org.datanucleus.store.rdbms.query

Class PersistentClassROF<T>

java.lang.Object

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 Object
implements ResultObjectFactory<T>

ResultObjectFactory that takes a JDBC ResultSet and create 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 and Description
protected org.datanucleus.metadata.AbstractClassMetaData	acmd Metadata for the persistent class.
protected org.datanucleus.FetchPlan	fetchPlan Fetch Plan to use when loading fields (if any).
protected StatementClassMapping	stmtMapping Mapping for the statement to members of this class (and sub-objects).
protected RDBMSStoreManager	storeMgr

Constructor Summary

Constructors

Constructor and Description
PersistentClassROF(RDBMSStoreManager storeMgr, org.datanucleus.metadata.AbstractClassMetaData acmd, StatementClassMapping mappingDefinition, boolean ignoreCache, org.datanucleus.FetchPlan fetchPlan, Class<T> persistentClass) Constructor.

Method Summary

Modifier and Type	Method and Description
static Object	getDatastoreIdentityForResultSetRow(org.datanucleus.ExecutionContext ec, org.datanucleus.metadata.AbstractClassMetaData cmd, Class pcClass, boolean inheritanceCheck, ResultSet resultSet, StatementClassMapping mappingDefinition) Method to return the object datastore identity for a row of the result set.
static Object	getIdentityForResultSetRow(RDBMSStoreManager storeMgr, ResultSet resultSet, StatementClassMapping mappingDefinition, org.datanucleus.ExecutionContext ec, org.datanucleus.metadata.AbstractClassMetaData cmd, Class pcClass, boolean inheritanceCheck) Method to return the object identity for a row of the result set.
T	getObject(org.datanucleus.ExecutionContext ec, ResultSet rs) Method to convert the current ResultSet row into an Object.

Methods inherited from class java.lang.Object

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

Field Detail

storeMgr

protected final RDBMSStoreManager storeMgr

acmd

protected final org.datanucleus.metadata.AbstractClassMetaData acmd

Metadata for the persistent class.

stmtMapping

protected StatementClassMapping stmtMapping

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

fetchPlan

protected final org.datanucleus.FetchPlan fetchPlan

Fetch Plan to use when loading fields (if any).

Constructor Detail

PersistentClassROF

public PersistentClassROF(RDBMSStoreManager storeMgr,
                          org.datanucleus.metadata.AbstractClassMetaData acmd,
                          StatementClassMapping mappingDefinition,
                          boolean ignoreCache,
                          org.datanucleus.FetchPlan fetchPlan,
                          Class<T> persistentClass)

Constructor.

Parameters:

storeMgr - RDBMS StoreManager

acmd - MetaData for the class (base class)

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

ignoreCache - Whether to ignore the cache

fetchPlan - the Fetch Plan

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

Method Detail

getObject

public T getObject(org.datanucleus.ExecutionContext ec,
                   ResultSet rs)

Method to convert the current ResultSet row into an Object.

Specified by:

getObject in interface ResultObjectFactory<T>

Parameters:

ec - execution context

rs - The ResultSet from the Query.

Returns:

The (persisted) object.

getIdentityForResultSetRow

public static Object getIdentityForResultSetRow(RDBMSStoreManager storeMgr,
                                                ResultSet resultSet,
                                                StatementClassMapping mappingDefinition,
                                                org.datanucleus.ExecutionContext ec,
                                                org.datanucleus.metadata.AbstractClassMetaData cmd,
                                                Class pcClass,
                                                boolean inheritanceCheck)

Method to return the object identity for a row of the result set.

Parameters:

storeMgr - RDBMS StoreManager

resultSet - Result set

mappingDefinition - Mapping definition for the candidate class

ec - Execution Context

cmd - Metadata for the class

pcClass - The class required

inheritanceCheck - Whether need an inheritance check (may be for a subclass)

Returns:

The identity (if found) or null (if either not sure of inheritance, or not known).

getDatastoreIdentityForResultSetRow

public static Object getDatastoreIdentityForResultSetRow(org.datanucleus.ExecutionContext ec,
                                                         org.datanucleus.metadata.AbstractClassMetaData cmd,
                                                         Class pcClass,
                                                         boolean inheritanceCheck,
                                                         ResultSet resultSet,
                                                         StatementClassMapping mappingDefinition)

Method to return the object datastore identity for a row of the result set. If the class isn't using datastore identity then returns null

Parameters:

ec - Execution Context

cmd - Metadata for the class

pcClass - The class required

inheritanceCheck - Whether need an inheritance check (may be for a subclass)

resultSet - Result set

mappingDefinition - Mapping definition for the candidate class

Returns:

The identity (if found) or null (if either not sure of inheritance, or not known).