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BaseTreeAdaptorBecomeRoot Method (Object, Object)

If oldRoot is a nil root, just copy or move the children to newRoot. If not a nil root, make oldRoot a child of newRoot.

Namespace:  Stimulsoft.Data.Expressions.Antlr.Runtime.Tree
Assembly:  Stimulsoft.Data (in Stimulsoft.Data.dll) Version: 2019.3.1.0
Syntax
Copy
public virtual Object BecomeRoot(
	Object newRoot,
	Object oldRoot
)

Parameters

newRoot
Type: SystemObject

[Missing <param name="newRoot"/> documentation for "M:Stimulsoft.Data.Expressions.Antlr.Runtime.Tree.BaseTreeAdaptor.BecomeRoot(System.Object,System.Object)"]

oldRoot
Type: SystemObject

[Missing <param name="oldRoot"/> documentation for "M:Stimulsoft.Data.Expressions.Antlr.Runtime.Tree.BaseTreeAdaptor.BecomeRoot(System.Object,System.Object)"]

Return Value

Type: Object

[Missing <returns> documentation for "M:Stimulsoft.Data.Expressions.Antlr.Runtime.Tree.BaseTreeAdaptor.BecomeRoot(System.Object,System.Object)"]

Implements

ITreeAdaptorBecomeRoot(Object, Object)
Remarks
old=^(nil a b c), new=r yields ^(r a b c) old=^(a b c), new=r yields ^(r ^(a b c)) If newRoot is a nil-rooted single child tree, use the single child as the new root node. old=^(nil a b c), new=^(nil r) yields ^(r a b c) old=^(a b c), new=^(nil r) yields ^(r ^(a b c)) If oldRoot was null, it's ok, just return newRoot (even if isNil). old=null, new=r yields r old=null, new=^(nil r) yields ^(nil r) Return newRoot. Throw an exception if newRoot is not a simple node or nil root with a single child node--it must be a root node. If newRoot is ^(nil x) return x as newRoot. Be advised that it's ok for newRoot to point at oldRoot's children; i.e., you don't have to copy the list. We are constructing these nodes so we should have this control for efficiency.
See Also