Package org.apache.openjpa.jdbc.meta.strats

Class EmbedFieldStrategy

java.lang.Object

org.apache.openjpa.jdbc.meta.strats.AbstractStrategy

org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy

org.apache.openjpa.jdbc.meta.strats.EmbedFieldStrategy

All Implemented Interfaces:

Serializable, Embeddable, FieldStrategy, Strategy

public class EmbedFieldStrategy
extends AbstractFieldStrategy
implements Embeddable

Mapping for an embedded persistent object.

Since:

0.4.0

Author:

Abe White

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy

field

Fields inherited from interface org.apache.openjpa.jdbc.meta.Embeddable

UNSUPPORTED

Constructor Summary

Constructors

Constructor	Description
EmbedFieldStrategy()

Method Summary

Modifier and Type	Method	Description
void	appendIsNotNull(SQLBuffer sql, Select sel, Joins joins)	Append a where clause to the given statement checking if this value is not null.
void	appendIsNull(SQLBuffer sql, Select sel, Joins joins)	Append a where clause to the given statement checking if this value is null.
void	customDelete(OpenJPAStateManager sm, JDBCStore store)	Override this method to customize flushing this mapping.
void	customInsert(OpenJPAStateManager sm, JDBCStore store)	Override this method to customize flushing this mapping.
void	customUpdate(OpenJPAStateManager sm, JDBCStore store)	Override this method to customize flushing this mapping.
void	delete(OpenJPAStateManager sm, JDBCStore store, RowManager rm)	Set the where values appropriately to delete the proper instance, and set all relations on non-secondary tables as updates.
void	delete(OpenJPAStateManager owner, OpenJPAStateManager sm, JDBCStore store, RowManager rm, Row row)	Delete an embedded object record.
ColumnIO	getColumnIO()	Return column I/O information for this mapping.
Column[]	getColumns()	Return the columns used by this strategy.
Object[]	getResultArguments()	Return the arguments needed to extract datastore values via Result.getObject(java.lang.Object, int, java.lang.Object) for each column.
void	initialize()	Perform caching and other initialization operations.
void	insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)	Set values for the mapping into the proper rows.
void	insert(OpenJPAStateManager owner, OpenJPAStateManager sm, JDBCStore store, RowManager rm, Row row)	Insert an embedded object.
Boolean	isCustomDelete(OpenJPAStateManager sm, JDBCStore store)	Return Boolean.FALSE if this mapping does not customize the delete process, Boolean.TRUE if it does, or null if it does customize the delete, but also relies on the standard delete method being called.
Boolean	isCustomInsert(OpenJPAStateManager sm, JDBCStore store)	Return Boolean.FALSE if this mapping does not customize the insert process, Boolean.TRUE if it does, or null if it does customize the insert, but also relies on the standard insert method being called.
Boolean	isCustomUpdate(OpenJPAStateManager sm, JDBCStore store)	Return Boolean.FALSE if this mapping does not customize the update process, Boolean.TRUE if it does, or null if it does customize the update, but also relies on the standard update method being called.
Joins	join(Joins joins, boolean forceOuter)	Join this value to the class table.
void	load(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Result res)	Load virtual row data; the given result is not guaranteed to contain data for this field, so the field mapping should make sure the result contains its needed column data before loading.
void	loadEmbedded(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Object val)	Load this strategy's field by transforming the given datastore value.
Object	loadProjection(JDBCStore store, JDBCFetchConfiguration fetch, Result res, Joins joins)	Loading embed object without instantiating owner entity
void	map(boolean adapt)	Map the owning mapping using this strategy.
int	select(Select sel, OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, int eagerMode)	Select the virtual row columns of this mapping.
int	supportsSelect(Select sel, int type, OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch)	Return whether this mapping can perform the given select type.
Object	toDataStoreValue(Object val, JDBCStore store)	Translate the given external field value to its datastore equivalent.
Object	toEmbeddedDataStoreValue(Object val, JDBCStore store)	Convert the given Java value to its datastore equivalent.
Object	toEmbeddedObjectValue(Object val)	Convert the given datastore value to its Java equivalent.
void	update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)	Set values for the mapping into the proper rows.
void	update(OpenJPAStateManager owner, OpenJPAStateManager sm, JDBCStore store, RowManager rm, Row row)	Update an embedded object.

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy

appendIndex, appendIsEmpty, appendIsNotEmpty, appendSize, appendType, assertNotMappedBy, isEagerSelectToMany, isVersionable, joinKey, joinKeyRelation, joinRelation, load, loadEagerJoin, loadEagerParallel, loadKeyProjection, selectEagerJoin, selectEagerParallel, setFieldMapping, toKeyDataStoreValue, where

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractStrategy

getAlias

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.jdbc.meta.Strategy

getAlias

Constructor Details

EmbedFieldStrategy

public EmbedFieldStrategy()

Method Details

map

public void map(boolean adapt)

Description copied from interface: Strategy

Map the owning mapping using this strategy.

