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Vaadin Upload

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package com.vaadin.flow.component.upload.receivers;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class TemporaryFileFactory implements FileFactory {

    /**
     * Create a new temporary file
     */
    @Override
    public File createFile(String fileName) throws IOException {

        final String tempFileName = "upload_temp_file";
        Path tempDirectory = TempDirectory.getPath();

        if (tempDirectory == null) {
            throw new IOException("Failed to create temp directory");
        }
        return Files.createTempFile(tempDirectory, tempFileName, "tmp")
                .toFile();
    }
}