Chris@0: 
Chris@0: #ifndef _HANDLE_H_INCLUDED_
Chris@0: #define _HANDLE_H_INCLUDED_
Chris@0: 
Chris@0: inline jfieldID getHandleField(JNIEnv *env, jobject obj)
Chris@0: {
Chris@0:     jclass c = env->GetObjectClass(obj);
Chris@0:     return env->GetFieldID(c, "nativeHandle", "J");
Chris@0: }
Chris@0: 
Chris@0: template <typename T>
Chris@0: T *getHandle(JNIEnv *env, jobject obj)
Chris@0: {
Chris@0:     jlong handle = env->GetLongField(obj, getHandleField(env, obj));
Chris@0:     return reinterpret_cast<T *>(handle);
Chris@0: }
Chris@0: 
Chris@0: template <typename T>
Chris@0: void setHandle(JNIEnv *env, jobject obj, T *t)
Chris@0: {
Chris@0:     jlong handle = reinterpret_cast<jlong>(t);
Chris@0:     env->SetLongField(obj, getHandleField(env, obj), handle);
Chris@0: }
Chris@0: 
Chris@0: #endif