import org.codelibs.core.exception.IORuntimeException;

/**
 * Utility class for {@link Reader} operations.
 *
 * @author higa
 */
public abstract class ReaderUtil {

    /**
     * Do not instantiate.
     */
    protected ReaderUtil() {
    }

    /** Default buffer size */
    private static final int BUF_SIZE = 4096;

    /**

        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
    //
    /**

        assertArgumentNotNull("reader", reader);
        this.reader = reader;
    }

    @Override
    public boolean hasNext() {
        if (line == EMPTY) {
            line = ReaderUtil.readLine(reader);
        }
        return line != null;
    }

    @Override
    public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }

            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;

        assertArgumentNotNull("props", props);
        assertArgumentNotNull("file", file);
        assertArgumentNotEmpty("encoding", encoding);

        final Reader reader = ReaderUtil.create(file, encoding);

        try {
            props.load(reader);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        } finally {