/// <summary>
/// Returns true if this is a descendant of parent.
/// </summary>
/// <returns>True if this is a descendant of parent.</returns>
/// <param name="parent">parent</param>
public bool IsDescendantOf(HierarchyId parent)
{
if (parent.GetLevel() > GetLevel())
{
return false;
}
for (int i = 0; i < parent.GetLevel(); i++)
{
int cmp = CompareIntArrays(GetNodes()[i], parent.GetNodes()[i]);
if (cmp != 0)
{
return false;
}
}
return true;
}
public HierarchyId GetReparentedValue(HierarchyId oldRoot, HierarchyId newRoot)
{
if (!IsDescendantOf(oldRoot))
{
throw new ArgumentException(
string.Format(CultureInfo.InvariantCulture, GetReparentedValueOldRootExceptionMessage, oldRoot, ToString()), "oldRoot");
}
StringBuilder sb = new StringBuilder();
sb.Append(PathSeparator);
foreach (var node in newRoot.GetNodes())
{
sb.Append(IntArrayToString(node));
sb.Append(PathSeparator);
}
foreach (var node in GetNodes().Skip(oldRoot.GetLevel()))
{
sb.Append(IntArrayToString(node));
sb.Append(PathSeparator);
}
return new HierarchyId(sb.ToString());
}
/// <summary>
/// Compares two HierarchyIds by their values.
/// </summary>
/// <param name="hid1"> a HierarchyId to compare </param>
/// <param name="hid2"> a HierarchyId to compare </param>
/// <returns>
/// A 32-bit signed integer that indicates the lexical relationship between the two comparands.
/// Value Condition Less than zero: hid1 is less than hid2.
/// Zero: hid1 equals hid2.
/// Greater than zero: hid1 is greater than hid2.
/// </returns>
public static int Compare(HierarchyId hid1, HierarchyId hid2)
{
var nodes1 = hid1.GetNodes();
var nodes2 = hid2.GetNodes();
int count = Math.Min(nodes1.Length, nodes2.Length);
for (int i = 0; i < count; i++)
{
var node1 = nodes1[i];
var node2 = nodes2[i];
int cmp = CompareIntArrays(node1, node2);
if (cmp != 0)
return cmp;
}
if (nodes1.Length > count)
return 1;
if (nodes2.Length > count)
return -1;
return 0;
}
/// <summary> /// Compares this instance to a given HierarchyId by their values. /// </summary> /// <param name="other"> the HierarchyId to compare against this instance </param> /// <returns> true if this instance is equal to the given HierarchyId, and false otherwise </returns> public bool Equals(HierarchyId other) => Compare(this, other) == 0;
/// <summary>
/// Returns a child node of the parent.
/// </summary>
/// <param name="child1"> null or the hierarchyid of a child of the current node. </param>
/// <param name="child2"> null or the hierarchyid of a child of the current node. </param>
/// <returns>
/// Returns one child node that is a descendant of the parent.
/// If both child1 and child2 are null, returns a child of parent.
/// If child1 is not null, and child2 is null, returns a child of parent greater than child1.
/// If child2 is not null and child1 is null, returns a child of parent less than child2.
/// If child1 and child2 are not null, returns a child of parent greater than child1 and less than child2.
/// If child1 is not null and not a child of parent, an exception is raised.
/// If child2 is not null and not a child of parent, an exception is raised.
/// If child1 >= child2, an exception is raised.
/// </returns>
public HierarchyId GetDescendant(HierarchyId? child1, HierarchyId? child2)
{
if (child1 != null && (child1.Value.GetLevel() != GetLevel() + 1 || !child1.Value.IsDescendantOf(this)))
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, GetDescendantMostBeChildExceptionMessage, "child1", child1, ToString()), "child1");
if (child2 != null&& (child2.Value.GetLevel() != GetLevel() + 1 || !child2.Value.IsDescendantOf(this)))
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, GetDescendantMostBeChildExceptionMessage, "child2", child1, ToString()), "child2");
if (child1 == null && child2 == null)
return new HierarchyId(ToString() + 1 + PathSeparator);
string hierarchyStr;
if (child1 == null)
{
var result = new HierarchyId(child2.ToString());
var lastNode = result.GetNodes().Last();
//decrease the last part of the last node of the 1nd child
lastNode[lastNode.Length - 1]--;
hierarchyStr = PathSeparator + string.Join(PathSeparator, result.GetNodes().Select(IntArrayToString)) + PathSeparator;
return new HierarchyId(hierarchyStr);
}
if (child2 == null)
{
var result = new HierarchyId(child1.ToString());
var lastNode = result.GetNodes().Last();
//increase the last part of the last node of the 2nd child
lastNode[lastNode.Length - 1]++;
hierarchyStr = PathSeparator + string.Join(PathSeparator, result.GetNodes().Select(IntArrayToString)) + PathSeparator;
return new HierarchyId(hierarchyStr);
}
var child1LastNode = child1.Value.GetNodes().Last();
var child2LastNode = child2.Value.GetNodes().Last();
var cmp = CompareIntArrays(child1LastNode, child2LastNode);
if (cmp >= 0)
{
throw new ArgumentException(
string.Format(CultureInfo.InvariantCulture, GetDescendantChild1MustLessThanChild2ExceptionMessage, child1, child2),
"child1");
}
int firstDiffrenceIdx = 0;
for (; firstDiffrenceIdx < child1LastNode.Length; firstDiffrenceIdx++)
{
if (child1LastNode[firstDiffrenceIdx] < child2LastNode[firstDiffrenceIdx])
{
break;
}
}
child1LastNode = child1LastNode.Take(firstDiffrenceIdx + 1).ToArray();
if(child1LastNode.Length >= firstDiffrenceIdx || child2LastNode.Length >= firstDiffrenceIdx)
{
child1LastNode = child1LastNode.Concat(new[] { 0 }).ToArray();
}
else if (child1LastNode[firstDiffrenceIdx] + 1 < child2LastNode[firstDiffrenceIdx])
{
child1LastNode[firstDiffrenceIdx]++;
}
else
{
child1LastNode = child1LastNode.Concat(new[] { 1 }).ToArray();
}
hierarchyStr = PathSeparator + string.Join(PathSeparator, GetNodes().Select(IntArrayToString)) + PathSeparator + IntArrayToString(child1LastNode) + PathSeparator;
return new HierarchyId(hierarchyStr);
}
