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node-java/src/utils.cpp at master · NoamB/node-java · GitHub
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#
include
"
utils.h
"
#
include
<
string.h
>
#
include
<
algorithm
>
#
include
<
sstream
>
#
include
"
javaObject.h
"
#
include
"
java.h
"
#
define
MODIFIER_STATIC
9
std::list<jobject>
javaReflectionGetMethods
(JNIEnv *env, jclass clazz) {
std::list<jobject> results;
jclass clazzclazz = env->
GetObjectClass
(clazz);
jmethodID clazz_getMethods = env->
GetMethodID
(clazzclazz,
"
getMethods
"
,
"
()[Ljava/lang/reflect/Method;
"
);
jclass methodClazz = env->
FindClass
(
"
java/lang/reflect/Method
"
);
jmethodID method_getModifiers = env->
GetMethodID
(methodClazz,
"
getModifiers
"
,
"
()I
"
);
jobjectArray methodObjects = (jobjectArray)env->
CallObjectMethod
(clazz, clazz_getMethods);
jsize methodCount = env->
GetArrayLength
(methodObjects);
for
(jsize i=
0
; i<methodCount; i++) {
jobject method = env->
GetObjectArrayElement
(methodObjects, i);
jint methodModifiers = env->
CallIntMethod
(method, method_getModifiers);
if
((methodModifiers &
MODIFIER_STATIC
) ==
MODIFIER_STATIC
) {
continue
;
}
results.
push_back
(method);
}
return
results;
}
std::list<jobject>
javaReflectionGetFields
(JNIEnv *env, jclass clazz) {
std::list<jobject> results;
jclass clazzclazz = env->
GetObjectClass
(clazz);
jmethodID clazz_getFields = env->
GetMethodID
(clazzclazz,
"
getFields
"
,
"
()[Ljava/lang/reflect/Field;
"
);
jclass fieldClazz = env->
FindClass
(
"
java/lang/reflect/Field
"
);
jmethodID field_getModifiers = env->
GetMethodID
(fieldClazz,
"
getModifiers
"
,
"
()I
"
);
jobjectArray fieldObjects = (jobjectArray)env->
CallObjectMethod
(clazz, clazz_getFields);
jsize fieldCount = env->
GetArrayLength
(fieldObjects);
for
(jsize i=
0
; i<fieldCount; i++) {
jobject field = env->
GetObjectArrayElement
(fieldObjects, i);
jint fieldModifiers = env->
CallIntMethod
(field, field_getModifiers);
if
((fieldModifiers &
MODIFIER_STATIC
) ==
MODIFIER_STATIC
) {
continue
;
}
results.
push_back
(field);
}
return
results;
}
std::string
javaToString
(JNIEnv *env, jstring str) {
const
char
* chars = env->
GetStringUTFChars
(str,
NULL
);
std::string results = chars;
env->
ReleaseStringUTFChars
(str, chars);
return
results;
}
std::string
javaObjectToString
(JNIEnv *env, jobject obj) {
if
(obj ==
NULL
) {
return
"
(null)
"
;
}
jclass objClazz = env->
GetObjectClass
(obj);
jmethodID methodId = env->
GetMethodID
(objClazz,
"
toString
"
,
"
()Ljava/lang/String;
"
);
jstring result = (jstring)env->
CallObjectMethod
(obj, methodId);
return
javaToString
(env, result);
}
JNIEnv*
javaAttachCurrentThread
(JavaVM* jvm) {
JNIEnv* env;
JavaVMAttachArgs attachArgs;
attachArgs.
version
=
JNI_VERSION_1_4
;
attachArgs.
name
=
NULL
;
attachArgs.
