Package 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	Description
protected static Object	createObjectIdentityUsingReflection(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd, Class objectIdClass)	Create a user-defined id instance and fill the fields using reflection.
protected static Object	createSingleFieldIdentity(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd, Class objectIdClass, Class pcClass)	Create a SingleFieldIdentity instance
static Object	getApplicationIdentityForResultSetRow(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd)	Get the application identity for the persistable instance from the passed result set row.
static Object	getDatastoreIdentityForResultSetRow(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd)	Get the datastore identity for the persistable object from the passed result set row.
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 persistent object instance for a class using application identity defined by the provided result set columns
static Object	getObjectForDatastoreIdentity(org.datanucleus.ExecutionContext ec, JavaTypeMapping mapping, ResultSet rs, int[] resultIndexes, org.datanucleus.metadata.AbstractClassMetaData cmd)	Get the persistable object instance for a class using datastore identity defined by result set columns.

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 persistable object instance for a class using datastore identity defined by result set columns.

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 persistable object

getDatastoreIdentityForResultSetRow

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

Get the datastore identity for the persistable object from the passed result set row.

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

getApplicationIdentityForResultSetRow

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

Get the application identity for the persistable instance from the passed result set row.

Parameters:

ec - ExecutionContext

mapping - The Java Type mapping for the instance

rs - the ResultSet

resultIndexes - indexes of the ResultSet for the PK field(s)

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 persistent object instance for a class using application identity defined by the provided result set columns

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 persistent object instance

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

createSingleFieldIdentity

protected static Object createSingleFieldIdentity(org.datanucleus.ExecutionContext ec,
                                                  JavaTypeMapping mapping,
                                                  ResultSet rs,
                                                  int[] resultIndexes,
                                                  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

resultIndexes - the result set index(es)

cmd - the AbstractClassMetaData

objectIdClass - the object id class

pcClass - the persistable class

Returns:

the id

createObjectIdentityUsingReflection

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

Create a user-defined id instance and fill the fields using reflection.

Parameters:

ec - ExecutionContext

mapping - Mapping in which this is returned

rs - the ResultSet

resultIndexes - the result set index(es)

cmd - the AbstractClassMetaData

objectIdClass - the object id class

Returns:

the id