org.openanzo.glitter.query.rewriter
Class FunctionalPredicateRewriter

java.lang.Object
  org.openanzo.glitter.query.rewriter.FunctionalPredicateRewriter

All Implemented Interfaces:

TreeRewriter

public class FunctionalPredicateRewriter
extends java.lang.Object
implements TreeRewriter

A FunctionalPredicateRewriter takes a map from predicate URIs to FunctionalPredicate implementations and uses it to rewrite a query node that contains a functional predicate by removing all triple patterns involved in the functional predicate and attaching the functional predicate to the BGP.

Author:

lee

Constructor Summary

FunctionalPredicateRewriter(java.util.Map<java.net.URI,java.lang.Class<? extends FunctionalPredicate>> predicates)
Constructor.

FunctionalPredicateRewriter(java.util.Map<java.net.URI,java.lang.Class<? extends FunctionalPredicate>> predicates, QueryInformation qi)
Constructor

Method Summary

TreeNode

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

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FunctionalPredicateRewriter

public FunctionalPredicateRewriter(java.util.Map<java.net.URI,java.lang.Class<? extends FunctionalPredicate>> predicates)

Constructor.

Parameters:

predicates - Map from functional predicate URIs to functional predicate implementations.

FunctionalPredicateRewriter

public FunctionalPredicateRewriter(java.util.Map<java.net.URI,java.lang.Class<? extends FunctionalPredicate>> predicates,
                                   QueryInformation qi)

Constructor

Parameters:

predicates - Map from functional predicate URIs to functional predicate implementations.

qi - The query information to pass on to the FunctionalPredicate

Method Detail

rewriteTreeNode

public TreeNode rewriteTreeNode(TreeNode node)

Description copied from interface: TreeRewriter

Rewrites the given node from a SPARQL abstract syntax tree.

Specified by:

rewriteTreeNode in interface TreeRewriter

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.)