group
=
NULL
;
jvm->
AttachCurrentThread
((
void
**)&env, &attachArgs);
return
env;
}
void
javaDetachCurrentThread
(JavaVM* jvm) {
jvm->
DetachCurrentThread
();
}
jvalueType
javaGetType
(JNIEnv *env, jclass type) {
jclass clazzClazz = env->
FindClass
(
"
java/lang/Class
"
);
jmethodID class_isArray = env->
GetMethodID
(clazzClazz,
"
isArray
"
,
"
()Z
"
);
jboolean isArray = env->
CallBooleanMethod
(type, class_isArray);
if
(isArray) {
return
TYPE_ARRAY
;
}
else
{
//
TODO: has to be a better way
std::string str =
javaObjectToString
(env, type);
const
char
*typeStr = str.
c_str
();
//
printf("javaGetType: %s\n", typeStr);
if
(
strcmp
(typeStr,
"
void
"
) ==
0
) {
return
TYPE_VOID
;
}
else
if
(
strcmp
(typeStr,
"
int
"
) ==
0
||
strcmp
(typeStr,
"
class java.lang.Integer
"
) ==
0
) {
return
TYPE_INT
;
}
else
if
(
strcmp
(typeStr,
"
double
"
) ==
0
||
strcmp
(typeStr,
"
class java.lang.Double
"
) ==
0
) {
return
TYPE_DOUBLE
;
}
else
if
(
strcmp
(typeStr,
"
long
"
) ==
0
||
strcmp
(typeStr,
"
class java.lang.Long
"
) ==
0
) {
return
TYPE_LONG
;
}
else
if
(
strcmp
(typeStr,
"
boolean
"
) ==
0
||
strcmp
(typeStr,
"
class java.lang.Boolean
"
) ==
0
) {
return
TYPE_BOOLEAN
;
}
else
if
(
strcmp
(typeStr,
"
byte
"
) ==
0
||
strcmp
(typeStr,
"
class java.lang.Byte
"
) ==
0
) {
return
TYPE_BYTE
;
}
else
if
(
strcmp
(typeStr,
"
class java.lang.String
"
) ==
0
) {
return
TYPE_STRING
;
}
return
TYPE_OBJECT
;
}
}
jclass
javaFindClass
(JNIEnv* env, std::string& className) {
std::string searchClassName = className;
std::replace
(searchClassName.
begin
(), searchClassName.
end
(),
'
.
'
,
'
/
'
);
//
Alternate find class trying to fix Class.forName
//
jclass threadClazz = env->FindClass("java/lang/Thread");
//
jmethodID thread_getCurrentThread = env->GetStaticMethodID(threadClazz, "currentThread", "()Ljava/lang/Thread;");
//
jmethodID thread_getContextClassLoader = env->GetMethodID(threadClazz, "getContextClassLoader", "()Ljava/lang/ClassLoader;");
//
//
jclass classLoaderClazz = env->FindClass("java/lang/ClassLoader");
//
jmethodID classLoader_loadClass = env->GetMethodID(classLoaderClazz, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;");
//
//
jobject currentThread = env->CallObjectMethod(threadClazz, thread_getCurrentThread);
//
jobject classLoader = env->CallObjectMethod(currentThread, thread_getContextClassLoader);
//
jstring searchClassNameJava = env->NewStringUTF(className.c_str());
//
jclass clazz = (jclass)env->CallObjectMethod(classLoader, classLoader_loadClass, searchClassNameJava);
jclass clazz = env->
FindClass
(searchClassName.
c_str
());
return
clazz;
}
jobject
javaFindField
(JNIEnv* env, jclass clazz, std::string& fieldName) {
jclass clazzclazz = env->
GetObjectClass
(clazz);
jclass fieldClazz = env->
FindClass
(
"
java/lang/reflect/Field
"
);
jmethodID field_getName = env->
GetMethodID
(fieldClazz,
"
getName
"
,
"
()Ljava/lang/String;
"
);
jmethodID class_getFields = env->
GetMethodID
(clazzclazz,
"
getFields
"
,
"
()[Ljava/lang/reflect/Field;
"
);
jobjectArray fieldObjects = (jobjectArray)env->
CallObjectMethod
(clazz, class_getFields);
jsize fieldCount = env->
GetArrayLength
(fieldObjects);
for
(jsize i=
0
; i<fieldCount; i++) {
jobject field = env->
GetObjectArrayElement
(fieldObjects, i);
std::string itFieldName =
javaToString
(env, (jstring)env->
CallObjectMethod
(field, field_getName));
if
(
strcmp
(itFieldName.
