Package com.yahoo.search.predicate

Class PredicateIndex

java.lang.Object

com.yahoo.search.predicate.PredicateIndex

@Beta
public class PredicateIndex
extends java.lang.Object

An index of Predicate objects.

Use a PredicateQuery to find the ids of documents that have matching Predicates. Create an instance of PredicateIndex using the PredicateIndexBuilder.

To build a PredicateQuery you add features and rangeFeatures with a 64-bit bitmap specifying which subqueries they appear in.

To perform a search, create a PredicateIndex.Searcher and call its PredicateIndex.Searcher.search(PredicateQuery) method, which returns a stream of Hit objects, each of which contains a document id and a 64-bit bitmap specifying which subqueries the hit is for.

Note that the PredicateIndex is thread-safe, but a PredicateIndex.Searcher is not. Each thread must use its own searcher.

Author:

Magnar Nedland, bjorncs

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	PredicateIndex.Searcher

Method Summary

Modifier and Type	Method	Description
static PredicateIndex	fromInputStream(java.io.DataInputStream in)
void	rebuildPostingListCache()
PredicateIndex.Searcher	searcher()	Create a new searcher.
void	writeToOutputStream(java.io.DataOutputStream out)

Methods inherited from class java.lang.Object

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

Method Detail

rebuildPostingListCache

public void rebuildPostingListCache()

searcher

public PredicateIndex.Searcher searcher()

Create a new searcher.

writeToOutputStream

public void writeToOutputStream(java.io.DataOutputStream out)
                         throws java.io.IOException

Throws:

java.io.IOException

fromInputStream

public static PredicateIndex fromInputStream(java.io.DataInputStream in)
                                      throws java.io.IOException

Throws:

java.io.IOException