org.jpox.store.mapping
Class ObjectMapping

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

public class ObjectMapping
extends ReferenceMapping

Mapping for Object fields. An Object field has a list of possible (PersistenceCapable) types that it represents and so any Object field is mapped to a series of ForeignKey columns in the datastore.

Version:

$Revision: 1.14 $

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

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

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

Method Summary

java.lang.Class	getJavaType() Accessor for the Java type being represented.
java.lang.Object	getSampleValue() Accessor for a sample value for this Java type
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.ReferenceMapping

createColumns

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

ObjectMapping

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

Constructor.

Parameters:

dba - Datastore adapter

type - The type of the (interface) field

ObjectMapping

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

Constructor.

Parameters:

dba - Datastroe adapter

fmd - MetaData for the (interface) field

datastoreContainer - Table where the interface is to be stored

clr - The ClassLoaderResolver

Method Detail

getJavaType

public java.lang.Class getJavaType()

Accessor for the Java type being represented.

Overrides:

getJavaType in class ReferenceMapping

Returns:

java.lang.Object

getSampleValue

public java.lang.Object getSampleValue()

Accessor for a sample value for this Java type

Overrides:

getSampleValue in class ReferenceMapping

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