c_str
(), fieldName.
c_str
()) ==
0
) {
return
field;
}
}
return
NULL
;
}
jobject
v8ToJava
(JNIEnv* env, v8::Local<v8::Value> arg) {
if
(arg->
IsNull
() || arg->
IsUndefined
()) {
return
NULL
;
}
if
(arg->
IsArray
()) {
v8::Local<v8::Array> array =
v8::Array::Cast
(*arg);
uint32_t
arraySize = array->
Length
();
jclass objectClazz = env->
FindClass
(
"
java/lang/Object
"
);
jobjectArray result = env->
NewObjectArray
(arraySize, objectClazz,
NULL
);
for
(
uint32_t
i=
0
; i<arraySize; i++) {
jobject val =
v8ToJava
(env, array->
Get
(i));
env->
SetObjectArrayElement
(result, i, val);
}
return
result;
}
if
(arg->
IsString
()) {
v8::String::AsciiValue
val
(arg->
ToString
());
return
env->
NewStringUTF
(*val);
}
if
(arg->
IsInt32
() || arg->
IsUint32
()) {
jint val = arg->
ToInt32
()->
Value
();
jclass clazz = env->
FindClass
(
"
java/lang/Integer
"
);
jmethodID constructor = env->
GetMethodID
(clazz,
"
<init>
"
,
"
(I)V
"
);
return
env->
NewObject
(clazz, constructor, val);
}
if
(arg->
IsNumber
()) {
jdouble val = arg->
ToNumber
()->
Value
();
jclass clazz = env->
FindClass
(
"
java/lang/Double
"
);
jmethodID constructor = env->
GetMethodID
(clazz,
"
<init>
"
,
"
(D)V
"
);
return
env->
NewObject
(clazz, constructor, val);
}
if
(arg->
IsBoolean
()) {
jboolean val = arg->
ToBoolean
()->
Value
();
jclass clazz = env->
FindClass
(
"
java/lang/Boolean
"
);
jmethodID constructor = env->
GetMethodID
(clazz,
"
<init>
"
,
"
(Z)V
"
);
return
env->
NewObject
(clazz, constructor, val);
}
if
(arg->
IsObject
()) {
v8::Local<v8::Object> obj =
v8::Object::Cast
(*arg);
v8::String::AsciiValue
constructorName
(obj->
GetConstructorName
());
if
(
strcmp
(*constructorName,
"
JavaObject
"
) ==
0
) {
JavaObject* javaObject = node::ObjectWrap::Unwrap<JavaObject>(obj);
return
javaObject->
getObject
();
}
}
//
TODO: handle other arg types
v8::String::AsciiValue
typeStr
(arg);
printf
(
"
Unhandled type: %s
\n
"
, *typeStr);
return
NULL
;
}
jobjectArray
v8ToJava
(JNIEnv* env,
const
v8::Arguments& args,
int
start,
int
end) {
jclass clazz = env->
FindClass
(
"
java/lang/Object
"
);
jobjectArray results = env->
NewObjectArray
(end-start, clazz,
NULL
);
for
(
int
i=start; i<end; i++) {
jobject val =
v8ToJava
(env, args[i]);
env->
SetObjectArrayElement
(results, i - start, val);
}
return
results;
}
v8::Handle<v8::Value>
javaExceptionToV8
(JNIEnv* env, jthrowable ex,
const
std::string& alternateMessage) {
v8::HandleScope scope;
std::ostringstream msg;
msg << alternateMessage;
if
(ex) {
jclass stringWriterClazz = env->
FindClass
(
"
java/io/StringWriter
"
);
jmethodID stringWriter_constructor = env->
GetMethodID
(stringWriterClazz,
"
<init>
"
,
"
()V
"
);
jmethodID stringWriter_toString = env->
GetMethodID
(stringWriterClazz,
"
toString
"
,
"
()Ljava/lang/String;
"
);
jobject stringWriter = env->
NewObject
(stringWriterClazz, stringWriter_constructor);
jclass printWriterClazz = env->
FindClass
(
"
java/io/PrintWriter
"
);
jmethodID printWriter_constructor = env->
GetMethodID
(printWriterClazz,
"
<init>
"
,
"
(Ljava/io/Writer;)V
"
);
jobject printWriter = env->
NewObject
(printWriterClazz, printWriter_constructor, stringWriter);
jclass throwableClazz = env->
FindClass
(
"
java/lang/Throwable
"
);
jmethodID throwable_printStackTrace = env->
GetMethodID
(throwableClazz,
"
printStackTrace
"
,
"
(Ljava/io/PrintWriter;)V
"
);
env->
CallObjectMethod
(ex, throwable_printStackTrace, printWriter);
jstring strObj = (jstring)env->
CallObjectMethod
(stringWriter, stringWriter_toString);
std::string stackTrace =
javaToString
(env, strObj);
msg <<
"
\n
"
<< stackTrace;
}
return
scope.
