Symboltable.java from DrJava at Krugle

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package edu.rice.cs.javalanglevels;
import java.util.*;

/**
 * This class extends Hashtable so that we can have extra functionality in the put function.
 * A Symboltable is specifically a Hashtable of Strings to SymbolData.  The put function
 * checks to see if the specified SymbolData is already in the table.  If so, it simply updates its
 * fields.
 */

public class Symboltable extends Hashtable<String, SymbolData> {
  
  /**
   * Overrides put function of hash table.  If the specified SymbolData is already in
   * the table, simply update its fields.  Otherwise, do a normal put operation.
   * */
  public SymbolData put (String name, SymbolData sd) {
    SymbolData inTable = (SymbolData) this.get(sd.getName());
    if (inTable != null) {
      /**Replace all its fields with those of sd.*/
      inTable.setIsContinuation(sd.isContinuation());
      inTable.setTypeParameters(sd.getTypeParameters());
      inTable.setMethods(sd.getMethods());
      inTable.setSuperClass(sd.getSuperClass());
      inTable.setInterfaces(sd.getInterfaces());
      inTable.setOuterData(sd.getOuterData());
      inTable.setInnerClasses(sd.getInnerClasses());
    }
    else {
      super.put(sd.getName(), sd);
    }
    
    return sd;
  }
  
  public SymbolData get (String name) {
    return super.get(name);
  }
}
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