org.nuiton.topia.persistence.util
Class EntityListUpdator<P extends TopiaEntity,E extends TopiaEntity>

java.lang.Object
  org.nuiton.topia.persistence.util.EntityListUpdator<P,E>

Type Parameters:

P - type of parent of childs

E - type of child

All Implemented Interfaces:

ListUpdator<P,E>

public class EntityListUpdator<P extends TopiaEntity,E extends TopiaEntity>
extends Object
implements ListUpdator<P,E>

A implementation of ListUpdator for TopiaEntity type.

Some factory methods are defined to simplify the generic cast, prefer used them instead of the (protected) constructor.

Author:

tchemit

Field Summary

protected Method	addMethod
protected PropertyDescriptor	descriptor descriptor of the filed containing the childs
protected Method	emptyMethod
protected Method	getMethod
protected String	propertyName name of the field containing the childs
protected Method	removeAllMethod
protected Method	removeMethod
protected Method	sizeMethod

Constructor Summary

protected

EntityListUpdator(Class<P> parentClass, Class<E> childClass, String propertyName)

Method Summary

void	addToList(P parent, E bean) Add a erntity to his parent
E	getChild(P parent, String topiaId) Obtain a child from the entity given his id.
Collection<E>	getChilds(P parent) Obtain the collection of childs from the entity.
String	getPropertyName() Obtain the name of the property containing childs.
protected static void	invoke(Method m, Object bean, Object... args)
protected static <V> V	invokeWithResult(Method m, Object bean, Object... args)
boolean	isEmpty(P parent) Tests if the given entity has some childs.
static <P extends TopiaEntity,E extends TopiaEntity> EntityListUpdator<P,E>	newEntityListUpdator(Class<P> parentClass, Class<E> childClass, String propertyName)
void	removeAll(P parent) Remove all childs of the given parent.
void	removeFromList(P parent, E bean) Remove from a prent entity a given child.
void	setChilds(P parent, Collection<E> childs) Set the childs of an entity
int	size(P parent) Obtain the number of childs for the given parent.

Methods inherited from class java.lang.Object

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

Field Detail

propertyName

protected String propertyName

name of the field containing the childs

descriptor

protected PropertyDescriptor descriptor

descriptor of the filed containing the childs

getMethod

protected Method getMethod

addMethod

protected Method addMethod

removeMethod

protected Method removeMethod

removeAllMethod

protected Method removeAllMethod

sizeMethod

protected Method sizeMethod

emptyMethod

protected Method emptyMethod

Constructor Detail

EntityListUpdator

protected EntityListUpdator(Class<P> parentClass,
                            Class<E> childClass,
                            String propertyName)

Method Detail

newEntityListUpdator

public static <P extends TopiaEntity,E extends TopiaEntity> EntityListUpdator<P,E> newEntityListUpdator(Class<P> parentClass,
                                                                                                        Class<E> childClass,
                                                                                                        String propertyName)

getPropertyName

public String getPropertyName()

Description copied from interface: ListUpdator

Obtain the name of the property containing childs.

Specified by:

getPropertyName in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Returns:

the name of the property containing childs.

getChild

public E getChild(P parent,
                  String topiaId)

Description copied from interface: ListUpdator

Obtain a child from the entity given his id.

Specified by:

getChild in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to query

topiaId - the id of the researched child entity.

Returns:

the child entity or null, if not found.

getChilds

public Collection<E> getChilds(P parent)

Description copied from interface: ListUpdator

Obtain the collection of childs from the entity.

Specified by:

getChilds in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to query.

Returns:

the collection of childs

size

public int size(P parent)

Description copied from interface: ListUpdator

Obtain the number of childs for the given parent.

Specified by:

size in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to query

Returns:

the number of childs for the given entity

isEmpty

public boolean isEmpty(P parent)

Description copied from interface: ListUpdator

Tests if the given entity has some childs.

Specified by:

isEmpty in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to query

Returns:

true is the given parent has no child.

setChilds

public void setChilds(P parent,
                      Collection<E> childs)

Description copied from interface: ListUpdator

Set the childs of an entity

Specified by:

setChilds in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to be setted

childs - the collection of childs to set.

addToList

public void addToList(P parent,
                      E bean)
               throws TopiaException

Description copied from interface: ListUpdator

Add a erntity to his parent

Specified by:

addToList in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to modifiy

bean - the entity to add in parent.

Throws:

TopiaException - if any db problem while operation

removeFromList

public void removeFromList(P parent,
                           E bean)
                    throws TopiaException

Description copied from interface: ListUpdator

Remove from a prent entity a given child.

Specified by:

removeFromList in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to modifiy

bean - the child to remove.

Throws:

TopiaException - if any pb while operation.

removeAll

public void removeAll(P parent)

Description copied from interface: ListUpdator

Remove all childs of the given parent.

Specified by:

removeAll in interface ListUpdator<P extends TopiaEntity,E extends TopiaEntity>

Parameters:

parent - the entity to modify

invoke

protected static void invoke(Method m,
                             Object bean,
                             Object... args)

invokeWithResult

protected static <V> V invokeWithResult(Method m,
                                        Object bean,
                                        Object... args)