org.springframework.data.cassandra.core.cql

Class RowMapperResultSetExtractor<T>

java.lang.Object

org.springframework.data.cassandra.core.cql.RowMapperResultSetExtractor<T>

All Implemented Interfaces:

ResultSetExtractor<List<T>>

public class RowMapperResultSetExtractor<T>
extends Object
implements ResultSetExtractor<List<T>>

Adapter implementation of the ResultSetExtractor interface that delegates to a RowMapper which is supposed to create an object for each row. Each object is added to the results List of this ResultSetExtractor.

Useful for the typical case of one object per row in the database table. The number of entries in the results will match the number of rows.

Note that a RowMapper object is typically stateless and thus reusable.

Since:

2.0

Author:

Mark Paluch

See Also:

RowMapper, CqlTemplate

Constructor Summary

Constructors

Constructor and Description
RowMapperResultSetExtractor(RowMapper<T> rowMapper) Create a new RowMapperResultSetExtractor.
RowMapperResultSetExtractor(RowMapper<T> rowMapper, int rowsExpected) Create a new RowMapperResultSetExtractor.

Method Summary

Modifier and Type	Method and Description
List<T>	extractData(com.datastax.oss.driver.api.core.cql.ResultSet resultSet) Implementations must implement this method to process the entire ResultSet.

Methods inherited from class java.lang.Object

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

Constructor Detail

RowMapperResultSetExtractor

public RowMapperResultSetExtractor(RowMapper<T> rowMapper)

Create a new RowMapperResultSetExtractor.

Parameters:

rowMapper - the RowMapper which creates an object for each row, must not be null.

RowMapperResultSetExtractor

public RowMapperResultSetExtractor(RowMapper<T> rowMapper,
                                   int rowsExpected)

Create a new RowMapperResultSetExtractor.

Parameters:

rowMapper - the RowMapper which creates an object for each row, must not be null.

rowsExpected - the number of expected rows (just used for optimized collection handling).

Method Detail

extractData

public List<T> extractData(com.datastax.oss.driver.api.core.cql.ResultSet resultSet)
                    throws com.datastax.oss.driver.api.core.DriverException,
                           DataAccessException

Description copied from interface: ResultSetExtractor

Implementations must implement this method to process the entire ResultSet.

Specified by:

extractData in interface ResultSetExtractor<List<T>>

Parameters:

resultSet - ResultSet to extract data from.

Returns:

an arbitrary result object, or null if none (the extractor will typically be stateful in the latter case).

Throws:

com.datastax.oss.driver.api.core.DriverException - if a DriverException is encountered getting column values or navigating (that is, there's no need to catch DriverException)

DataAccessException - in case of custom exceptions