52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
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//
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// Created by david on 03.03.2026.
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//
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#include <jni.h>
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#include "StepDetector.h"
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#include <new>
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#include <vector>
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extern "C" {
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jint throwIllegalArgumentException(JNIEnv *env, const char *message)
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{
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jclass exClass;
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const char *className = "java/lang/IllegalArgumentException";
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exClass = env->FindClass(className);
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if (exClass == nullptr) {
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return -1;
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}
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return env->ThrowNew(exClass, message);
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}
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JNIEXPORT jlong JNICALL
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Java_at_lockstep_filter_StepDetector_native_1create(
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JNIEnv *env,
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jclass /*unused*/, jlong engineHandle) {
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auto *listener = reinterpret_cast<StepListener *>(engineHandle);
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// We use std::nothrow so `new` returns a nullptr if the engine creation fails
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auto *detector = new(std::nothrow) StepDetector(listener);
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return reinterpret_cast<jlong>(detector);
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}
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JNIEXPORT void JNICALL
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Java_at_lockstep_filter_StepDetector_native_1delete(
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JNIEnv *env,
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jclass /*unused*/, jlong handle) {
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delete reinterpret_cast<StepDetector *>(handle);
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}
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JNIEXPORT void JNICALL
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Java_at_lockstep_filter_StepDetector_native_1filter(
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JNIEnv *env,
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jclass /*unused*/, jlong handle, jlong timestamp, jfloatArray values) {
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if(values == nullptr) throwIllegalArgumentException(env, "values == null");
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float* nativeValues = (float *)env->GetFloatArrayElements(values, 0);
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jsize length = env->GetArrayLength(values);
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std::vector<float> vecValues(nativeValues, nativeValues + length);
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auto *detector = reinterpret_cast<StepDetector *>(handle);
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detector->filter(vecValues);
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}
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}
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