org.datanucleus.enhancer.methods

Class CopyKeyFieldsFromObjectId

java.lang.Object

org.datanucleus.enhancer.ClassMethod

org.datanucleus.enhancer.methods.CopyKeyFieldsFromObjectId

public class CopyKeyFieldsFromObjectId
extends ClassMethod

Method to generate the method "dnCopyKeyFieldsFromObjectId" using ASM. For datastore/nondurable identity this is

 public void dnCopyKeyFieldsFromObjectId(Persistable.ObjectIdFieldConsumer fc, Object oid)
 {
 }
 

and for SingleFieldIdentity it is

 public void dnCopyKeyFieldsFromObjectId(Persistable.ObjectIdFieldConsumer fc, Object oid)
 {
     if (fc == null)
         throw new IllegalArgumentException("ObjectIdFieldConsumer is null");
     if (!(oid instanceof YYYIdentity))
         throw new ClassCastException("oid is not instanceof YYYIdentity");
     YYYIdentity o = (YYYIdentity) oid;
     fc.storeYYYField(1, o.getKey());
 }
 

and for user-defined primary keys

 public void dnCopyKeyFieldsFromObjectId(Persistable.ObjectIdFieldConsumer fc, Object oid)
 {
     if (fc == null)
         throw new IllegalArgumentException("ObjectIdFieldConsumer is null");
     if (!(oid instanceof UserPrimaryKey))
         throw new ClassCastException("oid is not instanceof mydomain.UserPrimaryKey");
     UserPrimaryKey o = (UserPrimaryKey) oid;
     try
     {
         fc.storeYYYField(1, o.id);
         fc.storeZZZField(2, o.name);
     }
     catch(Exception e) {}
 }
 

and for CompoundIdentity

 public void dnCopyKeyFieldsFromObjectId(Persistable.ObjectIdFieldConsumer fc, Object oid)
 {
     if (fc == null)
         throw new IllegalArgumentException("ObjectIdFieldConsumer is null");
     if (!(oid instanceof UserPrimaryKey))
         throw new ClassCastException("oid is not instanceof mydomain.UserPrimaryKey");
     UserPrimaryKey o = (UserPrimaryKey) oid;
     try
     {
         fc.storeYYYField(1, o.id);
         fc.storeZZZField(2, dnGetPersistenceManager().getObjectById(o.zzz, false));
     }
     catch (Exception e) {}
 }
 

(the try-catch is for cases where we set the fields with reflection and it can throw an exception). There are some differences for fields .v. properties and also if fields in the PK are private.

Field Summary

Fields inherited from class org.datanucleus.enhancer.ClassMethod

access, argNames, argTypes, enhancer, exceptions, methodName, returnType, visitor

Constructor Summary

Constructors

Constructor and Description
CopyKeyFieldsFromObjectId(ClassEnhancer enhancer, String name, int access, Object returnType, Object[] argTypes, String[] argNames) Constructor.

Method Summary

Modifier and Type	Method and Description
void	execute() Method to add the contents of the class method.
static CopyKeyFieldsFromObjectId	getInstance(ClassEnhancer enhancer)

Methods inherited from class org.datanucleus.enhancer.ClassMethod

close, equals, getAccess, getClassEnhancer, getDescriptor, getMethodAdditionMessage, getName, getNamer, hashCode, initialise, initialise

Methods inherited from class java.lang.Object

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

Constructor Detail

CopyKeyFieldsFromObjectId

public CopyKeyFieldsFromObjectId(ClassEnhancer enhancer,
                                 String name,
                                 int access,
                                 Object returnType,
                                 Object[] argTypes,
                                 String[] argNames)

Constructor.

Parameters:

enhancer - ClassEnhancer

name - Name of method

access - Access type

returnType - Return type

argTypes - Argument types

argNames - Argument names

Method Detail

getInstance

public static CopyKeyFieldsFromObjectId getInstance(ClassEnhancer enhancer)

execute

public void execute()

Method to add the contents of the class method.

Specified by:

execute in class ClassMethod