content/browser/android/java/gin_java_method_invocation_helper.cc - platform/external/chromium_org - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "content/browser/android/java/gin_java_method_invocation_helper.h"

 #include <unistd.h>

 #include "base/android/event_log.h"
 #include "base/android/jni_android.h"
 #include "base/float_util.h"
 #include "content/browser/android/java/gin_java_script_to_java_types_coercion.h"
 #include "content/browser/android/java/java_method.h"
 #include "content/browser/android/java/jni_helper.h"
 #include "content/common/android/gin_java_bridge_value.h"
 #include "content/public/browser/browser_thread.h"
 #include "third_party/WebKit/public/platform/WebString.h"

 using base::android::AttachCurrentThread;
 using base::android::ScopedJavaLocalRef;

 namespace content {

 namespace {

 // See frameworks/base/core/java/android/webkit/EventLogTags.logtags
 const int kObjectGetClassInvocationAttemptLogTag = 70151;

 // This is an intermediate solution until we fix http://crbug.com/391492.
 std::string ConvertJavaStringToUTF8(JNIEnv* env, jstring str) {
   const jchar* chars = env->GetStringChars(str, NULL);
   DCHECK(chars);
   blink::WebString utf16(chars, env->GetStringLength(str));
   env->ReleaseStringChars(str, chars);
   return utf16.utf8();
 }

 }  // namespace

 GinJavaMethodInvocationHelper::GinJavaMethodInvocationHelper(
     scoped_ptr<ObjectDelegate> object,
     const std::string& method_name,
     const base::ListValue& arguments)
     : object_(object.Pass()),
       method_name_(method_name),
       arguments_(arguments.DeepCopy()),
       invocation_error_(kGinJavaBridgeNoError) {
 }

 GinJavaMethodInvocationHelper::~GinJavaMethodInvocationHelper() {}

 void GinJavaMethodInvocationHelper::Init(DispatcherDelegate* dispatcher) {
   // Build on the UI thread a map of object_id -> WeakRef for Java objects from
   // |arguments_|.  Then we can use this map on the background thread without
   // accessing |dispatcher|.
   BuildObjectRefsFromListValue(dispatcher, arguments_.get());
 }

 // As V8ValueConverter has finite recursion depth when serializing
 // JavaScript values, we don't bother about having a recursion threshold here.
 void GinJavaMethodInvocationHelper::BuildObjectRefsFromListValue(
     DispatcherDelegate* dispatcher,
     const base::Value* list_value) {
   DCHECK(list_value->IsType(base::Value::TYPE_LIST));
   const base::ListValue* list;
   list_value->GetAsList(&list);
   for (base::ListValue::const_iterator iter = list->begin();
        iter != list->end();
        ++iter) {
     if (AppendObjectRef(dispatcher, *iter))
       continue;
     if ((*iter)->IsType(base::Value::TYPE_LIST)) {
       BuildObjectRefsFromListValue(dispatcher, *iter);
     } else if ((*iter)->IsType(base::Value::TYPE_DICTIONARY)) {
       BuildObjectRefsFromDictionaryValue(dispatcher, *iter);
     }
   }
 }

 void GinJavaMethodInvocationHelper::BuildObjectRefsFromDictionaryValue(
     DispatcherDelegate* dispatcher,
     const base::Value* dict_value) {
   DCHECK(dict_value->IsType(base::Value::TYPE_DICTIONARY));
   const base::DictionaryValue* dict;
   dict_value->GetAsDictionary(&dict);
   for (base::DictionaryValue::Iterator iter(*dict);
        !iter.IsAtEnd();
        iter.Advance()) {
     if (AppendObjectRef(dispatcher, &iter.value()))
       continue;
     if (iter.value().IsType(base::Value::TYPE_LIST)) {
       BuildObjectRefsFromListValue(dispatcher, &iter.value());
     } else if (iter.value().IsType(base::Value::TYPE_DICTIONARY)) {
       BuildObjectRefsFromDictionaryValue(dispatcher, &iter.value());
     }
   }
 }

