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.

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

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