(array, length, function, functionName);
}
}
/**
* Reflection based reduce by.
*
* @param array array of items to reduce by
* @param object function
* @param methodName name of method
* @param <T> type of function
* @return reduction
*/
private static <T> long reduceByR(final int[] array, T object, String methodName) {
try {
Method method = Invoker.invokeReducerLongIntReturnLongMethod(object, methodName);
long sum = 0;
for (int v : array) {
sum = (long) method.invoke(object, sum, v);
}
return sum;
} catch (Throwable throwable) {
return handle(Long.class, throwable, "Unable to perform reduceBy");
}
}
/**
* Reflection based reduce by.
*
* @param array array of items to reduce by
* @param object function
* @param <T> type of function
* @return reduction
*/
private static <T> long reduceByR(final int[] array, int length, T object) {
try {
Method method = Invoker.invokeReducerLongIntReturnLongMethod(object);
long sum = 0;
for (int index = 0; index < length; index++) {
int v = array[index];
sum = (long) method.invoke(object, sum, v);
}
return sum;
} catch (Throwable throwable) {
return handle(Long.class, throwable, "Unable to perform reduceBy");
}
}
public Group(Grouping grouping, Class<?> cls, List<?> list) {
this.grouping = grouping;
ArrayList<Criteria> criteriaArrayList = new ArrayList();
List<List<?>> lists = (List<List<?>>) list;
for (List args : lists) {
args = new ArrayList(args);
args.add(1, cls);
Object o = atIndex(args, -1);
if (!(o instanceof List)) {
atIndex(args, -1, Collections.singletonList(o));
}
Criteria criteria =
(Criteria) Invoker.invokeFromObject(ObjectFilter.class, "createCriteriaFromClass", args);
criteriaArrayList.add(criteria);
}
this.expressions = criteriaArrayList;
}
/**
* Reduce by functional support for int arrays.
*
* @param array array of items to reduce by
* @param object object that contains the reduce by function
* @param <T> the type of object
* @return the final reduction
*/
public static <T> long reduceBy(final int[] array, T object) {
if (object.getClass().isAnonymousClass()) {
return reduceByR(array, object);
}
try {
ConstantCallSite callSite = Invoker.invokeReducerLongIntReturnLongMethodHandle(object);
MethodHandle methodHandle = callSite.dynamicInvoker();
try {
long sum = 0;
for (int v : array) {
sum = (long) methodHandle.invokeExact(sum, v);
}
return sum;
} catch (Throwable throwable) {
return handle(Long.class, throwable, "Unable to perform reduceBy");
}
} catch (Exception ex) {
return reduceByR(array, object);
}
}
