source: branches/New Persistence Exploration/Persistence/Persistence/Default/Decomposers/KeyValuePairDecomposer.cs @ 1419

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using HeuristicLab.Persistence.Core;
using HeuristicLab.Persistence.Interfaces;

namespace HeuristicLab.Persistence.Default.Decomposers {

  [EmptyStorableClass]
  public class KeyValuePairDecomposer : IDecomposer {    

    public bool CanDecompose(Type type) {
      return type.IsGenericType &&
             type.GetGenericTypeDefinition() == 
             typeof (KeyValuePair<int, int>).GetGenericTypeDefinition();
    }

    public IEnumerable<Tag> DeCompose(object o) {      
      Type t = o.GetType();
      yield return new Tag("key", t.GetProperty("Key").GetValue(o, null));
      yield return new Tag("value", t.GetProperty("Value").GetValue(o, null));
    }

    public object CreateInstance(Type type) {
      return null;
    }

    public object Populate(object instance, IEnumerable<Tag> o, Type t) {
      IEnumerator<Tag> iter = o.GetEnumerator();
      iter.MoveNext();
      object key = iter.Current.Value;
      iter.MoveNext();
      object value = iter.Current.Value;
      return Activator.CreateInstance(t, new object[] { key, value });      
    }    
  }

}