org.datanucleus.store.cassandra

Class CassandraUtils

java.lang.Object

org.datanucleus.store.cassandra.CassandraUtils

public class CassandraUtils
extends Object

Utility methods for handling Cassandra datastores.

Method Summary

Modifier and Type	Method and Description
static String	getCassandraTypeForDatastoreType(String javaType)
static String	getCassandraTypeForNonPersistableType(Class type, boolean serialised, org.datanucleus.store.types.TypeManager typeMgr, String jdbcType, org.datanucleus.metadata.AbstractMemberMetaData mmd, org.datanucleus.metadata.FieldRole role, org.datanucleus.ClassLoaderResolver clr) Convenience method to return the Cassandra type that we would store the provided type as.
static Object	getDatastoreValueForNonPersistableValue(Object value, String datastoreType, boolean serialised, org.datanucleus.store.types.TypeManager typeMgr, org.datanucleus.metadata.AbstractMemberMetaData mmd, org.datanucleus.metadata.FieldRole role) Convenience method to convert from a non-persistable value to the value to be stored in Cassandra.
static Class	getJavaTypeForCassandraType(String cassandraType)
static Object	getJavaValueForDatastoreValue(Object datastoreValue, String cassandraType, Class javaType, org.datanucleus.ExecutionContext ec)
static Object	getMemberValueForColumnWithConverter(com.datastax.driver.core.Row row, org.datanucleus.store.schema.table.Column column, org.datanucleus.store.types.converters.TypeConverter typeConv)
static Object[]	getObjectArrayFromRow(org.datanucleus.store.types.TypeManager typeMgr, com.datastax.driver.core.Row row, com.datastax.driver.core.ColumnDefinitions columnDefinitions, List<Integer> fieldsMatchingColumnIndexes, int resultRowSize) Convenience method to get Object[] from Cassandra Row.
static Object	getPojoForRowForCandidate(com.datastax.driver.core.Row row, org.datanucleus.metadata.AbstractClassMetaData cmd, org.datanucleus.ExecutionContext ec, int[] fpMembers, boolean ignoreCache) Method to take a ResultSet Row and convert it into a persistable object.
static ResultClassInfo	getResultClassInfoFromColumnDefinitions(Class resultClazz, com.datastax.driver.core.ColumnDefinitions columnDefinitions) Convenience method to generate a ResultClassInfo which holds members that would be used by QueryUtils.createResultObjectUsingDefaultConstructorAndSetters method
static void	logCqlStatement(String stmt, Object[] values, org.datanucleus.util.NucleusLogger logger) Convenience method to log the provided CQL statement, substituting the provided parameters for any "?" in the statement

Methods inherited from class java.lang.Object

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

Method Detail

getJavaTypeForCassandraType

public static Class getJavaTypeForCassandraType(String cassandraType)

getCassandraTypeForDatastoreType

public static String getCassandraTypeForDatastoreType(String javaType)

getMemberValueForColumnWithConverter

public static Object getMemberValueForColumnWithConverter(com.datastax.driver.core.Row row,
                                                          org.datanucleus.store.schema.table.Column column,
                                                          org.datanucleus.store.types.converters.TypeConverter typeConv)

getJavaValueForDatastoreValue

public static Object getJavaValueForDatastoreValue(Object datastoreValue,
                                                   String cassandraType,
                                                   Class javaType,
                                                   org.datanucleus.ExecutionContext ec)

getCassandraTypeForNonPersistableType

public static String getCassandraTypeForNonPersistableType(Class type,
                                                           boolean serialised,
                                                           org.datanucleus.store.types.TypeManager typeMgr,
                                                           String jdbcType,
                                                           org.datanucleus.metadata.AbstractMemberMetaData mmd,
                                                           org.datanucleus.metadata.FieldRole role,
                                                           org.datanucleus.ClassLoaderResolver clr)

Convenience method to return the Cassandra type that we would store the provided type as. Note that this does not support container (Collection, Map) types just single value types.

Parameters:

type - The java type

serialised - Whether it should be serialised

typeMgr - The type manager

jdbcType - Any jdbc-type that has been specified to take into account

mmd - The field/property that this is for

role - The role of the field that this value represents (i.e whole field, collection element, map key, etc)

clr - ClassLoader resolver

Returns:

The Cassandra type

getDatastoreValueForNonPersistableValue

public static Object getDatastoreValueForNonPersistableValue(Object value,
                                                             String datastoreType,
                                                             boolean serialised,
                                                             org.datanucleus.store.types.TypeManager typeMgr,
                                                             org.datanucleus.metadata.AbstractMemberMetaData mmd,
                                                             org.datanucleus.metadata.FieldRole role)

Convenience method to convert from a non-persistable value to the value to be stored in Cassandra.

Parameters:

value - Value for the member

datastoreType - Cassandra column type

serialised - Whether the value is to be stored serialised

typeMgr - Type Manager

mmd - The field/property that this is for

role - The role of the field that this value represents (i.e whole field, collection element, map key, etc)

Returns:

The value to be stored

getPojoForRowForCandidate

public static Object getPojoForRowForCandidate(com.datastax.driver.core.Row row,
                                               org.datanucleus.metadata.AbstractClassMetaData cmd,
                                               org.datanucleus.ExecutionContext ec,
                                               int[] fpMembers,
                                               boolean ignoreCache)

Method to take a ResultSet Row and convert it into a persistable object.

Parameters:

row - The results row

cmd - Metadata for the class of which this is an instance (or subclass)

ec - ExecutionContext managing it

fpMembers - FetchPlan members to populate

ignoreCache - Whether to ignore the cache when instantiating this

Returns:

The persistable object for this row.

logCqlStatement

public static void logCqlStatement(String stmt,
                                   Object[] values,
                                   org.datanucleus.util.NucleusLogger logger)

Convenience method to log the provided CQL statement, substituting the provided parameters for any "?" in the statement

Parameters:

stmt - The CQL statement

values - Any parameter values

logger - The logger to log to (at DEBUG level).

getResultClassInfoFromColumnDefinitions

public static ResultClassInfo getResultClassInfoFromColumnDefinitions(Class resultClazz,
                                                                      com.datastax.driver.core.ColumnDefinitions columnDefinitions)

Convenience method to generate a ResultClassInfo which holds members that would be used by QueryUtils.createResultObjectUsingDefaultConstructorAndSetters method

Parameters:

resultClazz - Class type of result class.

columnDefinitions - Cassandra result column definitions.

Returns:

ResultClassPojo

getObjectArrayFromRow

public static Object[] getObjectArrayFromRow(org.datanucleus.store.types.TypeManager typeMgr,
                                             com.datastax.driver.core.Row row,
                                             com.datastax.driver.core.ColumnDefinitions columnDefinitions,
                                             List<Integer> fieldsMatchingColumnIndexes,
                                             int resultRowSize)

Convenience method to get Object[] from Cassandra Row.

Parameters:

typeMgr - TypeManager

row - Row returned from Cassandra driver

columnDefinitions - Cassandra result column definitions.

fieldsMatchingColumnIndexes - indices of ColumnDefinitions that match to a field of resultClass

resultRowSize - size of Object [] that is returned

Returns:

Object[] of results