assertArgumentNotNull("in", in);
        assertArgumentNotEmpty("encoding", encoding);
        assertArgumentNotNull("out", out);

        final Reader is = ReaderUtil.create(wrap(in), encoding);
        return copyInternal(is, wrap(out));
    }

    // ////////////////////////////////////////////////////////////////
    // from InputStream to File
    //
    /**

            return readText(URLUtil.toFile(url), encoding);
        }
        final InputStream is = URLUtil.openStream(url);
        try {
            final Reader reader = ReaderUtil.create(new BufferedInputStream(is, DEFAULT_BUF_SIZE), encoding);
            return read(reader, DEFAULT_BUF_SIZE);
        } finally {
            CloseableUtil.close(is);
        }
    }

    /**

import java.util.zip.GZIPOutputStream;

import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.io.ReaderUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.crawler.builder.RequestDataBuilder;
import org.codelibs.fess.crawler.client.CrawlerClient;