Specified by:

map in interface Strategy

Overrides:

map in class AbstractStrategy

Parameters:

adapt - if true, use the owning mapping's raw mapping info to set its ORM data; if false, ORM data will already be set

initialize

public void initialize()

Description copied from interface: Strategy

Perform caching and other initialization operations. This method is called after Strategy.map(boolean), and after all related components have been mapped as well.

Specified by:

initialize in interface Strategy

Overrides:

initialize in class AbstractStrategy

insert

public void insert(OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm)
            throws SQLException

Description copied from interface: Strategy

Set values for the mapping into the proper rows. For class mappings, this method will be called only after the corresponding method has been called for all fields of this mapping.

Specified by:

insert in interface Strategy

Overrides:

insert in class AbstractStrategy

Throws:

SQLException

insert

public void insert(OpenJPAStateManager owner,
 OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm,
 Row row)
            throws SQLException

Insert an embedded object.

Parameters:

owner - the owning state manager

sm - the embedded state manager, or null if the value is null

rm - the row manager

row - expected row for this embedded value

Throws:

SQLException

update

public void update(OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm)
            throws SQLException

Description copied from interface: Strategy

Set values for the mapping into the proper rows.

Specified by:

update in interface Strategy

Overrides:

update in class AbstractStrategy

Throws:

SQLException

See Also:

• Strategy.insert(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.sql.RowManager)

update

public void update(OpenJPAStateManager owner,
 OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm,
 Row row)
            throws SQLException

Update an embedded object.

Parameters:

owner - the owning state manager

sm - the embedded state manager, or null if the value is null

rm - the row manager

row - expected row for this embedded value

Throws:

SQLException

delete

public void delete(OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm)
            throws SQLException

Description copied from interface: Strategy

Set the where values appropriately to delete the proper instance, and set all relations on non-secondary tables as updates. This allows foreign key analysis.

Specified by:

delete in interface Strategy

Overrides:

delete in class AbstractStrategy

Throws:

SQLException

See Also:

• Strategy.insert(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.sql.RowManager)

delete

public void delete(OpenJPAStateManager owner,
 OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm,
 Row row)
            throws SQLException

Delete an embedded object record.

Parameters:

owner - the owning state manager

sm - the embedded state manager, or null if not known

rm - the row manager

row - expected row for this embedded value

Throws:

SQLException

isCustomInsert

public Boolean isCustomInsert(OpenJPAStateManager sm,
 JDBCStore store)

Description copied from interface: Strategy

Return Boolean.FALSE if this mapping does not customize the insert process, Boolean.TRUE if it does, or null if it does customize the insert, but also relies on the standard insert method being called. Implement the Strategy.customInsert(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore) method to implement the custom insertion behavior.

Specified by:

isCustomInsert in interface Strategy

Overrides:

isCustomInsert in class AbstractStrategy

isCustomUpdate

public Boolean isCustomUpdate(OpenJPAStateManager sm,
 JDBCStore store)

Description copied from interface: Strategy

Return Boolean.FALSE if this mapping does not customize the update process, Boolean.TRUE if it does, or null if it does customize the update, but also relies on the standard update method being called. Implement the Strategy.customUpdate(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore) method to override the default update behavior.

Specified by:

isCustomUpdate in interface Strategy

Overrides:

isCustomUpdate in class AbstractStrategy

isCustomDelete

public Boolean isCustomDelete(OpenJPAStateManager sm,
 JDBCStore store)

Description copied from interface: Strategy

Return Boolean.FALSE if this mapping does not customize the delete process, Boolean.TRUE if it does, or null if it does customize the delete, but also relies on the standard delete method being called. Implement the Strategy.customDelete(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore) method to override the default deletion behavior.

Specified by:

isCustomDelete in interface Strategy

Overrides:

isCustomDelete in class AbstractStrategy

customInsert

public void customInsert(OpenJPAStateManager sm,
 JDBCStore store)
                  throws SQLException

Description copied from interface: Strategy

Override this method to customize flushing this mapping. For classes, this method must also flush all fields. For fields, this method is called after the owning object is inserted, so if this field is in a row with other fields, that row will already exist.

Specified by:

customInsert in interface Strategy

Overrides:

customInsert in class AbstractStrategy

Throws:

SQLException

customUpdate

public void customUpdate(OpenJPAStateManager sm,
 JDBCStore store)
                  throws SQLException

Description copied from interface: Strategy

Override this method to customize flushing this mapping. For classes, this method must also flush all fields.

Specified by:

customUpdate in interface Strategy

Overrides:

customUpdate in class AbstractStrategy

Throws:

SQLException

customDelete

public void customDelete(OpenJPAStateManager sm,
 JDBCStore store)
                  throws SQLException

Description copied from interface: Strategy

Override this method to customize flushing this mapping. For classes, this method must also flush all fields. For fields, this method will be called after the owning object is deleted.

Specified by:

customDelete in interface Strategy

Overrides:

customDelete in class AbstractStrategy

Throws:

SQLException

supportsSelect

public int supportsSelect(Select sel,
 int type,
 OpenJPAStateManager sm,
 JDBCStore store,
 JDBCFetchConfiguration fetch)

Description copied from interface: FieldStrategy

Return whether this mapping can perform the given select type. Return 0 if the given type is not supported. If the given type is an eager parallel type, return the number of UNIONed selects necessary to fetch the data. Otherwise, return any positive number if the type is supported. The given state manager may be null if selecting multiple instances.

