当前页面: 在线文档首页 > Hibernate 2.1.8 正式版 API 英文文档

PersistentCollectionType (Hibernate API Documentation) - Hibernate 2.1.8 正式版 API 英文文档

Overview  Package   Class  Use  Tree  Deprecated  Index  Help
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

net.sf.hibernate.type
Class PersistentCollectionType

java.lang.Object
  net.sf.hibernate.type.AbstractType
      net.sf.hibernate.type.PersistentCollectionType

All Implemented Interfaces:

AssociationType, Serializable, Type

Direct Known Subclasses:

ArrayType, BagType, IdentifierBagType, ListType, MapType, SetType

---

public abstract class PersistentCollectionType

extends AbstractType

implements AssociationType

A type that handles Hibernate PersistentCollections (including arrays).

Author:

Gavin King

See Also:

Serialized Form

---

Constructor Summary

PersistentCollectionType(String role)

 

Method Summary
Object	assemble(Serializable cached, SessionImplementor session, Object owner)           Reconstruct the object from its cached "disassembled" state.
Object	copy(Object original, Object target, SessionImplementor session, Object owner, Map copiedAlready)
Object	deepCopy(Object value)           Return a deep copy of the persistent state, stopping at entities and at collections.
Serializable	disassemble(Object value, SessionImplementor session)           Return a cacheable "disassembled" representation of the object.
boolean	equals(Object object)
boolean	equals(Object x, Object y)           Compare two instances of the class mapped by this type for persistence "equality", ie.
Object	fromString(String xml)           Parse the XML representation of an instance.
Class	getAssociatedClass(SessionFactoryImplementor factory)
int	getColumnSpan(Mapping session)           How many columns are used to persist this type.
Iterator	getElementsIterator(Object collection)
protected  Type	getElementType(SessionFactoryImplementor factory)
ForeignKeyDirection	getForeignKeyDirection()           Get the foreign key directionality of this association
Joinable	getJoinable(SessionFactoryImplementor factory)           Get the "persister" for this association - a class or collection persister
String	getName()           Returns the abbreviated name of the type.
String[]	getReferencedColumns(SessionFactoryImplementor factory)           Get the columns referenced by this association.
String	getRole()
int	hashCode()
boolean	hasNiceEquals()           Does this type implement a well-behaved equals() method.
Object	hydrate(ResultSet rs, String[] name, SessionImplementor session, Object owner)           Retrieve an instance of the mapped class, or the identifier of an entity or collection, from a JDBC resultset.
abstract  PersistentCollection	instantiate(SessionImplementor session, CollectionPersister persister)
boolean	isArrayType()
boolean	isAssociationType()           Note: return true because this type is castable to AssociationType.
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	isModified(Object old, Object current, SessionImplementor session)           Has the parent object been modified, compared to the current database state?
boolean	isMutable()           Are objects of this type mutable.
boolean	isPersistentCollectionType()           Is this type a collection type.
Object	nullSafeGet(ResultSet rs, String[] name, 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, SessionImplementor session)           Write an instance of the mapped class to a prepared statement.
Object	resolveIdentifier(Object value, SessionImplementor session, Object owner)           Map identifiers to entities or collections.
int[]	sqlTypes(Mapping session)           Return the SQL type codes for the columns mapped by this type.
String	toString()
String	toString(Object value, SessionFactoryImplementor factory)           A representation of the value to be embedded in an XML element.
boolean	usePrimaryKeyAsForeignKey()           Is the foreign key the primary key of the table?
abstract  PersistentCollection	wrap(SessionImplementor session, Object collection)

 

Methods inherited from class net.sf.hibernate.type.AbstractType

isComponentType, isEntityType, isObjectType

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Methods inherited from interface net.sf.hibernate.type.Type

getReturnedClass, isComponentType, isEntityType, isObjectType

 

Constructor Detail

PersistentCollectionType

public PersistentCollectionType(String role)

Method Detail

getRole

public String getRole()

---

isPersistentCollectionType

public boolean isPersistentCollectionType()

Description copied from interface: Type

Is this type a collection type.

Specified by:

isPersistentCollectionType in interface Type

Overrides:

isPersistentCollectionType in class AbstractType

---

equals

public final boolean equals(Object x,
                            Object y)

Description copied from interface: Type

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

Specified by:

equals in interface Type

Parameters:

x -

y -

Returns:

boolean

---

instantiate

public abstract PersistentCollection instantiate(SessionImplementor session,
                                                 CollectionPersister persister)
                                          throws HibernateException

Throws:

HibernateException

---

nullSafeGet

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

Description copied from interface: Type

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

Parameters:

rs -

name - the column name

session -

owner - the parent entity

Returns:

Object

Throws:

SQLException

HibernateException

---

nullSafeGet

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

Description copied from interface: Type

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

Specified by:

nullSafeGet in interface Type

Parameters:

rs -

name - the column names

session -

owner - the parent entity

Returns:

Object

Throws:

HibernateException

SQLException

See Also:

alternative, 2-phase property initialization

---

nullSafeSet

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

Description copied from interface: Type

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.

