TagsSerializer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SharpQuant.ObjectStore
{
 /// <summary>
 /// REMARK: The reason we want to serialize tags into text is that they can be read in a
 /// DB field with another API as opposed to the binary object data
 /// </summary>
 public interface ITagsSerializer
 {
 IDictionary<string, string> Deserialize(string raw);
 string Serialize(IDictionary<string, string> info);
 }

 /// <summary>
 /// Simplistic but fast INI-like serializer. No special characters allowed.
 /// </summary>
 public class INITagsSerializer : ITagsSerializer
 {
 private string _valueSeparator = "]=[";
 private char _itemSeparator = '\n';

 public IDictionary<string, string> Deserialize(string raw)
 {
 var dict = new Dictionary<string, string>();

 if (string.IsNullOrEmpty(raw))
 return dict;

 string[] items = raw.Split(_itemSeparator);
 foreach (var item in items)
 {
 int pos = item.IndexOf(_valueSeparator);
 string key = item.Substring(1, pos - 1);
 string value = item.Substring(pos + 3, item.Length - pos - 4);

 dict.Add(key, value);
 }

 return dict;
 }

 public string Serialize(IDictionary<string, string> info)
 {
 StringBuilder sb = new StringBuilder();
 foreach (var item in info)
 {
 sb.Append("[");
 sb.Append(item.Key);
 sb.Append(_valueSeparator);
 sb.Append(item.Value);
 sb.Append("]");
 sb.Append(_itemSeparator);
 }
 if (sb.Length > 1) return sb.ToString(0, sb.Length - 1);
 return string.Empty;
 }
 }

 /// <summary>
 /// Simplistic but fast JSON-like serializer. No special characters allowed.
 /// </summary>
 public class JSONTagsSerializer : ITagsSerializer
 {
 public IDictionary<string, string> Deserialize(string raw)
 {
 var dict = new Dictionary<string, string>();

 if (string.IsNullOrEmpty(raw))
 return dict;

 var lines = raw.Split(',');
 int n = lines.Length;

 for (int i = 0; i < n; i++)
 {
 var vt = lines[i].Split(':');
 if (i == 0)
 vt[0] = vt[0].Substring(1); //remove {
 if (i == n - 1)
 vt[1] = vt[1].Substring(0, vt[1].Length - 1); //remove }
 dict.Add(vt[0].Substring(1, vt[0].Length - 2), vt[1].Substring(1, vt[1].Length - 2)); //remove "
 }
 return dict;
 }

 public string Serialize(IDictionary<string, string> info)
 {
 StringBuilder sb = new StringBuilder();
 sb.Append("{");
 foreach (var item in info)
 {
 sb.Append("\"");
 sb.Append(item.Key);
 sb.Append("\":\"");
 sb.Append(item.Value);
 sb.Append("\",");
 }
 if (sb.Length > 1) sb.Length = sb.Length - 1; //remove last comma
 sb.Append("}");
 if (sb.Length > 1) return sb.ToString(0, sb.Length - 1);
 return string.Empty;
 }
 }
}