public override IValue interpret(Context context)
{
CategoryDeclaration cd = context.getRegisteredDeclaration <CategoryDeclaration>(this.type.GetTypeName());
if (cd == null)
{
throw new SyntaxError("Unknown category " + this.type.GetTypeName());
}
checkFirstHomonym(context, cd);
IInstance instance = type.newInstance(context);
instance.setMutable(true);
try
{
if (copyFrom != null)
{
Object copyObj = copyFrom.interpret(context);
if (copyObj is IInstance)
{
IInstance copyInstance = (IInstance)copyObj;
foreach (String name in copyInstance.GetMemberNames())
{
if (name == "dbId")
{
continue;
}
else if (cd.hasAttribute(context, name))
{
IValue value = copyInstance.GetMemberValue(context, name, false);
if (value != null && value.IsMutable() && !this.type.Mutable)
{
throw new NotMutableError();
}
instance.SetMemberValue(context, name, value);
}
}
}
else if (copyObj is DocumentValue)
{
DocumentValue copyDoc = (DocumentValue)copyObj;
foreach (String name in copyDoc.GetMemberNames())
{
if (name == "dbId")
{
continue;
}
else if (cd.hasAttribute(context, name))
{
IValue value = copyDoc.GetMemberValue(context, name, false);
if (value != null && value.IsMutable() && !this.type.Mutable)
{
throw new NotMutableError();
}
// TODO convert to attribute type, see Java version
instance.SetMemberValue(context, name, value);
}
}
}
}
if (arguments != null)
{
foreach (Argument argument in arguments)
{
IValue value = argument.getExpression().interpret(context);
if (value != null && value.IsMutable() && !this.type.Mutable)
{
throw new NotMutableError();
}
instance.SetMemberValue(context, argument.GetName(), value);
}
}
}
finally
{
instance.setMutable(this.type.Mutable);
}
return(instance);
}