org.openanzo.glitter.query
Interface TreeRewriter

All Known Implementing Classes:

ConjunctiveRewriter, FunctionalPredicateRewriter, NormalFormRewriter, VariableRewriter

public interface TreeRewriter

A TreeRewriter gets handed the nodes of a Glitter abstract syntax tree in a post-order traversal and can rewrite it as it sees fit.

Author:

Lee

Method Summary

TreeNode

rewriteTreeNode(TreeNode node) Rewrites the given node from a SPARQL abstract syntax tree.

Method Detail

rewriteTreeNode

TreeNode rewriteTreeNode(TreeNode node)

Rewrites the given node from a SPARQL abstract syntax tree.

Parameters:

node - the node in question

Returns:

A tree node to replace the passed in tree node. Returning node leaves this spot in the AST unchanged. Returning null removes this node from the tree. (Note that it is possible that removing the node will leave the tree in an invalid state. Behavior in this case is undefined.)