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#include "NewtCommon.h"
#include <string.h>
static const char * const ClazzNameRuntimeException = "java/lang/RuntimeException";
static jclass runtimeExceptionClz=NULL;
static JavaVM *_jvmHandle = NULL;
static int _jvmVersion = 0;
void NewtCommon_init(JNIEnv *env) {
if(NULL==_jvmHandle) {
if(0 != (*env)->GetJavaVM(env, &_jvmHandle)) {
NewtCommon_FatalError(env, "NEWT: Can't fetch JavaVM handle");
} else {
_jvmVersion = (*env)->GetVersion(env);
}
jclass c = (*env)->FindClass(env, ClazzNameRuntimeException);
if(NULL==c) {
NewtCommon_FatalError(env, "NEWT: Can't find %s", ClazzNameRuntimeException);
}
runtimeExceptionClz = (jclass)(*env)->NewGlobalRef(env, c);
(*env)->DeleteLocalRef(env, c);
if(NULL==runtimeExceptionClz) {
NewtCommon_FatalError(env, "NEWT: Can't use %s", ClazzNameRuntimeException);
}
}
}
void NewtCommon_FatalError(JNIEnv *env, const char* msg, ...)
{
char buffer[512];
va_list ap;
if( NULL != msg ) {
va_start(ap, msg);
vsnprintf(buffer, sizeof(buffer), msg, ap);
va_end(ap);
fprintf(stderr, "%s\n", buffer);
if(NULL != env) {
(*env)->FatalError(env, buffer);
}
}
}
void NewtCommon_throwNewRuntimeException(JNIEnv *env, const char* msg, ...)
{
char buffer[512];
va_list ap;
if(NULL==_jvmHandle) {
NewtCommon_FatalError(env, "NEWT: NULL JVM handle, call NewtCommon_init 1st\n");
return;
}
if( NULL != msg ) {
va_start(ap, msg);
vsnprintf(buffer, sizeof(buffer), msg, ap);
va_end(ap);
if(NULL != env) {
(*env)->ThrowNew(env, runtimeExceptionClz, buffer);
}
}
}
const char * NewtCommon_GetStaticStringMethod(JNIEnv *jniEnv, jclass clazz, jmethodID jGetStrID, char *dest, int destSize, const char *altText) {
if(NULL != jniEnv && NULL != clazz && NULL != jGetStrID) {
jstring jstr = (jstring) (*jniEnv)->CallStaticObjectMethod(jniEnv, clazz, jGetStrID);
if(NULL != jstr) {
const char * str = (*jniEnv)->GetStringUTFChars(jniEnv, jstr, NULL);
if( NULL != str) {
strncpy(dest, str, destSize-1);
dest[destSize-1] = 0; // EOS
(*jniEnv)->ReleaseStringUTFChars(jniEnv, jstr, str);
return dest;
}
}
}
strncpy(dest, altText, destSize-1);
dest[destSize-1] = 0; // EOS
return dest;
}
jchar* NewtCommon_GetNullTerminatedStringChars(JNIEnv* env, jstring str)
{
jchar* strChars = NULL;
if( NULL != env && 0 != str ) {
strChars = calloc((*env)->GetStringLength(env, str) + 1, sizeof(jchar));
if (strChars != NULL) {
(*env)->GetStringRegion(env, str, 0, (*env)->GetStringLength(env, str), strChars);
}
}
return strChars;
}
JNIEnv* NewtCommon_GetJNIEnv(int asDaemon, int * shallBeDetached) {
JNIEnv* curEnv = NULL;
JNIEnv* newEnv = NULL;
int envRes;
if(NULL==_jvmHandle) {
fprintf(stderr, "NEWT GetJNIEnv: NULL JVM handle, call NewtCommon_init 1st\n");
return NULL;
}
// retrieve this thread's JNIEnv curEnv - or detect it's detached
envRes = (*_jvmHandle)->GetEnv(_jvmHandle, (void **) &curEnv, _jvmVersion) ;
if( JNI_EDETACHED == envRes ) {
// detached thread - attach to JVM
if( asDaemon ) {
envRes = (*_jvmHandle)->AttachCurrentThreadAsDaemon(_jvmHandle, (void**) &newEnv, NULL);
} else {
envRes = (*_jvmHandle)->AttachCurrentThread(_jvmHandle, (void**) &newEnv, NULL);
}
if( JNI_OK != envRes ) {
fprintf(stderr, "NEWT GetJNIEnv: Can't attach thread: %d\n", envRes);
return NULL;
}
curEnv = newEnv;
} else if( JNI_OK != envRes ) {
// oops ..
fprintf(stderr, "NEWT GetJNIEnv: Can't GetEnv: %d\n", envRes);
return NULL;
}
if (curEnv==NULL) {
fprintf(stderr, "NEWT GetJNIEnv: env is NULL\n");
return NULL;
}
*shallBeDetached = NULL != newEnv;
return curEnv;
}
void NewtCommon_ReleaseJNIEnv (int shallBeDetached) {
if(NULL == _jvmHandle) {
fprintf(stderr, "NEWT ReleaseJNIEnv: No JavaVM handle registered, call NewtCommon_init(..) 1st");
} else if(shallBeDetached) {
(*_jvmHandle)->DetachCurrentThread(_jvmHandle);
}
}
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