public Hashtable getSymbolsIn(Sentence s)
{
if (s == null)
{//empty knowledge bases == null fix this later
return new Hashtable();
}
object o = s.accept(this,new Hashtable());
Hashtable h = (Hashtable)o;
return (Hashtable)s.accept(this, new Hashtable());
}
// public void print()
// {
// Iterator i = h.keySet().iterator();
// while (i.hasNext())
// {
// Object key = i.next();
// Object value = h.get(key);
// System.out.print(key + " = " + value + " ");
// //System.out.print (key +" = " +((Boolean)value).booleanValue());
// }
// System.out.println();
// }
public bool isTrue(Sentence clause)
{
Object result = clause.accept(this,null);
return (result == null) ? false : ((bool) result)==true;
}
public bool isFalse(Sentence clause)
{
Object o = clause.accept(this,null);
return (o != null) ? ((bool) o)==false : false;
}
public bool isUnknown(Sentence clause)
{ //TODO TEST WELL
Object o = clause.accept(this,null);
return (o == null) ;
}
