org.hibernate.type
Class EntityType

java.lang.Object
  org.hibernate.type.AbstractType
      org.hibernate.type.EntityType

All Implemented Interfaces:

Serializable, AssociationType, Type

Direct Known Subclasses:

ManyToOneType, OneToOneType

public abstract class EntityType
extends AbstractType
implements AssociationType

Base for types which map associations to persistent entities.

Author:

Gavin King

See Also:

Serialized Form

Field Summary

protected boolean	isEmbeddedInXML
protected String	uniqueKeyPropertyName

Constructor Summary

protected

EntityType(String entityName, String uniqueKeyPropertyName, boolean eager, boolean isEmbeddedInXML, boolean unwrapProxy) Constructs the requested entity type mapping.

Method Summary

int	compare(Object x, Object y, EntityMode entityMode) compare two instances of the type
Object	deepCopy(Object value, EntityMode entityMode, SessionFactoryImplementor factory) Return a deep copy of the persistent state, stopping at entities and at collections.
Object	fromXMLNode(org.dom4j.Node xml, Mapping factory) Parse the XML representation of an instance.
String	getAssociatedEntityName() The name of the associated entity.
String	getAssociatedEntityName(SessionFactoryImplementor factory) The name of the associated entity.
Joinable	getAssociatedJoinable(SessionFactoryImplementor factory) Retrieves the Joinable defining the associated entity.
int	getHashCode(Object x, EntityMode entityMode, SessionFactoryImplementor factory) Get a hashcode, consistent with persistence "equality"
protected Object	getIdentifier(Object value, SessionImplementor session)
String	getIdentifierOrUniqueKeyPropertyName(Mapping factory) The name of the property on the associated entity to which our FK refers
Type	getIdentifierOrUniqueKeyType(Mapping factory) Determine the type of either (1) the identifier if we reference the associated entity's PK or (2) the unique key to which we refer (i.e.
String	getLHSPropertyName() Get the name of a property in the owning entity that provides the join key (null if the identifier)
String	getName() For entity types, the name correlates to the associated entity name.
String	getOnCondition(String alias, SessionFactoryImplementor factory, Map enabledFilters) Get the "filtering" SQL fragment that is applied in the SQL on clause, in addition to the usual join condition
String	getPropertyName()
Class	getReturnedClass() This returns the wrong class for an entity with a proxy, or for a named entity.
String	getRHSUniqueKeyPropertyName() The name of a unique property of the associated entity that provides the join key (null if the identifier of an entity, or key of a collection)
Type	getSemiResolvedType(SessionFactoryImplementor factory) Get the type of a semi-resolved value.
boolean	isAssociationType() An entity type is a type of association type
boolean	isEmbeddedInXML()
boolean	isEntityType() Explicitly, an entity type is an entity type ;)
boolean	isEqual(Object x, Object y, EntityMode entityMode, SessionFactoryImplementor factory) Compare two instances of the class mapped by this type for persistence "equality" - equality of persistent state.
boolean	isMutable() Are objects of this type mutable.
protected boolean	isNotEmbedded(SessionImplementor session)
protected boolean	isNull(Object owner, SessionImplementor session)
protected abstract boolean	isNullable()
abstract boolean	isOneToOne()
boolean	isReferenceToPrimaryKey() Does this association foreign key reference the primary key of the other table? Otherwise, it references a property-ref.
boolean	isSame(Object x, Object y, EntityMode entityMode) Two entities are considered the same when their instances are the same.
boolean	isXMLElement()
Object	loadByUniqueKey(String entityName, String uniqueKeyPropertyName, Object key, SessionImplementor session) Load an instance by a unique key that is not the primary key.
Object	nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner) Retrieve an instance of the mapped class from a JDBC resultset.
Object	nullSafeGet(ResultSet rs, String name, SessionImplementor session, Object owner) Retrieve an instance of the mapped class from a JDBC resultset.
Object	replace(Object original, Object target, SessionImplementor session, Object owner, Map copyCache) During merge, replace the existing (target) value in the entity we are merging to with a new (original) value from the detached entity we are merging.
Object	resolve(Object value, SessionImplementor session, Object owner) Resolve an identifier or unique key value
protected Object	resolveIdentifier(Serializable id, SessionImplementor session) Resolve an identifier via a load.
void	setToXMLNode(org.dom4j.Node node, Object value, SessionFactoryImplementor factory) A representation of the value to be embedded in an XML element.
String	toLoggableString(Object value, SessionFactoryImplementor factory) Generate a loggable representation of an instance of the value mapped by this type.
String	toString() Generates a string representation of this type.

