001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020package org.crsh.text;
021
022/**
023 * The line reader.
024 */
025public interface LineReader {
026
027  /**
028   * Returns true if the renderer has a next line to render.
029   *
030   * @return when there is at least a next line to read
031   */
032  boolean hasLine();
033
034  /**
035   * Renders the element.
036   *
037   * @param to the buffer for rendering
038   * @throws IllegalStateException when there is no line to render
039   */
040  void renderLine(RenderAppendable to) throws IllegalStateException;
041
042}