java.lang.Object
- com.devonfw.module.jpa.dataaccess.api.QueryHelper
- - com.devonfw.module.jpa.dataaccess.base.AbstractGenericDao<ID,E>

Type Parameters:

ID - is the generic type if the primary key.

E - is the generic type of the managed PersistenceEntity.

All Implemented Interfaces:

FeatureForceIncrementModificationCounter<E>, GenericDao<ID,E>

Direct Known Subclasses:

AbstractDao
```
public abstract class AbstractGenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
extends QueryHelper
implements GenericDao<ID,E>
```
This is the abstract base-implementation of the GenericDao interface.

Field Summary

Fields
Modifier and Type Field Description

private javax.persistence.EntityManager entityManager

private static org.slf4j.Logger LOG
Logger instance.
- Fields inherited from class com.devonfw.module.jpa.dataaccess.api.QueryHelper
  QUERY_PROPERTY_TIMEOUT

Constructor Summary

Constructors
Constructor Description

AbstractGenericDao()
The constructor.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`delete(E entity)`	Deletes a given entity.
`void`	`delete(ID id)`	Deletes the entity with the given id.
`void`	`delete(Iterable<? extends E> entities)`	Deletes the given entities.
`boolean`	`exists(ID id)`	Returns whether an entity with the given id exists.
`E`	`find(ID id)`	Retrieves an entity by its id.
`List<E>`	`findAll()`
`List<E>`	`findAll(Iterable<ID> ids)`	Returns all instances of the type with the given IDs.
`E`	`findOne(ID id)`	Retrieves an entity by its id.
`void`	`forceIncrementModificationCounter(E entity)`
`E`	`get(com.devonfw.module.basic.common.api.reference.Ref<ID,E> reference)`
`protected abstract Class<E>`	`getEntityClass()`
`protected javax.persistence.EntityManager`	`getEntityManager()`
`protected String`	`getEntityName()`
`protected boolean`	`isNew(E entity)`	Determines if the given `PersistenceEntity` is new.
`E`	`save(E entity)`	Saves a given entity.
`void`	`save(Iterable<? extends E> entities)`	Saves all given entities.
`void`	`setEntityManager(javax.persistence.EntityManager entityManager)`
`protected Collection<ID>`	`toCollection(Iterable<ID> ids)`

Methods inherited from class com.devonfw.module.jpa.dataaccess.api.QueryHelper
applySort, applyTimeout, findPaginatedGeneric, newInClause, newLikeClause, newLikeClause, newNotLikeClause, newStringClause, newStringClause, whereIn, whereLike, whereNotLike, whereString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LOG
```
private static final org.slf4j.Logger LOG
```
    Logger instance.
  - entityManager
```
private javax.persistence.EntityManager entityManager
```
- Constructor Detail
  - AbstractGenericDao
```
public AbstractGenericDao()
```
    The constructor.
- Method Detail
  - getEntityClass
```
protected abstract Class<E> getEntityClass()
```
    Returns:
    
    the Class reflecting the managed entity.
  - getEntityManager
```
protected javax.persistence.EntityManager getEntityManager()
```
    Returns:
    
    the EntityManager instance.
  - setEntityManager
```
public void setEntityManager(javax.persistence.EntityManager entityManager)
```
    Parameters:
    
    entityManager - the EntityManager to inject.
  - getEntityName
```
protected String getEntityName()
```
    Returns:
    
    the name of the managed entity.
  - save
```
public E save(E entity)
```
    Description copied from interface: GenericDao
    
    Saves a given entity. Use the returned instance for further operations as the save operation might have changed the entity instance completely.
    
    Specified by:
    
    save in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    entity - the entity to save
    
    Returns:
    
    the saved entity
  - isNew
```
protected boolean isNew(E entity)
```
    Determines if the given PersistenceEntity is new.
    
    Parameters:
    
    entity - is the PersistenceEntity to check.
    
