org.datanucleus.store.rdbms.mapping.java

Class PersistableMapping

java.lang.Object

org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

org.datanucleus.store.rdbms.mapping.java.MultiMapping

org.datanucleus.store.rdbms.mapping.java.PersistableMapping

All Implemented Interfaces:

MappingCallbacks

Direct Known Subclasses:

PersistableIdMapping

public class PersistableMapping
extends MultiMapping
implements MappingCallbacks

Maps a field storing a persistable object. TODO Move column creation for join table collection/map/array of PC to this class

Field Summary

Fields

Modifier and Type	Field and Description
protected org.datanucleus.metadata.AbstractClassMetaData	cmd ClassMetaData for the represented class; creating a new one on each getObject invoke is expensive

Fields inherited from class org.datanucleus.store.rdbms.mapping.java.MultiMapping

javaTypeMappings, numberOfDatastoreMappings

Fields inherited from class org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

absFieldNumber, datastoreMappings, mmd, referenceMapping, roleForMember, storeMgr, table, type

Constructor Summary

Constructors

Constructor and Description
PersistableMapping() Create a new empty PersistableMapping.

Method Summary

Modifier and Type	Method and Description
Class	getJavaType() Accessor for the java type being mapped.
Object	getObject(org.datanucleus.ExecutionContext ec, ResultSet rs, int[] resultIndexes) Returns an instance of a persistable class.
Object	getValueForDatastoreMapping(org.datanucleus.NucleusContext nucleusCtx, int index, Object value) Method to return the value to be stored in the specified datastore index given the overall value for this java type.
void	initialize(org.datanucleus.metadata.AbstractMemberMetaData mmd, Table table, org.datanucleus.ClassLoaderResolver clr) Initialize this JavaTypeMapping with the given DatastoreAdapter for the given metadata.
void	insertPostProcessing(org.datanucleus.state.ObjectProvider op) Hook so that we can handle any post-processing on the insert of a particular field.
void	postFetch(org.datanucleus.state.ObjectProvider op) Method executed just after a fetch of the owning object, allowing any necessary action to this field and the object stored in it.
void	postInsert(org.datanucleus.state.ObjectProvider op) Method executed just after the insert of the owning object, allowing any necessary action to this field and the object stored in it.
void	postUpdate(org.datanucleus.state.ObjectProvider op) Method executed just afer any update of the owning object, allowing any necessary action to this field and the object stored in it.
void	preDelete(org.datanucleus.state.ObjectProvider op) Method executed just before the owning object is deleted, allowing tidying up of any relation information.
protected void	prepareDatastoreMapping(org.datanucleus.ClassLoaderResolver clr) Method to prepare the PC mapping and add its associated datastore mappings.
void	setObject(org.datanucleus.ExecutionContext ec, PreparedStatement ps, int[] param, Object value) Method to set an object in the datastore.
void	setObject(org.datanucleus.ExecutionContext ec, PreparedStatement ps, int[] param, Object value, org.datanucleus.state.ObjectProvider ownerOP, int ownerFieldNumber) Method to set an object reference (FK) in the datastore.

Methods inherited from class org.datanucleus.store.rdbms.mapping.java.MultiMapping

addJavaTypeMapping, getDatastoreMapping, getDatastoreMappings, getJavaTypeMapping, getNumberOfDatastoreMappings

Methods inherited from class org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

addDatastoreMapping, equals, failureMessage, getAbsoluteFieldNumber, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDouble, getFloat, getInt, getJavaTypeForDatastoreMapping, getLong, getMemberMetaData, getObject, getReferenceMapping, getRoleForMember, getShort, getStoreManager, getString, getTable, getType, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, representableAsStringLiteralInStatement, setAbsFieldNumber, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setMemberMetaData, setReferenceMapping, setRoleForMember, setShort, setString, setTable

Methods inherited from class java.lang.Object

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

Field Detail

cmd

protected org.datanucleus.metadata.AbstractClassMetaData cmd

ClassMetaData for the represented class; creating a new one on each getObject invoke is expensive

Constructor Detail

PersistableMapping

public PersistableMapping()

Create a new empty PersistableMapping. The caller must call one of the initialize methods to initialize the instance with the DatastoreAdapter and its type.

Method Detail

getJavaType

public Class getJavaType()

Description copied from class: JavaTypeMapping

Accessor for the java type being mapped. This is the java type that the mapping represents. Some examples :

• if the field is of type "MyClass" then the mapping will be OIDMapping (or subclass) the javaType will be OID, and the type will be MyClass.
• if the field is of type "int" then the mapping will be IntegerMapping, the javaType will be Integer, and the type will be int.

