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ktaglib: introduce tag map data structure

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Alexander Capehart 2024-12-12 18:38:40 -07:00
parent be54ee9c18
commit 5042d3f5f2
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2 changed files with 106 additions and 0 deletions
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70
ktaglib/src/main/cpp/JVMTagMap.cpp Normal file
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//
// Created by oxycblt on 12/12/24.
//
#include "JVMTagMap.h"
JVMTagMap::JVMTagMap(JNIEnv *env) : env(env) {
jclass hashMapClass = env->FindClass("java/util/HashMap");
jmethodID init = env->GetMethodID(hashMapClass, "<init>", "()V");
hashMap = env->NewObject(hashMapClass, init);
hashMapGetMethod = env->GetMethodID(hashMapClass, "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
hashMapPutMethod = env->GetMethodID(hashMapClass, "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
env->DeleteLocalRef(hashMapClass);
jclass arrayListClass = env->FindClass("java/util/ArrayList");
arrayListInitMethod = env->GetMethodID(arrayListClass, "<init>", "()V");
arrayListAddMethod = env->GetMethodID(arrayListClass, "add", "(Ljava/lang/Object;)Z");
env->DeleteLocalRef(arrayListClass);
}
JVMTagMap::~JVMTagMap() {
env->DeleteLocalRef(hashMap);
}
void JVMTagMap::add(TagLib::String &key, TagLib::String &value) {
jstring jKey = env->NewStringUTF(key.toCString(true));
jstring jValue = env->NewStringUTF(value.toCString(true));
// check if theres already a value arraylist in the map
jobject existingValue = env->CallObjectMethod(hashMap, hashMapGetMethod, jKey);
// if there is, add to the value to the existing arraylist
if (existingValue != nullptr) {
env->CallBooleanMethod(existingValue, arrayListAddMethod, jValue);
} else {
// if there isn't, create a new arraylist and add the value to it
jclass arrayListClass = env->FindClass("java/util/ArrayList");
jobject arrayList = env->NewObject(arrayListClass, arrayListInitMethod);
env->CallBooleanMethod(arrayList, arrayListAddMethod, jValue);
env->CallObjectMethod(hashMap, hashMapPutMethod, jKey, arrayList);
env->DeleteLocalRef(arrayListClass);
}
}
void JVMTagMap::add(TagLib::String &key, TagLib::StringList &value) {
jstring jKey = env->NewStringUTF(key.toCString(true));
// check if theres already a value arraylist in the map
jobject existingValue = env->CallObjectMethod(hashMap, hashMapGetMethod, jKey);
// if there is, add to the value to the existing arraylist
if (existingValue != nullptr) {
for (auto &val : value) {
jstring jValue = env->NewStringUTF(val.toCString(true));
env->CallBooleanMethod(existingValue, arrayListAddMethod, jValue);
}
} else {
// if there isn't, create a new arraylist and add the value to it
jclass arrayListClass = env->FindClass("java/util/ArrayList");
jobject arrayList = env->NewObject(arrayListClass, arrayListInitMethod);
for (auto &val : value) {
jstring jValue = env->NewStringUTF(val.toCString(true));
env->CallBooleanMethod(arrayList, arrayListAddMethod, jValue);
}
env->CallObjectMethod(hashMap, hashMapPutMethod, jKey, arrayList);
env->DeleteLocalRef(arrayListClass);
}
}
jobject JVMTagMap::getObject() {
return hashMap;
}

36
ktaglib/src/main/cpp/JVMTagMap.h Normal file
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//
// Created by oxycblt on 12/12/24.
//
#ifndef AUXIO_JVMTAGMAP_H
#define AUXIO_JVMTAGMAP_H
#include <jni.h>
#include <string_view>
#include <taglib/tstring.h>
#include <taglib/tstringlist.h>
class JVMTagMap {
public:
JVMTagMap(JNIEnv *env);
~JVMTagMap();
JVMTagMap(const JVMTagMap &) = delete;
JVMTagMap &operator=(const JVMTagMap &) = delete;
void add(TagLib::String &key, TagLib::String &value);
void add(TagLib::String &key, TagLib::StringList &value);
jobject getObject();
private:
JNIEnv *env;
jobject hashMap;
jmethodID hashMapGetMethod;
jmethodID hashMapPutMethod;
jmethodID arrayListInitMethod;
jmethodID arrayListAddMethod;
};
#endif //AUXIO_JVMTAGMAP_H