Package org.datanucleus.store.rdbms.query

Class PersistentClassROF<T>

java.lang.Object

org.datanucleus.store.rdbms.query.AbstractROF<T>

org.datanucleus.store.rdbms.query.PersistentClassROF<T>

Type Parameters:

T - Type of the persistent object that this creates

All Implemented Interfaces:

ResultObjectFactory<T>

public final class PersistentClassROF<T>
extends AbstractROF<T>

Result-object factory that takes a JDBC ResultSet, a results mapping, and creates a persistable object instance for each row in the ResultSet. We use information in the result set to determine the object type; this can be a discriminator column, or can be a special "NucleusType" column defined just for result processing.

Field Summary

Fields

Modifier and Type	Field	Description
protected int[]	mappedFieldNumbers
protected StatementClassMapping	mappingDefinition
protected java.lang.Class<T>	persistentClass	Persistent class that this factory will generate (may be the root class).
private java.util.Map<java.lang.String,java.lang.Class>	resolvedClasses	Resolved classes for metadata / discriminator keyed by class names.
protected StatementClassMapping	resultMapping	Mapping of the results to members of this class (and sub-objects).
protected ResultSetGetter	resultSetGetter
protected org.datanucleus.metadata.AbstractClassMetaData	rootCmd	Metadata for the (root) persistable candidate class.

Fields inherited from class org.datanucleus.store.rdbms.query.AbstractROF

ec, fp, ignoreCache, rs, updateAllFields

Constructor Summary

Constructors

Constructor	Description
PersistentClassROF(org.datanucleus.ExecutionContext ec, java.sql.ResultSet rs, org.datanucleus.FetchPlan fp, StatementClassMapping resultMapping, org.datanucleus.metadata.AbstractClassMetaData acmd, java.lang.Class<T> persistentClass)	Constructor.

Method Summary

Modifier and Type	Method	Description
private T	findObjectWithIdAndLoadFields(java.lang.Object id, int[] membersToLoad, int[] membersToStore, java.lang.Class<?> pcClass, org.datanucleus.metadata.AbstractClassMetaData cmd, java.lang.Object surrogateVersion)	Method to lookup an object for an id, and specify its FieldValues using the ResultSet.
T	getObject()	Method to convert the current ResultSet row into a persistable Object.
java.sql.ResultSet	getResultSet()	Accessor for the JDBC ResultSet being processed.

Methods inherited from class org.datanucleus.store.rdbms.query.AbstractROF

setIgnoreCache, setUpdateAllFields

Methods inherited from class java.lang.Object

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

Field Detail

rootCmd

protected final org.datanucleus.metadata.AbstractClassMetaData rootCmd

Metadata for the (root) persistable candidate class.

persistentClass

protected java.lang.Class<T> persistentClass

Persistent class that this factory will generate (may be the root class).

resultMapping

protected StatementClassMapping resultMapping

Mapping of the results to members of this class (and sub-objects).

resultSetGetter

protected ResultSetGetter resultSetGetter

mappingDefinition

protected StatementClassMapping mappingDefinition

mappedFieldNumbers

protected int[] mappedFieldNumbers

resolvedClasses

private java.util.Map<java.lang.String,java.lang.Class> resolvedClasses

Resolved classes for metadata / discriminator keyed by class names.

Constructor Detail

PersistentClassROF

public PersistentClassROF(org.datanucleus.ExecutionContext ec,
                          java.sql.ResultSet rs,
                          org.datanucleus.FetchPlan fp,
                          StatementClassMapping resultMapping,
                          org.datanucleus.metadata.AbstractClassMetaData acmd,
                          java.lang.Class<T> persistentClass)

Constructor.

Parameters:

ec - ExecutionContext

rs - ResultSet being processed

fp - FetchPlan

resultMapping - Mapping information for the result set and how it maps to the class

acmd - MetaData for the (root) candidate class

persistentClass - Class that this factory will create instances of (or subclasses)

Method Detail

getResultSet

public java.sql.ResultSet getResultSet()

Description copied from interface: ResultObjectFactory

Accessor for the JDBC ResultSet being processed.

Specified by:

getResultSet in interface ResultObjectFactory<T>

Overrides:

getResultSet in class AbstractROF<T>

Returns:

The ResultSet

getObject

public T getObject()

Method to convert the current ResultSet row into a persistable Object.

Returns:

The persistable object.

findObjectWithIdAndLoadFields

private T findObjectWithIdAndLoadFields(java.lang.Object id,
                                        int[] membersToLoad,
                                        int[] membersToStore,
                                        java.lang.Class<?> pcClass,
                                        org.datanucleus.metadata.AbstractClassMetaData cmd,
                                        java.lang.Object surrogateVersion)

Method to lookup an object for an id, and specify its FieldValues using the ResultSet. Works for all identity types.

Parameters:

id - The identity (DatastoreId, Application id, or SCOID when nondurable)

membersToLoad - Absolute numbers of members to load

membersToStore - Absolute numbers of members to store in StateManager (for later)

pcClass - The class of the required object if known

cmd - Metadata for the type

surrogateVersion - The version when the object has a surrogate version field

Returns:

The persistable object for this id