Specified by:

supportsSelect in interface FieldStrategy

Overrides:

supportsSelect in class AbstractFieldStrategy

See Also:

• Select

select

public int select(Select sel,
 OpenJPAStateManager sm,
 JDBCStore store,
 JDBCFetchConfiguration fetch,
 int eagerMode)

Description copied from interface: FieldStrategy

Select the virtual row columns of this mapping.

Specified by:

select in interface FieldStrategy

Overrides:

select in class AbstractFieldStrategy

Parameters:

sel - the select to add to

sm - the instance being loaded, or null if not initialized yet or selecting for multiple instances

store - the current store manager

fetch - fetch configuration

eagerMode - the eager fetch mode to use; this may be more restrictive than the mode of the fetch configuration

Returns:

> 0 if this mapping requires the selected data (if any), 0 if it selected data but does not require it, or < 0 if no data was selected

load

public void load(OpenJPAStateManager sm,
 JDBCStore store,
 JDBCFetchConfiguration fetch,
 Result res)
          throws SQLException

Description copied from interface: FieldStrategy

Load virtual row data; the given result is not guaranteed to contain data for this field, so the field mapping should make sure the result contains its needed column data before loading.

Specified by:

load in interface FieldStrategy

Overrides:

load in class AbstractFieldStrategy

Throws:

SQLException

toDataStoreValue

public Object toDataStoreValue(Object val,
 JDBCStore store)

Description copied from interface: FieldStrategy

Translate the given external field value to its datastore equivalent. If the mapping occupies multiple columns in the datastore, return an object array, else return a single object. Simply returns the given object by default.

Specified by:

toDataStoreValue in interface FieldStrategy

Overrides:

toDataStoreValue in class AbstractFieldStrategy

appendIsNull

public void appendIsNull(SQLBuffer sql,
 Select sel,
 Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking if this value is null.

Specified by:

appendIsNull in interface FieldStrategy

Overrides:

appendIsNull in class AbstractFieldStrategy

appendIsNotNull

public void appendIsNotNull(SQLBuffer sql,
 Select sel,
 Joins joins)

Description copied from interface: FieldStrategy

Append a where clause to the given statement checking if this value is not null.

Specified by:

appendIsNotNull in interface FieldStrategy

Overrides:

appendIsNotNull in class AbstractFieldStrategy

join

public Joins join(Joins joins,
 boolean forceOuter)

Description copied from interface: FieldStrategy

Join this value to the class table. Does nothing by default.

Specified by:

join in interface FieldStrategy

Overrides:

join in class AbstractFieldStrategy

loadProjection

public Object loadProjection(JDBCStore store,
 JDBCFetchConfiguration fetch,
 Result res,
 Joins joins)
                      throws SQLException

Loading embed object without instantiating owner entity

Specified by:

loadProjection in interface FieldStrategy

Overrides:

loadProjection in class AbstractFieldStrategy

Throws:

SQLException

getColumns

public Column[] getColumns()

Description copied from interface: Embeddable

Return the columns used by this strategy.

Specified by:

getColumns in interface Embeddable

getColumnIO

public ColumnIO getColumnIO()

Description copied from interface: Embeddable

Return column I/O information for this mapping.

Specified by:

getColumnIO in interface Embeddable

getResultArguments

public Object[] getResultArguments()

Description copied from interface: Embeddable

Return the arguments needed to extract datastore values via Result.getObject(java.lang.Object, int, java.lang.Object) for each column.

Specified by:

getResultArguments in interface Embeddable

toEmbeddedDataStoreValue

public Object toEmbeddedDataStoreValue(Object val,
 JDBCStore store)

Description copied from interface: Embeddable

Convert the given Java value to its datastore equivalent. If this mapping occupies multiple columns, return an object array with one element per column. For relation id columns, return the state manager the column depends on.

Specified by:

toEmbeddedDataStoreValue in interface Embeddable

toEmbeddedObjectValue

public Object toEmbeddedObjectValue(Object val)

Description copied from interface: Embeddable

Convert the given datastore value to its Java equivalent. If Embeddable.getColumns() returns multiple columns, the given datastore value will be an object array of the corresponding length. This method must only be supported by mappings of embedded id objects. In other cases Embeddable.loadEmbedded(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration, java.lang.Object) will be used instead. Return Embeddable.UNSUPPORTED if this mapping cannot support this method.

Specified by:

toEmbeddedObjectValue in interface Embeddable

loadEmbedded

public void loadEmbedded(OpenJPAStateManager sm,
 JDBCStore store,
 JDBCFetchConfiguration fetch,
 Object val)
                  throws SQLException

Description copied from interface: Embeddable

Load this strategy's field by transforming the given datastore value. If Embeddable.getColumns() returns multiple columns, the given datastore value will be an object array of the corresponding length. The value does not have to be loaded immediately; it may be stored as impl data.

Specified by:

loadEmbedded in interface Embeddable

Throws:

SQLException