package gw.util

/**
 * Helper class for objects that can alternatively be referenced by a key or identifier. 
 */
abstract class NamedRef<T, C> {

  var _instance : T as readonly Instance
  var _code : C as readonly Code

  private construct() {
  }

  construct(objCode : C) {
    _instance = null
    _code = objCode
  }

  /**
   * Subclasses should implement construct(instance : T), which should
   * call this constructor.
   */
  protected construct(obj : T, objCode : C) {
    _instance = obj
    _code = objCode
  }

  abstract property get DisplayName() : String

  // Pebbles uses this as the Value property for RangeInput items
  override function toString() : String {
    return this.Code != null ? this.Code.toString() : ""
  }

  override function equals(other: Object) : boolean {
    if (this === other) {
      return true
    }
    if (other typeis NamedRef<T, C>) {
      return other.Code == this.Code
    }
    return false
  }

  override function hashCode() : int {
    return this.Code != null ? this.Code.hashCode() : 0
  }

}