org.apache.openjpa.jdbc.meta.strats
Class MaxEmbeddedLobFieldStrategy

java.lang.Object
  org.apache.openjpa.jdbc.meta.strats.AbstractStrategy
      org.apache.openjpa.jdbc.meta.strats.AbstractFieldStrategy
          org.apache.openjpa.jdbc.meta.strats.HandlerFieldStrategy
              org.apache.openjpa.jdbc.meta.strats.MaxEmbeddedLobFieldStrategy

All Implemented Interfaces:

Serializable, Embeddable, FieldStrategy, Joinable, Strategy

Direct Known Subclasses:

MaxEmbeddedBlobFieldStrategy, MaxEmbeddedByteArrayFieldStrategy, MaxEmbeddedCharArrayFieldStrategy, MaxEmbeddedClobFieldStrategy

abstract class MaxEmbeddedLobFieldStrategy
extends HandlerFieldStrategy

Base class for LOBs on databases that limit the max embedded LOB size.

Since:

0.4.0

Author:

Abe White

Field Summary

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

_args, _cols, _io, _load, _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

MaxEmbeddedLobFieldStrategy()

Method Summary

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.
protected abstract int	getExpectedJavaType() Return the expected type of the field from JavaTypes or JavaSQLTypes.
protected abstract Object	getValue(OpenJPAStateManager sm)
void	insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm) Set values for the mapping into the proper rows.
protected abstract Boolean	isCustom(OpenJPAStateManager sm, JDBCStore store) Return whether this is a custom insert/update.
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.
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.
protected Object	load(Column col, Result res, Joins joins) Load this value from the given result.
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.
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.
protected abstract void	putData(OpenJPAStateManager sm, ResultSet rs, DBDictionary dict) Set the data from the given state manager into the result set.
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.
void	update(OpenJPAStateManager sm, JDBCStore store, RowManager rm) Set values for the mapping into the proper rows.
protected abstract void	update(OpenJPAStateManager sm, Row row) Set the value of the owning field into the given row.
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.HandlerFieldStrategy

appendIsNotNull, appendIsNull, getColumnIO, getColumns, getFieldIndex, getJoinValue, getJoinValue, getPrimaryKeyValue, getResultArguments, initialize, joinRelation, loadEmbedded, setAutoAssignedValue, toDataStoreValue, toEmbeddedDataStoreValue, toEmbeddedObjectValue

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, getAlias, isCustomDelete

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, getAlias, isCustomDelete

Constructor Detail

MaxEmbeddedLobFieldStrategy

MaxEmbeddedLobFieldStrategy()

Method Detail

getExpectedJavaType

protected abstract int getExpectedJavaType()

Return the expected type of the field from JavaTypes or JavaSQLTypes.

update

protected abstract void update(OpenJPAStateManager sm,
                               Row row)
                        throws SQLException

Set the value of the owning field into the given row.

Throws:

SQLException

isCustom

protected abstract Boolean isCustom(OpenJPAStateManager sm,
                                    JDBCStore store)

Return whether this is a custom insert/update.

putData

protected abstract void putData(OpenJPAStateManager sm,
                                ResultSet rs,
                                DBDictionary dict)
                         throws SQLException

Set the data from the given state manager into the result set.

Throws:

SQLException

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 HandlerFieldStrategy

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

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

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 HandlerFieldStrategy

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 HandlerFieldStrategy

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 HandlerFieldStrategy

Throws:

SQLException

See Also:

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

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

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 HandlerFieldStrategy

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 HandlerFieldStrategy

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 HandlerFieldStrategy

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 HandlerFieldStrategy

Throws:

SQLException

load

protected Object load(Column col,
                      Result res,
                      Joins joins)
               throws SQLException

Load this value from the given result.

Throws:

SQLException

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 HandlerFieldStrategy

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 HandlerFieldStrategy

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 HandlerFieldStrategy

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 HandlerFieldStrategy

Throws:

SQLException

getValue

protected abstract Object getValue(OpenJPAStateManager sm)