    Returns:
    
    true if new, false otherwise (e.g. managed or detached).
  - save
```
public void save(Iterable<? extends E> entities)
```
    Description copied from interface: GenericDao
    
    Saves all given entities.
    
    Specified by:
    
    save in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    entities - the entities to save
  - forceIncrementModificationCounter
```
public void forceIncrementModificationCounter(E entity)
```
    Specified by:
    
    forceIncrementModificationCounter in interface FeatureForceIncrementModificationCounter<ID>
  - findOne
```
public E findOne(ID id)
```
    Description copied from interface: GenericDao
    
    Retrieves an entity by its id.
    
    Specified by:
    
    findOne in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    id - must not be null.
    
    Returns:
    
    the entity with the given id or null if none found
  - find
```
public E find(ID id)
```
    Description copied from interface: GenericDao
    
    Retrieves an entity by its id.
    
    Specified by:
    
    find in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    id - must not be null.
    
    Returns:
    
    the entity with the given id or null if none found
  - get
```
public E get(com.devonfw.module.basic.common.api.reference.Ref<ID,E> reference)
```
    Specified by:
    
    get in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    reference - the Ref to the PersistenceEntity to get. Typically an instance of IdRef.
    
    Returns:
    
    the PersistenceEntity as reference for the given Ref. Will be null if the given Ref was null.
  - exists
```
public boolean exists(ID id)
```
    Description copied from interface: GenericDao
    
    Returns whether an entity with the given id exists.
    
    Specified by:
    
    exists in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    id - must not be null.
    
    Returns:
    
    true if an entity with the given id exists, false otherwise
  - findAll
```
public List<E> findAll()
```
    Returns:
    
    an Iterable to find ALL managed entities from the persistent store. Not exposed to API by default as this might not make sense for all kind of entities.
  - findAll
```
public List<E> findAll(Iterable<ID> ids)
```
    Description copied from interface: GenericDao
    
    Returns all instances of the type with the given IDs.
    
    Specified by:
    
    findAll in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    ids - are the IDs of all entities to retrieve e.g. as List.
    
    Returns:
    
    an Iterable with all entites for the given ids.
  - toCollection
```
protected Collection<ID> toCollection(Iterable<ID> ids)
```
    Parameters:
    
    ids - sequence of id
    
    Returns:
    
    a collection of these ids to use Expression.in(Collection) for instance
  - delete
```
public void delete(ID id)
```
    Description copied from interface: GenericDao
    
    Deletes the entity with the given id.
    
    Specified by:
    
    delete in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    id - must not be null.
  - delete
```
public void delete(E entity)
```
    Description copied from interface: GenericDao
    
    Deletes a given entity.
    
    Specified by:
    
    delete in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    entity - the entity to delete
  - delete
```
public void delete(Iterable<? extends E> entities)
```
    Description copied from interface: GenericDao
    
    Deletes the given entities.
    
    Specified by:
    
    delete in interface GenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>
    
    Parameters:
    
    entities - the entities to delete

Modifier and Type	Field	Description
`private javax.persistence.EntityManager`	`entityManager`
`private static org.slf4j.Logger`	`LOG`	Logger instance.

Class AbstractGenericDao<ID,​E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>

Field Summary

Fields inherited from class com.devonfw.module.jpa.dataaccess.api.QueryHelper

Constructor Summary

Method Summary

Methods inherited from class com.devonfw.module.jpa.dataaccess.api.QueryHelper

Methods inherited from class java.lang.Object

Field Detail

LOG

entityManager

Constructor Detail

AbstractGenericDao

Method Detail

getEntityClass

getEntityManager

setEntityManager

getEntityName

save

isNew

save

forceIncrementModificationCounter

findOne

find

get

exists

findAll

findAll

toCollection

delete

delete

delete

Class AbstractGenericDao<ID,E extends com.devonfw.module.basic.common.api.entity.PersistenceEntity<ID>>