Close
(
v8::Exception::Error
(
v8::String::New
(msg.
str
().
c_str
())));
}
v8::Handle<v8::Value>
javaExceptionToV8
(JNIEnv* env,
const
std::string& alternateMessage) {
v8::HandleScope scope;
jthrowable ex = env->
ExceptionOccurred
();
env->
ExceptionClear
();
return
scope.
Close
(
javaExceptionToV8
(env, ex, alternateMessage));
}
v8::Handle<v8::Value>
javaArrayToV8
(Java* java, JNIEnv* env, jobjectArray objArray) {
v8::HandleScope scope;
if
(objArray ==
NULL
) {
return
v8::Null
();
}
//
printf("javaArrayToV8: %d %s\n", javaObjectToString(env, objArray).c_str());
jsize arraySize = env->
GetArrayLength
(objArray);
//
printf("array size: %d\n", arraySize);
v8::Handle<v8::Array> result =
v8::Array::New
(arraySize);
for
(jsize i=
0
; i<arraySize; i++) {
jobject obj = env->
GetObjectArrayElement
(objArray, i);
v8::Handle<v8::Value> item =
javaToV8
(java, env, obj);
result->
Set
(i, item);
}
return
scope.
Close
(result);
}
v8::Handle<v8::Value>
javaToV8
(Java* java, JNIEnv* env, jobject obj) {
v8::HandleScope scope;
if
(obj ==
NULL
) {
return
v8::Null
();
}
jclass objClazz = env->
GetObjectClass
(obj);
jvalueType resultType =
javaGetType
(env, objClazz);
//
printf("javaToV8: %d %s\n", resultType, javaObjectToString(env, obj).c_str());
switch
(resultType) {
case
TYPE_ARRAY
:
{
v8::Handle<v8::Value> result =
javaArrayToV8
(java, env, (jobjectArray)obj);
return
scope.
Close
(result);
}
case
TYPE_VOID
:
return
v8::Undefined
();
case
TYPE_BOOLEAN
:
{
jclass booleanClazz = env->
FindClass
(
"
java/lang/Boolean
"
);
jmethodID boolean_booleanValue = env->
GetMethodID
(booleanClazz,
"
booleanValue
"
,
"
()Z
"
);
bool
result = env->
CallBooleanMethod
(obj, boolean_booleanValue);
return
scope.
Close
(
v8::Boolean::New
(result));
}
case
TYPE_BYTE
:
{
jclass byteClazz = env->
FindClass
(
"
java/lang/Byte
"
);
jmethodID byte_byteValue = env->
GetMethodID
(byteClazz,
"
byteValue
"
,
"
()B
"
);
jbyte result = env->
CallByteMethod
(obj, byte_byteValue);
return
scope.
