Class ObjectMapping

java.lang.Object

org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

org.datanucleus.store.rdbms.mapping.java.MultiMapping

org.datanucleus.store.rdbms.mapping.java.MultiPersistableMapping

org.datanucleus.store.rdbms.mapping.java.ReferenceMapping

org.datanucleus.store.rdbms.mapping.java.ObjectMapping

All Implemented Interfaces:

MappingCallbacks

public class ObjectMapping
extends ReferenceMapping

Mapping for Object fields. An Object field can represent two things

1. An object of a series of possible PC types ("implementation-classes") and each implementation type is represented in the datastore by a FK to the PC table
2. An object of a series of possible non-PC types (e.g String, Long, Double etc) and each implementation type is represented in the datastore by a separate column

Field Summary

Fields inherited from class ReferenceMapping

ID_MAPPING, mappingStrategy, PER_IMPLEMENTATION_MAPPING, XCALIA_MAPPING

Fields inherited from class MultiMapping

javaTypeMappings, numberOfColumnMappings

Fields inherited from class JavaTypeMapping

absFieldNumber, columnMappings, mmd, referenceMapping, roleForMember, storeMgr, table, type

Constructor Summary

Constructors

Constructor	Description
ObjectMapping()

Method Summary

Modifier and Type	Method	Description
Class	getJavaType()	Accessor for the java type being mapped.
String	getJavaTypeForColumnMapping(int index)	Accessor for the name of the java-type actually used when mapping the particular datastore field.

Methods inherited from class ReferenceMapping

createPerImplementationColumnsForReferenceField, getJavaTypeMappingForType, getMappingNumberForValue, getMappingStrategy, getObject, getObjectForReferenceString, getReferenceStringForObject, initialize, preDelete, prepareColumnMapping, setObject

Methods inherited from class MultiPersistableMapping

setObject

Methods inherited from class MultiMapping

addJavaTypeMapping, getColumnMapping, getColumnMappings, getJavaTypeMapping, getNumberOfColumnMappings

Methods inherited from class JavaTypeMapping

addColumnMapping, equals, failureMessage, getAbsoluteFieldNumber, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDouble, getFloat, getInt, getLong, getMemberMetaData, getObject, getReferenceMapping, getRoleForMember, getShort, getStoreManager, getString, getTable, getType, getValueForColumnMapping, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, performSetPostProcessing, representableAsStringLiteralInStatement, requiresSetPostProcessing, setAbsFieldNumber, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setMemberMetaData, setReferenceMapping, setRoleForMember, setShort, setString, setTable

Methods inherited from class Object

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

Methods inherited from interface MappingCallbacks

postFetch, postInsert, postUpdate

Constructor Details

ObjectMapping

public ObjectMapping()

Method Details

getJavaType

public Class getJavaType()

Description copied from class: JavaTypeMapping

Accessor for the java type being mapped. This is the java type that the mapping represents. Some examples :

• if the field is of type "MyClass" then the mapping will be OIDMapping (or subclass) the javaType will be OID, and the type will be MyClass.
• if the field is of type "int" then the mapping will be IntegerMapping, the javaType will be Integer, and the type will be int.

The "java type" is the java-type name used in the plugin.xml mapping file

Overrides:

getJavaType in class ReferenceMapping

Returns:

The java type

getJavaTypeForColumnMapping

public String getJavaTypeForColumnMapping(int index)

Accessor for the name of the java-type actually used when mapping the particular datastore field. Returns Serializable since the object needs to be serialisable

Overrides:

getJavaTypeForColumnMapping in class ReferenceMapping

Parameters:

index - requested column index.

Returns:

the name of java-type for the requested column.