org.datanucleus.store.rdbms.mapping

Class MappingHelper

java.lang.Object

org.datanucleus.store.rdbms.mapping.MappingHelper

public class MappingHelper
extends Object

Helper class for handling mappings.

Constructor Summary

Constructors

Constructor and Description
MappingHelper()

Method Summary

Modifier and Type	Method and Description
protected static Object	createObjectIdInstanceReflection(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] param, org.datanucleus.metadata.AbstractClassMetaData cmd, Class objectIdClass) Create an object id instance and fill the fields using reflection
protected static Object	createSingleFieldIdentity(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] param, org.datanucleus.metadata.AbstractClassMetaData cmd, Class objectIdClass, Class pcClass) Create a SingleFieldIdentity instance
static int[]	getMappingIndices(int initialPosition, JavaTypeMapping mapping) Convenience method to return an array of positions for datastore columns for the supplied mapping and the initial position value.
protected static Object	getObjectForAbstractClass(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd) Create an object id instance and fill the fields using reflection
static Object	getObjectForApplicationIdentity(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd) Get the object instance for a class using application identity
static Object	getObjectForDatastoreIdentity(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd) Get the object instance for a class using datastore identity

Methods inherited from class java.lang.Object

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

Constructor Detail

MappingHelper

public MappingHelper()

Method Detail

getMappingIndices

public static int[] getMappingIndices(int initialPosition,
                                      JavaTypeMapping mapping)

Convenience method to return an array of positions for datastore columns for the supplied mapping and the initial position value. For example if the mapping has a single datastore column and the initial position is 1 then returns the array {1}.

Parameters:

initialPosition - the initialPosition

mapping - the Mapping

Returns:

an array containing indexes for parameters

getObjectForDatastoreIdentity

public static Object getObjectForDatastoreIdentity(org.datanucleus.ExecutionContext ec,
                                                   JavaTypeMapping mapping,
                                                   ResultSet rs,
                                                   int[] resultIndexes,
                                                   org.datanucleus.metadata.AbstractClassMetaData cmd)

Get the object instance for a class using datastore identity

Parameters:

ec - ExecutionContext

mapping - The mapping in which this is returned

rs - the ResultSet

resultIndexes - indexes for the result set

cmd - the AbstractClassMetaData

Returns:

the id

getObjectForApplicationIdentity

public static Object getObjectForApplicationIdentity(org.datanucleus.ExecutionContext ec,
                                                     JavaTypeMapping mapping,
                                                     ResultSet rs,
                                                     int[] resultIndexes,
                                                     org.datanucleus.metadata.AbstractClassMetaData cmd)

Get the object instance for a class using application identity

Parameters:

ec - ExecutionContext

mapping - The mapping in which this is returned

rs - the ResultSet

resultIndexes - indexes in the result set to retrieve

cmd - the AbstractClassMetaData

Returns:

the id

createSingleFieldIdentity

protected static Object createSingleFieldIdentity(org.datanucleus.ExecutionContext ec,
                                                  JavaTypeMapping mapping,
                                                  ResultSet rs,
                                                  int[] param,
                                                  org.datanucleus.metadata.AbstractClassMetaData cmd,
                                                  Class objectIdClass,
                                                  Class pcClass)

Create a SingleFieldIdentity instance

Parameters:

ec - ExecutionContext

mapping - Mapping in which this is returned

rs - the ResultSet

param - the parameters

cmd - the AbstractClassMetaData

objectIdClass - the object id class

pcClass - the persistable class

Returns:

the id

createObjectIdInstanceReflection

protected static Object createObjectIdInstanceReflection(org.datanucleus.ExecutionContext ec,
                                                         JavaTypeMapping mapping,
                                                         ResultSet rs,
                                                         int[] param,
                                                         org.datanucleus.metadata.AbstractClassMetaData cmd,
                                                         Class objectIdClass)

Create an object id instance and fill the fields using reflection

Parameters:

ec - ExecutionContext

mapping - Mapping in which this is returned

rs - the ResultSet

param - the parameters

cmd - the AbstractClassMetaData

objectIdClass - the object id class

Returns:

the id

getObjectForAbstractClass

protected static Object getObjectForAbstractClass(org.datanucleus.ExecutionContext ec,
                                                  JavaTypeMapping mapping,
                                                  ResultSet rs,
                                                  int[] resultIndexes,
                                                  org.datanucleus.metadata.AbstractClassMetaData cmd)

Create an object id instance and fill the fields using reflection

Parameters:

ec - ExecutionContext

mapping - Mapping in which this is returned

rs - the ResultSet

resultIndexes - indexes of the result set to use

cmd - the AbstractClassMetaData

Returns:

the id