Package org.apache.solr.search

Class Grouping

java.lang.Object

org.apache.solr.search.Grouping

public class Grouping
extends Object

Basic Solr Grouping infrastructure. Warning NOT thread safe!

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	Grouping.Command<T>	General group command.
class	Grouping.CommandField	A group command for grouping on a field.
class	Grouping.CommandFunc	A command for grouping on a function.
class	Grouping.CommandQuery	A group command for grouping on a query.
static class	Grouping.Format
static class	Grouping.TotalCount

Field Summary

Fields

Modifier and Type	Field	Description
DocList	mainResult

Constructor Summary

Constructors

Constructor	Description
Grouping(SolrIndexSearcher searcher, QueryResult qr, QueryCommand cmd, boolean cacheSecondPassSearch, int maxDocsPercentageToCache, boolean main)

Method Summary

Modifier and Type	Method	Description
void	add(Grouping.Command<?> groupingCommand)
void	addFieldCommand(String field, SolrQueryRequest request)	Adds a field command based on the specified field.
void	addFunctionCommand(String groupByStr, SolrQueryRequest request)
void	addQueryCommand(String groupByStr, SolrQueryRequest request)
void	execute()
List<Grouping.Command<?>>	getCommands()
static int	getMax(int offset, int len, int max)	Returns offset + len if len equals zero or higher.
boolean	isSignalCacheWarning()	Returns whether a cache warning should be send to the client.
Grouping	setDefaultFormat(Grouping.Format defaultFormat)
Grouping	setDefaultTotalCount(Grouping.TotalCount defaultTotalCount)
Grouping	setDocsPerGroupDefault(int docsPerGroupDefault)
Grouping	setGetGroupedDocSet(boolean getGroupedDocSet)
Grouping	setGroupOffsetDefault(int groupOffsetDefault)
Grouping	setGroupSort(org.apache.lucene.search.Sort groupSort)
Grouping	setLimitDefault(int limitDefault)
Grouping	setWithinGroupSort(org.apache.lucene.search.Sort withinGroupSort)

Methods inherited from class java.lang.Object

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

Field Detail

mainResult

public DocList mainResult

Constructor Detail

Grouping

public Grouping(SolrIndexSearcher searcher,
                QueryResult qr,
                QueryCommand cmd,
                boolean cacheSecondPassSearch,
                int maxDocsPercentageToCache,
                boolean main)

Parameters:

cacheSecondPassSearch - Whether to cache the documents and scores from the first pass search for the second pass search.

maxDocsPercentageToCache - The maximum number of documents in a percentage relative from maxdoc that is allowed in the cache. When this threshold is met, the cache is not used in the second pass search.

Method Detail

add

public void add(Grouping.Command<?> groupingCommand)

addFieldCommand

public void addFieldCommand(String field,
                            SolrQueryRequest request)
                     throws SyntaxError

Adds a field command based on the specified field. If the field is not compatible with Grouping.CommandField it invokes the addFunctionCommand(String, org.apache.solr.request.SolrQueryRequest) method.

Parameters:

field - The fieldname to group by.

Throws:

SyntaxError

addFunctionCommand

public void addFunctionCommand(String groupByStr,
                               SolrQueryRequest request)
                        throws SyntaxError

Throws:

SyntaxError

addQueryCommand

public void addQueryCommand(String groupByStr,
                            SolrQueryRequest request)
                     throws SyntaxError

Throws:

SyntaxError

setGroupSort

public Grouping setGroupSort(org.apache.lucene.search.Sort groupSort)

setWithinGroupSort

public Grouping setWithinGroupSort(org.apache.lucene.search.Sort withinGroupSort)

setLimitDefault

public Grouping setLimitDefault(int limitDefault)

setDocsPerGroupDefault

public Grouping setDocsPerGroupDefault(int docsPerGroupDefault)

setGroupOffsetDefault

public Grouping setGroupOffsetDefault(int groupOffsetDefault)

setDefaultFormat

public Grouping setDefaultFormat(Grouping.Format defaultFormat)

setDefaultTotalCount

public Grouping setDefaultTotalCount(Grouping.TotalCount defaultTotalCount)

setGetGroupedDocSet

public Grouping setGetGroupedDocSet(boolean getGroupedDocSet)

getCommands

public List<Grouping.Command<?>> getCommands()

execute

public void execute()
             throws IOException

Throws:

IOException

getMax

public static int getMax(int offset,
                         int len,
                         int max)

Returns offset + len if len equals zero or higher. Otherwise returns max.

Parameters:

offset - The offset

len - The number of documents to return

max - The number of document to return if len < 0 or if offset + len > 0

Returns:

offset + len if len equals zero or higher. Otherwise returns max

isSignalCacheWarning

public boolean isSignalCacheWarning()

Returns whether a cache warning should be send to the client. The value true is returned when the cache is emptied because the caching limits where met, otherwise false is returned.

Returns:

whether a cache warning should be send to the client