org.hibernate.type
Interface Type

All Superinterfaces:

Serializable

All Known Subinterfaces:

AbstractComponentType, AssociationType, DiscriminatorType, IdentifierType, VersionType

All Known Implementing Classes:

AbstractBynaryType, AbstractCharArrayType, AbstractType, AdaptedImmutableType, AnyType, ArrayType, BagType, BigDecimalType, BigIntegerType, BinaryType, BlobType, BooleanType, ByteType, CalendarDateType, CalendarType, CharacterArrayType, CharacterType, CharArrayType, CharBooleanType, ClassType, ClobType, CollectionType, ComponentType, CompositeCustomType, CurrencyType, CustomCollectionType, CustomType, DateType, DbTimestampType, DoubleType, EmbeddedComponentType, EntityType, FloatType, IdentifierBagType, ImmutableType, IntegerType, ListType, LocaleType, LongType, ManyToOneType, MapType, MetaType, MutableType, NullableType, OneToOneType, OrderedMapType, OrderedSetType, PrimitiveType, SerializableType, SetType, ShortType, SortedMapType, SortedSetType, SpecialOneToOneType, StringType, TextType, TimestampType, TimeType, TimeZoneType, TrueFalseType, WrapperBinaryType, YesNoType

public interface Type
extends Serializable

Defines a mapping from a Java type to an JDBC datatype. This interface is intended to be implemented by applications that need custom types.

Implementors should usually be immutable and must certainly be threadsafe.

Author:

Gavin King

Method Summary

Object	assemble(Serializable cached, SessionImplementor session, Object owner) Reconstruct the object from its cached "disassembled" state.
void	beforeAssemble(Serializable cached, SessionImplementor session) Called before assembling a query result set from the query cache, to allow batch fetching of entities missing from the second-level cache.
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.
Serializable	disassemble(Object value, SessionImplementor session, Object owner) Return a cacheable "disassembled" representation of the object.
Object	fromXMLNode(org.dom4j.Node xml, Mapping factory) Parse the XML representation of an instance.
int	getColumnSpan(Mapping mapping) How many columns are used to persist this type.
int	getHashCode(Object x, EntityMode entityMode) Get a hashcode, consistent with persistence "equality"
int	getHashCode(Object x, EntityMode entityMode, SessionFactoryImplementor factory) Get a hashcode, consistent with persistence "equality"
String	getName() Returns the abbreviated name of the type.
Class	getReturnedClass() The class returned by nullSafeGet() methods.
Type	getSemiResolvedType(SessionFactoryImplementor factory) Get the type of a semi-resolved value.
Object	hydrate(ResultSet rs, String[] names, SessionImplementor session, Object owner) Retrieve an instance of the mapped class, or the identifier of an entity or collection, from a JDBC resultset.
boolean	isAnyType() Is this an "any" type.
boolean	isAssociationType() Return true if the implementation is castable to AssociationType.
boolean	isCollectionType() Is this type a collection type.
boolean	isComponentType() Is this type a component type.
boolean	isDirty(Object old, Object current, boolean[] checkable, SessionImplementor session) Should the parent be considered dirty, given both the old and current field or element value?
boolean	isDirty(Object old, Object current, SessionImplementor session) Should the parent be considered dirty, given both the old and current field or element value?
boolean	isEntityType() Is this type an entity type?
boolean	isEqual(Object x, Object y, EntityMode entityMode) Compare two instances of the class mapped by this type for persistence "equality" - equality of persistent state.
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	isModified(Object oldHydratedState, Object currentState, boolean[] checkable, SessionImplementor session) Has the parent object been modified, compared to the current database state?
boolean	isMutable() Are objects of this type mutable.
boolean	isSame(Object x, Object y, EntityMode entityMode) Compare two instances of the class mapped by this type for persistence "equality" - equality of persistent state - taking a shortcut for entity references.
boolean	isXMLElement()
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.
void	nullSafeSet(PreparedStatement st, Object value, int index, boolean[] settable, SessionImplementor session) Write an instance of the mapped class to a prepared statement, ignoring some columns.
void	nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session) Write an instance of the mapped class to a prepared statement.
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	replace(Object original, Object target, SessionImplementor session, Object owner, Map copyCache, ForeignKeyDirection foreignKeyDirection) 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) Map identifiers to entities or collections.
Object	semiResolve(Object value, SessionImplementor session, Object owner) Given a hydrated, but unresolved value, return a value that may be used to reconstruct property-ref associations.
void	setToXMLNode(org.dom4j.Node node, Object value, SessionFactoryImplementor factory) A representation of the value to be embedded in an XML element.
int[]	sqlTypes(Mapping mapping) Return the SQL type codes for the columns mapped by this type.
boolean[]	toColumnNullness(Object value, Mapping mapping) Given an instance of the type, return an array of boolean, indicating which mapped columns would be null.
String	toLoggableString(Object value, SessionFactoryImplementor factory) A representation of the value to be embedded in a log file.

