public NodeEqualityComparer(AssetDiff diffManager)
{
if (diffManager == null)
{
throw new ArgumentNullException("diffManager");
}
this.diffManager = diffManager;
}
/// <summary>
/// Merges the specified assets from <c>base</c> and <c>from2</c> into <c>from1</c>.
/// </summary>
/// <param name="assetDiff">A precomputed asset difference.</param>
/// <param name="mergePolicy">The merge policy.</param>
/// <param name="previewOnly">if set to <c>true</c> then the merge will not change the object.</param>
/// <returns>MergePreviewResult.</returns>
/// <exception cref="System.ArgumentNullException">assetDiff
/// or
/// mergePolicy</exception>
public static MergeResult Merge(AssetDiff assetDiff, MergePolicyDelegate mergePolicy, bool previewOnly = false)
{
if (assetDiff == null)
{
throw new ArgumentNullException("assetDiff");
}
if (mergePolicy == null)
{
throw new ArgumentNullException("mergePolicy");
}
var allDiffs = assetDiff.Compute();
var diff3 = allDiffs.FindDifferences().ToList();
var result = new MergeResult(assetDiff.Asset1);
// Try to merge
foreach (var diff3Node in diff3)
{
Diff3ChangeType changeType;
try
{
changeType = mergePolicy(diff3Node);
if (changeType >= Diff3ChangeType.Conflict)
{
result.Error("Unresolved conflict [{0}] on node [{1}/{2}/{3}]", diff3Node.ChangeType, diff3Node.BaseNode, diff3Node.Asset1Node, diff3Node.Asset2Node);
continue;
}
// If we are in preview only mode, just skip the update
if (previewOnly)
{
continue;
}
// As we are merging into asset1, the only relevant changes can only come from asset2
if (changeType != Diff3ChangeType.MergeFromAsset2)
{
continue;
}
var dataInstance = diff3Node.Asset2Node != null ? diff3Node.Asset2Node.Instance : null;
// Sets the value on the node
diff3Node.ReplaceValue(dataInstance, node => node.Asset1Node, diff3Node.Asset2Node == null);
}
catch (Exception ex)
{
result.Error("Unexpected error while merging [{0}] on node [{1}]", ex, diff3Node.ChangeType, diff3Node.InstanceType);
break;
}
}
return(result);
}
public static Diff3Node Compute(Asset baseAsset, Asset asset1, Asset asset2)
{
var diff3 = new AssetDiff(baseAsset, asset1, asset2);
return(diff3.Compute());
}
/// <summary>
/// Merges the specified assets from <c>base</c> and <c>from2</c> into <c>from1</c>.
/// </summary>
/// <param name="assetDiff">A precomputed asset difference.</param>
/// <param name="mergePolicy">The merge policy.</param>
/// <param name="previewOnly">if set to <c>true</c> then the merge will not change the object.</param>
/// <returns>MergePreviewResult.</returns>
/// <exception cref="System.ArgumentNullException">assetDiff
/// or
/// mergePolicy</exception>
public static MergeResult Merge(AssetDiff assetDiff, MergePolicyDelegate mergePolicy, bool previewOnly = false)
{
if (assetDiff == null)
{
throw new ArgumentNullException("assetDiff");
}
if (mergePolicy == null)
{
throw new ArgumentNullException("mergePolicy");
}
var allDiffs = assetDiff.Compute();
var diff3 = allDiffs.FindDifferences().ToList();
var result = new MergeResult(assetDiff.Asset1);
// Try to merge
foreach (var diff3Node in diff3)
{
Diff3ChangeType changeType;
try
{
changeType = mergePolicy(diff3Node);
if (changeType >= Diff3ChangeType.Conflict)
{
result.Error("Unresolved conflict [{0}] on node [{1}/{2}/{3}]", diff3Node.ChangeType, diff3Node.BaseNode, diff3Node.Asset1Node, diff3Node.Asset2Node);
continue;
}
// If we are in preview only mode, just skip the update
if (previewOnly)
{
continue;
}
object dataInstance = null;
bool replaceValue = false;
switch (changeType)
{
case Diff3ChangeType.MergeFromAsset2:
// Because for collection, the merge is performed by the MergeContainer
// Skip any merge for individual items, as they should have been merged by MergeContainer
// TODO: This is a workaround as FindDifferences().ToList() is giving changes inside collection while we rebuild collection with MergeContainer
if (diff3Node.Parent == null || diff3Node.Parent.Type != Diff3NodeType.Collection)
{
// As we are merging into asset1, the only relevant changes can only come from asset2
dataInstance = diff3Node.Asset2Node?.Instance;
replaceValue = true;
}
break;
case Diff3ChangeType.Children:
MergeContainer(diff3Node, out dataInstance);
replaceValue = dataInstance != null;
break;
default:
continue;
}
// Sets the value on the node
if (replaceValue)
{
diff3Node.ReplaceValue(dataInstance, node => node.Asset1Node);
}
// Applies the override for this node
diff3Node.ApplyOverride();
}
catch (Exception ex)
{
result.Error("Unexpected error while merging [{0}] on node [{1}]", ex, diff3Node.ChangeType, diff3Node.InstanceType);
break;
}
}
if (!previewOnly)
{
foreach (var node in allDiffs.Asset1Node.Children(node => true))
{
if (node.Instance is IDiffProxy)
{
((IDiffProxy)node.Instance).ApplyChanges();
}
}
}
return(result);
}
