HidlTransportUtils.h revision 2ac326f3a86f4c6c1c087ea4a565df5b918e4d2b 
1/*
2 * Copyright (C) 2016 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#ifndef ANDROID_HIDL_TRANSPORT_UTILS_H
18#define ANDROID_HIDL_TRANSPORT_UTILS_H
19
20#include <android/hidl/base/1.0/IBase.h>
21
22namespace android {
23namespace hardware {
24namespace details {
25
26/*
27 * Verifies the interface chain of 'interface' contains 'castTo'
28 */
29inline bool canCastInterface(::android::hidl::base::V1_0::IBase* interface, const char* castTo) {
30    if (interface == nullptr) {
31        return false;
32    }
33
34    bool canCast = false;
35    auto ret = interface->interfaceChain([&](const hidl_vec<hidl_string> &types) {
36        for (size_t i = 0; i < types.size(); i++) {
37            if (types[i] == castTo) {
38                canCast = true;
39                break;
40            }
41        }
42    });
43    return ret.isOk() && canCast;
44}
45
46inline std::string getDescriptor(::android::hidl::base::V1_0::IBase* interface) {
47    std::string myDescriptor{};
48    auto ret = interface->interfaceDescriptor([&](const hidl_string &types) {
49        myDescriptor = types.c_str();
50    });
51    ret.isOk(); // ignored, return empty string if not isOk()
52    return myDescriptor;
53}
54
55}   // namespace details
56}   // namespace hardware
57}   // namespace android
58
59#endif //ANDROID_HIDL_TRANSPORT_UTILS_H
60