com.bigdata.search

Class CountIndexTask<V extends Comparable<V>>

java.lang.Object

com.bigdata.search.AbstractIndexTask<V>

com.bigdata.search.CountIndexTask<V>

Type Parameters:

V - The generic type of the document identifier.

public class CountIndexTask<V extends Comparable<V>>
extends AbstractIndexTask<V>

Procedure reads on the terms index, aggregating data on a per-Hit basis.

The procedure uses an IRangeQuery.rangeIterator(byte[], byte[]) to perform a key range scan for a specific term. The range iterator will automatically issue queries, obtaining a "chunk" of results at a time. Those results are aggregated on the Hit collection, which is maintained in a thread-safe hash map.

Note: An ISimpleSplitHandler imposes the constraint that index partitions may only fall on a term boundary, hence all tuples for any given term will always be found on the same index partition.

Version:

$Id: CountIndexTask.java 6018 2012-02-13 09:48:15Z mrpersonick $

Author:

Bryan Thompson

Field Summary

Fields inherited from class com.bigdata.search.AbstractIndexTask

fromKey, numQueryTerms, queryTerm, queryTermNdx, queryTermWeight, toKey

Constructor Summary

Constructors

Constructor and Description
CountIndexTask(String termText, int termNdx, int numTerms, boolean prefixMatch, double queryTermWeight, FullTextIndex<V> searchEngine) Setup a task that will perform a range scan for entries matching the search term.

Method Summary

Methods

Modifier and Type	Method and Description
long	getRangeCount() Return the range count for this task.

Methods inherited from class java.lang.Object

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

Constructor Detail

CountIndexTask

public CountIndexTask(String termText,
              int termNdx,
              int numTerms,
              boolean prefixMatch,
              double queryTermWeight,
              FullTextIndex<V> searchEngine)

Setup a task that will perform a range scan for entries matching the search term.

Parameters:

termText - The term text for the search term.

termNdx - The index of this term within the overall search.

numTerms - The overall number of search terms.

prefixMatch - When true any term having termText as a prefix will be matched. Otherwise the term must be an exact match for the termText.

queryTermWeight - The weight for the search term.

searchEngine - The search engine.

Method Detail

getRangeCount

public long getRangeCount()

Return the range count for this task.