org.apache.openjpa.jdbc.meta.strats

Class AbstractClassStrategy

java.lang.Object

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

org.apache.openjpa.jdbc.meta.strats.AbstractClassStrategy

All Implemented Interfaces:

Serializable, ClassStrategy, Strategy

Direct Known Subclasses:

EmbeddedClassStrategy, FlatClassStrategy, FullClassStrategy, NoneClassStrategy, ObjectIdClassStrategy, VerticalClassStrategy

public abstract class AbstractClassStrategy
extends AbstractStrategy
implements ClassStrategy

No-op strategy for easy extension.

Author:

Abe White

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected ClassMapping	cls The owning class mapping.

Constructor Summary

Constructors

Constructor and Description
AbstractClassStrategy()

Method Summary

Modifier and Type	Method and Description
ResultObjectProvider	customLoad(JDBCStore store, boolean subclasses, JDBCFetchConfiguration fetch, long startIdx, long endIdx) Implement this method to customize obtaining a result containing all instances of this class.
boolean	customLoad(OpenJPAStateManager sm, JDBCStore store, JDBCFetchConfiguration fetch, Result result) Implement this method to customize loading from a Result into an instance.
boolean	customLoad(OpenJPAStateManager sm, JDBCStore store, PCState state, JDBCFetchConfiguration fetch) Implement this method to load the state of a given object, without a previous Result.
boolean	isPrimaryKeyObjectId(boolean hasAll) Return true if the this class' primary key columns correspond to the base class' primary key columns used to construct oid values.
Joins	joinSuperclass(Joins joins, boolean toThis) Join the mapping and its superclass.
void	setClassMapping(ClassMapping owner) Set the class mapping using this strategy.
boolean	supportsEagerSelect(Select sel, OpenJPAStateManager sm, JDBCStore store, ClassMapping base, JDBCFetchConfiguration fetch) Return true if this strategy can perform the given select from the given base mapping.

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

customDelete, customInsert, customUpdate, delete, getAlias, initialize, insert, isCustomDelete, isCustomInsert, isCustomUpdate, map, update

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, delete, getAlias, initialize, insert, isCustomDelete, isCustomInsert, isCustomUpdate, map, update

Field Detail

cls

protected ClassMapping cls

The owning class mapping.

Constructor Detail

AbstractClassStrategy

public AbstractClassStrategy()

Method Detail

setClassMapping

public void setClassMapping(ClassMapping owner)

Description copied from interface: ClassStrategy

Set the class mapping using this strategy. This will be called before use.

Specified by:

setClassMapping in interface ClassStrategy

isPrimaryKeyObjectId

public boolean isPrimaryKeyObjectId(boolean hasAll)

Description copied from interface: ClassStrategy

Return true if the this class' primary key columns correspond to the base class' primary key columns used to construct oid values. Base classes always return true. Classes that join to the base class table, though, may not always join using the same columns the base class uses for oid values, or may not use all the columns. When performing a select, we will join down to the most-derived class that is identified by oid values. We cannot use non-primary key field values for joining during selects, because the field values to join on might be the ones we're trying to select! Similarly, we can only reconstruct oid values for selected objects using classes whose primary keys store oid values.

Specified by:

isPrimaryKeyObjectId in interface ClassStrategy

Parameters:

hasAll - if true, there must be a primary key column for every base class primary key column; if false the primary key must only match a subset of the base class primary key columns

joinSuperclass

public Joins joinSuperclass(Joins joins,
                            boolean toThis)

Description copied from interface: ClassStrategy

Join the mapping and its superclass.

Specified by:

joinSuperclass in interface ClassStrategy

toThis - if false, inner join to the superclass table; if true, outer join from the superclass table to this table

supportsEagerSelect

public boolean supportsEagerSelect(Select sel,
                                   OpenJPAStateManager sm,
                                   JDBCStore store,
                                   ClassMapping base,
                                   JDBCFetchConfiguration fetch)

Description copied from interface: ClassStrategy

Return true if this strategy can perform the given select from the given base mapping. The given state manager may be null if selecting multiple instances.

Specified by:

supportsEagerSelect in interface ClassStrategy

customLoad

public ResultObjectProvider customLoad(JDBCStore store,
                                       boolean subclasses,
                                       JDBCFetchConfiguration fetch,
                                       long startIdx,
                                       long endIdx)
                                throws SQLException

Description copied from interface: ClassStrategy

Implement this method to customize obtaining a result containing all instances of this class. Return null for standard loading.

Specified by:

customLoad in interface ClassStrategy

Throws:

SQLException

customLoad

public boolean customLoad(OpenJPAStateManager sm,
                          JDBCStore store,
                          PCState state,
                          JDBCFetchConfiguration fetch)
                   throws SQLException,
                          ClassNotFoundException

Description copied from interface: ClassStrategy

Implement this method to load the state of a given object, without a previous Result. Return true if this method handles the load. If the object does not exist in the data store, simply take no action on it (but still return true). Return false to use default loading.

Specified by:

customLoad in interface ClassStrategy

state - if non-null, then you must initialize the state and persistent object of the given state manager (after determining the actual class of the object from the database, if there are possible persistent subclasses); initialization looks like this: sm.initialize (pcClass, state)

Throws:

SQLException

ClassNotFoundException

customLoad

public boolean customLoad(OpenJPAStateManager sm,
                          JDBCStore store,
                          JDBCFetchConfiguration fetch,
                          Result result)
                   throws SQLException

Description copied from interface: ClassStrategy

Implement this method to customize loading from a Result into an instance. Return true if this mapping handles the load; false if normal loading should proceed after calling this method.

Specified by:

customLoad in interface ClassStrategy

Throws:

SQLException