RelationStrategies (OpenJPA Parent POM 2.4.3 API)

Constructors
Constructor and Description
`RelationStrategies()`

Methods
Modifier and Type	Method and Description
`static OpenJPAStateManager`	`getStateManager(Object obj, StoreContext ctx)` Return the state manager for the given instance, using a detached state manager if the instnace is not managed.
`static boolean`	`isRelationId(Column[] cols)` Affirms if all of the given columns represent a relationship identifier.
`static boolean`	`isRelationId(ForeignKey fk)` Affirms if all of the foreign key columns represent a relationship identifier.
`static void`	`mapRelationToUnmappedPC(ValueMapping vm, DBIdentifier name, boolean adapt)`
`static void`	`mapRelationToUnmappedPC(ValueMapping vm, String name, boolean adapt)` Map a logical foreign key to an unmapped base class relation.
`static Object`	`toDataStoreValue(ValueMapping vm, Object val, JDBCStore store)` Return the given object as its foreign key values.
`static MetaDataException`	`uninversable(ValueMapping vm)` Return an exception indicating that the relation is invalid because it has is based on an inverse foreign key and has independent subclasses.
`static MetaDataException`	`unjoinable(ValueMapping vm)` Return an exception indicating that we cannot join to the given relation.
`static MetaDataException`	`unloadable(ValueMapping vm)` Return an exception indicating that the relation cannot be loaded because it has independent subclasses and does not represent a full oid.

unjoinable
```
public static MetaDataException unjoinable(ValueMapping vm)
```
Return an exception indicating that we cannot join to the given relation.

unloadable
```
public static MetaDataException unloadable(ValueMapping vm)
```
Return an exception indicating that the relation cannot be loaded because it has independent subclasses and does not represent a full oid.

uninversable
```
public static MetaDataException uninversable(ValueMapping vm)
```
Return an exception indicating that the relation is invalid because it has is based on an inverse foreign key and has independent subclasses.

public static Object toDataStoreValue(ValueMapping vm,
                      Object val,
                      JDBCStore store)

Return the given object as its foreign key values.

See Also:: FieldStrategy.toDataStoreValue(java.lang.Object, org.apache.openjpa.jdbc.kernel.JDBCStore)

public static void mapRelationToUnmappedPC(ValueMapping vm,
                           String name,
                           boolean adapt)

Map a logical foreign key to an unmapped base class relation.

public static void mapRelationToUnmappedPC(ValueMapping vm,
                           DBIdentifier name,
                           boolean adapt)

public static OpenJPAStateManager getStateManager(Object obj,
                                  StoreContext ctx)

Return the state manager for the given instance, using a detached state manager if the instnace is not managed.

isRelationId
```
public static boolean isRelationId(Column[] cols)
```
Affirms if all of the given columns represent a relationship identifier.

isRelationId
```
public static boolean isRelationId(ForeignKey fk)
```
Affirms if all of the foreign key columns represent a relationship identifier.

Class RelationStrategies