org.apache.geode.cache.lucene

Interface LuceneQueryFactory

public interface LuceneQueryFactory

Factory for configuring a Lucene query. Use this factory to set parameters of the query such as page size, result limit, and query expression. To get an instance of this factory call LuceneService.createLuceneQueryFactory().

To use this factory configure it with the set methods and then call one of the create methods on this class. create(String, String, String, String) creates a query by parsing a query string. create(String, String, LuceneQueryProvider) creates a query based on a custom Lucene Query object.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_LIMIT Default query result limit is 100
static int	DEFAULT_PAGESIZE Default page size of result is 0, which means no pagination

Method Summary

Modifier and Type	Method and Description
<K,V> LuceneQuery<K,V>	create(String indexName, String regionName, LuceneQueryProvider provider) Create a query based on a programmatically constructed Lucene Query.
<K,V> LuceneQuery<K,V>	create(String indexName, String regionName, String queryString, String defaultField) Creates a query based on a query string which is parsed by Lucene's StandardQueryParser.
LuceneQueryFactory	setLimit(int limit) Set maximum number of results for a query.
LuceneQueryFactory	setPageSize(int pageSize) Set page size for a query result.

Field Detail

DEFAULT_LIMIT

static final int DEFAULT_LIMIT

Default query result limit is 100

See Also:

Constant Field Values

DEFAULT_PAGESIZE

static final int DEFAULT_PAGESIZE

Default page size of result is 0, which means no pagination

See Also:

Constant Field Values

Method Detail

setPageSize

LuceneQueryFactory setPageSize(int pageSize)

Set page size for a query result. The default page size is 0 which means no pagination.

Parameters:

pageSize - the page size for a query result

Returns:

this factory

Throws:

IllegalArgumentException - if the value is less than 0

setLimit

LuceneQueryFactory setLimit(int limit)

Set maximum number of results for a query. By default, the limit is set to DEFAULT_LIMIT which is 100.

Parameters:

limit - the maximum number of results for a query

Returns:

this factory

Throws:

IllegalArgumentException - if the value is less than or equal to zero.

create

<K,V> LuceneQuery<K,V> create(String indexName,
                              String regionName,
                              String queryString,
                              String defaultField)

Creates a query based on a query string which is parsed by Lucene's StandardQueryParser. See the javadocs for StandardQueryParser for details on the syntax of the query string. The query string and default field as passed as is to StandardQueryParser.parse(String, String)

Type Parameters:

K - the key type in the query results

V - the value type in the query results

Parameters:

regionName - region name

indexName - index name

queryString - Query string parsed by Lucene's StandardQueryParser

defaultField - default field used by the Lucene's StandardQueryParser

Returns:

LuceneQuery object

create

<K,V> LuceneQuery<K,V> create(String indexName,
                              String regionName,
                              LuceneQueryProvider provider)

Create a query based on a programmatically constructed Lucene Query. This can be used for queries that are not covered by StandardQueryParser, such as range queries.

Because Geode may execute the Lucene query on multiple nodes in parallel and Query is not serializable, this method requires a serializable LuceneQueryProvider that can create a Query on the nodes hosting the Lucene index.

Here's an example of using this method to create a range query on an integer field called "age."

 
   LuceneQuery query = factory.create("index", "region", index -> IntPoint.newRangeQuery("age", 20, 30))
 
 

Type Parameters:

K - the key type in the query results

V - the value type in the query results

Parameters:

indexName - index name

regionName - region name

provider - constructs and provides a Lucene Query.

Returns:

LuceneQuery object