public override bool Equals(Object o)
{
if (this == o)
{
return(true);
}
if ((o == null) || (this.GetType() != o.GetType()))
{
return(false);
}
BinarySentence bs = (BinarySentence)o;
return((bs.getOperator().Equals(getOperator())) &&
(bs.getFirst().Equals(first)) && (bs.getSecond()
.Equals(second)));
}
public static Sentence chainWith(string connector, ArrayList sentences)
{
if (sentences.Count == 0)
{
return null;
}
else if (sentences.Count == 1)
{
return (Sentence) sentences[0];
}
else
{
Sentence soFar = (Sentence) sentences[0];
for (int i = 1; i < sentences.Count; i++)
{
Sentence next = (Sentence) sentences[i];
soFar = new BinarySentence(connector, soFar, next);
}
return soFar;
}
}
public virtual Object visitBinarySentence(BinarySentence bs, Object arg)
{
Hashtable s =(Hashtable)arg;
Hashtable termunion = new SetOps().union((Hashtable)bs.getFirst().accept(this,arg),(Hashtable)bs.getSecond().accept(this,arg));
return new SetOps().union(s,termunion);
}
public Object visitBinarySentence(BinarySentence bs, Object arg)
{
Object firstValue = bs.getFirst().accept(this,null);
Object secondValue = bs.getSecond().accept(this,null);
if ((firstValue == null) || (secondValue == null))
{ //strictly not
// true for or/and
// -FIX later
return null;
}
else
{
string oper = bs.getOperator();
if (oper.Equals("AND"))
{
return evaluateAnd((bool) firstValue, (bool) secondValue);
}
if (oper.Equals("OR"))
{
return evaluateOr((bool) firstValue, (bool) secondValue);
}
if (oper.Equals("=>"))
{
return evaluateImplied((bool) firstValue,
(bool) secondValue);
}
if (oper.Equals("<=>"))
{
return evaluateBiConditional((bool) firstValue,
(bool) secondValue);
}
return null;
}
}