org.jpox.store.mapping
Class SubclassPCMapping

java.lang.Object
  org.jpox.store.mapping.JavaTypeMapping
      org.jpox.store.mapping.MultiMapping
          org.jpox.store.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.

Version:

$Revision: 1.5 $

Field Summary

Fields inherited from class org.jpox.store.mapping.MultiMapping

datastoreContainer, javaTypeMappings

Fields inherited from class org.jpox.store.mapping.JavaTypeMapping

datastoreMappings, dba, fmd, LOCALISER, referenceMapping, type

Constructor Summary

SubclassPCMapping(DatastoreAdapter dba, AbstractPropertyMetaData fmd, DatastoreContainerObject datastoreContainer, ClassLoaderResolver clr)
Constructor.

SubclassPCMapping(DatastoreAdapter dba, java.lang.String type)
Constructor.

Method Summary

protected void	createColumns(DatastoreContainerObject datastoreContainer, AbstractPropertyMetaData fmd, ClassLoaderResolver clr) Convenience method to create a column for each implementation type of this reference.
java.lang.Class	getJavaType() Accessor for the java type being mapped
java.lang.Object	getSampleValue() Return a sample value of the mapping type to be used for internal evaluation of type and conversion.
ScalarExpression	newLiteral(QueryExpression qs, java.lang.Object value) Creates a literal from an value.
ScalarExpression	newScalarExpression(QueryExpression qs, LogicSetExpression te) Creates a expression from a field name/table.

Methods inherited from class org.jpox.store.mapping.MultiMapping

addJavaTypeMapping, getDatastoreContainer, getDataStoreMapping, getJavaTypeMapping, getNumberOfDatastoreFields, getObject, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, setObject, setObject

Methods inherited from class org.jpox.store.mapping.JavaTypeMapping

addDataStoreMapping, failureMessage, getBoolean, getByte, getChar, getDataStoreMappings, getDouble, getFieldMetaData, getFloat, getInt, getLong, getObject, getReferenceMapping, getShort, getString, getType, isNullable, setBoolean, setByte, setChar, setDefault, setDouble, setFloat, setInt, setLong, setReferenceMapping, setShort, setString

Methods inherited from class java.lang.Object

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

Constructor Detail

SubclassPCMapping

public SubclassPCMapping(DatastoreAdapter dba,
                         java.lang.String type)

Constructor.

Parameters:

dba - Datastore adapter

type - The type of the (reference) field

SubclassPCMapping

public SubclassPCMapping(DatastoreAdapter dba,
                         AbstractPropertyMetaData fmd,
                         DatastoreContainerObject datastoreContainer,
                         ClassLoaderResolver clr)

Constructor.

Parameters:

dba - Datastore adapter

fmd - MetaData for the (reference) field

datastoreContainer - Table where the interface is to be stored

clr - The ClassLoaderResolver

Method Detail

createColumns

protected void createColumns(DatastoreContainerObject datastoreContainer,
                             AbstractPropertyMetaData fmd,
                             ClassLoaderResolver clr)

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

Parameters:

datastoreContainer - Table to use

fmd - MetaData for the field

clr - The ClassLoaderResolver

getJavaType

public java.lang.Class getJavaType()

Description copied from class: JavaTypeMapping

Accessor for the java type being mapped

Specified by:

getJavaType in class JavaTypeMapping

Returns:

The java type

getSampleValue

public java.lang.Object getSampleValue()

Description copied from class: JavaTypeMapping

Return a sample value of the mapping type to be used for internal evaluation of type and conversion.

Specified by:

getSampleValue in class JavaTypeMapping

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. A string literal is enclosed in single quotes. for example: "literal". A string literal that includes a single quote is represented by two single quotes. for example: "literal''s". An exact numeric literal is a numeric value without a decimal point, such as 57, -957, +62. An approximate numeric literal is a numeric value in scientific notation, such as 7E3, -57.9E2, or a numeric value with a decimal, such as 7., -95.7, +6.2.

Specified by:

newLiteral in class JavaTypeMapping

Parameters:

qs - The Query statement

value - The object

Returns:

A Scalar Expression

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

Specified by:

newScalarExpression in class JavaTypeMapping

Parameters:

qs - The Query statement

te - the alias for the table

Returns:

A Scalar Expression