Methods inherited from class org.hibernate.type.AbstractType

assemble, beforeAssemble, disassemble, getHashCode, hydrate, isAnyType, isCollectionType, isComponentType, isDirty, isEqual, isModified, replace, replaceNode, semiResolve

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hibernate.type.AssociationType

getForeignKeyDirection, isAlwaysDirtyChecked, useLHSPrimaryKey

Methods inherited from interface org.hibernate.type.Type

assemble, beforeAssemble, disassemble, getColumnSpan, getHashCode, hydrate, isAnyType, isCollectionType, isComponentType, isDirty, isDirty, isEqual, isModified, nullSafeSet, nullSafeSet, replace, semiResolve, sqlTypes, toColumnNullness

Field Detail

uniqueKeyPropertyName

protected final String uniqueKeyPropertyName

isEmbeddedInXML

protected final boolean isEmbeddedInXML

Constructor Detail

EntityType

protected EntityType(String entityName,
                     String uniqueKeyPropertyName,
                     boolean eager,
                     boolean isEmbeddedInXML,
                     boolean unwrapProxy)

Constructs the requested entity type mapping.

Parameters:

entityName - The name of the associated entity.

uniqueKeyPropertyName - The property-ref name, or null if we reference the PK of the associated entity.

eager - Is eager fetching enabled.

isEmbeddedInXML - Should values of this mapping be embedded in XML modes?

unwrapProxy - Is unwrapping of proxies allowed for this association; unwrapping says to return the "implementation target" of lazy prooxies; typically only possible with lazy="no-proxy".

Method Detail

isAssociationType

public boolean isAssociationType()

An entity type is a type of association type

Specified by:

isAssociationType in interface Type

Overrides:

isAssociationType in class AbstractType

Returns:

True.

See Also:

AssociationType

isEntityType

public final boolean isEntityType()

Explicitly, an entity type is an entity type ;)

Specified by:

isEntityType in interface Type

Overrides:

isEntityType in class AbstractType

Returns:

True.

isMutable

public boolean isMutable()

Are objects of this type mutable. (With respect to the referencing object ... entities and collections are considered immutable because they manage their own internal state.)

Specified by:

isMutable in interface Type

Returns:

boolean

toString

public String toString()

Generates a string representation of this type.

Overrides:

toString in class Object

Returns:

string rep

getName

public String getName()

For entity types, the name correlates to the associated entity name.

Specified by:

getName in interface Type

Returns:

String the Hibernate type name

isReferenceToPrimaryKey

public boolean isReferenceToPrimaryKey()

Does this association foreign key reference the primary key of the other table? Otherwise, it references a property-ref.

Returns:

True if this association reference the PK of the associated entity.

getRHSUniqueKeyPropertyName

public String getRHSUniqueKeyPropertyName()

Description copied from interface: AssociationType

The name of a unique property of the associated entity that provides the join key (null if the identifier of an entity, or key of a collection)

Specified by:

getRHSUniqueKeyPropertyName in interface AssociationType

getLHSPropertyName

public String getLHSPropertyName()

Description copied from interface: AssociationType

Get the name of a property in the owning entity that provides the join key (null if the identifier)

Specified by:

getLHSPropertyName in interface AssociationType

getPropertyName

public String getPropertyName()

getAssociatedEntityName

public final String getAssociatedEntityName()

The name of the associated entity.

Returns:

The associated entity name.

getAssociatedEntityName

public String getAssociatedEntityName(SessionFactoryImplementor factory)

The name of the associated entity.

Specified by:

getAssociatedEntityName in interface AssociationType

Parameters:

factory - The session factory, for resolution.

