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    
020    package org.crsh.text;
021    
022    public interface LineReader {
023    
024      /**
025       * Returns true if the renderer has a next line to render.
026       *
027       * @return when there is at least a next line to read
028       */
029      boolean hasLine();
030    
031      /**
032       * Renders the element.
033       *
034       * @param to the buffer for rendering
035       * @throws IllegalStateException when there is no line to render
036       */
037      void renderLine(RenderAppendable to) throws IllegalStateException;
038    
039    }