public void MakeDifferentialTree()
{
var struc = new Profile.ProfileStructureComponent();
struc.Element = new List<Profile.ElementComponent>();
struc.Element.Add(new Profile.ElementComponent() { Path = "A.B.C1" });
struc.Element.Add(new Profile.ElementComponent() { Path = "A.B.C1" });
struc.Element.Add(new Profile.ElementComponent() { Path = "A.B.C2" });
struc.Element.Add(new Profile.ElementComponent() { Path = "A.B" });
struc.Element.Add(new Profile.ElementComponent() { Path = "A.B.C1.D" });
struc.Element.Add(new Profile.ElementComponent() { Path = "A.D.F" });
var tree = new DifferentialTreeConstructor(struc).MakeTree();
Assert.IsNotNull(tree);
var nav = new ElementNavigator(tree);
Assert.AreEqual(10, nav.Count);
Assert.IsTrue(nav.MoveToChild("A"));
Assert.IsTrue(nav.MoveToChild("B"));
Assert.IsTrue(nav.MoveToChild("C1"));
Assert.IsTrue(nav.MoveToNext("C1"));
Assert.IsTrue(nav.MoveToNext("C2"));
Assert.IsTrue(nav.MoveToParent()); // 1st A.B
Assert.IsTrue(nav.MoveToNext() && nav.Path == "A.B"); // (now) 2nd A.B
Assert.IsTrue(nav.MoveToChild("C1"));
Assert.IsTrue(nav.MoveToChild("D"));
Assert.IsTrue(nav.MoveToParent()); // A.B.C1
Assert.IsTrue(nav.MoveToParent()); // A.B (2nd)
Assert.IsTrue(nav.MoveToNext() && nav.Path == "A.D");
Assert.IsTrue(nav.MoveToChild("F"));
}
private static bool childNameRepeats(ElementNavigator diff)
{
var isSliced = false;
var currentPath = diff.PathName;
if (diff.MoveToNext())
{
// check whether the next sibling in the differential has the same name,
// that means we're looking at a slice
isSliced = diff.PathName == currentPath;
diff.MoveToPrevious();
}
return(isSliced);
}
private void merge(ElementNavigator snap, ElementNavigator diff)
{
mergeElementAttributes(snap.Current, diff.Current);
// If there are children, move into them, and recursively merge them
if (diff.MoveToFirstChild())
{
if (!snap.HasChildren)
{
// The differential moves into an element that has no children in the base.
// This is allowable if the base's element has a nameReference or a TypeRef,
// in which case needs to be expanded before we can move to the path indicated
// by the differential
expandBaseElement(snap, diff);
}
// Due to how MoveToFirstChild() works, we have to move to the first matching *child*
// when entering the loop for the first time, after that we can look for the next
// matching *sibling*.
bool firstEntry = true;
do
{
if ((firstEntry && !snap.MoveToChild(diff.PathName)) ||
(!firstEntry && !snap.MoveToNext(diff.PathName)))
{
throw Error.InvalidOperation("Differential has a constraint for path {0}, which does not exist in its base", diff.PathName);
}
firstEntry = false;
// Child found in both, merge them
if (childNameRepeats(diff) || diff.Current.IsExtension())
{
// The child in the diff repeats or we recognize it as an extension slice -> we're on the first element of a slice!
mergeSlice(snap, diff);
}
else
{
merge(snap, diff);
}
}while (diff.MoveToNext());
// After the merge, return the diff and snapho back to their original position
diff.MoveToParent();
snap.MoveToParent();
}
}
/// <summary>
/// Insert the children of the current source node under the node pointed to by the destination.
