/*
 *                    BioJava development code
 *
 * This code may be freely distributed and modified under the
 * terms of the GNU Lesser General Public Licence.  This should
 * be distributed with the code.  If you do not have a copy,
 * see:
 *
 *      http://www.gnu.org/copyleft/lesser.html
 *
 * Copyright for this code is held jointly by the individual
 * authors.  These should be listed in @author doc comments.
 *
 * For more information on the BioJava project and its aims,
 * or to join the biojava-l mailing list, visit the home page
 * at:
 *
 *      http://www.biojava.org/
 *
 */
package org.biojava.bio.program.tagvalue;

/**
 * <p>
 * A simple listener that just echoes events back to the console.
 * </p>
 *
 * @author Matthew Pocock
 * @since 1.3
 */
public class Echo implements TagValueListener {
  private int depth = 0;
  private String indent = "";
  
  public void startRecord() {
    System.out.println(depth + indent + "[");
    indent();
  }
  
  public void endRecord() {
    outdent();
    System.out.println(depth + indent + "]");
  }
  
  public void startTag(Object tag) {
    System.out.println(depth + indent + tag + " {");
    indent();
  }
  
  public void endTag() {
    outdent();
    System.out.println(depth + indent + "}");
  }
  
  private void indent() {
    depth += 1;
    indent += "  ";
  }
  
  private void outdent() {
    indent = ""; 
    depth--;
    for(int i = 0; i < depth; i++) {
      indent += "  ";
    }
  }
  
  public void value(TagValueContext tvc, Object value) {
    System.out.println(depth + indent + value);
  }
}