package org.jboss.errai.jpa.client.local;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;
import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import javax.persistence.PostRemove;
import javax.persistence.PostUpdate;
import javax.persistence.PrePersist;
import javax.persistence.PreRemove;
import javax.persistence.PreUpdate;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.IdentifiableType;
import javax.persistence.metamodel.SingularAttribute;
import javax.persistence.metamodel.Type;
import com.google.gwt.json.client.JSONValue;
/**
* Errai implementation of the JPA IdentifiableType metamodel interface. Specializes
* ManagedType by adding properties related to ID and version attributes.
*
* @author Jonathan Fuerth <jfuerth@redhat.com>
*
* @param <X> The actual type described by this metatype.
*/
public abstract class ErraiIdentifiableType<X> extends ErraiManagedType<X> implements IdentifiableType<X> {
private SingularAttribute<? super X, ?> id;
private SingularAttribute<? super X, ?> version;
public ErraiIdentifiableType(Class<X> javaType) {
super(javaType);
}
/**
* Delivers the {@link PrePersist} event to the pre-persist listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PrePersist event to.
*/
public abstract void deliverPrePersist(X targetEntity);
/**
* Delivers the {@link PostPersist} event to the post-persist listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PostPersist event to.
*/
public abstract void deliverPostPersist(X targetEntity);
/**
* Delivers the {@link PreUpdate} event to the pre-Update listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PreUpdate event to.
*/
public abstract void deliverPreUpdate(X targetEntity);
/**
* Delivers the {@link PostUpdate} event to the post-Update listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PostUpdate event to.
*/
public abstract void deliverPostUpdate(X targetEntity);
/**
* Delivers the {@link PreRemove} event to the pre-Remove listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PreRemove event to.
*/
public abstract void deliverPreRemove(X targetEntity);
/**
* Delivers the {@link PostRemove} event to the post-Remove listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PostRemove event to.
*/
public abstract void deliverPostRemove(X targetEntity);
/**
* Delivers the {@link PostLoad} event to the post-load listeners on the given
* instance of this entity.
*
* @param targetEntity
* The entity instance to deliver the PostLoad event to.
*/
public abstract <Y> void deliverPostLoad(X targetEntity);
/**
* Converts the given JSONValue, which represents an instance of this entity
* type, into the actual instance of this entity type that exists in the given
* EntityManager's persistence context. References to other entities are
* recursively retrieved from the EntityManager.
*
* @param em
* The EntityManager that owns this entity type and houses the
* persistence context.
* @param jsonValue
* A value that represents an instance of this entity type.
* @return A managed entity that is in the given EntityManager's persistence
* context.
*/
@Override
public X fromJson(EntityManager em, JSONValue jsonValue) {
final ErraiEntityManager eem = (ErraiEntityManager) em;
Key<X, ?> key = keyFromJson(jsonValue);
X entity = eem.getPartiallyConstructedEntity(key);
if (entity != null) {
return entity;
}
entity = newInstance();
try {
eem.putPartiallyConstructedEntity(key, entity);
for (Attribute<? super X, ?> a : getAttributes()) {
ErraiAttribute<? super X, ?> attr = (ErraiAttribute<? super X, ?>) a;
JSONValue attrJsonValue = jsonValue.isObject().get(attr.getName());
// this attribute did not exist when the entity was originally persisted; skip it.
if (attrJsonValue == null) continue;
switch (attr.getPersistentAttributeType()) {
case ELEMENT_COLLECTION:
case EMBEDDED:
case BASIC:
parseInlineJson(entity, attr, attrJsonValue, eem);
break;
case MANY_TO_MANY:
case MANY_TO_ONE:
case ONE_TO_MANY:
case ONE_TO_ONE:
if (attr instanceof ErraiSingularAttribute) {
parseSingularJsonReference(entity, (ErraiSingularAttribute<? super X, ?>) attr, attrJsonValue, eem);
}
else if (attr instanceof ErraiPluralAttribute) {
parsePluralJsonReference(entity, (ErraiPluralAttribute<? super X, ?, ?>) attr, attrJsonValue.isArray(), eem);
}
else {
throw new PersistenceException("Unknown attribute type " + attr);
}
}
}
return entity;
} finally {
eem.removePartiallyConstructedEntity(key);
}
}
private Key<X, ?> keyFromJson(JSONValue json) {
JSONValue keyJson = json.isObject().get(id.getName());
Object idValue = JsonUtil.basicValueFromJson(keyJson, id.getJavaType());
return new Key<X, Object>(this, idValue);
}
@Override
public <Y> void addAttribute(Attribute<X, Y> attribute) {
if (attribute instanceof SingularAttribute) {
SingularAttribute<? super X, ?> sa = (SingularAttribute<? super X, ?>) attribute;
if (sa.isId()) id = sa;
if (sa.isVersion()) version = sa;
}
super.addAttribute(attribute);
}
// ---------- JPA API Below This Line -------------
@SuppressWarnings("unchecked")
@Override
public <Y> ErraiSingularAttribute<? super X, Y> getId(Class<Y> type) {
return (ErraiSingularAttribute<? super X, Y>) id;
}
@SuppressWarnings("unchecked")
@Override
public <Y> SingularAttribute<X, Y> getDeclaredId(Class<Y> type) {
// XXX the JPA spec is not clear on the difference between id and declaredId
return (SingularAttribute<X, Y>) id;
}
@SuppressWarnings("unchecked")
@Override
public <Y> SingularAttribute<? super X, Y> getVersion(Class<Y> type) {
return (SingularAttribute<? super X, Y>) version;
}
@SuppressWarnings("unchecked")
@Override
public <Y> SingularAttribute<X, Y> getDeclaredVersion(Class<Y> type) {
// XXX the JPA spec is not clear on the difference between version and declaredVersion
return (SingularAttribute<X, Y>) version;
}
@Override
public IdentifiableType<? super X> getSupertype() {
throw new RuntimeException("Not implemented");
}
@Override
public boolean hasSingleIdAttribute() {
return id != null;
}
@Override
public boolean hasVersionAttribute() {
return version != null;
}
@Override
public Set<SingularAttribute<? super X, ?>> getIdClassAttributes() {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public Type<?> getIdType() {
return id.getType();
}
@Override
public javax.persistence.metamodel.Type.PersistenceType getPersistenceType() {
return PersistenceType.ENTITY;
}
@Override
public String toString() {
return "[IdentifiableType " + getJavaType().getName() + "]";
}
}