/// <summary>
/// Moves the enumerator to the next item.
/// </summary>
/// <returns>True if there is a next item, false otherwise.</returns>
public bool MoveNext()
{
if (this.collectionStack == null)
{
if (this.collection.Count == 0)
{
return(false);
}
this.collectionStack = new Stack();
this.collectionStack.Push(new CollectionSymbol(this.collection));
}
CollectionSymbol symbol = (CollectionSymbol)this.collectionStack.Peek();
if (this.FindNext(symbol))
{
return(true);
}
this.collectionStack.Pop();
if (this.collectionStack.Count == 0)
{
return(false);
}
return(this.MoveNext());
}
/// <summary>
/// Finds the next item from a given symbol.
/// </summary>
/// <param name="symbol">The symbol to start looking from.</param>
/// <returns>True if a next element is found, false otherwise.</returns>
private bool FindNext(CollectionSymbol symbol)
{
object container = symbol.Collection.items[symbol.ContainerIndex];
CollectionItem collectionItem = container as CollectionItem;
if (collectionItem != null)
{
if (symbol.ItemIndex + 1 < collectionItem.Elements.Count)
{
symbol.ItemIndex++;
return(true);
}
}
ElementCollection elementCollection = container as ElementCollection;
if (elementCollection != null && elementCollection.Count > 0 && symbol.ItemIndex == -1)
{
symbol.ItemIndex++;
this.PushCollection(elementCollection);
return(true);
}
symbol.ItemIndex = 0;
for (int i = symbol.ContainerIndex + 1; i < symbol.Collection.items.Count; ++i)
{
object nestedContainer = symbol.Collection.items[i];
CollectionItem nestedCollectionItem = nestedContainer as CollectionItem;
if (nestedCollectionItem != null)
{
if (nestedCollectionItem.Elements.Count > 0)
{
symbol.ContainerIndex = i;
return(true);
}
}
ElementCollection nestedElementCollection = nestedContainer as ElementCollection;
if (nestedElementCollection != null && nestedElementCollection.Count > 0)
{
symbol.ContainerIndex = i;
this.PushCollection(nestedElementCollection);
return(true);
}
}
return(false);
}
/// <summary>
/// Pushes a collection onto the stack.
/// </summary>
/// <param name="collection">The collection to push.</param>
private void PushCollection(ElementCollection collection)
{
if (collection.Count <= 0)
{
throw new ArgumentException(String.Format(
CultureInfo.InvariantCulture,
"Collection has {0} elements. Must have at least one.",
collection.Count));
}
CollectionSymbol symbol = new CollectionSymbol(collection);
this.collectionStack.Push(symbol);
this.FindNext(symbol);
}
/// <summary>
/// Pushes a collection onto the stack.
/// </summary>
/// <param name="elementCollection">The collection to push.</param>
private void PushCollection(ElementCollection elementCollection)
{
if (elementCollection.Count <= 0)
{
throw new ArgumentException(String.Format(
CultureInfo.InvariantCulture,
WixHarvesterStrings.EXP_CollectionMustHaveAtLeastOneElement,
elementCollection.Count));
}
CollectionSymbol symbol = new CollectionSymbol(elementCollection);
this.collectionStack.Push(symbol);
this.FindNext(symbol);
}