src/library_desugar/java/java/adapter/HybridFileTypeDetector.java

// Copyright (c) 2022, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package java.adapter;

import desugar.sun.nio.fs.DesugarDefaultFileTypeDetector;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.spi.FileTypeDetector;

/**
 * A hybrid file type detector adapter that delegates different implementations based on the runtime
 * environment.
 */
public final class HybridFileTypeDetector {
  private HybridFileTypeDetector() {}

  public static FileTypeDetector create() {
    try {
      // On API 26 and above, java.nio.file.Files is present.
      Class.forName("java.nio.file.Files");
      return new PlatformFileTypeDetector();
    } catch (ClassNotFoundException ignored) {
      return DesugarDefaultFileTypeDetector.create();
    }
  }

  static class PlatformFileTypeDetector extends FileTypeDetector {
    @Override
    public String probeContentType(Path path) throws IOException {
      return j$.nio.file.Files.probeContentType(j$.nio.file.Path.wrap_convert(path));
    }
  }
}