package org.springframework.samples.petclinic.util;
import java.util.Collection;
import java.util.Iterator;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.samples.petclinic.Entity;
/**
* Utility methods for handling entities.
* Separate from the Entity class mainly because of dependency
* on the ORM-associated ObjectRetrievalFailureException.
*
* @author Juergen Hoeller
* @since 29.10.2003
* @see org.springframework.samples.petclinic.Entity
*/
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 Entity getById(Collection entities, Class entityClass, int entityId)
throws ObjectRetrievalFailureException {
for (Iterator it = entities.iterator(); it.hasNext();) {
Entity entity = (Entity) it.next();
if (entity.getId().intValue() == entityId && entityClass.isInstance(entity)) {
return entity;
}
}
throw new ObjectRetrievalFailureException(entityClass, new Integer(entityId));
}
}