 bool GinJavaMethodInvocationHelper::AppendObjectRef(
     DispatcherDelegate* dispatcher,
     const base::Value* raw_value) {
   if (!GinJavaBridgeValue::ContainsGinJavaBridgeValue(raw_value))
     return false;
   scoped_ptr<const GinJavaBridgeValue> value(
       GinJavaBridgeValue::FromValue(raw_value));
   if (!value->IsType(GinJavaBridgeValue::TYPE_OBJECT_ID))
     return false;
   GinJavaBoundObject::ObjectID object_id;
   if (value->GetAsObjectID(&object_id)) {
     ObjectRefs::iterator iter = object_refs_.find(object_id);
     if (iter == object_refs_.end()) {
       JavaObjectWeakGlobalRef object_ref(
           dispatcher->GetObjectWeakRef(object_id));
       if (!object_ref.is_empty()) {
         object_refs_.insert(std::make_pair(object_id, object_ref));
       }
     }
   }
   return true;
 }

 void GinJavaMethodInvocationHelper::Invoke() {
   JNIEnv* env = AttachCurrentThread();
   const JavaMethod* method =
       object_->FindMethod(method_name_, arguments_->GetSize());
   if (!method) {
     SetInvocationError(kGinJavaBridgeMethodNotFound);
     return;
   }

   if (object_->IsObjectGetClassMethod(method)) {
     base::android::EventLogWriteInt(kObjectGetClassInvocationAttemptLogTag,
                                     getuid());
     SetInvocationError(kGinJavaBridgeAccessToObjectGetClassIsBlocked);
     return;
   }

   ScopedJavaLocalRef<jobject> obj;
   ScopedJavaLocalRef<jclass> cls;
   if (method->is_static()) {
     cls = object_->GetLocalClassRef(env);
   } else {
     obj = object_->GetLocalRef(env);
   }
   if (obj.is_null() && cls.is_null()) {
     SetInvocationError(kGinJavaBridgeObjectIsGone);
     return;
   }

   GinJavaBridgeError coercion_error = kGinJavaBridgeNoError;
   std::vector<jvalue> parameters(method->num_parameters());
   for (size_t i = 0; i < method->num_parameters(); ++i) {
     const base::Value* argument;
     arguments_->Get(i, &argument);
     parameters[i] = CoerceJavaScriptValueToJavaValue(env,
                                                      argument,
                                                      method->parameter_type(i),
                                                      true,
                                                      object_refs_,
                                                      &coercion_error);
   }

   if (coercion_error == kGinJavaBridgeNoError) {
     if (method->is_static()) {
       InvokeMethod(
           NULL, cls.obj(), method->return_type(), method->id(), &parameters[0]);
     } else {
       InvokeMethod(
           obj.obj(), NULL, method->return_type(), method->id(), &parameters[0]);
     }
   } else {
     SetInvocationError(coercion_error);
   }

   // Now that we're done with the jvalue, release any local references created
   // by CoerceJavaScriptValueToJavaValue().
   for (size_t i = 0; i < method->num_parameters(); ++i) {
     ReleaseJavaValueIfRequired(env, &parameters[i], method->parameter_type(i));
   }
 }

 void GinJavaMethodInvocationHelper::SetInvocationError(
     GinJavaBridgeError error) {
   holds_primitive_result_ = true;
   primitive_result_.reset(new base::ListValue());
   invocation_error_ = error;
 }

 void GinJavaMethodInvocationHelper::SetPrimitiveResult(
     const base::ListValue& result_wrapper) {
   holds_primitive_result_ = true;
   primitive_result_.reset(result_wrapper.DeepCopy());
 }

 void GinJavaMethodInvocationHelper::SetObjectResult(
     const base::android::JavaRef<jobject>& object,
     const base::android::JavaRef<jclass>& safe_annotation_clazz) {
   holds_primitive_result_ = false;
   object_result_.Reset(object);
   safe_annotation_clazz_.Reset(safe_annotation_clazz);
 }

