Package org.apache.openjpa.enhance

Class PCDataGenerator

java.lang.Object

org.apache.openjpa.enhance.DynamicStorageGenerator

org.apache.openjpa.enhance.PCDataGenerator

Direct Known Subclasses:

DataCachePCDataGenerator

public class PCDataGenerator
extends DynamicStorageGenerator

Generates PCData instances which avoid primitive wrappers to optimize memory use and performance at the cost of slightly higher startup time.

Since:

0.3.2

Author:

Steve Kim, Mark Struberg rework to ASM

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	PCDataGenerator.DynamicPCData	Dynamic PCDatas generated will implement this interface to simplify initialization.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final String	POSTFIX

Fields inherited from class org.apache.openjpa.enhance.DynamicStorageGenerator

POLICY_EMPTY, POLICY_EXCEPTION, POLICY_SILENT

Constructor Summary

Constructors

Constructor	Description
PCDataGenerator(OpenJPAConfiguration conf)

Method Summary

Modifier and Type	Method	Description
protected void	addVersionMethods(ClassNodeTracker bc)	Add methods for loading and storing version data.
protected void	declareClasses(ClassNodeTracker bc)	Add interface or superclass declarations to the generated class.
protected final void	decorate(Object obj, ClassNodeTracker bc, int[] types)	Decorate the generated class.
protected void	decorate(ClassNodeTracker bc, ClassMetaData meta)	Apply additional decoration to generated class.
protected void	finish(PCDataGenerator.DynamicPCData data, ClassMetaData meta)	Perform any final actions before the pcdata is returned to client code.
PCData	generatePCData(Object oid, ClassMetaData meta)	Return a PCData instance for the given oid and metadata.
protected final String	getClassName(Object obj)	Return a class name to use for the given user key.
OpenJPAConfiguration	getConfiguration()	Return the configuration.
protected int	getCreateFieldMethods(int typeCode)	Return the policy constant for how to create type methods.
static Class<?>	getType(String className)
protected String	getUniqueName(Class<?> type)	Creates a unique name for the given type's pcdata implementation.
protected int	replaceType(FieldMetaData fmd)	Return a valid JavaTypes constant for the given field
protected boolean	usesImplData(ClassMetaData meta)	Whether the given type might have cacheable class-level impl data.
protected boolean	usesImplData(FieldMetaData fmd)	Whether the given field might have cacheable impl data.
protected boolean	usesIntermediate(FieldMetaData fmd)	Whether the given field uses a cacheable intermediate value.

Methods inherited from class org.apache.openjpa.enhance.DynamicStorageGenerator

addBeanField, createFactory, forType, generateStorage, getFieldAccess, getFieldName, getWrapper, getWrapper, isCompatible

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

POSTFIX

protected static final String POSTFIX

See Also:

• Constant Field Values

Constructor Details

PCDataGenerator

public PCDataGenerator(OpenJPAConfiguration conf)

Method Details

getConfiguration

public OpenJPAConfiguration getConfiguration()

Return the configuration.

generatePCData

public PCData generatePCData(Object oid,
 ClassMetaData meta)

Return a PCData instance for the given oid and metadata.

finish

protected void finish(PCDataGenerator.DynamicPCData data,
 ClassMetaData meta)

Perform any final actions before the pcdata is returned to client code.

getCreateFieldMethods

protected int getCreateFieldMethods(int typeCode)

Description copied from class: DynamicStorageGenerator

Return the policy constant for how to create type methods.

Overrides:

getCreateFieldMethods in class DynamicStorageGenerator

declareClasses

protected void declareClasses(ClassNodeTracker bc)

Description copied from class: DynamicStorageGenerator

Add interface or superclass declarations to the generated class.

Overrides:

declareClasses in class DynamicStorageGenerator

getClassName

protected final String getClassName(Object obj)

Description copied from class: DynamicStorageGenerator

Return a class name to use for the given user key. By default, returns the stringified key prefixed by PREFIX.

Overrides:

getClassName in class DynamicStorageGenerator

getUniqueName

protected String getUniqueName(Class<?> type)

Creates a unique name for the given type's pcdata implementation.

decorate

protected final void decorate(Object obj,
 ClassNodeTracker bc,
 int[] types)

Description copied from class: DynamicStorageGenerator

Decorate the generated class.

Overrides:

decorate in class DynamicStorageGenerator

decorate

protected void decorate(ClassNodeTracker bc,
 ClassMetaData meta)

Apply additional decoration to generated class.

getType

public static Class<?> getType(String className)

addVersionMethods

protected void addVersionMethods(ClassNodeTracker bc)

Add methods for loading and storing version data.

replaceType

protected int replaceType(FieldMetaData fmd)

Return a valid JavaTypes constant for the given field

usesIntermediate

protected boolean usesIntermediate(FieldMetaData fmd)

Whether the given field uses a cacheable intermediate value.

usesImplData

protected boolean usesImplData(ClassMetaData meta)

Whether the given type might have cacheable class-level impl data.

usesImplData

protected boolean usesImplData(FieldMetaData fmd)

Whether the given field might have cacheable impl data.