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package io.katharsis.jpa.query;

import java.util.List;

public interface JpaQueryFactory {

	/**
	 * Called by the JPA module ones initalized.
	 * 
	 * @param context to access entityManager, meta-data, etc.
	 */
	void initalize(JpaQueryFactoryContext context);

	/**
	 * Builds a new query for the given entity class.
	 * 
	 * @param  entity
	 * @param entityClass to query
	 * @return query
	 */
	 JpaQuery query(Class entityClass);

	/**
	 * Builds a new query for the given attribute. Used to retrieve relations of
	 * an entity.
	 * 
	 * @param  parent entity
	 * @param parentEntityClass to fetch children from
	 * @param childrenAttrName on parent entity
	 * @param parentIds to retrieve the children from
	 * @return query
	 */
	 JpaQuery query(Class parentEntityClass, String childrenAttrName, List parentIds);

	/**
	 * @return ComputedAttributeRegistry holding registered computed attributes
	 */
	ComputedAttributeRegistry getComputedAttributes();

}