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| public static class LinqHierarchicalExtension
{
/// <summary>
/// Convert an <see cref="System.Web.Collections.Generics.IEnumerable<T>"/> to a IHierarchicalEnumerable.
/// </summary>
/// <typeparam name="TElement">The type of the element.</typeparam>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <param name="elements">The original elements.</param>
/// <param name="getCurrentID">The method to obtain the current node's ID.</param>
/// <param name="getParentID">The method for obtain the current node's parent ID.</param>
/// <param name="getPath">The method to obtain the current node's path.</param>
public static IHierarchicalEnumerable ToHierarchicalEnumerable<TElement, TKey>(this IEnumerable<TElement> elements, Func<TElement, TKey> getCurrentID, Func<TElement, TKey> getParentID)
{
return ToHierarchicalEnumerable(elements, getCurrentID, getParentID, obj => String.Empty, obj => String.Empty);
}
/// <summary>
/// Convert an <see cref="System.Web.Collections.Generics.IEnumerable<T>"/> to a IHierarchicalEnumerable.
/// </summary>
/// <typeparam name="TElement">The type of the element.</typeparam>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <param name="elements">The original elements.</param>
/// <param name="getCurrentID">The method to obtain the current node's ID.</param>
/// <param name="getParentID">The method for obtain the current node's parent ID.</param>
/// <param name="getPath">The method to obtain the current node's path.</param>
public static IHierarchicalEnumerable ToHierarchicalEnumerable<TElement, TKey>(this IEnumerable<TElement> elements, Func<TElement, TKey> getCurrentID, Func<TElement, TKey> getParentID, Func<TElement, String> getType)
{
return ToHierarchicalEnumerable(elements, getCurrentID, getParentID, getType, obj => String.Empty);
}
/// <summary>
/// Convert an <see cref="System.Web.Collections.Generics.IEnumerable<T>"/> to a IHierarchicalEnumerable.
/// </summary>
/// <typeparam name="TElement">The type of the element.</typeparam>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <param name="elements">The original elements.</param>
/// <param name="getCurrentID">The method to obtain the current node's ID.</param>
/// <param name="getParentID">The method for obtain the current node's parent ID.</param>
/// <param name="getPath">The method to obtain the current node's path.</param>
/// <param name="getType">The method to obtain the current node's type.</param>
public static IHierarchicalEnumerable ToHierarchicalEnumerable<TElement, TKey>(this IEnumerable<TElement> elements, Func<TElement, TKey> getCurrentID, Func<TElement, TKey> getParentID, Func<TElement, String> getType, Func<TElement, String> getPath)
{
var addedElements = new Dictionary<TKey, LinqNodeCollection<TElement, TKey>.LinqNode>();
// l'appel de ToList() évite de se balader avec un QueryAble et faire beaucoup de requêtes SQL.
return new LinqNodeCollection<TElement, TKey>(elements.ToList(), getCurrentID, getParentID, getType, getPath, addedElements);
}
}
public sealed class LinqNodeCollection<TElement, TKey> : IHierarchicalEnumerable
{
private Boolean _isRootCollection = false;
private IEnumerable<TElement> _currentElements;
private IEnumerable<TElement> _originalElements;
private Func<TElement, TKey> _getCurrentID;
private Func<TElement, TKey> _getParentID;
private Func<TElement, String> _getType;
private Func<TElement, String> _getPath;
Dictionary<TKey, LinqNode> _addedElements;
/// <summary>
/// Initializes a new instance of the <see cref="LinqNodeCollection<TElement, TKey>"/> class.
/// </summary>
/// <param name="originalElements">All elements of the initial collection.</param>
/// <param name="getCurrentID">The method to obtain the current node's ID.</param>
/// <param name="getParentID">The method for obtain the current node's parent ID.</param>
/// <param name="getPath">The method to obtain the current node's path.</param>
/// <param name="getType">The method to obtain the current node's type.</param>
/// <param name="addedElements">The elements already added to the HierarchicalEnumerable.</param>
public LinqNodeCollection(IEnumerable<TElement> originalElements, Func<TElement, TKey> getCurrentID, Func<TElement, TKey> getParentID, Func<TElement, String> getType, Func<TElement, String> getPath, Dictionary<TKey, LinqNode> addedElements)
: this(originalElements, originalElements, getCurrentID, getParentID, getType, getPath, addedElements)
{
_isRootCollection = true;
}
/// <summary>
/// Initializes a new instance of the <see cref="LinqNodeCollection<TElement, TKey>"/> class.
/// </summary>
/// <param name="originalElements">All elements of the initial collection.</param>
/// <param name="currentElements">Child elements of this current elements (only direct children).</param>
/// <param name="getCurrentID">The method to obtain the current node's ID.</param>
/// <param name="getParentID">The method for obtain the current node's parent ID.</param>
/// <param name="getPath">The method to obtain the current node's path.</param>
/// <param name="getType">The method to obtain the current node's type.</param>
/// <param name="addedElements">The elements already added to the HierarchicalEnumerable.</param>
private LinqNodeCollection(IEnumerable<TElement> originalElements, IEnumerable<TElement> currentElements, Func<TElement, TKey> getCurrentID, Func<TElement, TKey> getParentID, Func<TElement, String> getType, Func<TElement, String> getPath, Dictionary<TKey, LinqNode> addedElements)
{
_currentElements = currentElements;
_originalElements = originalElements;
_getCurrentID = getCurrentID;
_getParentID = getParentID;
_getPath = getPath;
_getType = getType;
_addedElements = addedElements;
}
/// <summary>
/// Gets the hierarchy data.
