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CustomType (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.type
Class CustomType

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

All Implemented Interfaces:

DiscriminatorType, IdentifierType, LiteralType, Serializable, Type, VersionType

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public class CustomType

extends AbstractType

implements IdentifierType, DiscriminatorType, VersionType

Adapts UserType to the generic Type interface, in order to isolate user code from changes in the internal Type contracts.

Author:

Gavin King

See Also:

UserType, Serialized Form

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Constructor Summary

CustomType(Class userTypeClass, Properties parameters)

 

Method Summary
Object	assemble(Serializable cached, SessionImplementor session, Object owner)           Reconstruct the object from its cached "disassembled" state.
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.
Object	fromXMLString(String xml, Mapping factory)
int	getColumnSpan(Mapping session)           How many columns are used to persist this type.
Comparator	getComparator()           Get a comparator for version values.
int	getHashCode(Object x, EntityMode entityMode)           Get a hashcode, consistent with persistence "equality"
String	getName()           Returns the abbreviated name of the type.
Class	getReturnedClass()           The class returned by nullSafeGet() methods.
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	isEqual(Object x, Object y)           Are the two version values considered equal?
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	isMutable()           Are objects of this type mutable.
Object	next(Object current, SessionImplementor session)           Increment the version.
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 columnName, 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.
String	objectToSQLString(Object value, Dialect dialect)           String representation of the value, suitable for embedding in an SQL 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	seed(SessionImplementor session)           Generate an initial version.
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 pi)           Return the SQL type codes for the columns mapped by this type.
Object	stringToObject(String xml)           Convert the value from the mapping file to a Java object.
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.
String	toXMLString(Object value, SessionFactoryImplementor factory)

 

Methods inherited from class org.hibernate.type.AbstractType

beforeAssemble, compare, getHashCode, getSemiResolvedType, hydrate, isAnyType, isAssociationType, isCollectionType, isComponentType, isDirty, isEntityType, isEqual, isModified, isSame, isXMLElement, replace, replaceNode, resolve, semiResolve

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface org.hibernate.type.Type

beforeAssemble, compare, getHashCode, getSemiResolvedType, hydrate, isAnyType, isAssociationType, isCollectionType, isComponentType, isDirty, isEntityType, isEqual, isModified, isSame, isXMLElement, replace, resolve, semiResolve

 

Constructor Detail

CustomType

public CustomType(Class userTypeClass,
                  Properties parameters)
           throws MappingException

Method Detail

sqlTypes

public int[] sqlTypes(Mapping pi)

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

See Also:

Types

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getColumnSpan

public int getColumnSpan(Mapping session)

Description copied from interface: Type

How many columns are used to persist this type.

Specified by:

getColumnSpan in interface Type

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getReturnedClass

public Class getReturnedClass()

Description copied from interface: Type

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

Specified by:

getReturnedClass in interface Type

Returns:

Class

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isEqual

public boolean isEqual(Object x,
                       Object y)
                throws HibernateException

Description copied from interface: VersionType

Are the two version values considered equal?

Specified by:

isEqual in interface VersionType

Parameters:

x - One value to check.

y - The other value to check.

Returns:

true if the values are equal, false otherwise.

Throws:

HibernateException

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isEqual

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

Description copied from interface: Type

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

Throws:

HibernateException

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getHashCode

public int getHashCode(Object x,
                       EntityMode entityMode)

Description copied from interface: Type

Get a hashcode, consistent with persistence "equality"

Specified by:

getHashCode in interface Type

Overrides:

getHashCode in class AbstractType

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nullSafeGet

public Object nullSafeGet(ResultSet rs,
                          String[] names,
                          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 -

names - the column names

session -

owner - the parent entity

Returns:

Object

Throws:

SQLException

HibernateException

See Also:

alternative, 2-phase property initialization

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nullSafeGet

public Object nullSafeGet(ResultSet rs,
                          String columnName,
                          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 -

columnName - the column name

session -

owner - the parent entity

Returns:

Object

Throws:

SQLException

HibernateException

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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

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disassemble

public Serializable disassemble(Object value,
                                SessionImplementor session,
                                Object owner)
                         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

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replace

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

Description copied from interface: Type

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

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nullSafeSet

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

Description copied from interface: Type

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.

Specified by:

nullSafeSet in interface Type

Parameters:

st -

value - the object to write

index - statement parameter index

settable - an array indicating which columns to ignore

session -

Throws:

SQLException

HibernateException

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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

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toXMLString

public String toXMLString(Object value,
                          SessionFactoryImplementor factory)

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fromXMLString

public Object fromXMLString(String xml,
                            Mapping factory)

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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

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deepCopy

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

entityMode -

factory -

Returns:

Object a copy

Throws:

HibernateException

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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

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stringToObject

public Object stringToObject(String xml)

Description copied from interface: IdentifierType

Convert the value from the mapping file to a Java object.

Specified by:

stringToObject in interface IdentifierType

Parameters:

xml - the value of discriminator-value or unsaved-value attribute

Returns:

Object

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objectToSQLString

public String objectToSQLString(Object value,
                                Dialect dialect)
                         throws Exception

Description copied from interface: LiteralType

String representation of the value, suitable for embedding in an SQL statement.

Specified by:

objectToSQLString in interface LiteralType

Parameters:

value -

dialect -

Returns:

String the value, as it appears in a SQL query

Throws:

Exception

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getComparator

public Comparator getComparator()

Description copied from interface: VersionType

Get a comparator for version values.

Specified by:

getComparator in interface VersionType

Returns:

The comparator to use to compare different version values.

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next

public Object next(Object current,
                   SessionImplementor session)

Description copied from interface: VersionType

Increment the version.

Specified by:

next in interface VersionType

Parameters:

session - The session from which this request originates.

current - the current version

Returns:

an instance of the type

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seed

public Object seed(SessionImplementor session)

Description copied from interface: VersionType

Generate an initial version.

Specified by:

seed in interface VersionType

Parameters:

session - The session from which this request originates.

Returns:

an instance of the type

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fromXMLNode

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

Description copied from interface: Type

Parse the XML representation of an instance.

Specified by:

fromXMLNode in interface Type

Parameters:

xml -

factory -

Returns:

an instance of the type

Throws:

HibernateException

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setToXMLNode

public void setToXMLNode(org.dom4j.Node node,
                         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:

setToXMLNode in interface Type

Parameters:

value -

factory -

Returns:

String

Throws:

HibernateException

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toLoggableString

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

Description copied from interface: Type

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

Specified by:

toLoggableString in interface Type

Parameters:

value -

factory -

Returns:

String

Throws:

HibernateException

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toColumnNullness

public boolean[] toColumnNullness(Object value,
                                  Mapping mapping)

Description copied from interface: Type

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

Specified by:

toColumnNullness in interface Type

Parameters:

value - an instance of the type

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isDirty

public boolean isDirty(Object old,
                       Object current,
                       boolean[] checkable,
                       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

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

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