/// <summary>
///Check if All Variables are Defined
/// </summary>
/// <param name="source">source</param>
/// <param name="logic">logic info</param>
/// <returns>true if fully defined</returns>
public static bool IsAllVariablesDefined(Evaluatee source, string logic)
{
if (logic == null || logic.Length == 0)
{
return(true);
}
//
int pos = 0;
while (pos < logic.Length)
{
int first = logic.IndexOf('@', pos);
if (first == -1)
{
return(true);
}
//int second = logic.Substring(first + 1);
int second = logic.IndexOf('@', first + 1);
if (second == -1)
{
//log.severe("No second @ in Logic: " + logic);
return(false);
}
//string variable = logic.substring(first + 1, second - 1);
string variable = logic.Substring(first + 1, second - 1);
String eval = source.GetValueAsString(variable);
//log.finest(variable + "=" + eval);
if (eval == null || eval.Length == 0)
{
return(false);
}
//
pos = second + 1;
}
return(true);
}
/// <summary>
///Evaluate @context@=value or @context@!value or @context@^value.
///<pre>
///value: strips ' and " always (no escape or mid stream)
///value: can also be a context variable
///</pre>
///@param source
/// </summary>
/// <param name="source">class implementing get_ValueAsString(variable)</param>
/// <param name="logic">logic tuple</param>
/// <returns>true or false</returns>
private static bool EvaluateLogicTuple(Evaluatee source, string logic)
{
StringTokenizer st = new StringTokenizer(logic.Trim(), "!=^><", true);
if (st.CountTokens() != 3)
{
//log.warning("Logic tuple does not comply with format "
// + "'@context@=value' where operand could be one of '=!^><' => " + logic);
return(false);
}
// First Part
String first = st.NextToken().Trim(); // get '@tag@'
String firstEval = first.Trim();
if (first.IndexOf('@') != -1) // variable
{
first = first.Replace('@', ' ').Trim(); // strip 'tag'
//firstEval = source.get_ValueAsString(first); // replace with it's value
firstEval = source.GetValueAsString(first);
if (firstEval == null)
{
firstEval = "";
}
}
firstEval = firstEval.Replace('\'', ' ').Replace('"', ' ').Trim(); // strip ' and "
// Comperator
String operand = st.NextToken();
// Second Part
String second = st.NextToken(); // get value
String secondEval = second.Trim();
if (second.IndexOf('@') != -1) // variable
{
second = second.Replace('@', ' ').Trim(); // strip tag
//secondEval = source.get_ValueAsString(second); // replace with it's value
secondEval = source.GetValueAsString(second); // replace with it's value
if (secondEval == null)
{
secondEval = "";
}
}
secondEval = secondEval.Replace('\'', ' ').Replace('"', ' ').Trim(); // strip ' and "
// Handling of ID compare (null => 0)
if (first.IndexOf("_ID") != -1 && firstEval.Length == 0)
{
firstEval = "0";
}
if (second.IndexOf("_ID") != -1 && secondEval.Length == 0)
{
secondEval = "0";
}
// Logical Comparison
bool result = EvaluateLogicTuple(firstEval, operand, secondEval);
//if (log.isLevelFinest())
// log.finest(logic
// + " => \"" + firstEval + "\" " + operand + " \"" + secondEval + "\" => " + result);
//
return(result);
}