Returns:

The associated entity name.

getAssociatedJoinable

public Joinable getAssociatedJoinable(SessionFactoryImplementor factory)
                               throws MappingException

Retrieves the Joinable defining the associated entity.

Specified by:

getAssociatedJoinable in interface AssociationType

Parameters:

factory - The session factory.

Returns:

The associated joinable

Throws:

MappingException - Generally indicates an invalid entity name.

getReturnedClass

public final Class getReturnedClass()

This returns the wrong class for an entity with a proxy, or for a named entity. Theoretically it should return the proxy class, but it doesn't.

The problem here is that we do not necessarily have a ref to the associated entity persister (nor to the session factory, to look it up) which is really needed to "do the right thing" here...

Specified by:

getReturnedClass in interface Type

Returns:

The entiyt class.

nullSafeGet

public Object nullSafeGet(ResultSet rs,
                          String name,
                          SessionImplementor session,
                          Object owner)
                   throws HibernateException,
                          SQLException

Retrieve an instance of the mapped class from a JDBC resultset. Implementations should handle possibility of null values. This method might be called if the type is known to be a single-column type.

Specified by:

nullSafeGet in interface Type

name - the column name

owner - the parent entity

Returns:

Object

Throws:

HibernateException

SQLException

nullSafeGet

public final Object nullSafeGet(ResultSet rs,
                                String[] names,
                                SessionImplementor session,
                                Object owner)
                         throws HibernateException,
                                SQLException

Retrieve an instance of the mapped class from a JDBC resultset. Implementors should handle possibility of null values.

Specified by:

nullSafeGet in interface Type

names - the column names

owner - the parent entity

Returns:

Object

Throws:

HibernateException

SQLException

See Also:

alternative, 2-phase property initialization

isSame

public final boolean isSame(Object x,
                            Object y,
                            EntityMode entityMode)

Two entities are considered the same when their instances are the same.

Specified by:

isSame in interface Type

Overrides:

isSame in class AbstractType

Parameters:

x - One entity instance

y - Another entity instance

entityMode - The entity mode.

Returns:

True if x == y; false otherwise.

compare

public int compare(Object x,
                   Object y,
                   EntityMode entityMode)

compare two instances of the type

Specified by:

compare in interface Type

Overrides:

compare in class AbstractType

deepCopy

public Object deepCopy(Object value,
                       EntityMode entityMode,
                       SessionFactoryImplementor factory)

Return a deep copy of the persistent state, stopping at entities and at collections.

Specified by:

deepCopy in interface Type

Parameters:

value - generally a collection element or entity field

Returns:

Object a copy

replace

public Object replace(Object original,
                      Object target,
                      SessionImplementor session,
                      Object owner,
                      Map copyCache)
               throws HibernateException

During merge, replace the existing (target) value in the entity we are merging to with a new (original) value from the detached entity we are merging. For immutable objects, or null values, it is safe to simply return the first parameter. For mutable objects, it is safe to return a copy of the first parameter. For objects with component values, it might make sense to recursively replace component values.

Specified by:

replace in interface Type

Parameters:

original - the value from the detached entity being merged

target - the value in the managed entity

Returns:

the value to be merged

Throws:

HibernateException

getHashCode

public int getHashCode(Object x,
                       EntityMode entityMode,
                       SessionFactoryImplementor factory)

Get a hashcode, consistent with persistence "equality"

Specified by:

getHashCode in interface Type

Overrides:

getHashCode in class AbstractType

isEqual

public boolean isEqual(Object x,
                       Object y,
                       EntityMode entityMode,
                       SessionFactoryImplementor factory)

Compare two instances of the class mapped by this type for persistence "equality" - equality of persistent state.

Specified by:

isEqual in interface Type

Overrides:

isEqual in class AbstractType

Returns:

boolean

isEmbeddedInXML

public boolean isEmbeddedInXML()

Specified by:

isEmbeddedInXML in interface AssociationType

isXMLElement

public boolean isXMLElement()

Specified by:

isXMLElement in interface Type

Overrides:

isXMLElement in class AbstractType

fromXMLNode

public Object fromXMLNode(org.dom4j.Node xml,
                          Mapping factory)
                   throws HibernateException

Parse the XML representation of an instance.

