Module org.datanucleus.store.rdbms

Package org.datanucleus.store.rdbms.mapping.java

Class MultiMapping

java.lang.Object

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

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

Fields

Modifier and Type	Field	Description
protected JavaTypeMapping[]	javaTypeMappings	The Java mappings represented by this mapping.
protected int	numberOfColumnMappings	Number of column mappings - for convenience to improve performance

Fields inherited from class org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

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

Constructor Summary

Constructors

Constructor	Description
MultiMapping()

Method Summary

Modifier and Type	Method	Description
void	addJavaTypeMapping(JavaTypeMapping mapping)	Method to add a Java type mapping for a field
ColumnMapping	getColumnMapping(int index)	Accessor for a datastore mapping.
ColumnMapping[]	getColumnMappings()	Accessor for the column mappings for this java type
JavaTypeMapping[]	getJavaTypeMapping()	Accessor for the Java type mappings
int	getNumberOfColumnMappings()	Accessor for the number of datastore mappings.

Methods inherited from class org.datanucleus.store.rdbms.mapping.java.JavaTypeMapping

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

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.

numberOfColumnMappings

protected int numberOfColumnMappings

Number of column 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

getNumberOfColumnMappings

public int getNumberOfColumnMappings()

Accessor for the number of datastore mappings.

Overrides:

getNumberOfColumnMappings in class JavaTypeMapping

Returns:

The number of datastore mappings.

getColumnMappings

public ColumnMapping[] getColumnMappings()

Description copied from class: JavaTypeMapping

Accessor for the column mappings for this java type

Overrides:

getColumnMappings in class JavaTypeMapping

Returns:

The column mapping(s)

getColumnMapping

public ColumnMapping getColumnMapping(int index)

Accessor for a datastore mapping.

Overrides:

getColumnMapping in class JavaTypeMapping

Parameters:

index - The position of the mapping to return

Returns:

The datastore mapping