Package com.yahoo.prelude.querytransform

Class QueryRewrite

java.lang.Object

com.yahoo.prelude.querytransform.QueryRewrite

public class QueryRewrite
extends Object

Author:

baldersheim

Constructor Summary

Constructors

Constructor	Description
QueryRewrite()

Method Summary

Modifier and Type	Method	Description
static void	collapseSingleComposites(Query query)	Collapses all single-child CompositeItems into their parent item.
static void	optimizeAndNot(Query query)	Optimize multiple NotItems under and or by collapsing them in to one and leaving the positive ones behind in its place and moving itself with the original and as its positive item and the union of all the negative items of all the original NotItems as its negative items.
static void	optimizeByRestrict(Query query)	Optimizes the given query tree based on its Model.getRestrict() parameter, if any.
static void	rewriteSddocname(Query query)	Replaces and SimpleIndexedItem searching in the Hit.SDDOCNAME_FIELD with an item appropriate for the search node.

Methods inherited from class java.lang.Object

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

Constructor Details

QueryRewrite

public QueryRewrite()

Method Details

optimizeAndNot

public static void optimizeAndNot(Query query)

Optimize multiple NotItems under and or by collapsing them in to one and leaving the positive ones behind in its place and moving itself with the original and as its positive item and the union of all the negative items of all the original NotItems as its negative items.

optimizeByRestrict

public static void optimizeByRestrict(Query query)

Optimizes the given query tree based on its Model.getRestrict() parameter, if any.

collapseSingleComposites

public static void collapseSingleComposites(Query query)

Collapses all single-child CompositeItems into their parent item.

rewriteSddocname

public static void rewriteSddocname(Query query)

Replaces and SimpleIndexedItem searching in the Hit.SDDOCNAME_FIELD with an item appropriate for the search node.