public IType checkAttribute(Context context, CategoryDeclaration decl, String name)
{
if (decl.Storable && "dbId" == name)
{
return(AnyType.Instance);
}
else if (decl.hasAttribute(context, name))
{
AttributeDeclaration ad = context.getRegisteredDeclaration <AttributeDeclaration>(name);
if (ad == null)
{
throw new SyntaxError("Unknown atttribute:" + name);
}
else
{
return(ad.GetIType(context));
}
}
else if ("text" == name)
{
return(TextType.Instance);
}
else if (decl.hasMethod(context, name))
{
IMethodDeclaration method = decl.getMemberMethods(context, name).GetFirst();
return(new MethodType(method));
}
else
{
throw new SyntaxError("No attribute:" + name + " in category:" + GetTypeName());
}
}
public override Comparer <IValue> getComparer(Context context, IExpression key, bool descending)
{
if (key == null)
{
key = new UnresolvedIdentifier("key", Dialect.E);
}
IDeclaration d = getDeclaration(context);
if (d is CategoryDeclaration)
{
CategoryDeclaration decl = (CategoryDeclaration)d;
if (decl.hasAttribute(context, key.ToString()))
{
return(new AttributeComparer(context, key.ToString(), descending));
}
else if (decl.hasMethod(context, key.ToString()))
{
return(new CategoryMethodComparer(context, key.ToString(), descending));
}
else if (globalMethodExists(context, key.ToString())) // TODO support 2 args
{
return(new GlobalMethodComparer(context, key.ToString(), descending, this));
}
else if (key is ArrowExpression)
{
return(((ArrowExpression)key).GetComparer(context, this, descending));
}
else
{
return(new ExpressionComparer(context, key, descending));
}
}
else
{
throw new Exception("Unsupported!");
}
}