public abstract class Attribute {
        private int min;
        private int current;
        private int max;

        public delegate void ChangeAction (int amount);
        public event ChangeAction OnMinChange;
        public event ChangeAction OnCurrentChange;
        public event ChangeAction OnMaxChange;

        public Attribute () {
            this.min = 0;
            this.current = 0;
            this.max = 0;
        }

        public int Min {
            get {
                return this.min;
            }

            set {
                this.min = Math.Min(value, this.max);
                this.current = Math.Max(value, this.current);

                if (this.OnMinChange != null) {
                    this.OnMinChange(value);
                }
            }
        }

        public int Current {
            get {
                return this.current;
            }

            set {
                this.current = Math.Min(value, this.max);
                this.current = Math.Max(value, this.min);

                if (this.OnCurrentChange != null) {
                    this.OnCurrentChange(value);
                }
            }
        }

        public int Max {
            get {
                return this.max;
            }

            set {
                this.max = Math.Max(value, this.min);
                this.current = Math.Min(value, this.current);

                if (this.OnMaxChange != null) {
                    this.OnMaxChange(value);
                }
            }
        }
    }