 bool GinJavaMethodInvocationHelper::HoldsPrimitiveResult() {
   return holds_primitive_result_;
 }

 const base::ListValue& GinJavaMethodInvocationHelper::GetPrimitiveResult() {
   return *primitive_result_.get();
 }

 const base::android::JavaRef<jobject>&
 GinJavaMethodInvocationHelper::GetObjectResult() {
   return object_result_;
 }

 const base::android::JavaRef<jclass>&
 GinJavaMethodInvocationHelper::GetSafeAnnotationClass() {
   return safe_annotation_clazz_;
 }

 const GinJavaBridgeError GinJavaMethodInvocationHelper::GetInvocationError() {
   return invocation_error_;
 }

 void GinJavaMethodInvocationHelper::InvokeMethod(jobject object,
                                                  jclass clazz,
                                                  const JavaType& return_type,
                                                  jmethodID id,
                                                  jvalue* parameters) {
   DCHECK(object || clazz);
   JNIEnv* env = AttachCurrentThread();
   base::ListValue result_wrapper;
   switch (return_type.type) {
     case JavaType::TypeBoolean:
       result_wrapper.AppendBoolean(
           object ? env->CallBooleanMethodA(object, id, parameters)
                  : env->CallStaticBooleanMethodA(clazz, id, parameters));
       break;
     case JavaType::TypeByte:
       result_wrapper.AppendInteger(
           object ? env->CallByteMethodA(object, id, parameters)
                  : env->CallStaticByteMethodA(clazz, id, parameters));
       break;
     case JavaType::TypeChar:
       result_wrapper.AppendInteger(
           object ? env->CallCharMethodA(object, id, parameters)
                  : env->CallStaticCharMethodA(clazz, id, parameters));
       break;
     case JavaType::TypeShort:
       result_wrapper.AppendInteger(
           object ? env->CallShortMethodA(object, id, parameters)
                  : env->CallStaticShortMethodA(clazz, id, parameters));
       break;
     case JavaType::TypeInt:
       result_wrapper.AppendInteger(
           object ? env->CallIntMethodA(object, id, parameters)
                  : env->CallStaticIntMethodA(clazz, id, parameters));
       break;
     case JavaType::TypeLong:
       result_wrapper.AppendDouble(
           object ? env->CallLongMethodA(object, id, parameters)
                  : env->CallStaticLongMethodA(clazz, id, parameters));
       break;
     case JavaType::TypeFloat: {
       float result = object
                          ? env->CallFloatMethodA(object, id, parameters)
                          : env->CallStaticFloatMethodA(clazz, id, parameters);
       if (base::IsFinite(result)) {
         result_wrapper.AppendDouble(result);
       } else {
         result_wrapper.Append(
             GinJavaBridgeValue::CreateNonFiniteValue(result).release());
       }
       break;
     }
     case JavaType::TypeDouble: {
       double result = object
                           ? env->CallDoubleMethodA(object, id, parameters)
                           : env->CallStaticDoubleMethodA(clazz, id, parameters);
       if (base::IsFinite(result)) {
         result_wrapper.AppendDouble(result);
       } else {
         result_wrapper.Append(
             GinJavaBridgeValue::CreateNonFiniteValue(result).release());
       }
       break;
     }
     case JavaType::TypeVoid:
       if (object)
         env->CallVoidMethodA(object, id, parameters);
       else
         env->CallStaticVoidMethodA(clazz, id, parameters);
       result_wrapper.Append(
           GinJavaBridgeValue::CreateUndefinedValue().release());
       break;
     case JavaType::TypeArray:
       // LIVECONNECT_COMPLIANCE: Existing behavior is to not call methods that
       // return arrays. Spec requires calling the method and converting the
       // result to a JavaScript array.
       result_wrapper.Append(
           GinJavaBridgeValue::CreateUndefinedValue().release());
       break;
     case JavaType::TypeString: {
       jstring java_string = static_cast<jstring>(
           object ? env->CallObjectMethodA(object, id, parameters)
                  : env->CallStaticObjectMethodA(clazz, id, parameters));
       // If an exception was raised, we must clear it before calling most JNI
       // methods. ScopedJavaLocalRef is liable to make such calls, so we test
       // first.
       if (base::android::ClearException(env)) {
         SetInvocationError(kGinJavaBridgeJavaExceptionRaised);
         return;
       }
       ScopedJavaLocalRef<jstring> scoped_java_string(env, java_string);
       if (!scoped_java_string.obj()) {
         // LIVECONNECT_COMPLIANCE: Existing behavior is to return undefined.
         // Spec requires returning a null string.
         result_wrapper.Append(
             GinJavaBridgeValue::CreateUndefinedValue().release());
         break;
       }
       result_wrapper.AppendString(
           ConvertJavaStringToUTF8(env, scoped_java_string.obj()));
       break;
     }
     case JavaType::TypeObject: {
       // If an exception was raised, we must clear it before calling most JNI
       // methods. ScopedJavaLocalRef is liable to make such calls, so we test
       // first.
       jobject java_object =
           object ? env->CallObjectMethodA(object, id, parameters)
                  : env->CallStaticObjectMethodA(clazz, id, parameters);
       if (base::android::ClearException(env)) {
         SetInvocationError(kGinJavaBridgeJavaExceptionRaised);
         return;
       }
       ScopedJavaLocalRef<jobject> scoped_java_object(env, java_object);
       if (!scoped_java_object.obj()) {
         result_wrapper.Append(base::Value::CreateNullValue());
         break;
       }
       SetObjectResult(scoped_java_object, object_->GetSafeAnnotationClass());
       return;
     }
   }
   // This is for all cases except JavaType::TypeObject.
   if (!base::android::ClearException(env)) {
     SetPrimitiveResult(result_wrapper);
   } else {
     SetInvocationError(kGinJavaBridgeJavaExceptionRaised);
   }
 }

