File.java

package com.github.javafaker;

import java.util.Locale;

public class File {
    private final Faker faker;

    protected File(Faker faker) {
        this.faker = faker;
    }

    public String extension() {
        return faker.resolve("file.extension");
    }
    
    public String mimeType() {
        return faker.resolve("file.mime_type");
    }

    public String fileName() {
        return fileName(null, null, null, null);
    }

    public String fileName(String dirOrNull, String nameOrNull, String extensionOrNull, String separatorOrNull) {
        final String sep = separatorOrNull == null ? System.getProperty("file.separator") : separatorOrNull;
        final String dir = dirOrNull == null ? faker.internet().slug() : dirOrNull;
        final String name = nameOrNull == null ? faker.lorem().word().toLowerCase(Locale.ROOT) : nameOrNull;
        final String ext = extensionOrNull == null ? extension() : extensionOrNull;
        return dir + sep + name + "." + ext;
    }
}