code: package org.omnetpp.eventlog.entry;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.ArrayList;
  
  import org.omnetpp.eventlog.IChunk;
  import org.omnetpp.eventlog.EventLogTokenBasedEntry;
  public class CustomReferenceEntry extends EventLogTokenBasedEntry
  {
      public String type;
      public long key;
  
      public CustomReferenceEntry() {
          this.chunk = null;
          type = null;
          key = -1;
      }
  
      public CustomReferenceEntry(IChunk chunk, int entryIndex) {
          this.chunk = chunk;
          this.entryIndex = entryIndex;
          type = null;
          key = -1;
      }
  
      public String getType() { return type; }
      public long getKey() { return key; }
  
      public void parse(String[] tokens, int numTokens) {
          type = getStringToken(tokens, numTokens, "t", true, type);
          key = getLongToken(tokens, numTokens, "k", true, key);
      }
  
      public void print(OutputStream stream) {
          try {
              stream.write((" t " + qoute(type)).getBytes());
              stream.write((" k " + String.valueOf(key)).getBytes());
              stream.flush();
          }
          catch (IOException e) {
              throw new RuntimeException (e);
          }
      }
  
      public int getClassIndex() { return 60; }
  
      public String getAsString() { return "abstract"; }
  
      public ArrayList<String> getAttributeNames() {
          ArrayList<String> names = new ArrayList<String>();
          names.add("t");
          names.add("k");
          return names;
      }
  
      @SuppressWarnings("unused")
      public String getAsString(String attribute) {
          if (false)
              return null;
          else if (attribute.equals("t"))
              return type;
          else if (attribute.equals("k"))
              return String.valueOf(key);
          else
              return null;
  
      }
  
      public String getClassName() { return "CustomReferenceEntry"; }
  }
  
  