/// </summary>
/// <param name="dest"></param>
/// <param name="source"></param>
/// <returns></returns>
public static bool CopyChildren(this BaseElementNavigator dest, ElementNavigator source)
{
if (dest.HasChildren)
{
return(false); // Protect children from being overwritten
}
if (!source.MoveToFirstChild())
{
return(true); // Nothing to copy, but successful anyway
}
bool firstChild = true;
do
{
var copiedChild = (Profile.ElementComponent)source.Current.DeepCopy();
if (firstChild)
{
// The first time, create a new child in the destination
dest.InsertFirstChild(copiedChild);
firstChild = false;
}
else
{
// Then insert other childs after that
dest.InsertAfter(copiedChild);
}
// If there are nested children in the source, insert them under
// the newly inserted node in the destination
if (source.HasChildren)
{
dest.CopyChildren(source);
}
}while (source.MoveToNext());
// Bring both source & destination back one step to the original parents
source.MoveToParent();
dest.MoveToParent();
return(true);
}
/// <summary>
/// Insert the children of the current source node under the node pointed to by the destination.
/// </summary>
/// <param name="dest"></param>
/// <param name="source"></param>
/// <returns></returns>
public static bool CopyChildren(this BaseElementNavigator dest, ElementNavigator source)
{
if (dest.HasChildren) return false; // Protect children from being overwritten
if (!source.MoveToFirstChild()) return true; // Nothing to copy, but successful anyway
bool firstChild = true;
do
{
var copiedChild = (Profile.ElementComponent)source.Current.DeepCopy();
if (firstChild)
{
// The first time, create a new child in the destination
dest.InsertFirstChild(copiedChild);
firstChild = false;
}
else
// Then insert other childs after that
dest.InsertAfter(copiedChild);
// If there are nested children in the source, insert them under
// the newly inserted node in the destination
if (source.HasChildren) dest.CopyChildren(source);
}
while (source.MoveToNext());
// Bring both source & destination back one step to the original parents
source.MoveToParent();
dest.MoveToParent();
return true;
}
private void merge(ElementNavigator snap, ElementNavigator diff)
{
mergeElementAttributes(snap.Current, diff.Current);
// If there are children, move into them, and recursively merge them
if (diff.MoveToFirstChild())
{
if (!snap.HasChildren)
{
// The differential moves into an element that has no children in the base.
// This is allowable if the base's element has a nameReference or a TypeRef,
// in which case needs to be expanded before we can move to the path indicated
// by the differential
expandBaseElement(snap, diff);
}
// Due to how MoveToFirstChild() works, we have to move to the first matching *child*
// when entering the loop for the first time, after that we can look for the next
// matching *sibling*.
bool firstEntry = true;
do
{
if( (firstEntry && !snap.MoveToChild(diff.PathName)) ||
(!firstEntry && !snap.MoveToNext(diff.PathName)) )
throw Error.InvalidOperation("Differential has a constraint for path {0}, which does not exist in its base", diff.PathName);
firstEntry = false;
// Child found in both, merge them
if (childNameRepeats(diff) || diff.Current.IsExtension())
{
// The child in the diff repeats or we recognize it as an extension slice -> we're on the first element of a slice!
mergeSlice(snap, diff);
}
else
merge(snap, diff);
}
while (diff.MoveToNext());
// After the merge, return the diff and snapho back to their original position
diff.MoveToParent();
snap.MoveToParent();
}
}
private static bool childNameRepeats(ElementNavigator diff)
{
var isSliced = false;
var currentPath = diff.PathName;
if (diff.MoveToNext())
{
// check whether the next sibling in the differential has the same name,
// that means we're looking at a slice
isSliced = diff.PathName == currentPath;
diff.MoveToPrevious();
}
return isSliced;
}
private void mergeSlice(ElementNavigator snap, ElementNavigator diff)
{
// diff is now located at the first repeat of a slice, which is (possibly) the slice entry
// snap is located at the base definition of the element that will become sliced. But snap is not yet sliced.