Specified by:

fromXMLNode in interface Type

Returns:

an instance of the type

Throws:

HibernateException

setToXMLNode

public void setToXMLNode(org.dom4j.Node node,
                         Object value,
                         SessionFactoryImplementor factory)
                  throws HibernateException

A representation of the value to be embedded in an XML element.

Specified by:

setToXMLNode in interface Type

Throws:

HibernateException

getOnCondition

public String getOnCondition(String alias,
                             SessionFactoryImplementor factory,
                             Map enabledFilters)
                      throws MappingException

Description copied from interface: AssociationType

Get the "filtering" SQL fragment that is applied in the SQL on clause, in addition to the usual join condition

Specified by:

getOnCondition in interface AssociationType

Throws:

MappingException

resolve

public Object resolve(Object value,
                      SessionImplementor session,
                      Object owner)
               throws HibernateException

Resolve an identifier or unique key value

Specified by:

resolve in interface Type

Overrides:

resolve in class AbstractType

Parameters:

value - an identifier or value returned by hydrate()

session - the session

owner - the parent entity

Returns:

the given value, or the value associated with the identifier

Throws:

HibernateException

See Also:

Type.hydrate(ResultSet, String[], SessionImplementor, Object)

getSemiResolvedType

public Type getSemiResolvedType(SessionFactoryImplementor factory)

Description copied from interface: Type

Get the type of a semi-resolved value.

Specified by:

getSemiResolvedType in interface Type

Overrides:

getSemiResolvedType in class AbstractType

getIdentifier

protected final Object getIdentifier(Object value,
                                     SessionImplementor session)
                              throws HibernateException

Throws:

HibernateException

isNotEmbedded

protected boolean isNotEmbedded(SessionImplementor session)

toLoggableString

public String toLoggableString(Object value,
                               SessionFactoryImplementor factory)

Generate a loggable representation of an instance of the value mapped by this type.

Specified by:

toLoggableString in interface Type

Parameters:

value - The instance to be logged.

factory - The session factory.

Returns:

The loggable string.

Throws:

HibernateException - Generally some form of resolution problem.

isOneToOne

public abstract boolean isOneToOne()

getIdentifierOrUniqueKeyType

public final Type getIdentifierOrUniqueKeyType(Mapping factory)
                                        throws MappingException

Determine the type of either (1) the identifier if we reference the associated entity's PK or (2) the unique key to which we refer (i.e. the property-ref).

Parameters:

factory - The mappings...

Returns:

The appropriate type.

Throws:

MappingException - Generally, if unable to resolve the associated entity name or unique key property name.

getIdentifierOrUniqueKeyPropertyName

public final String getIdentifierOrUniqueKeyPropertyName(Mapping factory)
                                                  throws MappingException

The name of the property on the associated entity to which our FK refers

Parameters:

factory - The mappings...

Returns:

The appropriate property name.

Throws:

MappingException - Generally, if unable to resolve the associated entity name

isNullable

protected abstract boolean isNullable()

resolveIdentifier

protected final Object resolveIdentifier(Serializable id,
                                         SessionImplementor session)
                                  throws HibernateException

Resolve an identifier via a load.

Parameters:

id - The entity id to resolve

session - The orginating session.

Returns:

The resolved identifier (i.e., loaded entity).

Throws:

HibernateException - Indicates problems performing the load.

isNull

protected boolean isNull(Object owner,
                         SessionImplementor session)

loadByUniqueKey

public Object loadByUniqueKey(String entityName,
                              String uniqueKeyPropertyName,
                              Object key,
                              SessionImplementor session)
                       throws HibernateException

Load an instance by a unique key that is not the primary key.

Parameters:

entityName - The name of the entity to load

uniqueKeyPropertyName - The name of the property defining the uniqie key.

key - The unique key property value.

session - The originating session.

Returns:

The loaded entity

Throws:

HibernateException - generally indicates problems performing the load.