Module org.datanucleus.store.rdbms

Package org.datanucleus.store.rdbms.discriminator

Class DiscriminatorUtils

java.lang.Object

org.datanucleus.store.rdbms.discriminator.DiscriminatorUtils

public class DiscriminatorUtils
extends Object

Convenience methods for handling discriminators.

Constructor Summary

Constructors

Constructor	Description
DiscriminatorUtils()

Method Summary

Modifier and Type	Method	Description
static Object	getDiscriminatorValueForClass(org.datanucleus.NucleusContext nucleusCtx, String className, org.datanucleus.metadata.DiscriminatorMetaData dismd, JavaTypeMapping discriminatorMapping, org.datanucleus.ClassLoaderResolver clr)	Convenience method to generate a BooleanExpression for the associated discriminator value for the specified class.
static List	getDiscriminatorValuesForMember(String className, JavaTypeMapping discMapping, RDBMSStoreManager storeMgr, org.datanucleus.ClassLoaderResolver clr)	Method to return all possible discriminator values for the supplied class and its subclasses.
static BooleanExpression	getExpressionForDiscriminatorForClass(SQLStatement stmt, String className, org.datanucleus.metadata.DiscriminatorMetaData dismd, JavaTypeMapping discriminatorMapping, SQLTable discrimSqlTbl, org.datanucleus.ClassLoaderResolver clr)	Convenience method to generate a BooleanExpression for the associated discriminator value for the specified class.

Methods inherited from class java.lang.Object

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

Constructor Detail

DiscriminatorUtils

public DiscriminatorUtils()

Method Detail

getExpressionForDiscriminatorForClass

public static BooleanExpression getExpressionForDiscriminatorForClass(SQLStatement stmt,
                                                                      String className,
                                                                      org.datanucleus.metadata.DiscriminatorMetaData dismd,
                                                                      JavaTypeMapping discriminatorMapping,
                                                                      SQLTable discrimSqlTbl,
                                                                      org.datanucleus.ClassLoaderResolver clr)

Convenience method to generate a BooleanExpression for the associated discriminator value for the specified class.

Parameters:

stmt - The Query Statement to be updated

className - The class name

dismd - MetaData for the discriminator

discriminatorMapping - Mapping for the discriminator

discrimSqlTbl - SQLTable for the table with the discriminator

clr - ClassLoader resolver

Returns:

Boolean expression for this discriminator value

getDiscriminatorValueForClass

public static Object getDiscriminatorValueForClass(org.datanucleus.NucleusContext nucleusCtx,
                                                   String className,
                                                   org.datanucleus.metadata.DiscriminatorMetaData dismd,
                                                   JavaTypeMapping discriminatorMapping,
                                                   org.datanucleus.ClassLoaderResolver clr)

Convenience method to generate a BooleanExpression for the associated discriminator value for the specified class.

Parameters:

nucleusCtx - NucleusContext

className - The class name

dismd - MetaData for the discriminator

discriminatorMapping - Mapping for the discriminator

clr - ClassLoader resolver

Returns:

The discriminator value for this class

getDiscriminatorValuesForMember

public static List getDiscriminatorValuesForMember(String className,
                                                   JavaTypeMapping discMapping,
                                                   RDBMSStoreManager storeMgr,
                                                   org.datanucleus.ClassLoaderResolver clr)

Method to return all possible discriminator values for the supplied class and its subclasses.

Parameters:

className - Name of the class

discMapping - The discriminator mapping

storeMgr - StoreManager

clr - ClassLoader resolver

Returns:

The possible discriminator values