src/main/java/org/apache/commons/io/output/ProxyOutputStream.java [79:124]:
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    @SuppressWarnings("unused") // Possibly thrown from subclasses.
    protected void beforeWrite(final int n) throws IOException {
        // noop
    }

    /**
     * Invokes the delegate's {@code close()} method.
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
        IOUtils.close(out, this::handleIOException);
    }

    /**
     * Invokes the delegate's {@code flush()} method.
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void flush() throws IOException {
        try {
            out.flush();
        } catch (final IOException e) {
            handleIOException(e);
        }
    }

    /**
     * Handle any IOExceptions thrown.
     * <p>
     * This method provides a point to implement custom exception
     * handling. The default behavior is to re-throw the exception.
     * @param e The IOException thrown
     * @throws IOException if an I/O error occurs.
     * @since 2.0
     */
    protected void handleIOException(final IOException e) throws IOException {
        throw e;
    }

    /**
     * Invokes the delegate's {@code write(byte[])} method.
     * @param bts the bytes to write
     * @throws IOException if an I/O error occurs.
     */
    @Override
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src/main/java/org/apache/commons/io/output/ProxyWriter.java [137:184]:
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    @SuppressWarnings("unused") // Possibly thrown from subclasses.
    protected void beforeWrite(final int n) throws IOException {
        // noop
    }

    /**
     * Invokes the delegate's {@code close()} method.
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
        IOUtils.close(out, this::handleIOException);
    }

    /**
     * Invokes the delegate's {@code flush()} method.
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void flush() throws IOException {
        try {
            out.flush();
        } catch (final IOException e) {
            handleIOException(e);
        }
    }

    /**
     * Handles any IOExceptions thrown.
     * <p>
     * This method provides a point to implement custom exception
     * handling. The default behavior is to re-throw the exception.
     * </p>
     *
     * @param e The IOException thrown
     * @throws IOException if an I/O error occurs.
     * @since 2.0
     */
    protected void handleIOException(final IOException e) throws IOException {
        throw e;
    }

    /**
     * Invokes the delegate's {@code write(char[])} method.
     * @param cbuf the characters to write
     * @throws IOException if an I/O error occurs.
     */
    @Override
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