Measure the text before doing line break
Bug: 65024629
Test: N/A
Change-Id: Ifa7be17b87687f95f045de1409fb554991269ebc
diff --git a/core/jni/scoped_nullable_primitive_array.h b/core/jni/scoped_nullable_primitive_array.h
new file mode 100644
index 0000000..77f4c9d
--- /dev/null
+++ b/core/jni/scoped_nullable_primitive_array.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SCOPED_NULLABLE_PRIMITIVE_ARRAY_H
+#define SCOPED_NULLABLE_PRIMITIVE_ARRAY_H
+
+#include <jni.h>
+
+namespace android {
+
+#define ARRAY_TRAITS(ARRAY_TYPE, POINTER_TYPE, NAME) \
+class NAME ## ArrayTraits { \
+public: \
+ static constexpr void getArrayRegion(JNIEnv* env, ARRAY_TYPE array, size_t start, \
+ size_t len, POINTER_TYPE out) { \
+ env->Get ## NAME ## ArrayRegion(array, start, len, out); \
+ } \
+ \
+ static constexpr POINTER_TYPE getArrayElements(JNIEnv* env, ARRAY_TYPE array) { \
+ return env->Get ## NAME ## ArrayElements(array, nullptr); \
+ } \
+ \
+ static constexpr void releaseArrayElements(JNIEnv* env, ARRAY_TYPE array, \
+ POINTER_TYPE buffer, jint mode) { \
+ env->Release ## NAME ## ArrayElements(array, buffer, mode); \
+ } \
+}; \
+
+ARRAY_TRAITS(jbooleanArray, jboolean*, Boolean)
+ARRAY_TRAITS(jbyteArray, jbyte*, Byte)
+ARRAY_TRAITS(jcharArray, jchar*, Char)
+ARRAY_TRAITS(jdoubleArray, jdouble*, Double)
+ARRAY_TRAITS(jfloatArray, jfloat*, Float)
+ARRAY_TRAITS(jintArray, jint*, Int)
+ARRAY_TRAITS(jlongArray, jlong*, Long)
+ARRAY_TRAITS(jshortArray, jshort*, Short)
+
+#undef ARRAY_TRAITS
+
+template<typename JavaArrayType, typename PrimitiveType, class Traits, size_t preallocSize = 10>
+class ScopedArrayRO {
+public:
+ ScopedArrayRO(JNIEnv* env, JavaArrayType javaArray) : mEnv(env), mJavaArray(javaArray) {
+ if (mJavaArray == nullptr) {
+ mSize = 0;
+ mRawArray = nullptr;
+ } else {
+ mSize = mEnv->GetArrayLength(mJavaArray);
+ if (mSize <= preallocSize) {
+ Traits::getArrayRegion(mEnv, mJavaArray, 0, mSize, mBuffer);
+ mRawArray = mBuffer;
+ } else {
+ mRawArray = Traits::getArrayElements(mEnv, mJavaArray);
+ }
+ }
+ }
+
+ ~ScopedArrayRO() {
+ if (mRawArray != nullptr && mRawArray != mBuffer) {
+ Traits::releaseArrayElements(mEnv, mJavaArray, mRawArray, JNI_ABORT);
+ }
+ }
+
+ const PrimitiveType* get() const { return mRawArray; }
+ const PrimitiveType& operator[](size_t n) const { return mRawArray[n]; }
+ size_t size() const { return mSize; }
+
+private:
+ JNIEnv* const mEnv;
+ JavaArrayType mJavaArray;
+ PrimitiveType* mRawArray;
+ size_t mSize;
+ PrimitiveType mBuffer[preallocSize];
+ DISALLOW_COPY_AND_ASSIGN(ScopedArrayRO);
+};
+
+// ScopedNullable***ArrayRO provide convenient read-only access to Java array from JNI code.
+// These accept nullptr. In that case, get() returns nullptr and size() returns 0.
+using ScopedNullableBooleanArrayRO = ScopedArrayRO<jbooleanArray, jboolean, BooleanArrayTraits>;
+using ScopedNullableByteArrayRO = ScopedArrayRO<jbyteArray, jbyte, ByteArrayTraits>;
+using ScopedNullableCharArrayRO = ScopedArrayRO<jcharArray, jchar, CharArrayTraits>;
+using ScopedNullableDoubleArrayRO = ScopedArrayRO<jdoubleArray, jdouble, DoubleArrayTraits>;
+using ScopedNullableFloatArrayRO = ScopedArrayRO<jfloatArray, jfloat, FloatArrayTraits>;
+using ScopedNullableIntArrayRO = ScopedArrayRO<jintArray, jint, IntArrayTraits>;
+using ScopedNullableLongArrayRO = ScopedArrayRO<jlongArray, jlong, LongArrayTraits>;
+using ScopedNullableShortArrayRO = ScopedArrayRO<jshortArray, jshort, ShortArrayTraits>;
+
+} // namespace android
+
+#endif // SCOPED_NULLABLE_PRIMITIVE_ARRAY_H