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

Class HandlerFieldStrategy

java.lang.Object

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

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

org.apache.openjpa.jdbc.meta.strats.HandlerFieldStrategy

All Implemented Interfaces:

Serializable, Embeddable, FieldStrategy, Joinable, Strategy

Direct Known Subclasses:

MaxEmbeddedBlobFieldStrategy, MaxEmbeddedByteArrayFieldStrategy, MaxEmbeddedCharArrayFieldStrategy, MaxEmbeddedClobFieldStrategy

public class HandlerFieldStrategy
extends AbstractFieldStrategy
implements Joinable, Embeddable

Mapping for a single-valued field that delegates to a ValueHandler.

Since:

0.4.0

Author:

Abe White

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Object[]	_args
protected Column[]	_cols
protected ColumnIO	_io
protected boolean	_load
protected boolean	_lob

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
HandlerFieldStrategy()

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	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.
ColumnIO	getColumnIO()	Return column I/O information for this mapping.
Column[]	getColumns()	The columns managed by this joinable.
int	getFieldIndex()	Return the field index of this joinable, or -1 if not a field.
Object	getJoinValue(Object fieldVal, Column col, JDBCStore store)	Return the join value of the given column.
Object	getJoinValue(OpenJPAStateManager sm, Column col, JDBCStore store)	Return the join value of the given column.
Object	getPrimaryKeyValue(Result res, Column[] cols, ForeignKey fk, JDBCStore store, Joins joins)	Return the value for this joinable from the given result, using the given columns.
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.
boolean	isVersionable()	Return true if this field can be used as part of a state image for optimistic locking.
Joins	join(Joins joins, boolean forceOuter)	Join this value to the class table.
Joins	joinRelation(Joins joins, boolean forceOuter, boolean traverse)	Join this value's table to the table for the related first class object type, if any.
void	load(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch)	Load secondary data using a connection from the store manager.
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)	Load this field value using the given result.
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.
void	setAutoAssignedValue(OpenJPAStateManager sm, JDBCStore store, Column col, Object autoInc)	Use the given auto-assigned value to set this join value's field on the given instance.
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	where(OpenJPAStateManager sm, JDBCStore store, RowManager rm, Object prevValue)	Add a WHERE condition to the row for this field such that the field's current DB value must equal the given previous value.

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

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

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

customDelete, customInsert, customUpdate, getAlias, isCustomDelete, isCustomInsert, isCustomUpdate

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

customDelete, customInsert, customUpdate, getAlias, isCustomDelete, isCustomInsert, isCustomUpdate

Field Details

_cols

protected Column[] _cols

_io

protected ColumnIO _io

_args

protected Object[] _args

_load

protected boolean _load

_lob

protected boolean _lob

Constructor Details

HandlerFieldStrategy

public HandlerFieldStrategy()

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

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)

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)

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

load

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

Description copied from interface: FieldStrategy

Load secondary data using a connection from the store manager.

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

joinRelation

public Joins joinRelation(Joins joins,
 boolean forceOuter,
 boolean traverse)

Description copied from interface: FieldStrategy

Join this value's table to the table for the related first class object type, if any. Does nothing by default.

Specified by:

joinRelation in interface FieldStrategy

Overrides:

joinRelation in class AbstractFieldStrategy

traverse - if true, throw proper exception if it is not possible for this mapping to traverse into the related type

loadProjection

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

Description copied from interface: FieldStrategy

Load this field value using the given result. The result will contain the columns from ValueMapping.getColumns().

Specified by:

loadProjection in interface FieldStrategy

Overrides:

loadProjection in class AbstractFieldStrategy

Throws:

SQLException

isVersionable

public boolean isVersionable()

Description copied from interface: FieldStrategy

Return true if this field can be used as part of a state image for optimistic locking.

Specified by:

isVersionable in interface FieldStrategy

Overrides:

isVersionable in class AbstractFieldStrategy

where

public void where(OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm,
 Object prevValue)
           throws SQLException

Description copied from interface: FieldStrategy

Add a WHERE condition to the row for this field such that the field's current DB value must equal the given previous value. Only versionable mappings must implement this method meaningfully.

Specified by:

where in interface FieldStrategy

Overrides:

where in class AbstractFieldStrategy

Throws:

SQLException

getFieldIndex

public int getFieldIndex()

Description copied from interface: Joinable

Return the field index of this joinable, or -1 if not a field.

Specified by:

getFieldIndex in interface Joinable

getPrimaryKeyValue

public Object getPrimaryKeyValue(Result res,
 Column[] cols,
 ForeignKey fk,
 JDBCStore store,
 Joins joins)
                          throws SQLException

Description copied from interface: Joinable

Return the value for this joinable from the given result, using the given columns. If the given foreign key is non-null, use the foreign key's columns by translating the given columns through ForeignKey.getColumn(org.apache.openjpa.jdbc.schema.Column).

Specified by:

getPrimaryKeyValue in interface Joinable

Throws:

SQLException

getColumns

public Column[] getColumns()

Description copied from interface: Joinable

The columns managed by this joinable.

Specified by:

getColumns in interface Embeddable

Specified by:

getColumns in interface Joinable

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

getJoinValue

public Object getJoinValue(Object fieldVal,
 Column col,
 JDBCStore store)

Description copied from interface: Joinable

Return the join value of the given column.

Specified by:

getJoinValue in interface Joinable

Parameters:

fieldVal - the value of the field for this joinable

col - the column of this joinable whose value to return

getJoinValue

public Object getJoinValue(OpenJPAStateManager sm,
 Column col,
 JDBCStore store)

Description copied from interface: Joinable

Return the join value of the given column.

Specified by:

getJoinValue in interface Joinable

Parameters:

sm - the instance from which to get the value

col - the column whose value to return

setAutoAssignedValue

public void setAutoAssignedValue(OpenJPAStateManager sm,
 JDBCStore store,
 Column col,
 Object autoInc)

Description copied from interface: Joinable

Use the given auto-assigned value to set this join value's field on the given instance.

Specified by:

setAutoAssignedValue in interface Joinable

getColumnIO

public ColumnIO getColumnIO()

Description copied from interface: Embeddable

Return column I/O information for this mapping.

Specified by:

getColumnIO 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