 }  // namespace content
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "content/browser/android/java/gin_java_method_invocation_helper.h"

	#include <unistd.h>

	#include "base/android/event_log.h"
	#include "base/android/jni_android.h"
	#include "base/float_util.h"
	#include "content/browser/android/java/gin_java_script_to_java_types_coercion.h"
	#include "content/browser/android/java/java_method.h"
	#include "content/browser/android/java/jni_helper.h"
	#include "content/common/android/gin_java_bridge_value.h"
	#include "content/public/browser/browser_thread.h"
	#include "third_party/WebKit/public/platform/WebString.h"

	using base::android::AttachCurrentThread;
	using base::android::ScopedJavaLocalRef;

	namespace content {

	namespace {

	// See frameworks/base/core/java/android/webkit/EventLogTags.logtags
	const int kObjectGetClassInvocationAttemptLogTag = 70151;

	// This is an intermediate solution until we fix http://crbug.com/391492.
	std::string ConvertJavaStringToUTF8(JNIEnv* env, jstring str) {
	const jchar* chars = env->GetStringChars(str, NULL);
	DCHECK(chars);
	blink::WebString utf16(chars, env->GetStringLength(str));
	env->ReleaseStringChars(str, chars);
	return utf16.utf8();
	}

	} // namespace

	GinJavaMethodInvocationHelper::GinJavaMethodInvocationHelper(
	scoped_ptr<ObjectDelegate> object,
	const std::string& method_name,
	const base::ListValue& arguments)
	: object_(object.Pass()),
	method_name_(method_name),
	arguments_(arguments.DeepCopy()),
	invocation_error_(kGinJavaBridgeNoError) {
	}

	GinJavaMethodInvocationHelper::~GinJavaMethodInvocationHelper() {}

	void GinJavaMethodInvocationHelper::Init(DispatcherDelegate* dispatcher) {
	// Build on the UI thread a map of object_id -> WeakRef for Java objects from
	// \|arguments_\|. Then we can use this map on the background thread without
	// accessing \|dispatcher\|.
	BuildObjectRefsFromListValue(dispatcher, arguments_.get());
	}

