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

java.lang.Object
  org.apache.openjpa.jdbc.meta.strats.AbstractStrategy
      org.apache.openjpa.jdbc.meta.strats.AbstractDiscriminatorStrategy
          org.apache.openjpa.jdbc.meta.strats.InValueDiscriminatorStrategy

All Implemented Interfaces:

Serializable, DiscriminatorStrategy, Strategy

Direct Known Subclasses:

ClassNameDiscriminatorStrategy, ValueMapDiscriminatorStrategy

public abstract class InValueDiscriminatorStrategy
extends AbstractDiscriminatorStrategy

Base discriminator strategy that determines the class of database records using a column holding a value mapped to a class, and limits SELECTs using an IN (...) statement.

Author:

Abe White

See Also:

Serialized Form

Field Summary

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

disc, isFinal

Constructor Summary

InValueDiscriminatorStrategy()

Method Summary

Class	getClass(JDBCStore store, ClassMapping base, Result res) Return the class for the current result row.
protected abstract Class	getClass(Object val, JDBCStore store) Convert the given discriminator value to the corresponding class.
SQLBuffer	getClassConditions(Select sel, Joins joins, ClassMapping base, boolean subclasses) Return SQL to limit the classes selected as much as possible to the given base class, and optionally its subclasses.
protected abstract Object	getDiscriminatorValue(ClassMapping cls) Return the discriminator value for the given type.
protected abstract int	getJavaType() Return the Java type code from JavaTypes for the discriminator values.
boolean	hasClassConditions(ClassMapping base, boolean subclasses) Whether any class conditions are necessary.
void	insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm) Set values for the mapping into the proper rows.
void	map(boolean adapt) Map the owning mapping using this strategy.
boolean	select(Select sel, ClassMapping mapping) Select the data for this Discriminator.

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

loadSubclasses, setDiscriminator

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

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

Constructor Detail

InValueDiscriminatorStrategy

public InValueDiscriminatorStrategy()

Method Detail

getJavaType

protected abstract int getJavaType()

Return the Java type code from JavaTypes for the discriminator values. This method is only used during mapping installation.

getDiscriminatorValue

protected abstract Object getDiscriminatorValue(ClassMapping cls)

Return the discriminator value for the given type.

getClass

protected abstract Class getClass(Object val,
                                  JDBCStore store)
                           throws ClassNotFoundException

Convert the given discriminator value to the corresponding class.

Throws:

ClassNotFoundException

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

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

select

public boolean select(Select sel,
                      ClassMapping mapping)

Description copied from interface: DiscriminatorStrategy

Select the data for this Discriminator.

Specified by:

select in interface DiscriminatorStrategy

Overrides:

select in class AbstractDiscriminatorStrategy

mapping - the known base class being selected; this may not be the base class in the inheritance hierarchy

Returns:

true if anything was selected; false otherwise

getClass

public Class getClass(JDBCStore store,
                      ClassMapping base,
                      Result res)
               throws SQLException,
                      ClassNotFoundException

Description copied from interface: DiscriminatorStrategy

Return the class for the current result row.

Specified by:

getClass in interface DiscriminatorStrategy

Overrides:

getClass in class AbstractDiscriminatorStrategy

Throws:

SQLException

ClassNotFoundException

hasClassConditions

public boolean hasClassConditions(ClassMapping base,
                                  boolean subclasses)

Description copied from interface: DiscriminatorStrategy

Whether any class conditions are necessary.

Specified by:

hasClassConditions in interface DiscriminatorStrategy

Overrides:

hasClassConditions in class AbstractDiscriminatorStrategy

See Also:

DiscriminatorStrategy.getClassConditions(org.apache.openjpa.jdbc.sql.Select, org.apache.openjpa.jdbc.sql.Joins, org.apache.openjpa.jdbc.meta.ClassMapping, boolean)

getClassConditions

public SQLBuffer getClassConditions(Select sel,
                                    Joins joins,
                                    ClassMapping base,
                                    boolean subclasses)

Description copied from interface: DiscriminatorStrategy

Return SQL to limit the classes selected as much as possible to the given base class, and optionally its subclasses. The select and joins instances are supplied in order to get column aliases.

Specified by:

getClassConditions in interface DiscriminatorStrategy

Overrides:

getClassConditions in class AbstractDiscriminatorStrategy