package org.springframework.samples.petclinic.util;
import java.util.Collection;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.samples.petclinic.BaseEntity;
/**
* Utility methods for handling entities. Separate from the BaseEntity class
* mainly because of dependency on the ORM-associated
* ObjectRetrievalFailureException.
*
* @author Juergen Hoeller
* @author Sam Brannen
* @since 29.10.2003
* @see org.springframework.samples.petclinic.BaseEntity
*/
public abstract class EntityUtils {
/**
* Look up the entity of the given class with the given id in the given
* collection.
*
* @param entities the collection to search
* @param entityClass the entity class to look up
* @param entityId the entity id to look up
* @return the found entity
* @throws ObjectRetrievalFailureException if the entity was not found
*/
public static <T extends BaseEntity> T getById(Collection<T> entities, Class<T> entityClass, int entityId)
throws ObjectRetrievalFailureException {
for (T entity : entities) {
if (entity.getId().intValue() == entityId && entityClass.isInstance(entity)) {
return entity;
}
}
throw new ObjectRetrievalFailureException(entityClass, new Integer(entityId));
}
}