// Before we start, is the base element sliceable?
if (!snap.Current.IsRepeating() && !isSlicedToOne(diff.Current))
throw Error.InvalidOperation("The slicing entry in the differential at {0} indicates an unbounded slice, but the base element is not a repeating element",
diff.Current.Path);
Profile.ElementComponent slicingEntry;
// Yes, so, first, add the slicing entry to the snapshot.
if (diff.Current.Slicing != null)
{
slicingEntry = createSliceEntry(snap.Current, diff.Current);
snap.InsertBefore(slicingEntry);
if (!diff.MoveToNext(diff.PathName))
throw Error.InvalidOperation("Slicing has no elements beyond the slicing entry"); // currently impossible to happen
}
else
{
// Mmmm....no slicing entry in the differential. This is only alloweable for extension slices, as a shorthand notation.
if (!snap.Current.IsExtension())
throw Error.InvalidOperation("The slice group at {0} does not start with a slice entry element", diff.Current.Path);
// In this case we insert a "prefab" extension slice.
slicingEntry = createExtensionSlicingEntry(snap.Path);
snap.InsertBefore(slicingEntry);
}
snap.MoveToNext();
// The differential and the snapshot are now both positioned on the first "real" slicing content element
// Start by getting an unaltered copy of the current base definition, we need to re-insert a fresh copy
// of it every time we encounter a new slice in the differential
var slicingTemplate = (Profile.ElementComponent)snap.Current.DeepCopy();
var slicingName = snap.PathName;
var first = true;
do
{
if(first)
{
// The first time, we still have the original base definition available to slice
first = false;
}
else
{
snap.InsertAfter((Profile.ElementComponent)slicingTemplate.DeepCopy());
//snap.MoveToNext();
}
merge(snap, diff);
}
while (diff.MoveToNext(slicingName));
if (slicingEntry.Slicing.Rules != Profile.SlicingRules.Closed)
{
// Slices that are open in some form need to repeat the original "base" definition,
// so that the open slices have a place to "fit in"
snap.InsertAfter((Profile.ElementComponent)slicingTemplate.DeepCopy());
}
//TODO: update/check the slice entry's min/max property to match what we've found in the slice group
}
private void mergeSlice(ElementNavigator snap, ElementNavigator diff)
{
// diff is now located at the first repeat of a slice, which is (possibly) the slice entry
// snap is located at the base definition of the element that will become sliced. But snap is not yet sliced.
// Before we start, is the base element sliceable?
if (!snap.Current.IsRepeating() && !isSlicedToOne(diff.Current))
{
throw Error.InvalidOperation("The slicing entry in the differential at {0} indicates an unbounded slice, but the base element is not a repeating element",
diff.Current.Path);
}
Profile.ElementComponent slicingEntry;
// Yes, so, first, add the slicing entry to the snapshot.
if (diff.Current.Slicing != null)
{
slicingEntry = createSliceEntry(snap.Current, diff.Current);
snap.InsertBefore(slicingEntry);
if (!diff.MoveToNext(diff.PathName))
{
throw Error.InvalidOperation("Slicing has no elements beyond the slicing entry"); // currently impossible to happen
}
}
else
{
// Mmmm....no slicing entry in the differential. This is only alloweable for extension slices, as a shorthand notation.
if (!snap.Current.IsExtension())
{
throw Error.InvalidOperation("The slice group at {0} does not start with a slice entry element", diff.Current.Path);
}
// In this case we insert a "prefab" extension slice.
slicingEntry = createExtensionSlicingEntry(snap.Path);
snap.InsertBefore(slicingEntry);
}
snap.MoveToNext();
// The differential and the snapshot are now both positioned on the first "real" slicing content element
// Start by getting an unaltered copy of the current base definition, we need to re-insert a fresh copy
// of it every time we encounter a new slice in the differential
var slicingTemplate = (Profile.ElementComponent)snap.Current.DeepCopy();
var slicingName = snap.PathName;
var first = true;
do
{
if (first)
{
// The first time, we still have the original base definition available to slice
first = false;
}
else
{
snap.InsertAfter((Profile.ElementComponent)slicingTemplate.DeepCopy());
//snap.MoveToNext();
}
merge(snap, diff);
}while (diff.MoveToNext(slicingName));
if (slicingEntry.Slicing.Rules != Profile.SlicingRules.Closed)
{
// Slices that are open in some form need to repeat the original "base" definition,
// so that the open slices have a place to "fit in"
snap.InsertAfter((Profile.ElementComponent)slicingTemplate.DeepCopy());
}
//TODO: update/check the slice entry's min/max property to match what we've found in the slice group
}