public override bool Evaluate(Resource[] args, ref Resource @object)
{
Decimal sum = InitialValue;
foreach (Resource r in args)
{
if (r == null)
{
return(false);
}
if (!(r is Literal))
{
return(false);
}
try {
Decimal v = (Decimal)Convert.ChangeType(((Literal)r).ParseValue(), typeof(Decimal));
sum = Combine(sum, v);
} catch (FormatException) {
return(false);
}
}
Resource newvalue = Literal.FromValue(sum);
if (@object == null)
{
@object = newvalue;
return(true);
}
else
{
return(@object.Equals(newvalue));
}
}
public override bool Evaluate(Resource[] args, ref Resource @object)
{
if (args.Length != 2)
{
return(false);
}
if (args[0] == null || !(args[0] is Literal))
{
return(false);
}
if (args[1] == null || !(args[1] is Literal))
{
return(false);
}
try {
Decimal left = (Decimal)Convert.ChangeType(((Literal)args[0]).ParseValue(), typeof(Decimal));
Decimal right = (Decimal)Convert.ChangeType(((Literal)args[1]).ParseValue(), typeof(Decimal));
Resource newvalue = Literal.FromValue(Evaluate(left, right));
if (@object == null)
{
@object = newvalue;
return(true);
}
else
{
return(@object.Equals(newvalue));
}
} catch (FormatException) {
return(false);
}
}
public override Resource Evaluate(Resource[] args)
{
if (args.Length != 2)
{
throw new InvalidOperationException("This relation takes two arguments.");
}
Resource left = args[0];
Resource right = args[1];
bool result = Evaluate(new Resource[] { left }, ref right);
return(Literal.FromValue(result));
}
public override bool Evaluate(Resource[] args, ref Resource @object)
{
if (args.Length != 1)
{
return(false);
}
if (args[0] == null && @object == null)
{
return(false);
}
if ((args[0] != null && !(args[0] is Literal)) || (@object != null && !(@object is Literal)))
{
return(false);
}
try {
if (args[0] == null)
{
Decimal right = (Decimal)Convert.ChangeType(((Literal)@object).ParseValue(), typeof(Decimal));
Decimal left = EvaluateReverse(right);
if (left == Decimal.MinValue)
{
return(false);
}
args[0] = Literal.FromValue(left);
return(true);
}
else
{
Decimal left = (Decimal)Convert.ChangeType(((Literal)args[0]).ParseValue(), typeof(Decimal));
Decimal right = EvaluateForward(left);
if (@object == null)
{
@object = Literal.FromValue(right);
return(true);
}
else
{
Decimal right2 = (Decimal)Convert.ChangeType(((Literal)@object).ParseValue(), typeof(Decimal));
return(right == right2);
}
}
} catch (FormatException) {
return(false);
}
}
