JavaClass_newEnumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JavaMemberDescriptor *member_descriptor;
JavaClassDescriptor *class_descriptor;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
class_descriptor = JS_GetPrivate(cx, obj);
/* Check for prototype JavaClass object */
if (!class_descriptor) {
*statep = JSVAL_NULL;
if (idp)
*idp = INT_TO_JSVAL(0);
return JS_TRUE;
}
switch(enum_op) {
case JSENUMERATE_INIT:
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
member_descriptor = jsj_GetClassStaticMembers(cx, jEnv, class_descriptor);
*statep = PRIVATE_TO_JSVAL(member_descriptor);
if (idp)
*idp = INT_TO_JSVAL(class_descriptor->num_instance_members);
jsj_ExitJava(jsj_env);
return JS_TRUE;
case JSENUMERATE_NEXT:
member_descriptor = JSVAL_TO_PRIVATE(*statep);
if (member_descriptor) {
/* Don't enumerate explicit-signature methods, i.e. enumerate toValue,
but not toValue(int), toValue(double), etc. */
while (member_descriptor->methods && member_descriptor->methods->is_alias) {
member_descriptor = member_descriptor->next;
if (!member_descriptor) {
*statep = JSVAL_NULL;
return JS_TRUE;
}
}
*idp = member_descriptor->id;
*statep = PRIVATE_TO_JSVAL(member_descriptor->next);
return JS_TRUE;
}
/* Fall through ... */
case JSENUMERATE_DESTROY:
*statep = JSVAL_NULL;
return JS_TRUE;
default:
JS_ASSERT(0);
return JS_FALSE;
}
}
static JSBool
JavaArray_lookupProperty(JSContext *cx, JSObject *obj, jsid id,
JSObject **objp, JSProperty **propp)
{
JNIEnv *jEnv;
JSErrorReporter old_reporter;
JSJavaThreadState *jsj_env;
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
old_reporter = JS_SetErrorReporter(cx, NULL);
if (access_java_array_element(cx, jEnv, obj, id, NULL, JS_FALSE)) {
*objp = obj;
*propp = (JSProperty*)1;
js_SetObjectWeakRoot(cx, obj);
} else {
*objp = NULL;
*propp = NULL;
}
JS_SetErrorReporter(cx, old_reporter);
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
JavaClass_lookupProperty(JSContext *cx, JSObject *obj, jsid id,
JSObject **objp, JSProperty **propp
#if defined JS_THREADSAFE && defined DEBUG
, const char *file, uintN line
#endif
)
{
JNIEnv *jEnv;
JSErrorReporter old_reporter;
JSJavaThreadState *jsj_env;
/* printf("In JavaClass_lookupProperty()\n"); */
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
old_reporter = JS_SetErrorReporter(cx, NULL);
if (lookup_static_member_by_id(cx, jEnv, obj, NULL, id, NULL)) {
*objp = obj;
*propp = (JSProperty*)1;
} else {
*objp = NULL;
*propp = NULL;
}
JS_SetErrorReporter(cx, old_reporter);
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
JavaClass_hasInstance(JSContext *cx, JSObject *obj, jsval candidate_jsval,
JSBool *has_instancep)
{
JavaClassDescriptor *class_descriptor;
JavaObjectWrapper *java_wrapper;
JSClass *js_class;
JSBool has_instance;
JSObject *candidate_obj;
jclass java_class;
jobject java_obj;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
has_instance = JS_FALSE;
class_descriptor = JS_GetPrivate(cx, obj);
if (!class_descriptor) {
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_BAD_OP_JCLASS);
return JS_FALSE;
}
/*
* Make sure that the thing to the left of the instanceof operator is a
* Java object.
