code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you 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 org.openqa.selenium;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.Base64;
  
  /**
   * Defines the output type for a screenshot.
   *
   * @see TakesScreenshot
   * @param <T> Type for the screenshot output.
   */
  public interface OutputType<T> {
    /** Obtain the screenshot as base64 data. */
    OutputType<String> BASE64 =
        new OutputType<String>() {
          @Override
          public String convertFromBase64Png(String base64Png) {
            return base64Png;
          }
  
          @Override
          public String convertFromPngBytes(byte[] png) {
            return Base64.getEncoder().encodeToString(png);
          }
  
          public String toString() {
            return "OutputType.BASE64";
          }
        };
  
    /** Obtain the screenshot as raw bytes. */
    OutputType<byte[]> BYTES =
        new OutputType<byte[]>() {
          @Override
          public byte[] convertFromBase64Png(String base64Png) {
            return Base64.getDecoder().decode(base64Png);
          }
  
          @Override
          public byte[] convertFromPngBytes(byte[] png) {
            return png;
          }
  
          public String toString() {
            return "OutputType.BYTES";
          }
        };
  
    /**
     * Obtain the screenshot into a temporary file that will be deleted once the JVM exits. It is up
     * to users to make a copy of this file.
     */
    OutputType<File> FILE =
        new OutputType<File>() {
          @Override
          public File convertFromBase64Png(String base64Png) {
            return save(BYTES.convertFromBase64Png(base64Png));
          }
  
          @Override
          public File convertFromPngBytes(byte[] data) {
            return save(data);
          }
  
          private File save(byte[] data) {
            try {
              Path tmpFilePath = Files.createTempFile("screenshot", ".png");
              File tmpFile = tmpFilePath.toFile();
              tmpFile.deleteOnExit();
              Files.write(tmpFilePath, data);
              return tmpFile;
            } catch (IOException e) {
              throw new WebDriverException(e);
            }
          }
  
          public String toString() {
            return "OutputType.FILE";
          }
        };
  
    /**
     * Convert the given base64 png to a requested format.
     *
     * @param base64Png base64 encoded png.
     * @return png encoded into requested format.
     */
    T convertFromBase64Png(String base64Png);
  
    /**
     * Convert the given png to a requested format.
     *
     * @param png an array of bytes forming a png file.
     * @return png encoded into requested format.
     */
    T convertFromPngBytes(byte[] png);
  }
  