org.datanucleus.store.mapped.mapping
Class ObjectMapping

java.lang.Object
  org.datanucleus.store.mapped.mapping.JavaTypeMapping
      org.datanucleus.store.mapped.mapping.MultiMapping
          org.datanucleus.store.mapped.mapping.ReferenceMapping
              org.datanucleus.store.mapped.mapping.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 org.datanucleus.store.mapped.mapping.ReferenceMapping

ID_MAPPING, LOCALISER_MAPPED, mappingStrategy, PER_IMPLEMENTATION_MAPPING, XCALIA_MAPPING

Fields inherited from class org.datanucleus.store.mapped.mapping.MultiMapping

javaTypeMappings, numberOfDatastoreMappings

Fields inherited from class org.datanucleus.store.mapped.mapping.JavaTypeMapping

datastoreContainer, datastoreMappings, LOCALISER, mmd, referenceMapping, roleForMember, storeMgr, type

Constructor Summary

ObjectMapping()

Method Summary

java.lang.Class	getJavaType() Accessor for the Java type being represented.
java.lang.String	getJavaTypeForDatastoreMapping(int index) Accessor for the name of the java-type actually used when mapping the particular datastore field.
java.lang.Object	getSampleValue(ClassLoaderResolver clr) Accessor for a sample value for this Java type

Methods inherited from class org.datanucleus.store.mapped.mapping.ReferenceMapping

getMappingNumberForValue, getMappingStrategy, getObject, getObjectForReferenceString, getReferenceStringForObject, initialize, insertPostProcessing, newLiteral, newScalarExpression, postFetch, postInsert, postUpdate, preDelete, prepareDatastoreMapping, setObject

Methods inherited from class org.datanucleus.store.mapped.mapping.MultiMapping

addJavaTypeMapping, getDatastoreMapping, getDatastoreMappings, getJavaTypeMapping, getNumberOfDatastoreMappings, setObject

Methods inherited from class org.datanucleus.store.mapped.mapping.JavaTypeMapping

addDatastoreMapping, equals, failureMessage, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDatastoreContainer, getDouble, getFloat, getInt, getLong, getMemberMetaData, getObject, getReferenceMapping, getRoleForMember, getShort, getString, getType, getValueForDatastoreMapping, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, setBoolean, setByte, setChar, setDatastoreContainer, setDefault, setDouble, setFloat, setInt, setLong, setMemberMetaData, setReferenceMapping, setRoleForMember, setShort, setString

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectMapping

public ObjectMapping()

Method Detail

getJavaType

public java.lang.Class getJavaType()

Accessor for the Java type being represented.

Overrides:

getJavaType in class ReferenceMapping

Returns:

java.lang.Object

getJavaTypeForDatastoreMapping

public java.lang.String getJavaTypeForDatastoreMapping(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:

getJavaTypeForDatastoreMapping in class ReferenceMapping

Parameters:

index - requested datastore field index.

Returns:

the name of java-type for the requested datastore field.

getSampleValue

public java.lang.Object getSampleValue(ClassLoaderResolver clr)

Accessor for a sample value for this Java type

Overrides:

getSampleValue in class ReferenceMapping

Parameters:

clr - ClassLoader resolver

Returns:

The sample value