The "java type" is the java-type name used in the plugin.xml mapping file

Specified by:

getJavaType in class JavaTypeMapping

Returns:

The java type

initialize

public void initialize(org.datanucleus.metadata.AbstractMemberMetaData mmd,
                       Table table,
                       org.datanucleus.ClassLoaderResolver clr)

Initialize this JavaTypeMapping with the given DatastoreAdapter for the given metadata.

Overrides:

initialize in class JavaTypeMapping

Parameters:

mmd - MetaData for the field/property to be mapped (if any)

table - The datastore container storing this mapping (if any)

clr - the ClassLoaderResolver

prepareDatastoreMapping

protected void prepareDatastoreMapping(org.datanucleus.ClassLoaderResolver clr)

Method to prepare the PC mapping and add its associated datastore mappings.

Parameters:

clr - The ClassLoaderResolver

getValueForDatastoreMapping

public Object getValueForDatastoreMapping(org.datanucleus.NucleusContext nucleusCtx,
                                          int index,
                                          Object value)

Method to return the value to be stored in the specified datastore index given the overall value for this java type.

Overrides:

getValueForDatastoreMapping in class JavaTypeMapping

Parameters:

nucleusCtx - Context

index - The datastore index

value - The overall value for this java type

Returns:

The value for this datastore index

setObject

public void setObject(org.datanucleus.ExecutionContext ec,
                      PreparedStatement ps,
                      int[] param,
                      Object value)

Method to set an object in the datastore.

Overrides:

setObject in class JavaTypeMapping

Parameters:

ec - The ExecutionContext

ps - The Prepared Statement

param - The parameter ids in the statement

value - The value to put in the statement at these ids

Throws:

org.datanucleus.exceptions.NotYetFlushedException - if an object hasn't yet been flushed to the datastore

setObject

public void setObject(org.datanucleus.ExecutionContext ec,
                      PreparedStatement ps,
                      int[] param,
                      Object value,
                      org.datanucleus.state.ObjectProvider ownerOP,
                      int ownerFieldNumber)

Method to set an object reference (FK) in the datastore.

Overrides:

setObject in class JavaTypeMapping

Parameters:

ec - The ExecutionContext

ps - The Prepared Statement

param - The parameter ids in the statement

value - The value to put in the statement at these ids

ownerOP - ObjectProvider for the owner object

ownerFieldNumber - Field number of this PC object in the owner

Throws:

org.datanucleus.exceptions.NotYetFlushedException - if an object hasn't yet been flushed to the datastore

getObject

public Object getObject(org.datanucleus.ExecutionContext ec,
                        ResultSet rs,
                        int[] resultIndexes)

Returns an instance of a persistable class. Processes the FK field and generates the id of the object from the result values, and hence the object itself. TODO Pass in the discriminator/version columns also where available

Overrides:

getObject in class JavaTypeMapping

Parameters:

ec - execution context

rs - The ResultSet

resultIndexes - indexes in the ResultSet to retrieve

Returns:

The persistable object

postFetch

public void postFetch(org.datanucleus.state.ObjectProvider op)

Method executed just after a fetch of the owning object, allowing any necessary action to this field and the object stored in it.

Specified by:

postFetch in interface MappingCallbacks

Parameters:

op - ObjectProvider for the owner.

insertPostProcessing

public void insertPostProcessing(org.datanucleus.state.ObjectProvider op)

Description copied from interface: MappingCallbacks

Hook so that we can handle any post-processing on the insert of a particular field. For example with Oracle we need to insert "EMPTY_CLOB" and then immediately after do a SELECT of it and update the contents of the CLOB/BLOB.

Specified by:

insertPostProcessing in interface MappingCallbacks

Parameters:

op - ObjectProvider

postInsert

public void postInsert(org.datanucleus.state.ObjectProvider op)

Method executed just after the insert of the owning object, allowing any necessary action to this field and the object stored in it.

Specified by:

postInsert in interface MappingCallbacks

Parameters:

op - ObjectProvider for the owner

postUpdate

public void postUpdate(org.datanucleus.state.ObjectProvider op)

Method executed just afer any update of the owning object, allowing any necessary action to this field and the object stored in it.

Specified by:

postUpdate in interface MappingCallbacks

Parameters:

op - ObjectProvider for the owner

preDelete

public void preDelete(org.datanucleus.state.ObjectProvider op)

Method executed just before the owning object is deleted, allowing tidying up of any relation information.

Specified by:

preDelete in interface MappingCallbacks

Parameters:

op - ObjectProvider for the owner