Specified by:

nullSafeSet in interface Type

Parameters:

st -

value - the object to write

index - statement parameter index

session -

Throws:

SQLException

HibernateException

---

sqlTypes

public int[] sqlTypes(Mapping session)
               throws MappingException

Description copied from interface: Type

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

Specified by:

sqlTypes in interface Type

Returns:

the typecodes

Throws:

MappingException

See Also:

Types

---

getColumnSpan

public int getColumnSpan(Mapping session)
                  throws MappingException

Description copied from interface: Type

How many columns are used to persist this type.

Specified by:

getColumnSpan in interface Type

Throws:

MappingException

---

toString

public String toString(Object value,
                       SessionFactoryImplementor factory)
                throws HibernateException

Description copied from interface: Type

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

Specified by:

toString in interface Type

Parameters:

value -

factory -

Returns:

String

Throws:

HibernateException

---

fromString

public Object fromString(String xml)

Description copied from interface: Type

Parse the XML representation of an instance.

Specified by:

fromString in interface Type

Parameters:

xml -

Returns:

an instance of the type

---

deepCopy

public Object deepCopy(Object value)
                throws HibernateException

Description copied from interface: Type

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

Throws:

HibernateException

---

getName

public String getName()

Description copied from interface: Type

Returns the abbreviated name of the type.

Specified by:

getName in interface Type

Returns:

String the Hibernate type name

---

getElementsIterator

public Iterator getElementsIterator(Object collection)

---

isMutable

public boolean isMutable()

Description copied from interface: Type

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

---

disassemble

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

Description copied from interface: Type

Return a cacheable "disassembled" representation of the object.

Specified by:

disassemble in interface Type

Overrides:

disassemble in class AbstractType

Throws:

HibernateException

---

assemble

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

Description copied from interface: Type

Reconstruct the object from its cached "disassembled" state.

Specified by:

assemble in interface Type

Overrides:

assemble in class AbstractType

Throws:

HibernateException

---

isDirty

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

Description copied from interface: Type

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

Specified by:

isDirty in interface Type

Overrides:

isDirty in class AbstractType

Throws:

HibernateException

---

hasNiceEquals

public boolean hasNiceEquals()

Description copied from interface: Type

Does this type implement a well-behaved equals() method. (ie. one that is consistent with Type.equals().) Strictly, if this method returns true then x.equals(y) implies Type.equals(x, y) and also Type.equals(x, y) implies that probably x.equals(y)

Specified by:

hasNiceEquals in interface Type

See Also:

Object.equals(java.lang.Object), Type.equals(java.lang.Object, java.lang.Object)

---

wrap

public abstract PersistentCollection wrap(SessionImplementor session,
                                          Object collection)

---

isAssociationType

public boolean isAssociationType()

Note: return true because this type is castable to AssociationType. Not because all collections are associations.

Specified by:

isAssociationType in interface Type

Overrides:

isAssociationType in class AbstractType

---

getForeignKeyDirection

public ForeignKeyDirection getForeignKeyDirection()

Description copied from interface: AssociationType

Get the foreign key directionality of this association

Specified by:

getForeignKeyDirection in interface AssociationType

---

hydrate

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

Description copied from interface: Type

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().

Specified by:

hydrate in interface Type

Overrides:

hydrate in class AbstractType

Throws:

HibernateException

SQLException

---

resolveIdentifier

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

Description copied from interface: Type

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

Specified by:

resolveIdentifier in interface Type

Overrides:

resolveIdentifier in class AbstractType

Throws:

HibernateException

---

isArrayType

public boolean isArrayType()

---

usePrimaryKeyAsForeignKey

public boolean usePrimaryKeyAsForeignKey()

Description copied from interface: AssociationType

Is the foreign key the primary key of the table?

Specified by:

usePrimaryKeyAsForeignKey in interface AssociationType

---

getJoinable

public Joinable getJoinable(SessionFactoryImplementor factory)
                     throws MappingException

Description copied from interface: AssociationType

Get the "persister" for this association - a class or collection persister

Specified by:

getJoinable in interface AssociationType

Throws:

MappingException

---

getReferencedColumns

public String[] getReferencedColumns(SessionFactoryImplementor factory)
                              throws MappingException

Description copied from interface: AssociationType

Get the columns referenced by this association.

Specified by:

getReferencedColumns in interface AssociationType

Throws:

MappingException

---

isModified

public boolean isModified(Object old,
                          Object current,
                          SessionImplementor session)
                   throws HibernateException

Description copied from interface: Type

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

Specified by:

isModified in interface Type

Overrides:

isModified in class AbstractType

Throws:

HibernateException

---

getAssociatedClass

public Class getAssociatedClass(SessionFactoryImplementor factory)
                         throws MappingException

Specified by:

getAssociatedClass in interface AssociationType

Throws:

MappingException

---

equals

public boolean equals(Object object)

Overrides:

equals in class AbstractType

---

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractType

---

copy

public Object copy(Object original,
                   Object target,
                   SessionImplementor session,
                   Object owner,
                   Map copiedAlready)
            throws HibernateException

Specified by:

copy in interface Type

Overrides:

copy in class AbstractType

Throws:

HibernateException

---

getElementType

protected final Type getElementType(SessionFactoryImplementor factory)
                             throws MappingException

Throws:

MappingException

---

toString

public String toString()

---

Overview  Package   Class  Use  Tree  Deprecated  Index  Help
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---