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96 lines
3.2 KiB
96 lines
3.2 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_VINTF_FILE_SYSTEM_H
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#define ANDROID_VINTF_FILE_SYSTEM_H
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#include <memory>
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#include <mutex>
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#include <string>
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#include <vector>
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#include <utils/Errors.h>
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namespace android {
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namespace vintf {
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// Queries the file system in the correct way. Files can come from
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// an actual file system, a sub-directory, or from ADB, depending on the
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// implementation.
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//
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// This class can be used to create a mock for overriding.
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class FileSystem {
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public:
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virtual ~FileSystem() {}
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// Return NAME_NOT_FOUND if file is not found,
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// OK if file is retrieved and written to "fetched".
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virtual status_t fetch(const std::string& path, std::string* fetched,
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std::string* error) const = 0;
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// Return NAME_NOT_FOUND if directory is not found,
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// OK if file names are retrieved and written to out.
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virtual status_t listFiles(const std::string& path, std::vector<std::string>* out,
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std::string* error) const = 0;
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};
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// Interface to a writable filesystem.
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class WritableFileSystem : public FileSystem {
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public:
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// Return OK if successful. On error, return -errno, or UNKNOWN_ERROR if unknown.
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virtual status_t write(const std::string& path, const std::string& content,
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std::string* error) const = 0;
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// Return OK if successful. On error, return -errno, or UNKNOWN_ERROR if unknown.
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virtual status_t deleteFile(const std::string& path, std::string* error) const = 0;
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};
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namespace details {
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// Class that actually queries the file system.
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class FileSystemImpl : public FileSystem {
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public:
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status_t fetch(const std::string&, std::string*, std::string*) const;
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status_t listFiles(const std::string&, std::vector<std::string>*, std::string*) const;
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};
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// Class that does nothing.
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class FileSystemNoOp : public FileSystem {
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public:
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status_t fetch(const std::string&, std::string*, std::string*) const;
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status_t listFiles(const std::string&, std::vector<std::string>*, std::string*) const;
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};
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// The root is mounted to a given path.
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class FileSystemUnderPath : public FileSystem {
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public:
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FileSystemUnderPath(const std::string& rootdir);
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virtual status_t fetch(const std::string& path, std::string* fetched,
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std::string* error) const override;
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virtual status_t listFiles(const std::string& path, std::vector<std::string>* out,
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std::string* error) const override;
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protected:
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const std::string& getRootDir() const;
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private:
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std::string mRootDir;
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FileSystemImpl mImpl;
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};
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} // namespace details
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} // namespace vintf
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} // namespace android
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#endif
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