Dictionary+OrderTableCheck.swift

extension Dictionary {
    /**
     Check that given Order List is a consistent Order List for given Table:
     
     1. Order and Table have the same amount of Entries
     2. All Keys in Order List are Key in Table and there is no Duplicate
     
     */
    public static func OrderTableSanityCheck(forTable table: [Key:Value], withOrder order: [Key]) -> Bool {
        // sanitize check 1: both need to have the same amount of element
        if table.count != order.count {
            return false
        }
        // sanitize check 2: that event_order contains only valid events and has no duplicate entries
        var dup_table: [Key:Value] = [:]
        for item in order {
            if let res = table[item] {
                // entry exists
                if let _ = dup_table[item] {
                    // pass
                } else {
                    // no duplicate entry
                    dup_table[item] = res
                    continue
                }
            }
            // somethings not right -> kill tables and return
            return false
        }
        return true
    }
    
    /**
     Check that given Order List is a consistent Order List for given Table:
     
     1. Order and Table have the same amount of Entries
     2. All Keys in Order List are Key in Table and there is no Duplicate
     
     */
    public nonmutating func checkOrder(givenBy order: [Key]) -> Bool {
        return Dictionary.OrderTableSanityCheck(forTable: self, withOrder: order)
    }
}