JNI for dns configuration

2020-10-21 14:18:04 -07:00 · 2020-10-21 14:18:04 -07:00 · 2851a9577c
commit 2851a9577c
parent ed9b09e980
8 changed files with 283 additions and 2 deletions
--- a/java/jni/ZT_jniarray.cpp
+++ b/java/jni/ZT_jniarray.cpp
@ -0,0 +1,111 @@
+//
+// Created by Grant Limberg on 10/21/20.
+//
+
+#include "ZT_jniarray.h"
+#include <vector>
+#include <string>
+
+jclass java_util_ArrayList;
+jmethodID java_util_ArrayList_;
+jmethodID java_util_ArrayList_size;
+jmethodID java_util_ArrayList_get;
+jmethodID java_util_ArrayList_add;
+
+void InitListJNI(JNIEnv* env) {
+    java_util_ArrayList      = static_cast<jclass>(env->NewGlobalRef(env->FindClass("java/util/ArrayList")));
+    java_util_ArrayList_     = env->GetMethodID(java_util_ArrayList, "<init>", "(I)V");
+    java_util_ArrayList_size = env->GetMethodID (java_util_ArrayList, "size", "()I");
+    java_util_ArrayList_get  = env->GetMethodID(java_util_ArrayList, "get", "(I)Ljava/lang/Object;");
+    java_util_ArrayList_add  = env->GetMethodID(java_util_ArrayList, "add", "(Ljava/lang/Object;)Z");
+}
+
+jclass ListJNI::getListClass(JNIEnv* env) {
+    jclass jclazz = env->FindClass("java/util/List");
+    assert(jclazz != nullptr);
+    return jclazz;
+}
+
+jclass ListJNI::getArrayListClass(JNIEnv* env) {
+    jclass jclazz = env->FindClass("java/util/ArrayList");
+    assert(jclazz != nullptr);
+    return jclazz;
+}
+
+jclass ListJNI::getIteratorClass(JNIEnv* env) {
+    jclass jclazz = env->FindClass("java/util/Iterator");
+    assert(jclazz != nullptr);
+    return jclazz;
+}
+
+jmethodID ListJNI::getIteratorMethod(JNIEnv* env) {
+    static jmethodID mid = env->GetMethodID(
+            getListClass(env), "iterator", "()Ljava/util/Iterator;");
+    assert(mid != nullptr);
+    return mid;
+}
+
+jmethodID ListJNI::getHasNextMethod(JNIEnv* env) {
+    static jmethodID mid = env->GetMethodID(
+            getIteratorClass(env), "hasNext", "()Z");
+    assert(mid != nullptr);
+    return mid;
+}
+
+jmethodID ListJNI::getNextMethod(JNIEnv* env) {
+    static jmethodID mid = env->GetMethodID(
+            getIteratorClass(env), "next", "()Ljava/lang/Object;");
+    assert(mid != nullptr);
+    return mid;
+}
+
+jmethodID ListJNI::getArrayListConstructorMethodId(JNIEnv* env, jclass jclazz) {
+    static jmethodID mid = env->GetMethodID(
+            jclazz, "<init>", "(I)V");
+    assert(mid != nullptr);
+    return mid;
+}
+
+jmethodID ListJNI::getListAddMethodId(JNIEnv* env) {
+    static jmethodID mid = env->GetMethodID(
+            getListClass(env), "add", "(Ljava/lang/Object;)Z");
+    assert(mid != nullptr);
+    return mid;
+}
+
+jclass ByteJNI::getByteClass(JNIEnv* env) {
+    jclass jclazz = env->FindClass("java/lang/Byte");
+    assert(jclazz != nullptr);
+    return jclazz;
+}
+
+jmethodID ByteJNI::getByteValueMethod(JNIEnv* env) {
+    static jmethodID mid = env->GetMethodID(
+            getByteClass(env), "byteValue", "()B");
+    assert(mid != nullptr);
+    return mid;
+}
+
+jobject cppToJava(JNIEnv* env, std::vector<std::string> vector) {
+    jobject result = env->NewObject(java_util_ArrayList, java_util_ArrayList_, vector.size());
+    for (std::string s: vector) {
+        jstring element = env->NewStringUTF(s.c_str());
+        env->CallBooleanMethod(result, java_util_ArrayList_add, element);
+        env->DeleteLocalRef(element);
+    }
+    return result;
+}
+
+std::vector<std::string> javaToCpp(JNIEnv* env, jobject arrayList) {
+    jint len = env->CallIntMethod(arrayList, java_util_ArrayList_size);
+    std::vector<std::string> result;
+    result.reserve(len);
+    for (jint i=0; i<len; i++) {
+        jstring element = static_cast<jstring>(env->CallObjectMethod(arrayList, java_util_ArrayList_get, i));
+        const char* pchars = env->GetStringUTFChars(element, nullptr);
+        result.emplace_back(pchars);
+        env->ReleaseStringUTFChars(element, pchars);
+        env->DeleteLocalRef(element);
+    }
+    return result;
+}