Close
(
v8::Number::New
(result));
}
case
TYPE_LONG
:
{
jclass longClazz = env->
FindClass
(
"
java/lang/Long
"
);
jmethodID long_longValue = env->
GetMethodID
(longClazz,
"
longValue
"
,
"
()J
"
);
jlong result = env->
CallLongMethod
(obj, long_longValue);
return
scope.
Close
(
v8::Number::New
(result));
}
case
TYPE_INT
:
{
jclass integerClazz = env->
FindClass
(
"
java/lang/Integer
"
);
jmethodID integer_intValue = env->
GetMethodID
(integerClazz,
"
intValue
"
,
"
()I
"
);
jint result = env->
CallIntMethod
(obj, integer_intValue);
return
scope.
Close
(
v8::Integer::New
(result));
}
case
TYPE_DOUBLE
:
{
jclass doubleClazz = env->
FindClass
(
"
java/lang/Double
"
);
jmethodID double_doubleValue = env->
GetMethodID
(doubleClazz,
"
doubleValue
"
,
"
()D
"
);
jdouble result = env->
CallDoubleMethod
(obj, double_doubleValue);
return
scope.
Close
(
v8::Number::New
(result));
}
case
TYPE_STRING
:
return
scope.
Close
(
v8::String::New
(
javaObjectToString
(env, obj).
c_str
()));
case
TYPE_OBJECT
:
return
scope.
Close
(
JavaObject::New
(java, obj));
default
:
printf
(
"
unhandled type: 0x%03x
\n
"
, resultType);
return
scope.
Close
(
JavaObject::New
(java, obj));
}
return
v8::Undefined
();
}
jobjectArray
javaObjectArrayToClasses
(JNIEnv *env, jobjectArray objs) {
jclass clazzClazz = env->
FindClass
(
"
java/lang/Class
"
);
jsize objsLength = env->
GetArrayLength
(objs);
jobjectArray results = env->
NewObjectArray
(objsLength, clazzClazz,
NULL
);
for
(jsize i=
0
; i<objsLength; i++) {
jobject elem = env->
GetObjectArrayElement
(objs, i);
if
(elem ==
NULL
) {
env->
SetObjectArrayElement
(results, i,
NULL
);
}
else
{
jclass objClazz = env->
GetObjectClass
(elem);
env->
SetObjectArrayElement
(results, i, objClazz);
}
}
return
results;
}
jobject
javaFindMethod
(JNIEnv *env, jclass clazz, std::string& methodName, jobjectArray methodArgs) {
jclass methodUtilsClazz = env->
FindClass
(
"
com/nearinfinity/org/apache/commons/lang3/reflect/MethodUtils
"
);
jmethodID methodUtils_getMatchingAccessibleMethod = env->
GetStaticMethodID
(methodUtilsClazz,
"
getMatchingAccessibleMethod
"
,
"
(Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
"
);
const
char
*methodNameCStr = methodName.
c_str
();
jstring methodNameJavaStr = env->
NewStringUTF
(methodNameCStr);
jobjectArray methodArgClasses =
javaObjectArrayToClasses
(env, methodArgs);
jobject method = env->
CallStaticObjectMethod
(methodUtilsClazz, methodUtils_getMatchingAccessibleMethod, clazz, methodNameJavaStr, methodArgClasses);
return
method;
}
jobject
javaFindConstructor
(JNIEnv *env, jclass clazz, jobjectArray methodArgs) {
jclass constructorUtilsClazz = env->
FindClass
(
"
com/nearinfinity/org/apache/commons/lang3/reflect/ConstructorUtils
"
);
jmethodID constructorUtils_getMatchingAccessibleConstructor = env->
GetStaticMethodID
(constructorUtilsClazz,
"
getMatchingAccessibleConstructor
"
,
"
(Ljava/lang/Class;[Ljava/lang/Class;)Ljava/lang/reflect/Constructor;
"
);
jobjectArray methodArgClasses =
javaObjectArrayToClasses
(env, methodArgs);
jobject method = env->
CallStaticObjectMethod
(constructorUtilsClazz, constructorUtils_getMatchingAccessibleConstructor, clazz, methodArgClasses);
return
method;
}
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