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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <math.h>
#include <parc/algol/parc_Object.h>
#include <parc/algol/parc_DisplayIndented.h>
#include <parc/algol/parc_Memory.h>
#include <parc/statistics/parc_EWMA.h>
struct PARCEWMA {
bool initialized;
int64_t value;
double coefficient;
double coefficient_r;
};
static inline bool
_parcEWMA_FloatEquals(double x, double y, double e)
{
return fabs(x - y) < e;
}
static bool
_parcEWMA_Destructor(PARCEWMA **instancePtr)
{
assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCEWMA pointer.");
return true;
}
parcObject_ImplementAcquire(parcEWMA, PARCEWMA);
parcObject_ImplementRelease(parcEWMA, PARCEWMA);
parcObject_Override(
PARCEWMA, PARCObject,
.destructor = (PARCObjectDestructor *) _parcEWMA_Destructor,
.copy = (PARCObjectCopy *) parcEWMA_Copy,
.toString = (PARCObjectToString *) parcEWMA_ToString,
.equals = (PARCObjectEquals *) parcEWMA_Equals,
.compare = (PARCObjectCompare *) parcEWMA_Compare,
.hashCode = (PARCObjectHashCode *) parcEWMA_HashCode,
.toJSON = (PARCObjectToJSON *) parcEWMA_ToJSON);
void
parcEWMA_AssertValid(const PARCEWMA *instance)
{
assertTrue(parcEWMA_IsValid(instance),
"PARCEWMA is not valid.");
}
PARCEWMA *
parcEWMA_Create(double coefficient)
{
PARCEWMA *result = parcObject_CreateInstance(PARCEWMA);
if (result != NULL) {
result->initialized = false;
result->value = 0;
result->coefficient = coefficient;
result->coefficient_r = 1.0 - coefficient;
}
return result;
}
int
parcEWMA_Compare(const PARCEWMA *instance, const PARCEWMA *other)
{
int result = 0;
if (instance == other) {
result = 0;
} else if (instance == NULL) {
result = -1;
} else if (other == NULL) {
result = 1;
} else {
result = instance->value - other->value;
}
return result;
}
PARCEWMA *
parcEWMA_Copy(const PARCEWMA *original)
{
PARCEWMA *result = parcEWMA_Create(original->coefficient);
result->initialized = original->initialized;
result->value = original->value;
return result;
}
void
parcEWMA_Display(const PARCEWMA *ewma, int indentation)
{
parcDisplayIndented_PrintLine(indentation,
"PARCEWMA@%p { .initialized=%s .coefficient=%lf, .value=%" PRId64 " }",
ewma,
ewma->initialized ? "true" : "false",
ewma->coefficient,
ewma->value);
}
bool
parcEWMA_Equals(const PARCEWMA *x, const PARCEWMA *y)
{
bool result = false;
if (x == y) {
result = true;
} else if (x == NULL || y == NULL) {
result = false;
} else {
if (x->initialized == y->initialized) {
if (_parcEWMA_FloatEquals(x->coefficient, y->coefficient, 0.00001)) {
if (_parcEWMA_FloatEquals(x->value, y->value, 0.00001)) {
result = true;
}
}
}
}
return result;
}
PARCHashCode
parcEWMA_HashCode(const PARCEWMA *instance)
{
PARCHashCode result = 0;
return result;
}
bool
parcEWMA_IsValid(const PARCEWMA *instance)
{
bool result = false;
if (instance != NULL) {
result = true;
}
return result;
}
PARCJSON *
parcEWMA_ToJSON(const PARCEWMA *instance)
{
PARCJSON *result = parcJSON_Create();
if (result != NULL) {
}
return result;
}
char *
parcEWMA_ToString(const PARCEWMA *ewma)
{
char *result = parcMemory_Format("PARCEWMA@%p { .initialized=%s .coefficient=%lf, .value=%" PRId64 " }",
ewma,
ewma->initialized ? "true" : "false",
ewma->coefficient,
ewma->value);
return result;
}
int64_t
parcEWMA_Update(PARCEWMA *ewma, const int64_t value)
{
if (ewma->initialized) {
// E_t = a * V + (1 - a) * E_(t-1)
double x = (ewma->coefficient * value);
double y = (ewma->coefficient_r * ewma->value);
ewma->value = x + y;
} else {
ewma->value = value;
ewma->initialized = true;
}
return ewma->value;
}
int64_t
parcEWMA_GetValue(const PARCEWMA *ewma)
{
return ewma->value;
}
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