*/
if (!JSVAL_IS_OBJECT(candidate_jsval))
goto done;
candidate_obj = JSVAL_TO_OBJECT(candidate_jsval);
#ifdef JS_THREADSAFE
js_class = JS_GetClass(cx, candidate_obj);
#else
js_class = JS_GetClass(candidate_obj);
#endif
if ((js_class != &JavaObject_class) && (js_class != &JavaArray_class))
goto done;
java_class = class_descriptor->java_class;
java_wrapper = JS_GetPrivate(cx, candidate_obj);
if (!java_wrapper) {
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_BAD_OP_PROTO);
return JS_FALSE;
}
java_obj = java_wrapper->java_obj;
/* Get JNI pointer */
jsj_env = jsj_EnterJava(cx, &jEnv);
has_instance = (*jEnv)->IsInstanceOf(jEnv, java_obj, java_class);
jsj_ExitJava(jsj_env);
done:
*has_instancep = has_instance;
return JS_TRUE;
}
static JSBool
JavaArray_setPropertyById(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
JSBool result;
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
result = access_java_array_element(cx, jEnv, obj, id, vp, JS_TRUE);
jsj_ExitJava(jsj_env);
return result;
}
JavaClass_setPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
jclass java_class;
const char *member_name;
JavaClassDescriptor *class_descriptor;
JavaMemberDescriptor *member_descriptor;
jsval idval;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
JSBool result;
/* printf("In JavaClass_setProperty\n"); */
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
if (!lookup_static_member_by_id(cx, jEnv, obj, &class_descriptor, id, &member_descriptor)) {
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
/* Check for the case where there is a method with the given name, but no field
with that name */
if (!member_descriptor->field)
goto no_such_field;
/* Silently fail if field value is final (immutable), as required by ECMA spec */
if (member_descriptor->field->modifiers & ACC_FINAL) {
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
java_class = class_descriptor->java_class;
result = jsj_SetJavaFieldValue(cx, jEnv, member_descriptor->field, java_class, *vp);
jsj_ExitJava(jsj_env);
return result;
no_such_field:
JS_IdToValue(cx, id, &idval);
member_name = JS_GetStringBytes(JSVAL_TO_STRING(idval));
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_MISSING_STATIC,
member_name, class_descriptor->name);
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
/* Utility routine to wrap a Java object inside a JS object, having a
a result type of either JavaObject or JavaArray. */
JSBool
JSJ_ConvertJavaObjectToJSValue(JSContext *cx, jobject java_obj, jsval *vp)
{
JNIEnv *jEnv;
JSBool result;
JSJavaThreadState *jsj_env;
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
result = jsj_ConvertJavaObjectToJSValue(cx, jEnv, java_obj, vp);
jsj_ExitJava(jsj_env);
return result;
}
JavaClass_finalize(JSContext *cx, JSObject *obj)
{
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
JavaClassDescriptor *class_descriptor = JS_GetPrivate(cx, obj);
if (!class_descriptor)
return;
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return;
/* printf("Finalizing %s\n", class_descriptor->name); */
jsj_ReleaseJavaClassDescriptor(cx, jEnv, class_descriptor);
jsj_ExitJava(jsj_env);
}
JavaClass_construct(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSObject *obj_arg, *JavaClass_obj;
JavaObjectWrapper *java_wrapper;
JavaClassDescriptor *class_descriptor;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
if (argc != 1 ||
!JSVAL_IS_OBJECT(argv[0]) ||
!(obj_arg = JSVAL_TO_OBJECT(argv[0])) ||
!JS_InstanceOf(cx, obj_arg, &JavaObject_class, 0) ||
((java_wrapper = JS_GetPrivate(cx, obj_arg)) == NULL)) {
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_NEED_JCLASS_ARG);
return JS_FALSE;
}
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
class_descriptor = java_wrapper->class_descriptor;
if (!(*jEnv)->IsSameObject(jEnv, class_descriptor->java_class, jlClass)) {
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_NEED_JCLASS_ARG);
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
class_descriptor = jsj_GetJavaClassDescriptor(cx, jEnv, java_wrapper->java_obj);
JavaClass_obj = jsj_new_JavaClass(cx, jEnv, NULL, class_descriptor);
if (!JavaClass_obj) {
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
*rval = OBJECT_TO_JSVAL(JavaClass_obj);
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
getClass(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSObject *obj_arg, *JavaClass_obj;
JavaObjectWrapper *java_wrapper;
JavaClassDescriptor *class_descriptor;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
if (argc != 1 ||
!JSVAL_IS_OBJECT(argv[0]) ||
!(obj_arg = JSVAL_TO_OBJECT(argv[0])) ||
(!JS_InstanceOf(cx, obj_arg, &JavaObject_class, 0) &&
!JS_InstanceOf(cx, obj_arg, &JavaArray_class, 0))) {
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_NEED_JOBJECT_ARG);
return JS_FALSE;
}
java_wrapper = JS_GetPrivate(cx, obj_arg);
if (!java_wrapper) {
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_PROTO_GETCLASS);
return JS_FALSE;
}
