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AppFuse DAO backend implemented with Hibernate (http://hibernate.org).

There is a newer version: 3.5.0

package org.appfuse.dao;

import java.io.Serializable;
import java.util.List;
import java.util.Map;


/**
 * Generic DAO (Data Access Object) with common methods to CRUD POJOs.
 *
 * Extend this interface if you want typesafe (no casting necessary) DAO's for your
 * domain objects.
 *
 * @author Bryan Noll
 * @param  a type variable
 * @param  the primary key for that type
 */
public interface GenericDao  {

    /**
     * Generic method used to get all objects of a particular type. This
     * is the same as lookup up all rows in a table.
     * @return List of populated objects
     */
    List getAll();

    /**
     * Gets all records without duplicates.
     * 
Note that if you use this method, it is imperative that your model
     * classes correctly implement the hashcode/equals methods
     * @return List of populated objects
     */
    List getAllDistinct();

    /**
     * Generic method to get an object based on class and identifier. An
     * ObjectRetrievalFailureException Runtime Exception is thrown if
     * nothing is found.
     *
     * @param id the identifier (primary key) of the object to get
     * @return a populated object
     * @see org.springframework.orm.ObjectRetrievalFailureException
     */
    T get(PK id);

    /**
     * Checks for existence of an object of type T using the id arg.
     * @param id the id of the entity
     * @return - true if it exists, false if it doesn't
     */
    boolean exists(PK id);

    /**
     * Generic method to save an object - handles both update and insert.
     * @param object the object to save
     * @return the persisted object
     */
    T save(T object);

    /**
     * Generic method to delete an object based on class and id
     * @param id the identifier (primary key) of the object to remove
     */
    void remove(PK id);

    /**
     * Find a list of records by using a named query
     * @param queryName query name of the named query
     * @param queryParams a map of the query names and the values
     * @return a list of the records found
     */
    List findByNamedQuery(String queryName, Map queryParams);
}