ASTNode[] siblingNodes= StructureSelectionAction.getChildNodes(parent);
ASTNode[] siblingNodes= StructureSelectionAction.getSiblingNodes(node);
	private static ASTNode getPreviousNode(ASTNode parent, ASTNode node){		ASTNode[] siblingNodes= StructureSelectionAction.getChildNodes(parent);		if (siblingNodes == null || siblingNodes.length == 0)			return parent;		if (node == siblingNodes[0]) {			return parent;		} else {			int index= StructureSelectionAction.findIndex(siblingNodes, node);			if (index < 1)				return parent;			return siblingNodes[index - 1];		}	}