	// As V8ValueConverter has finite recursion depth when serializing
	// JavaScript values, we don't bother about having a recursion threshold here.
	void GinJavaMethodInvocationHelper::BuildObjectRefsFromListValue(
	DispatcherDelegate* dispatcher,
	const base::Value* list_value) {
	DCHECK(list_value->IsType(base::Value::TYPE_LIST));
	const base::ListValue* list;
	list_value->GetAsList(&list);
	for (base::ListValue::const_iterator iter = list->begin();
	iter != list->end();
	++iter) {
	if (AppendObjectRef(dispatcher, *iter))
	continue;
	if ((*iter)->IsType(base::Value::TYPE_LIST)) {
	BuildObjectRefsFromListValue(dispatcher, *iter);
	} else if ((*iter)->IsType(base::Value::TYPE_DICTIONARY)) {
	BuildObjectRefsFromDictionaryValue(dispatcher, *iter);
	}
	}
	}

	void GinJavaMethodInvocationHelper::BuildObjectRefsFromDictionaryValue(
	DispatcherDelegate* dispatcher,
	const base::Value* dict_value) {
	DCHECK(dict_value->IsType(base::Value::TYPE_DICTIONARY));
	const base::DictionaryValue* dict;
	dict_value->GetAsDictionary(&dict);
	for (base::DictionaryValue::Iterator iter(*dict);
	!iter.IsAtEnd();
	iter.Advance()) {
	if (AppendObjectRef(dispatcher, &iter.value()))
	continue;
	if (iter.value().IsType(base::Value::TYPE_LIST)) {
	BuildObjectRefsFromListValue(dispatcher, &iter.value());
	} else if (iter.value().IsType(base::Value::TYPE_DICTIONARY)) {
	BuildObjectRefsFromDictionaryValue(dispatcher, &iter.value());
	}
	}
	}

	bool GinJavaMethodInvocationHelper::AppendObjectRef(
	DispatcherDelegate* dispatcher,
	const base::Value* raw_value) {
	if (!GinJavaBridgeValue::ContainsGinJavaBridgeValue(raw_value))
	return false;
	scoped_ptr<const GinJavaBridgeValue> value(
	GinJavaBridgeValue::FromValue(raw_value));
	if (!value->IsType(GinJavaBridgeValue::TYPE_OBJECT_ID))
	return false;
	GinJavaBoundObject::ObjectID object_id;
	if (value->GetAsObjectID(&object_id)) {
	ObjectRefs::iterator iter = object_refs_.find(object_id);
	if (iter == object_refs_.end()) {
	JavaObjectWeakGlobalRef object_ref(
	dispatcher->GetObjectWeakRef(object_id));
	if (!object_ref.is_empty()) {
	object_refs_.insert(std::make_pair(object_id, object_ref));
	}
	}
	}
	return true;
	}

	void GinJavaMethodInvocationHelper::Invoke() {
	JNIEnv* env = AttachCurrentThread();
	const JavaMethod* method =
	object_->FindMethod(method_name_, arguments_->GetSize());
	if (!method) {
	SetInvocationError(kGinJavaBridgeMethodNotFound);
	return;
	}

	if (object_->IsObjectGetClassMethod(method)) {
	base::android::EventLogWriteInt(kObjectGetClassInvocationAttemptLogTag,
	getuid());
	SetInvocationError(kGinJavaBridgeAccessToObjectGetClassIsBlocked);
	return;
	}

	ScopedJavaLocalRef<jobject> obj;
	ScopedJavaLocalRef<jclass> cls;
	if (method->is_static()) {
	cls = object_->GetLocalClassRef(env);
	} else {
	obj = object_->GetLocalRef(env);
	}
	if (obj.is_null() && cls.is_null()) {
	SetInvocationError(kGinJavaBridgeObjectIsGone);
	return;
	}

