1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <android_runtime/AndroidRuntime.h>
18#include <log/log.h>
19
20#include <string>
21
22// Use reflection to query the default cache dir.
23// The function is NOT thread-safe. It is expected to be called
24// at most once per process.
25extern "C" const char* rsQueryCacheDir() {
26    static std::string cacheDir;
27    // First check if we have JavaVM running in this process.
28    if (android::AndroidRuntime::getJavaVM()) {
29        JNIEnv* env = android::AndroidRuntime::getJNIEnv();
30        if (env) {
31            jclass cacheDirClass = env->FindClass("android/renderscript/RenderScriptCacheDir");
32            jfieldID cacheDirID = env->GetStaticFieldID(cacheDirClass, "mCacheDir", "Ljava/io/File;");
33            jobject cache_dir = env->GetStaticObjectField(cacheDirClass, cacheDirID);
34
35            if (cache_dir) {
36                jclass fileClass = env->FindClass("java/io/File");
37                jmethodID getPath = env->GetMethodID(fileClass, "getPath", "()Ljava/lang/String;");
38                jstring path_string = (jstring)env->CallObjectMethod(cache_dir, getPath);
39                const char *path_chars = env->GetStringUTFChars(path_string, NULL);
40
41                ALOGD("Successfully queried cache dir: %s", path_chars);
42                cacheDir = std::string(path_chars);
43                env->ReleaseStringUTFChars(path_string, path_chars);
44            } else {
45                ALOGD("Cache dir not initialized");
46            }
47        } else {
48            ALOGD("Failed to query the default cache dir.");
49        }
50    }
51
52    return cacheDir.c_str();
53}
54
55