001/*
002 *                    BioJava development code
003 *
004 * This code may be freely distributed and modified under the
005 * terms of the GNU Lesser General Public Licence.  This should
006 * be distributed with the code.  If you do not have a copy,
007 * see:
008 *
009 *      http://www.gnu.org/copyleft/lesser.html
010 *
011 * Copyright for this code is held jointly by the individual
012 * authors.  These should be listed in @author doc comments.
013 *
014 * For more information on the BioJava project and its aims,
015 * or to join the biojava-l mailing list, visit the home page
016 * at:
017 *
018 *      http://www.biojava.org/
019 *
020 */
021package org.biojava.bio.program.tagvalue;
022
023/**
024 * <p>
025 * A simple listener that just echoes events back to the console.
026 * </p>
027 *
028 * @author Matthew Pocock
029 * @since 1.3
030 */
031public class Echo implements TagValueListener {
032  private int depth = 0;
033  private String indent = "";
034  
035  public void startRecord() {
036    System.out.println(depth + indent + "[");
037    indent();
038  }
039  
040  public void endRecord() {
041    outdent();
042    System.out.println(depth + indent + "]");
043  }
044  
045  public void startTag(Object tag) {
046    System.out.println(depth + indent + tag + " {");
047    indent();
048  }
049  
050  public void endTag() {
051    outdent();
052    System.out.println(depth + indent + "}");
053  }
054  
055  private void indent() {
056    depth += 1;
057    indent += "  ";
058  }
059  
060  private void outdent() {
061    indent = ""; 
062    depth--;
063    for(int i = 0; i < depth; i++) {
064      indent += "  ";
065    }
066  }
067  
068  public void value(TagValueContext tvc, Object value) {
069    System.out.println(depth + indent + value);
070  }
071}
072