	GinJavaBridgeError coercion_error = kGinJavaBridgeNoError;
	std::vector<jvalue> parameters(method->num_parameters());
	for (size_t i = 0; i < method->num_parameters(); ++i) {
	const base::Value* argument;
	arguments_->Get(i, &argument);
	parameters[i] = CoerceJavaScriptValueToJavaValue(env,
	argument,
	method->parameter_type(i),
	true,
	object_refs_,
	&coercion_error);
	}

	if (coercion_error == kGinJavaBridgeNoError) {
	if (method->is_static()) {
	InvokeMethod(
	NULL, cls.obj(), method->return_type(), method->id(), &parameters[0]);
	} else {
	InvokeMethod(
	obj.obj(), NULL, method->return_type(), method->id(), &parameters[0]);
	}
	} else {
	SetInvocationError(coercion_error);
	}

	// Now that we're done with the jvalue, release any local references created
	// by CoerceJavaScriptValueToJavaValue().
	for (size_t i = 0; i < method->num_parameters(); ++i) {
	ReleaseJavaValueIfRequired(env, &parameters[i], method->parameter_type(i));
	}
	}

	void GinJavaMethodInvocationHelper::SetInvocationError(
	GinJavaBridgeError error) {
	holds_primitive_result_ = true;
	primitive_result_.reset(new base::ListValue());
	invocation_error_ = error;
	}

	void GinJavaMethodInvocationHelper::SetPrimitiveResult(
	const base::ListValue& result_wrapper) {
	holds_primitive_result_ = true;
	primitive_result_.reset(result_wrapper.DeepCopy());
	}

	void GinJavaMethodInvocationHelper::SetObjectResult(
	const base::android::JavaRef<jobject>& object,
	const base::android::JavaRef<jclass>& safe_annotation_clazz) {
	holds_primitive_result_ = false;
	object_result_.Reset(object);
	safe_annotation_clazz_.Reset(safe_annotation_clazz);
	}

	bool GinJavaMethodInvocationHelper::HoldsPrimitiveResult() {
	return holds_primitive_result_;
	}

	const base::ListValue& GinJavaMethodInvocationHelper::GetPrimitiveResult() {
	return *primitive_result_.get();
	}

	const base::android::JavaRef<jobject>&
	GinJavaMethodInvocationHelper::GetObjectResult() {
	return object_result_;
	}

	const base::android::JavaRef<jclass>&
	GinJavaMethodInvocationHelper::GetSafeAnnotationClass() {
	return safe_annotation_clazz_;
	}

	const GinJavaBridgeError GinJavaMethodInvocationHelper::GetInvocationError() {
	return invocation_error_;
	}