Method Detail

isAssociationType

boolean isAssociationType()

Return true if the implementation is castable to AssociationType. This does not necessarily imply that the type actually represents an association.

Returns:

boolean

See Also:

AssociationType

isCollectionType

boolean isCollectionType()

Is this type a collection type.

isComponentType

boolean isComponentType()

Is this type a component type. If so, the implementation must be castable to AbstractComponentType. A component type may own collections or associations and hence must provide certain extra functionality.

Returns:

boolean

See Also:

AbstractComponentType

isEntityType

boolean isEntityType()

Is this type an entity type?

Returns:

boolean

isAnyType

boolean isAnyType()

Is this an "any" type. i.e. a reference to a persistent entity that is not modelled as a (foreign key) association.

isXMLElement

boolean isXMLElement()

sqlTypes

int[] sqlTypes(Mapping mapping)
               throws MappingException

Return the SQL type codes for the columns mapped by this type. The codes are defined on java.sql.Types.

Returns:

the typecodes

Throws:

MappingException

See Also:

Types

getColumnSpan

int getColumnSpan(Mapping mapping)
                  throws MappingException

How many columns are used to persist this type.

Throws:

MappingException

getReturnedClass

Class getReturnedClass()

The class returned by nullSafeGet() methods. This is used to establish the class of an array of this type.

Returns:

Class

isSame

boolean isSame(Object x,
               Object y,
               EntityMode entityMode)
               throws HibernateException

Compare two instances of the class mapped by this type for persistence "equality" - equality of persistent state - taking a shortcut for entity references.

Parameters:

x -

y -

entityMode -

Returns:

boolean

Throws:

HibernateException

isEqual

boolean isEqual(Object x,
                Object y,
                EntityMode entityMode)
                throws HibernateException

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

Parameters:

x -

y -

entityMode -

Returns:

boolean

Throws:

HibernateException

isEqual

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

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

Parameters:

x -

y -

entityMode -

Returns:

boolean

Throws:

HibernateException

getHashCode

int getHashCode(Object x,
                EntityMode entityMode)
                throws HibernateException

Get a hashcode, consistent with persistence "equality"

Parameters:

x -

entityMode -

Throws:

HibernateException

getHashCode

int getHashCode(Object x,
                EntityMode entityMode,
                SessionFactoryImplementor factory)
                throws HibernateException

Get a hashcode, consistent with persistence "equality"

Parameters:

x -

entityMode -

factory -

Throws:

HibernateException

compare

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

compare two instances of the type

Parameters:

entityMode -

isDirty

boolean isDirty(Object old,
                Object current,
                SessionImplementor session)
                throws HibernateException

Should the parent be considered dirty, given both the old and current field or element value?

Parameters:

old - the old value

current - the current value

session -

Returns:

true if the field is dirty

Throws:

HibernateException

isDirty

boolean isDirty(Object old,
                Object current,
                boolean[] checkable,
                SessionImplementor session)
                throws HibernateException

Should the parent be considered dirty, given both the old and current field or element value?

Parameters:

old - the old value

current - the current value

checkable - which columns are actually updatable

session -

Returns:

true if the field is dirty

Throws:

HibernateException

isModified

boolean isModified(Object oldHydratedState,
                   Object currentState,
                   boolean[] checkable,
                   SessionImplementor session)
                   throws HibernateException

Has the parent object been modified, compared to the current database state?

Parameters:

oldHydratedState - the database state, in a "hydrated" form, with identifiers unresolved

currentState - the current state of the object

checkable - which columns are actually updatable

session -

Returns:

true if the field has been modified

Throws:

HibernateException

nullSafeGet

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.

Parameters:

rs -

names - the column names

session -

owner - the parent entity

Returns:

Object

Throws:

HibernateException

SQLException

See Also:

alternative, 2-phase property initialization

nullSafeGet

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.

Parameters:

rs -

name - the column name

session -

owner - the parent entity

Returns:

Object

Throws:

HibernateException

SQLException

nullSafeSet

void nullSafeSet(PreparedStatement st,
                 Object value,
                 int index,
                 boolean[] settable,
                 SessionImplementor session)
                 throws HibernateException,
                        SQLException

Write an instance of the mapped class to a prepared statement, ignoring some columns. Implementors should handle possibility of null values. A multi-column type should be written to parameters starting from index.

Parameters:

st -

value - the object to write

index - statement parameter index

settable - an array indicating which columns to ignore

session -

Throws:

HibernateException

SQLException

nullSafeSet

void nullSafeSet(PreparedStatement st,
                 Object value,
                 int index,
                 SessionImplementor session)
                 throws HibernateException,
                        SQLException

Write an instance of the mapped class to a prepared statement. Implementors should handle possibility of null values. A multi-column type should be written to parameters starting from index.

Parameters:

st -

value - the object to write

index - statement parameter index

session -

Throws:

HibernateException

SQLException

setToXMLNode

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

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

Parameters:

value -

factory -

Throws:

HibernateException

toLoggableString

String toLoggableString(Object value,
                        SessionFactoryImplementor factory)
                        throws HibernateException

A representation of the value to be embedded in a log file.

Parameters:

value -

factory -

Returns:

String

Throws:

HibernateException

fromXMLNode

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

Parse the XML representation of an instance.

Parameters:

xml -

factory -

Returns:

an instance of the type

Throws:

HibernateException

getName

String getName()

Returns the abbreviated name of the type.

Returns:

String the Hibernate type name

deepCopy

Object deepCopy(Object value,
                EntityMode entityMode,
                SessionFactoryImplementor factory)
                throws HibernateException

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

Parameters:

value - generally a collection element or entity field

entityMode -

factory -

Returns:

Object a copy

Throws:

HibernateException

isMutable

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.)

Returns:

boolean

disassemble

Serializable disassemble(Object value,
                         SessionImplementor session,
                         Object owner)
                         throws HibernateException

Return a cacheable "disassembled" representation of the object.

Parameters:

value - the value to cache

session - the session

owner - optional parent entity object (needed for collections)

Returns:

the disassembled, deep cloned state

Throws:

HibernateException

assemble

Object assemble(Serializable cached,
                SessionImplementor session,
                Object owner)
                throws HibernateException

Reconstruct the object from its cached "disassembled" state.

Parameters:

cached - the disassembled state from the cache

session - the session

owner - the parent entity object

Returns:

the the object

Throws:

HibernateException

beforeAssemble

void beforeAssemble(Serializable cached,
                    SessionImplementor session)

Called before assembling a query result set from the query cache, to allow batch fetching of entities missing from the second-level cache.

hydrate

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

Retrieve an instance of the mapped class, or the identifier of an entity or collection, from a JDBC resultset. This is useful for 2-phase property initialization - the second phase is a call to resolveIdentifier().

Parameters:

rs -

names - the column names

session - the session

owner - the parent entity

Returns:

Object an identifier or actual value

Throws:

HibernateException

SQLException

See Also:

resolve(Object, SessionImplementor, Object)

resolve

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

Map identifiers to entities or collections. This is the second phase of 2-phase property initialization.

Parameters:

value - an identifier or value returned by hydrate()

owner - the parent entity

session - the session

Returns:

the given value, or the value associated with the identifier

Throws:

HibernateException

See Also:

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

semiResolve

Object semiResolve(Object value,
                   SessionImplementor session,
                   Object owner)
                   throws HibernateException

Given a hydrated, but unresolved value, return a value that may be used to reconstruct property-ref associations.

Throws:

HibernateException

getSemiResolvedType

Type getSemiResolvedType(SessionFactoryImplementor factory)

Get the type of a semi-resolved value.

replace

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.

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

replace

Object replace(Object original,
               Object target,
               SessionImplementor session,
               Object owner,
               Map copyCache,
               ForeignKeyDirection foreignKeyDirection)
               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.

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

toColumnNullness

boolean[] toColumnNullness(Object value,
                           Mapping mapping)

Given an instance of the type, return an array of boolean, indicating which mapped columns would be null.

Parameters:

value - an instance of the type