upload android base code part6

android/libnativehelper/include/nativehelper/toStringArray.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2011 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 TO_STRING_ARRAY_H_included
+#define TO_STRING_ARRAY_H_included
+
+#include "jni.h"
+#include "ScopedLocalRef.h"
+
+#include <string>
+#include <vector>
+
+jobjectArray newStringArray(JNIEnv* env, size_t count);
+
+template <typename Counter, typename Getter>
+jobjectArray toStringArray(JNIEnv* env, Counter* counter, Getter* getter) {
+    size_t count = (*counter)();
+    jobjectArray result = newStringArray(env, count);
+    if (result == NULL) {
+        return NULL;
+    }
+    for (size_t i = 0; i < count; ++i) {
+        ScopedLocalRef<jstring> s(env, env->NewStringUTF((*getter)(i)));
+        if (env->ExceptionCheck()) {
+            return NULL;
+        }
+        env->SetObjectArrayElement(result, i, s.get());
+        if (env->ExceptionCheck()) {
+            return NULL;
+        }
+    }
+    return result;
+}
+
+struct VectorCounter {
+    const std::vector<std::string>& strings;
+    explicit VectorCounter(const std::vector<std::string>& strings) : strings(strings) {}
+    size_t operator()() {
+        return strings.size();
+    }
+};
+struct VectorGetter {
+    const std::vector<std::string>& strings;
+    explicit VectorGetter(const std::vector<std::string>& strings) : strings(strings) {}
+    const char* operator()(size_t i) {
+        return strings[i].c_str();
+    }
+};
+
+inline jobjectArray toStringArray(JNIEnv* env, const std::vector<std::string>& strings) {
+    VectorCounter counter(strings);
+    VectorGetter getter(strings);
+    return toStringArray<VectorCounter, VectorGetter>(env, &counter, &getter);
+}
+
+JNIEXPORT jobjectArray toStringArray(JNIEnv* env, const char* const* strings);
+
+#endif  // TO_STRING_ARRAY_H_included