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
class_descriptor = java_wrapper->class_descriptor;
JavaClass_obj = jsj_new_JavaClass(cx, jEnv, NULL, class_descriptor);
if (!JavaClass_obj) {
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
*rval = OBJECT_TO_JSVAL(JavaClass_obj);
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
static JSBool
JavaArray_newEnumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JavaObjectWrapper *java_wrapper;
JSJavaThreadState *jsj_env;
JNIEnv *jEnv;
jsize array_length, index;
JSBool ok = JS_TRUE;
java_wrapper = JS_GetPrivate(cx, obj);
/* Check for prototype object */
if (!java_wrapper) {
*statep = JSVAL_NULL;
if (idp)
*idp = INT_TO_JSVAL(0);
return JS_TRUE;
}
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
array_length = jsj_GetJavaArrayLength(cx, jEnv, java_wrapper->java_obj);
if (array_length < 0) {
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
switch(enum_op) {
case JSENUMERATE_INIT:
*statep = INT_TO_JSVAL(0);
if (idp)
*idp = INT_TO_JSVAL(array_length);
break;
case JSENUMERATE_NEXT:
index = JSVAL_TO_INT(*statep);
if (index < array_length) {
JS_ValueToId(cx, INT_TO_JSVAL(index), idp);
index++;
*statep = INT_TO_JSVAL(index);
break;
}
/* Fall through ... */
case JSENUMERATE_DESTROY:
*statep = JSVAL_NULL;
break;
default:
JS_ASSERT(0);
ok = JS_FALSE;
break;
}
jsj_ExitJava(jsj_env);
return ok;
}
capture_js_error_reports_for_java(JSContext *cx, const char *message,
JSErrorReport *report)
{
CapturedJSError *new_error;
JSJavaThreadState *jsj_env;
jthrowable java_exception, tmp_exception;
JNIEnv *jEnv;
/* Warnings are not propagated as Java exceptions - they are simply
ignored. Ditto for exceptions that are duplicated in the form
of error reports. */
if (report && (report->flags & (JSREPORT_WARNING | JSREPORT_EXCEPTION)))
return;
/* Create an empty struct to hold the saved JS error state */
new_error = malloc(sizeof(CapturedJSError));
if (!new_error)
goto out_of_memory;
memset(new_error, 0, sizeof(CapturedJSError));
/* Copy all the error info out of the original report into a private copy */
if (message) {
new_error->message = strdup(message);
if (!new_error->message)
goto out_of_memory;
}
if (report) {
new_error->report.lineno = report->lineno;
if (report->filename) {
new_error->report.filename = strdup(report->filename);
if (!new_error->report.filename)
goto out_of_memory;
}
if (report->linebuf) {
new_error->report.linebuf = strdup(report->linebuf);
if (!new_error->report.linebuf)
goto out_of_memory;
new_error->report.tokenptr =
new_error->report.linebuf + (report->tokenptr - report->linebuf);
}
}
/* Get the head of the list of pending JS errors */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jsj_env)
goto abort;
/* If there's a Java exception associated with this error, save it too. */
java_exception = (*jEnv)->ExceptionOccurred(jEnv);
if (java_exception) {
(*jEnv)->ExceptionClear(jEnv);
tmp_exception = java_exception; /* Make a copy */
java_exception = (*jEnv)->NewGlobalRef(jEnv, java_exception);
new_error->java_exception = java_exception;
(*jEnv)->DeleteLocalRef(jEnv, tmp_exception);
}
/* Push this error onto the list of pending JS errors */
new_error->next = jsj_env->pending_js_errors;
jsj_env->pending_js_errors = new_error;
jsj_ExitJava(jsj_env);
return;
abort:
out_of_memory:
/* No recovery action possible */
JS_ASSERT(0);
destroy_saved_js_error(jEnv, new_error);
return;
}
JavaPackage_resolve(JSContext *cx, JSObject *obj, jsval id)
{
JavaPackage_Private *package;
JSBool ok = JS_TRUE;
jclass jclazz;
char *subPath, *newPath;
const char *path;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
/* Painful hack for pre_define_java_packages() */
if (quiet_resolve_failure)
return JS_FALSE;
package = (JavaPackage_Private *)JS_GetPrivate(cx, obj);
if (!package)
return JS_TRUE;
if (!JSVAL_IS_STRING(id))
return JS_TRUE;
subPath = JS_GetStringBytes(JSVAL_TO_STRING(id));
/*
* There will be an attempt to invoke the toString() method when producing
* the string representation of a JavaPackage. When this occurs, avoid
* creating a bogus toString package. (This means that no one can ever
* create a package with the simple name "toString", but we'll live with
* that limitation.)
*/
if (!strcmp(subPath, "toString"))
return JS_FALSE;
path = package->path;
newPath = JS_smprintf("%s%s%s", path, (path[0] ? "/" : ""), subPath);
if (!newPath) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv) {
ok = JS_FALSE;
goto out;
}
/*
Unfortunately, Java provides no way to find out whether a particular
name is a package or not. The only way to tell is to try to load the
name as a class file and, if that fails, assume it's a package. This
makes things work as expected for the most part, but it has three
noticeable problems that keep coming up:
- You can refer to a package like java.lang.i.buried.paul without
generating a complaint. Of course, you'll never be able to refer to
any classes through it.
