blob: 8c612817d126bf8ba9a1669d09de489b1d353e46 [file] [log] [blame]
/*
* Copyright (C) 2016 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.
*/
#include <hidl/HidlTransportUtils.h>
#include <android/hidl/base/1.0/IBase.h>
namespace android {
namespace hardware {
namespace details {
using ::android::hidl::base::V1_0::IBase;
Return<bool> canCastInterface(IBase* interface, const char* castTo, bool emitError) {
if (interface == nullptr) {
return false;
}
// b/68217907
// Every HIDL interface is a base interface.
if (std::string(IBase::descriptor) == castTo) {
return true;
}
bool canCast = false;
auto chainRet = interface->interfaceChain([&](const hidl_vec<hidl_string> &types) {
for (size_t i = 0; i < types.size(); i++) {
if (types[i] == castTo) {
canCast = true;
break;
}
}
});
if (!chainRet.isOk()) {
// call fails, propagate the error if emitError
return emitError
? details::StatusOf<void, bool>(chainRet)
: Return<bool>(false);
}
return canCast;
}
std::string getDescriptor(IBase* interface) {
if (interface == nullptr) {
return "";
}
std::string myDescriptor{};
auto ret = interface->interfaceDescriptor([&](const hidl_string &types) {
myDescriptor = types.c_str();
});
ret.isOk(); // ignored, return empty string if not isOk()
return myDescriptor;
}
} // namespace details
} // namespace hardware
} // namespace android