XML Database ID.cs

ID.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;

public class ID
{
    static Dictionary<string, ID> idTable = new Dictionary<string, ID>();

    private static ID noIDInternal;
    public static ID NoID 
    {
        get
        {
            if (noIDInternal == null)
            {
                noIDInternal = CreateID("");
            }

            return noIDInternal;
        }
    }

    private string str = string.Empty;

    public ID ()
    {
        str = string.Empty;
    }

    private ID (string idString)
    {
        str = idString;
    }

    public static ID CreateID (string idString)
    {
        ID id;
        if (!idTable.TryGetValue(idString, out id)) 
        {
            id = new ID(idString);
            idTable[idString] = id;
        }

        return id;
    }

    public static ID GetID (string idString)
    {
        ID id;
        if (idTable.TryGetValue(idString, out id))
        {
            return id;
        }

        return NoID;
    }

    public static void ClearIDs ()
    {
        idTable.Clear();
    }

    public override string ToString ()
    {
        return str;
    }

    public override bool Equals (System.Object obj)
    {
        if (obj == null)
        {
            return false;
        }

        return System.Object.ReferenceEquals(this, obj);
    }

    public bool Equals (ID id)
    {
        if (id == null)
        {
            return false;
        }

        return System.Object.ReferenceEquals(this, id);
    }

    public override int GetHashCode ()
    {
        return str.GetHashCode();
    }

    public static bool IsNullOrNoID (ID id)
    {
        return id == null || id == NoID;
    }
}