	void GinJavaMethodInvocationHelper::InvokeMethod(jobject object,
	jclass clazz,
	const JavaType& return_type,
	jmethodID id,
	jvalue* parameters) {
	DCHECK(object \|\| clazz);
	JNIEnv* env = AttachCurrentThread();
	base::ListValue result_wrapper;
	switch (return_type.type) {
	case JavaType::TypeBoolean:
	result_wrapper.AppendBoolean(
	object ? env->CallBooleanMethodA(object, id, parameters)
	: env->CallStaticBooleanMethodA(clazz, id, parameters));
	break;
	case JavaType::TypeByte:
	result_wrapper.AppendInteger(
	object ? env->CallByteMethodA(object, id, parameters)
	: env->CallStaticByteMethodA(clazz, id, parameters));
	break;
	case JavaType::TypeChar:
	result_wrapper.AppendInteger(
	object ? env->CallCharMethodA(object, id, parameters)
	: env->CallStaticCharMethodA(clazz, id, parameters));
	break;
	case JavaType::TypeShort:
	result_wrapper.AppendInteger(
	object ? env->CallShortMethodA(object, id, parameters)
	: env->CallStaticShortMethodA(clazz, id, parameters));
	break;
	case JavaType::TypeInt:
	result_wrapper.AppendInteger(
	object ? env->CallIntMethodA(object, id, parameters)
	: env->CallStaticIntMethodA(clazz, id, parameters));
	break;
	case JavaType::TypeLong:
	result_wrapper.AppendDouble(
	object ? env->CallLongMethodA(object, id, parameters)
	: env->CallStaticLongMethodA(clazz, id, parameters));
	break;
	case JavaType::TypeFloat: {
	float result = object
	? env->CallFloatMethodA(object, id, parameters)
	: env->CallStaticFloatMethodA(clazz, id, parameters);
	if (base::IsFinite(result)) {
	result_wrapper.AppendDouble(result);
	} else {
	result_wrapper.Append(
	GinJavaBridgeValue::CreateNonFiniteValue(result).release());
	}
	break;
	}
	case JavaType::TypeDouble: {
	double result = object
	? env->CallDoubleMethodA(object, id, parameters)
	: env->CallStaticDoubleMethodA(clazz, id, parameters);
	if (base::IsFinite(result)) {
	result_wrapper.AppendDouble(result);
	} else {
	result_wrapper.Append(
	GinJavaBridgeValue::CreateNonFiniteValue(result).release());
	}
	break;
	}
	case JavaType::TypeVoid:
	if (object)
	env->CallVoidMethodA(object, id, parameters);
	else
	env->CallStaticVoidMethodA(clazz, id, parameters);
	result_wrapper.Append(
	GinJavaBridgeValue::CreateUndefinedValue().release());
	break;
	case JavaType::TypeArray:
	// LIVECONNECT_COMPLIANCE: Existing behavior is to not call methods that
	// return arrays. Spec requires calling the method and converting the
	// result to a JavaScript array.
	result_wrapper.Append(
	GinJavaBridgeValue::CreateUndefinedValue().release());
	break;
	case JavaType::TypeString: {
	jstring java_string = static_cast<jstring>(
	object ? env->CallObjectMethodA(object, id, parameters)
	: env->CallStaticObjectMethodA(clazz, id, parameters));
	// If an exception was raised, we must clear it before calling most JNI
	// methods. ScopedJavaLocalRef is liable to make such calls, so we test
	// first.
	if (base::android::ClearException(env)) {
	SetInvocationError(kGinJavaBridgeJavaExceptionRaised);
	return;
	}
	ScopedJavaLocalRef<jstring> scoped_java_string(env, java_string);
	if (!scoped_java_string.obj()) {
	// LIVECONNECT_COMPLIANCE: Existing behavior is to return undefined.
	// Spec requires returning a null string.
	result_wrapper.Append(
	GinJavaBridgeValue::CreateUndefinedValue().release());
	break;
	}
	result_wrapper.AppendString(
	ConvertJavaStringToUTF8(env, scoped_java_string.obj()));
	break;
	}
	case JavaType::TypeObject: {
	// If an exception was raised, we must clear it before calling most JNI
	// methods. ScopedJavaLocalRef is liable to make such calls, so we test
	// first.
	jobject java_object =
	object ? env->CallObjectMethodA(object, id, parameters)
	: env->CallStaticObjectMethodA(clazz, id, parameters);
	if (base::android::ClearException(env)) {
	SetInvocationError(kGinJavaBridgeJavaExceptionRaised);
	return;
	}
	ScopedJavaLocalRef<jobject> scoped_java_object(env, java_object);
	if (!scoped_java_object.obj()) {
	result_wrapper.Append(base::Value::CreateNullValue());
	break;
	}
	SetObjectResult(scoped_java_object, object_->GetSafeAnnotationClass());
	return;
	}
	}
	// This is for all cases except JavaType::TypeObject.
	if (!base::android::ClearException(env)) {
	SetPrimitiveResult(result_wrapper);
	} else {
	SetInvocationError(kGinJavaBridgeJavaExceptionRaised);
	}
	}

	} // namespace content