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Bug 1200343 - Add JNI wrapper for object arrays; r=snorp

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This patch adds a specialization for jni::Ref<jni::ObjectArray>, which
includes members for getting the length of the array and accessing
array elements.
This commit is contained in:
Jim Chen 2015-09-28 12:07:09 -04:00
parent 4f600bb5fb
commit e016c0a80e
1 changed files with 72 additions and 1 deletions
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73
widget/android/jni/Refs.h
View File

@ -8,6 +8,7 @@
#include "nsError.h" // for nsresult
#include "nsString.h"
#include "nsTArray.h"
namespace mozilla {
namespace jni {
@ -541,6 +542,76 @@ public:
};
// Ref specialization for jobjectArray.
template<>
class Ref<ObjectArray> : public RefBase<ObjectArray, jobjectArray>
{
friend class RefBase<ObjectArray, jobjectArray>;
friend class detail::TypeAdapter<Ref<ObjectArray>>;
typedef RefBase<ObjectArray, jobjectArray> Base;
protected:
Ref(jobject instance) : Base(instance) {}
Ref(const Ref& ref) : Base(ref.mInstance) {}
public:
MOZ_IMPLICIT Ref(decltype(nullptr)) : Base(nullptr) {}
// Get the length of the object array.
size_t Length() const
{
MOZ_ASSERT(ObjectArray::mInstance);
JNIEnv* const env = GetEnvForThread();
const size_t ret = env->GetArrayLength(jarray(ObjectArray::mInstance));
HandleUncaughtException(env);
return ret;
}
Object::LocalRef GetElement(size_t index) const
{
MOZ_ASSERT(ObjectArray::mInstance);
JNIEnv* const env = GetEnvForThread();
auto ret = Object::LocalRef::Adopt(env, env->GetObjectArrayElement(
jobjectArray(ObjectArray::mInstance), jsize(index)));
HandleUncaughtException(env);
return ret;
}
nsTArray<Object::LocalRef> GetElements() const
{
MOZ_ASSERT(ObjectArray::mInstance);
JNIEnv* const env = GetEnvForThread();
const jsize len = size_t(env->GetArrayLength(
jarray(ObjectArray::mInstance)));
nsTArray<Object::LocalRef> array((size_t(len)));
for (jsize i = 0; i < len; i++) {
array.AppendElement(Object::LocalRef::Adopt(
env, env->GetObjectArrayElement(
jobjectArray(ObjectArray::mInstance), i)));
HandleUncaughtException(env);
}
return array;
}
operator nsTArray<Object::LocalRef>() const
{
return GetElements();
}
void SetElement(size_t index, Object::Param element) const
{
MOZ_ASSERT(ObjectArray::mInstance);
JNIEnv* const env = GetEnvForThread();
env->SetObjectArrayElement(jobjectArray(ObjectArray::mInstance),
jsize(index), element.Get());
HandleUncaughtException(env);
}
};
// Ref specialization for jstring.
template<>
class Ref<String> : public RefBase<String, jstring>
@ -548,7 +619,7 @@ class Ref<String> : public RefBase<String, jstring>
friend class RefBase<String, jstring>;
friend struct detail::TypeAdapter<Ref<String>>;
typedef RefBase<TypedObject<jstring>, jstring> Base;
typedef RefBase<String, jstring> Base;
protected:
Ref(jobject instance) : Base(instance) {}