Java > Open Source Codes > org > appfuse > dao > Dao


1   package org.appfuse.dao;
2   
3   import java.io.Serializable  ;
4   import java.util.List  ;
5   
6   
7   /**
8    * Data Access Object (Dao) interface.   This is an interface
9    * used to tag our Dao classes and to provide common methods to all Daos.
10   *
11   * <p><a HREF="Dao.java.htm"><i>View Source</i></a></p>
12   *
13   * @author <a HREF="mailto:matt@raibledesigns.com">Matt Raible</a>
14   */
15  public interface Dao {
16  
17      /**
18       * Generic method used to get all objects of a particular type. This
19       * is the same as lookup up all rows in a table.
20       * @param clazz the type of objects (a.k.a. while table) to get data from
21       * @return List of populated objects
22       */
23      public List   getObjects(Class   clazz);
24      
25      /**
26       * Generic method to get an object based on class and identifier. An 
27       * ObjectRetrievalFailureException Runtime Exception is thrown if 
28       * nothing is found.
29       * 
30       * @param clazz model class to lookup
31       * @param id the identifier (primary key) of the class
32       * @return a populated object
33       * @see org.springframework.orm.ObjectRetrievalFailureException
34       */
35      public Object   getObject(Class   clazz, Serializable   id);
36  
37      /**
38       * Generic method to save an object - handles both update and insert.
39       * @param o the object to save
40       */
41      public void saveObject(Object   o);
42  
43      /**
44       * Generic method to delete an object based on class and id
45       * @param clazz model class to lookup
46       * @param id the identifier (primary key) of the class
47       */
48      public void removeObject(Class   clazz, Serializable   id);
49  }
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