private ArchiveNode getArchiveNode(Archive archive) {
		List<GTreeNode> allChildrenList = getChildren();
		for (GTreeNode node : allChildrenList) {
			if (node instanceof ArchiveNode) {
				ArchiveNode archiveNode = (ArchiveNode) node;
				if (archiveNode.archive == archive) {
					return archiveNode;
				}
			}
		}
		return null;
	}
This implementation returns null, since this class is the root of the hierarchy and does
not have an archive.
@see ghidra.app.plugin.core.datamgr.tree.DataTypeTreeNode#getArchiveNode()
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/tree/ArchiveRootNode.java