org.datanucleus.store.mapped.mapping
Class MultiMapping

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

Direct Known Subclasses:

MultiPersistableMapping, PersistableMapping

public abstract class MultiMapping
extends JavaTypeMapping

Mapping to represent multiple mappings within the single overall java type mapping. This mapping can be used to represent, for example,

• a persistable field (where there are multiple PK fields).
• a reference field (where there are multiple implementations - of Object or interface)
• an element in a collection and the element has no table of its own, but multiple subclasses
• a FK of a PC field (where there may be multiple fields in the PK of the PC object)

Field Summary

protected JavaTypeMapping[]	javaTypeMappings The Java mappings represented by this mapping.
protected int	numberOfDatastoreMappings Number of datastore mappings - for convenience to improve performance

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

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

Constructor Summary

MultiMapping()

Method Summary

void	addJavaTypeMapping(JavaTypeMapping mapping) Method to add a Java type mapping for a field
DatastoreMapping	getDatastoreMapping(int index) Accessor for a datastore mapping.
DatastoreMapping[]	getDatastoreMappings() Accessor for the datastore mappings for this java type
JavaTypeMapping[]	getJavaTypeMapping() Accessor for the Java type mappings
int	getNumberOfDatastoreMappings() Accessor for the number of datastore mappings.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

javaTypeMappings

protected JavaTypeMapping[] javaTypeMappings

The Java mappings represented by this mapping.

numberOfDatastoreMappings

protected int numberOfDatastoreMappings

Number of datastore mappings - for convenience to improve performance

Constructor Detail

MultiMapping

public MultiMapping()

Method Detail

addJavaTypeMapping

public void addJavaTypeMapping(JavaTypeMapping mapping)

Method to add a Java type mapping for a field

Parameters:

mapping - The mapping to add

getJavaTypeMapping

public JavaTypeMapping[] getJavaTypeMapping()

Accessor for the Java type mappings

Returns:

The Java type mappings

getNumberOfDatastoreMappings

public int getNumberOfDatastoreMappings()

Accessor for the number of datastore mappings.

Overrides:

getNumberOfDatastoreMappings in class JavaTypeMapping

Returns:

The number of datastore mappings.

getDatastoreMappings

public DatastoreMapping[] getDatastoreMappings()

Description copied from class: JavaTypeMapping

Accessor for the datastore mappings for this java type

Overrides:

getDatastoreMappings in class JavaTypeMapping

Returns:

The datastore mapping(s)

getDatastoreMapping

public DatastoreMapping getDatastoreMapping(int index)

Accessor for a datastore mapping.

Overrides:

getDatastoreMapping in class JavaTypeMapping

Parameters:

index - The position of the mapping to return

Returns:

The datastore mapping