/// <summary>
/// Constructs a builder used to build the deserialized collection
/// </summary>
/// <param name="collection">an existing collection object or null for a new collection</param>
/// <param name="list">the list expression</param>
/// <param name="itemType">the type of the items</param>
/// <returns>collection builder</returns>
protected virtual ICollectionBuilder ConstructBuilder(object collection, ArrayExpression list, out Type itemType)
{
Type listType = collection != null?collection.GetType() : list.ResultType;
TypeData typeHandler = Context.GetTypeHandler(listType);
CollectionHandler collHandler = typeHandler.GetCollectionHandler();
itemType = collHandler.GetItemType(listType);
if (itemType == null)
{
throw new Exception("Null item type returned from " + collHandler.GetType() + " for Collection type: " + listType);
}
if (collection != null)
{
return(collHandler.ConstructBuilder(collection));
}
else
{
return(collHandler.ConstructBuilder(listType, list.Items.Count));
}
}
/// <summary>
/// Serializes the data into a json array expression.
/// </summary>
/// <param name="data">the data to serialize</param>
/// <param name="currentPath">the current path to the data</param>
/// <param name="serializer">serializer instance to use to serialize list items</param>
/// <returns>a json array expression representation</returns>
public override Expression GetExpression(object data, JsonPath currentPath, ISerializerHandler serializer)
{
TypeData handler = Context.GetTypeHandler(data.GetType());
CollectionHandler collectionHandler = handler.GetCollectionHandler();
Type elemType = collectionHandler.GetItemType(handler.ForType);
int index = 0;
ArrayExpression expression = new ArrayExpression();
foreach (object value in collectionHandler.GetEnumerable(data))
{
Expression itemExpr = serializer.Serialize(value, currentPath.Append(index));
if (value != null && !ReflectionUtils.AreEquivalentTypes(value.GetType(), elemType))
{
itemExpr = new CastExpression(value.GetType(), itemExpr);
}
expression.Add(itemExpr);
index++;
}
return(expression);
}