- An annoying consequence of the above is that misspelling a class name
results in a cryptic error about packages.
- In a browser context, i.e. where applets are involved, figuring out
whether something is a class may require looking for it over the net
using the current classloader. This means that the first time you
refer to java.lang.System in a js context, there will be an attempt
to search for [[DOCBASE]]/java.class on the server.
A solution is to explicitly tell jsjava the names of all the (local)
packages on the CLASSPATH. (Not implemented yet.)
*/
jclazz = (*jEnv)->FindClass(jEnv, newPath);
if (jclazz) {
JSObject *newClass;
newClass = jsj_define_JavaClass(cx, jEnv, obj, subPath, jclazz);
(*jEnv)->DeleteLocalRef(jEnv, jclazz);
if (!newClass) {
ok = JS_FALSE;
goto out;
}
} else {
/* We assume that any failed attempt to load a class is because it
doesn't exist. If we wanted to do a better job, we would check
the exception type and make sure that it's NoClassDefFoundError */
(*jEnv)->ExceptionClear(jEnv);
/*
* If there's no class of the given name, then we must be referring to
* a package. However, don't allow bogus sub-packages of pre-defined
* system packages to be created.
*/
if (JS_InstanceOf(cx, obj, &JavaPackage_class, NULL)) {
JavaPackage_Private *current_package;
current_package = JS_GetPrivate(cx, obj);
if (current_package->flags & PKG_SYSTEM) {
char *msg, *cp;
msg = JS_strdup(cx, newPath);
/* Check for OOM */
if (msg) {
/* Convert package of form "java/lang" to "java.lang" */
for (cp = msg; *cp != '\0'; cp++)
if (*cp == '/')
*cp = '.';
JS_ReportErrorNumber(cx, jsj_GetErrorMessage, NULL,
JSJMSG_MISSING_PACKAGE, msg);
free((char*)msg);
}
ok = JS_FALSE;
goto out;
}
}
if (!define_JavaPackage(cx, obj, subPath, newPath, 0, JSPROP_READONLY)) {
ok = JS_FALSE;
goto out;
}
#ifdef DEBUG
/* printf("JavaPackage \'%s\' created\n", newPath); */
#endif
}
out:
free(newPath);
jsj_ExitJava(jsj_env);
return ok;
}
JavaClass_getPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
jsval idval;
jclass java_class;
const char *member_name;
JavaClassDescriptor *class_descriptor;
JavaMemberDescriptor *member_descriptor;
JNIEnv *jEnv;
JSJavaThreadState *jsj_env;
JSBool result;
/* printf("In JavaClass_getProperty\n"); */
/* Get the Java per-thread environment pointer for this JSContext */
jsj_env = jsj_EnterJava(cx, &jEnv);
if (!jEnv)
return JS_FALSE;
if (!lookup_static_member_by_id(cx, jEnv, obj, &class_descriptor, id, &member_descriptor)) {
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
if (!member_descriptor) {
*vp = JSVAL_VOID;
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
java_class = class_descriptor->java_class;
if (member_descriptor->field) {
if (!member_descriptor->methods) {
result = jsj_GetJavaFieldValue(cx, jEnv, member_descriptor->field, java_class, vp);
jsj_ExitJava(jsj_env);
return result;
} else {
JS_ASSERT(0);
}
} else {
JSFunction *function;
/* TODO - eliminate JSFUN_BOUND_METHOD */
if (member_descriptor->methods->is_alias) {
/* If this is an explicit resolution of an overloaded method,
use the fully-qualified method name as the name of the
resulting JS function, i.e. "myMethod(int,long)" */
JS_IdToValue(cx, id, &idval);
member_name = JS_GetStringBytes(JSVAL_TO_STRING(idval));
} else {
/* Either not explicit resolution of overloaded method or
explicit resolution was unnecessary because method was
not overloaded. */
member_name = member_descriptor->name;
}
function = JS_NewFunction(cx, jsj_JavaStaticMethodWrapper, 0,
JSFUN_BOUND_METHOD, obj, member_name);
if (!function) {
jsj_ExitJava(jsj_env);
return JS_FALSE;
}
*vp = OBJECT_TO_JSVAL(JS_GetFunctionObject(function));
}
jsj_ExitJava(jsj_env);
return JS_TRUE;
}
