001    /*
002     * Copyright (C) 2010 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.shell.ui;
021    
022    import org.crsh.shell.io.ShellWriterContext;
023    
024    import java.io.IOException;
025    import java.util.ArrayList;
026    import java.util.EnumMap;
027    
028    /**
029     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
030     * @version $Revision$
031     */
032    class UIWriterContext implements ShellWriterContext {
033    
034      /** . */
035      final ArrayList<Pad> stack;
036    
037      /** . */
038      boolean needLF;
039    
040      UIWriterContext() {
041        this.stack = new ArrayList<Pad>();
042        this.needLF = false;
043      }
044    
045      private static EnumMap<Pad, String> charMap = new EnumMap<Pad, String>(Pad.class);
046      private static EnumMap<Pad, Pad> nextMap = new EnumMap<Pad, Pad>(Pad.class);
047    
048      static {
049        charMap.put(Pad.BRANCH, "+-");
050        charMap.put(Pad.LAST_BRANCH, "+-");
051        charMap.put(Pad.CONTINUE_BRANCH, "| ");
052        charMap.put(Pad.STOP_BRANCH, "  ");
053        nextMap.put(Pad.BRANCH, Pad.CONTINUE_BRANCH);
054        nextMap.put(Pad.CONTINUE_BRANCH, Pad.CONTINUE_BRANCH);
055        nextMap.put(Pad.LAST_BRANCH, Pad.STOP_BRANCH);
056        nextMap.put(Pad.STOP_BRANCH, Pad.STOP_BRANCH);
057      }
058    
059      public void pad(Appendable appendable) throws IOException {
060        for (int i = 0;i < stack.size();i++) {
061          Pad abc = stack.get(i);
062          appendable.append(charMap.get(abc));
063          Pad next = nextMap.get(abc);
064          stack.set(i, next);
065        }
066      }
067    
068      public void text(CharSequence csq, int off, int end) {
069        needLF = true;
070      }
071    
072      public void lineFeed() {
073        needLF = false;
074      }
075    }