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Trino - Legacy HDFS file system support

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/*
 * 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.
 */
package io.trino.hdfs;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FilterFileSystem;

public final class FileSystemUtils
{
    private FileSystemUtils() {}

    public static FileSystem getRawFileSystem(FileSystem fileSystem)
    {
        while (fileSystem instanceof FilterFileSystem wrapper) {
            fileSystem = wrapper.getRawFileSystem();
        }
        return fileSystem;
    }
}