tools/aapt2/io/FileSystem.h

/*
 * Copyright (C) 2015 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 AAPT_IO_FILESYSTEM_H
#define AAPT_IO_FILESYSTEM_H

#include "io/File.h"
#include "util/Files.h"

namespace aapt {
namespace io {

/**
 * A regular file from the file system. Uses mmap to open the data.
 */
class RegularFile : public IFile {
public:
    RegularFile(const Source& source) : mSource(source) {
    }

    std::unique_ptr<IData> openAsData() override {
        android::FileMap map;
        if (Maybe<android::FileMap> map = file::mmapPath(mSource.path, nullptr)) {
            return util::make_unique<MmappedData>(std::move(map.value()));
        }
        return {};
    }

    const Source& getSource() const override {
        return mSource;
    }

private:
    Source mSource;
};

/**
 * An IFileCollection representing the file system.
 */
class FileCollection : public IFileCollection {
public:
    /**
     * Adds a file located at path. Returns the IFile representation of that file.
     */
    IFile* insertFile(const StringPiece& path) {
        mFiles.push_back(util::make_unique<RegularFile>(Source(path)));
        return mFiles.back().get();
    }

    const_iterator begin() const override {
        return mFiles.begin();
    }

    const_iterator end() const override {
        return mFiles.end();
    }

private:
    std::vector<std::unique_ptr<IFile>> mFiles;
};

} // namespace io
} // namespace aapt

#endif // AAPT_IO_FILESYSTEM_H