/// </summary>
/// <param name="enumeratedItem">The enumerated item.</param>
/// <returns></returns>
public IHierarchyData GetHierarchyData(object enumeratedItem)
{
var addedElement = new LinqNode(_originalElements, (TElement)enumeratedItem, _getCurrentID, _getParentID, _getPath, _getType, _addedElements);
_addedElements.Add(_getCurrentID((TElement)enumeratedItem), addedElement);
return addedElement;
}
/// <summary>
/// Gets the enumerator.
/// </summary>
/// <returns></returns>
public IEnumerator GetEnumerator()
{
IEnumerable<TElement> elements = null;
if (_isRootCollection)
{
elements = from e in _currentElements
where _getParentID(e) == null
select e;
}
else
{
elements = _currentElements;
}
foreach (TElement element in elements)
{
if (!_addedElements.ContainsKey(_getCurrentID(element)))
{
yield return element;
}
}
}
public sealed class LinqNode : IHierarchyData
{
// contient la liste de tous les éléments enfants de ce noeud
private IEnumerable<TElement> _children;
// contient tous les éléments de la collection
private IEnumerable<TElement> _allElements;
private TElement _element;
private Func<TElement, TKey> _getCurrentID;
private Func<TElement, TKey> _getParentID;
private Func<TElement, String> _getPath;
private Func<TElement, String> _getType;
// contient tous les noeuds déjà traité
Dictionary<TKey, LinqNode> _addedElements;
/// <summary>
/// Initializes a new instance of the <see cref="LinqNodeCollection<TElement, TKey>.LinqNode"/> class.
/// </summary>
/// <param name="allElements">All elements of the initial collection.</param>
/// <param name="element">The current element of this node.</param>
/// <param name="getCurrentID">The method to obtain the current node's ID.</param>
/// <param name="getParentID">The method for obtain the current node's parent ID.</param>
/// <param name="getPath">The method to obtain the current node's path.</param>
/// <param name="getType">The method to obtain the current node's type.</param>
/// <param name="addedElements">The elements already added to the HierarchicalEnumerable.</param>
internal LinqNode(IEnumerable<TElement> allElements, TElement element,
Func<TElement, TKey> getCurrentID, Func<TElement, TKey> getParentID,
Func<TElement, String> getPath, Func<TElement, String> getType,
Dictionary<TKey, LinqNode> addedElements)
{
_allElements = allElements;
_element = element;
_getCurrentID = getCurrentID;
_getParentID = getParentID;
_getPath = getPath;
_getType = getType;
_addedElements = addedElements;
}
/// <summary>
/// Gets an <see cref="T:System.Web.UI.IHierarchicalEnumerable"/> object that represents the children of current hierarchical node.
/// </summary>
/// <returns></returns>
public IHierarchicalEnumerable GetChildren()
{
ensureGetChildren();
return new LinqNodeCollection<TElement, TKey>(_allElements, _children, _getCurrentID, _getParentID, _getType, _getPath, _addedElements);
}
/// <summary>
/// Gets an <see cref="T:System.Web.UI.IHierarchyData"/> object that represents the parent node of the current hierarchical node.
/// </summary>
/// <returns>
/// An <see cref="T:System.Web.UI.IHierarchyData"/> object that represents the parent node of the current hierarchical node.
/// </returns>
public IHierarchyData GetParent()
{
throw new NotImplementedException();
}
/// <summary>
/// Indicates whether the hierarchical data node that the <see cref="T:System.Web.UI.IHierarchyData"/> object represents has any child nodes.
/// </summary>
/// <value></value>
/// <returns>true if the current node has child nodes; otherwise, false.</returns>
public bool HasChildren
{
get
{
ensureGetChildren();
return _children.Count() > 0;
}
}
/// <summary>
/// Gets the hierarchical data node that the <see cref="T:System.Web.UI.IHierarchyData"/> object represents.
/// </summary>
/// <value></value>
/// <returns>An <see cref="T:System.Object"/> hierarchical data node object.</returns>
public object Item
{
get { return _element; }
}
/// <summary>
/// Gets the hierarchical path of the node.
/// </summary>
/// <value></value>
/// <returns>A <see cref="T:System.String"/> that identifies the hierarchical path relative to the current node.</returns>
public string Path
{
get { return _getPath(_element); }
}
/// <summary>
/// Gets the name of the type of <see cref="T:System.Object"/> contained in the <see cref="P:System.Web.UI.IHierarchyData.Item"/> property.
/// </summary>
/// <value></value>
/// <returns>The name of the type of object that the <see cref="T:System.Web.UI.IHierarchyData"/> object represents.</returns>
public string Type
{
get { return _getType(_element); }
}
private object _lock = new object();
/// <summary>
/// Get children of the current node.
/// </summary>
private void ensureGetChildren()
{
lock (_lock)
{
if (_children == null)
{
_children = from e in _allElements
where _getCurrentID(_element).Equals(_getParentID(e))
select e;
}
}
}
}
} |
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