org.datanucleus.store.mapped.mapping
Class SubclassPCMapping

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

public class SubclassPCMapping
extends MultiMapping

Mapping for a field that stores a PC object that uses "subclass-table" inheritance and where this is mapped in the datastore as a separate FK for each subclass.

Field Summary

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

SubclassPCMapping()

Method Summary

java.lang.Class	getJavaType() Accessor for the java type being mapped.
java.lang.Object	getSampleValue(ClassLoaderResolver clr) Return a sample value of the mapping type to be used for internal evaluation of type/conversion.
void	initialize(AbstractMemberMetaData fmd, DatastoreContainerObject container, ClassLoaderResolver clr) Initialize this JavaTypeMapping with the given DatastoreAdapter for the given FieldMetaData.
ScalarExpression	newLiteral(QueryExpression qs, java.lang.Object value) Creates a literal from an value for use in TJDO-style JDOQL.
ScalarExpression	newScalarExpression(QueryExpression qs, LogicSetExpression te) Creates a expression from a field name/table.
protected void	prepareDatastoreMapping(ClassLoaderResolver clr) Convenience method to create a column for each implementation type of this reference.

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

addJavaTypeMapping, getDatastoreMapping, getDatastoreMappings, getJavaTypeMapping, getMappingNumberForValue, getNumberOfDatastoreMappings, getObject, setObject, setObject

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

addDatastoreMapping, equals, failureMessage, getBoolean, getByte, getChar, getColumnMetaDataForMember, getDatastoreContainer, getDouble, getFloat, getInt, getJavaTypeForDatastoreMapping, 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

SubclassPCMapping

public SubclassPCMapping()

Method Detail

initialize

public void initialize(AbstractMemberMetaData fmd,
                       DatastoreContainerObject container,
                       ClassLoaderResolver clr)

Initialize this JavaTypeMapping with the given DatastoreAdapter for the given FieldMetaData.

Overrides:

initialize in class JavaTypeMapping

Parameters:

container - The datastore container storing this mapping (if any)

clr - the ClassLoaderResolver

fmd - FieldMetaData for the field to be mapped (if any)

prepareDatastoreMapping

protected void prepareDatastoreMapping(ClassLoaderResolver clr)

Convenience method to create a column for each implementation type of this reference.

Parameters:

clr - The ClassLoaderResolver

getJavaType

public java.lang.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

Specified by:

getJavaType in class JavaTypeMapping

Returns:

The java type

getSampleValue

public java.lang.Object getSampleValue(ClassLoaderResolver clr)

Description copied from class: JavaTypeMapping

Return a sample value of the mapping type to be used for internal evaluation of type/conversion. TODO Delete when we drop legacy support

Overrides:

getSampleValue in class JavaTypeMapping

Parameters:

clr - ClassLoader resolver

Returns:

The sample value.

newLiteral

public ScalarExpression newLiteral(QueryExpression qs,
                                   java.lang.Object value)

Description copied from class: JavaTypeMapping

Creates a literal from an value for use in TJDO-style JDOQL. This implementation just throws a NucleusException.

Overrides:

newLiteral in class JavaTypeMapping

Parameters:

qs - The Query statement

value - The object

Returns:

A Scalar Expression TODO Remove this when we drop legacy query mechanism

newScalarExpression

public ScalarExpression newScalarExpression(QueryExpression qs,
                                            LogicSetExpression te)

Description copied from class: JavaTypeMapping

Creates a expression from a field name/table. e.g. tablename.fieldname; tablealias.fieldalias For use in TJDO-style JDOQL. This implementation just throws a NucleusException.

Overrides:

newScalarExpression in class JavaTypeMapping

Parameters:

qs - The Query statement

te - the alias for the table

Returns:

A Scalar Expression TODO Remove this when we drop legacy query mechanism