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Java: throw VideoException on error.

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This commit is contained in:
Peter Johnson
2016-11-18 01:13:15 -08:00
parent 29cd2b11be
commit 736b5ff424
2 changed files with 72 additions and 6 deletions
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58
java/lib/CameraServerJNI.cpp
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@@ -7,6 +7,7 @@
#include "edu_wpi_cscore_CameraServerJNI.h"
#include "llvm/raw_ostream.h"
#include "llvm/SmallString.h"
#include "support/jni_util.h"
@@ -23,6 +24,7 @@ static JavaVM *jvm = nullptr;
static jclass usbCameraInfoCls = nullptr;
static jclass videoModeCls = nullptr;
static jclass videoEventCls = nullptr;
static jclass videoExceptionCls = nullptr;
// Thread-attached environment for listener callbacks.
static JNIEnv *listenerEnv = nullptr;
@@ -76,6 +78,12 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) {
if (!videoEventCls) return JNI_ERR;
env->DeleteLocalRef(local);
local = env->FindClass("edu/wpi/cscore/VideoException");
if (!local) return JNI_ERR;
videoExceptionCls = static_cast<jclass>(env->NewGlobalRef(local));
if (!videoExceptionCls) return JNI_ERR;
env->DeleteLocalRef(local);
// Initial configuration of listener start/exit
cs::SetListenerOnStart(ListenerOnStart);
cs::SetListenerOnExit(ListenerOnExit);
@@ -91,6 +99,7 @@ JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *vm, void *reserved) {
if (usbCameraInfoCls) env->DeleteGlobalRef(usbCameraInfoCls);
if (videoModeCls) env->DeleteGlobalRef(videoModeCls);
if (videoEventCls) env->DeleteGlobalRef(videoEventCls);
if (videoExceptionCls) env->DeleteGlobalRef(videoEventCls);
jvm = nullptr;
}
@@ -127,14 +136,51 @@ class JGlobal {
T m_obj;
};
static void ReportError(JNIEnv *env, CS_Status status, bool do_throw = true) {
// TODO
static void ReportError(JNIEnv *env, CS_Status status) {
if (status == CS_OK) return;
static jmethodID constructor = nullptr;
if (!constructor)
constructor =
env->GetMethodID(videoExceptionCls, "<init>", "(Ljava/lang/String;)V");
llvm::SmallString<64> msg;
switch (status) {
case CS_PROPERTY_WRITE_FAILED:
msg = "property write failed";
break;
case CS_INVALID_HANDLE:
msg = "invalid handle";
break;
case CS_WRONG_HANDLE_SUBTYPE:
msg = "wrong handle subtype";
break;
case CS_INVALID_PROPERTY:
msg = "invalid property";
break;
case CS_WRONG_PROPERTY_TYPE:
msg = "wrong property type";
break;
case CS_READ_FAILED:
msg = "read failed";
break;
case CS_SOURCE_IS_DISCONNECTED:
msg = "source is disconnected";
break;
default: {
llvm::raw_svector_ostream oss{msg};
oss << "unknown error code=" << status;
break;
}
}
JLocal<jstring> msg_jstr{env, MakeJString(env, msg)};
jobject exception =
env->NewObject(videoExceptionCls, constructor, msg_jstr.obj());
env->Throw(static_cast<jthrowable>(exception));
}
static inline bool CheckStatus(JNIEnv *env, CS_Status status,
bool do_throw = true) {
if (status != 0) ReportError(env, status, do_throw);
return status == 0;
static inline bool CheckStatus(JNIEnv *env, CS_Status status) {
if (status != CS_OK) ReportError(env, status);
return status == CS_OK;
}
static jobject MakeJObject(JNIEnv *env, const cs::USBCameraInfo &info) {