Method updateParentPointer

src/java/simpledb/index/BTreeFile.java:450–460

Helper function to update the parent pointer of a node. @param tid - the transaction id @param dirtypages - the list of dirty pages which should be updated with all new dirty pages @param pid - id of the parent node @param child - id of the child node to be updated with the parent pointer @throws D

(TransactionId tid, Map<PageId, Page> dirtypages, BTreePageId pid, BTreePageId child)

	 * @throws TransactionAbortedException
	 */
	private void updateParentPointer(TransactionId tid, Map<PageId, Page> dirtypages, BTreePageId pid, BTreePageId child)
			throws DbException, TransactionAbortedException {

		BTreePage p = (BTreePage) getPage(tid, dirtypages, child, Permissions.READ_ONLY);

		if(!p.getParentId().equals(pid)) {
			p = (BTreePage) getPage(tid, dirtypages, child, Permissions.READ_WRITE);
			p.setParentId(pid);
		}

	}
	
	/**
	 * Update the parent pointer of every child of the given page so that it correctly points to