Name Value Pair List : List « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. List

Name Value Pair List

    

// HtmlAgilityPack V1.0 - Simon Mourier <simon underscore mourier at hotmail dot com>
using System;
using System.Collections;



namespace HtmlAgilityPack
{
    internal class NameValuePair
    {
        internal readonly string Name;
        internal string Value;

        internal NameValuePair()
        {
        }

        internal NameValuePair(string name)
            :
            this()
        {
            Name = name;
        }

        internal NameValuePair(string name, string value)
            :
            this(name)
        {
            Value = value;
        }
    }

  internal class NameValuePairList
  {
    internal readonly string Text;
    private ArrayList _allPairs;
    private Hashtable _pairsWithName;

    internal NameValuePairList():
      this(null)
    {
    }

    internal NameValuePairList(string text)
    {
      Text = text;
      _allPairs = new ArrayList();
      _pairsWithName = new Hashtable();

      Parse(text);
    }

    internal string GetNameValuePairValue(string name)
    {
      if (name==null)
        throw new ArgumentNullException();
      ArrayList al = GetNameValuePairs(name);
      if (al==null)
        return null;

      // return first item
      NameValuePair nvp = al[0] as NameValuePair;
      return nvp.Value;
    }

    internal ArrayList GetNameValuePairs(string name)
    {
      if (name==null)
        return _allPairs;
      return _pairsWithName[name] as ArrayList;
    }

    private void Parse(string text)
    {
      _allPairs.Clear();
      _pairsWithName.Clear();
      if (text==null)
        return;

      string[] p = text.Split(';');
      if (p==null)
        return;
      foreach(string pv in p)
      {
        if (pv.Length==0)
          continue;
        string[] onep = pv.Split(new char[]{'='}, 2);
        if (onep==null)
          continue;
        NameValuePair nvp = new NameValuePair(onep[0].Trim().ToLower());
        if (onep.Length<2)
          nvp.Value = "";
        else
          nvp.Value = onep[1];

        _allPairs.Add(nvp);

        // index by name
        ArrayList al = _pairsWithName[nvp.Name] as ArrayList;
        if (al==null)
        {
          al = new ArrayList();
          _pairsWithName[nvp.Name] = al;
        }
        al.Add(nvp);
      }
    }

    internal static string GetNameValuePairsValue(string text, string name)
    {
      NameValuePairList l = new NameValuePairList(text);
      return l.GetNameValuePairValue(name);
    }
  }
}

   
    
    
    
  

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