com.h3c.util.dao

Class AbstractDao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

java.lang.Object

com.h3c.util.dao.AbstractBaseDao<I,P,T,F,S>

com.h3c.util.dao.AbstractDao<I,P,T,F,S>

Type Parameters:

I - type of the persistent object and transport object id. This type should be immutable. It is critical this type implements equals() and hashCode() correctly.

P - type of model persistent object.

T - type of the transport object.

F - type of the associated filter.

S - type of the associated sort specification type.

All Implemented Interfaces:

Converter<P,T>, BaseDao<I,P,T,F,S>, Dao<I,P,T,F,S>

public abstract class AbstractDao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>
extends AbstractBaseDao<I,P,T,F,S>
implements Dao<I,P,T,F,S>

JPA Abstract Data Access Object.

This class must remain state-less so it is thread safe.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDao(Class<P> entityClass) Construct DAO and initialize query predicate generator.
protected	AbstractDao(Class<P> entityClass, UpdateStrategy<P,T> updateStrategy) Construct DAO and initialize query predicate generator.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract void	conform(P target, T source) Synchronizes the transport object and the persistent object state.
T	convert(P source) Converts an instance of type S to an instance of type T
P	create(T transportable, DataStoreContext context) Creates a new persistent object with the data from the given transport object.
protected abstract P	createStorableInstance(T transportable) Creates the instance of the persistent object (Entity).
long	delete(F filter, DataStoreContext context) Deletes all persistent objects matching the given filter.
boolean	delete(Id<T,I> id, DataStoreContext context) Deletes the persistent object with the given id.
void	delete(P storable, DataStoreContext context) Deletes a persistent object.
long	deleteAll(DataStoreContext context) Deletes all the persistent objects.
protected abstract T	doConvert(P source) Converts the persistent object to a transport object.
P	update(T transportable, DataStoreContext context) Updates the persistent object related to the given transport object.

Methods inherited from class com.h3c.util.dao.AbstractBaseDao

count, find, find, findAll, get, getQueryPredicate, getQueryPredicateGenerator, getSingularAttribute, updateDependents

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.h3c.util.dao.BaseDao

count, find, find, findAll, get

Constructor Detail

AbstractDao

protected AbstractDao(Class<P> entityClass)

Construct DAO and initialize query predicate generator.

Parameters:

entityClass - persistent object class.

AbstractDao

protected AbstractDao(Class<P> entityClass,
           UpdateStrategy<P,T> updateStrategy)

Construct DAO and initialize query predicate generator.

Parameters:

entityClass - persistent object class.

updateStrategy - update strategy.

Method Detail

create

public P create(T transportable,
       DataStoreContext context)

Description copied from interface: Dao

Creates a new persistent object with the data from the given transport object.

Specified by:

create in interface Dao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

Parameters:

transportable - transport object to get the data from

context - data store context

Returns:

the new created persistent object

update

public P update(T transportable,
       DataStoreContext context)

Description copied from interface: Dao

Updates the persistent object related to the given transport object.

Specified by:

update in interface Dao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

Parameters:

transportable - transport object to get the data from

context - data store context

Returns:

the updated persistent object

delete

public void delete(P storable,
          DataStoreContext context)

Description copied from interface: Dao

Deletes a persistent object.

Concrete classes could override this method to do any pre-processing / post-processing work.

Specified by:

delete in interface Dao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

Parameters:

storable - the persistent object to delete

context - data store context

delete

public boolean delete(Id<T,I> id,
             DataStoreContext context)

Description copied from interface: Dao

Deletes the persistent object with the given id.

Specified by:

delete in interface Dao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

Parameters:

id - persistent object's id

context - data store context

Returns:

true if the persistent object was found and deleted, false if it was not found

delete

public long delete(F filter,
          DataStoreContext context)

Description copied from interface: Dao

Deletes all persistent objects matching the given filter.

Specified by:

delete in interface Dao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

Parameters:

filter - filter

context - data store context

Returns:

number of deleted objects

deleteAll

public long deleteAll(DataStoreContext context)

Description copied from interface: Dao

Deletes all the persistent objects.

Specified by:

deleteAll in interface Dao<I extends Serializable,P extends Storable<I>,T extends Transportable<? super T,I>,F,S>

Parameters:

context - data store context

Returns:

the count of entries deleted

convert

public T convert(P source)

Description copied from interface: Converter

Converts an instance of type S to an instance of type T

Specified by:

convert in interface Converter<P extends Storable<I>,T extends Transportable<? super T,I>>

Parameters:

source - the source object to be converted

Returns:

an instance of the target type T converted from the source

createStorableInstance

protected abstract P createStorableInstance(T transportable)

Creates the instance of the persistent object (Entity).

Parameters:

transportable - transport object to get the data from.

Returns:

a new instance of the persistent object.

doConvert

protected abstract T doConvert(P source)

Converts the persistent object to a transport object.

Parameters:

source - persistent object to convert.

Returns:

a transport object with the same data than source

conform

protected abstract void conform(P target,
           T source)

Synchronizes the transport object and the persistent object state. This method is called from update(Transportable, DataStoreContext), thus if update(Transportable, DataStoreContext) is overwritten this method could have an empty implementation.

Parameters:

target - object to update.

source - object to take the data from.