com.redhat.lightblue.assoc.qrew

Class Rewriter

java.lang.Object

com.redhat.lightblue.assoc.qrew.Rewriter

Direct Known Subclasses:

CombineANDsToNIN, CombineINsInOR, CombineNINsInAND, CombineORsToIN, EliminateNOT, EliminateNOTNOT, EliminateNOTOR, EliminateSingleANDOR, ExtendINsInOR, ExtendNINsInAND, PromoteNestedAND, QueryRewriter

public abstract class Rewriter
extends Object

This is the basic interface all query rewriters have to implement. The implementation should inspect the query expression, and return a rewritten version of the query if possible. The implementation should treat the query passed into it as a read-only object, not modifying it directly or indirectly. If there are any modification to the query, a new query object must be returned.

Constructor Summary

Constructors

Constructor and Description
Rewriter()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	dyncast(Class<T> t, QueryExpression q)
abstract QueryExpression	rewrite(QueryExpression q)

Methods inherited from class java.lang.Object

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

Constructor Detail

Rewriter

public Rewriter()

Method Detail

rewrite

public abstract QueryExpression rewrite(QueryExpression q)

dyncast

public static <T> T dyncast(Class<T> t,
            QueryExpression q)