node
as a child of parent
in the graph. If parent
is null
, node
is added as a child of the (virtual) root node. Fails if the node already exists.
@param node the node to add
@param parent the existing node whose a child is to be added or null
@return true
if add is successful, false otherwise
@throws IllegalArgumentException if node
is null
,or if parent
is not legal in the graph
@throws IllegalMonitorStateException if the current thread is holding a read lock
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