com.xpert.persistence.utils

Class EntityUtils

java.lang.Object

com.xpert.persistence.utils.EntityUtils

public class EntityUtils
extends Object

Utility class to manipulae JPA entities

Author:

Ayslan

Constructor Summary

Constructors

Constructor and Description
EntityUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static String	getEntityTableName(Class entity, boolean nameWithSchema) Returns a entity table name.
static Object	getId(Object object) Method to return entity id (field/method with annotation @Id or
static Object	getId(Object object, Class clazz) Method to return entity id (field/method with annotation @Id or
static AccessibleObject	getIdAccessibleObject(Class clazz) Return field/method with annotation @Id/@EmbeddedId from a entity class.
static String	getIdFieldName(Class clazz) Return the name of @Id/@EmbeddedId field/method from entity
static String	getIdFieldName(Object object) Return the name of @Id/@EmbeddedId field/method from entity
static Object	getIdFromString(String id, Class entityClass) Convert a string to a mapped id type.
static Class	getIdType(Class clazz) Return the type of @Id/@EmbeddedId from entity.
static String	getLowerFirstLetter(String string)
static List<Class>	getMappedEntities(javax.persistence.EntityManager entityManager) Return mapped entities in EntityManager.
static Class	getPersistentClass(Object object) Return a class from object id object is null then return null, if object instance of HibernateProxy then return getHibernateLazyInitializer().getPersistentClass()
static boolean	hasAutoGeneratedId(Class clazz) Return true is @GeneratedValue is present in id
static boolean	hasEmbeddedId(Class clazz) Return true if @EmbeddedId is present in id
static boolean	isEntity(Class clazz) Returns true if the class has the annotation @Entity
static boolean	isPersisted(Object object) Returns true if entity has a not null @Id/ @EmbeddedId

Methods inherited from class java.lang.Object

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

Constructor Detail

EntityUtils

public EntityUtils()

Method Detail

getIdFromString

public static Object getIdFromString(String id,
                     Class entityClass)

Convert a string to a mapped id type. Example:

 
 @Id
 private Integer id;
 
 

With string "10" returns a Integer value 10

Parameters:

id -

entityClass -

Returns:

getEntityTableName

public static String getEntityTableName(Class entity,
                        boolean nameWithSchema)

Returns a entity table name. Try to get from @Table annotation, if not exsits try to get @Entity, if not exists return class.getSimpleName()

Parameters:

entity -

nameWithSchema - Indicate if name comes with schema. Example: yourShema.tableName

Returns:

getMappedEntities

public static List<Class> getMappedEntities(javax.persistence.EntityManager entityManager)

Return mapped entities in EntityManager. Classes are get from ClassMetadata in SessionFactory

Parameters:

entityManager -

Returns:

hasAutoGeneratedId

public static boolean hasAutoGeneratedId(Class clazz)

Return true is @GeneratedValue is present in id

Parameters:

clazz -

Returns:

hasEmbeddedId

public static boolean hasEmbeddedId(Class clazz)

Return true if @EmbeddedId is present in id

Parameters:

clazz -

Returns:

getId

public static Object getId(Object object)

Method to return entity id (field/method with annotation @Id or

Parameters:

object -

Returns:

isPersisted

public static boolean isPersisted(Object object)

Returns true if entity has a not null @Id/ @EmbeddedId

Parameters:

object -

Returns:

getId

public static Object getId(Object object,
           Class clazz)

Method to return entity id (field/method with annotation @Id or

Parameters:

object -

clazz - current class

Returns:

getPersistentClass

public static Class getPersistentClass(Object object)

Return a class from object id object is null then return null, if object instance of HibernateProxy then return getHibernateLazyInitializer().getPersistentClass()

Parameters:

object -

Returns:

getIdType

public static Class getIdType(Class clazz)

Return the type of @Id/@EmbeddedId from entity. Example: Integer.class, Long.class

Parameters:

clazz -

Returns:

getIdFieldName

public static String getIdFieldName(Object object)

Return the name of @Id/@EmbeddedId field/method from entity

Parameters:

object -

Returns:

getIdFieldName

public static String getIdFieldName(Class clazz)

Return the name of @Id/@EmbeddedId field/method from entity

Parameters:

clazz -

Returns:

getIdAccessibleObject

public static AccessibleObject getIdAccessibleObject(Class clazz)

Return field/method with annotation @Id/@EmbeddedId from a entity class. AccessibleObject is superclass of Field and Method.

Parameters:

clazz -

Returns:

getLowerFirstLetter

public static String getLowerFirstLetter(String string)

isEntity

public static boolean isEntity(Class clazz)

Returns true if the class has the annotation @Entity

Parameters:

clazz -

Returns: