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Java > Open Source Codes > org > apache > cayenne > map > DeleteRule


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19
20 package org.apache.cayenne.map;
21
22 /**
23  * Defines constants for the possible values of ObjRelationship delete rules.
24  *
25  * @author Craig Miskell
26  */
27 public class DeleteRule {
28     public static final int NO_ACTION = 0;
29     private static final String JavaDoc NO_ACTION_NAME = "No Action";
30     
31     /**
32      * Remove the reference that the destination has to this source (if the
33      * inverse relationship is toOne, nullify, if toMany, remove the source
34      * object)
35      */
36     public static final int NULLIFY = 1;
37     private static final String JavaDoc NULLIFY_NAME = "Nullify";
38
39     /** Delete the destination object(s)
40      */
41     public static final int CASCADE = 2;
42     private static final String JavaDoc CASCADE_NAME = "Cascade";
43
44     /** If the relationship has any objects (toOne or toMany), deny the delete.
45      * (Destination objects would therefore have to be deleted manually first)
46      */
47     public static final int DENY = 3;
48     private static final String JavaDoc DENY_NAME = "Deny";
49
50     /**
51      * Returns String label for a delete rule state. Used for save/load (xml),
52      * display in modeler etc. Must remain the same, or else great care taken
53      * with loading old maps.
54      */
55     public static String JavaDoc deleteRuleName(int deleteRule) {
56         switch (deleteRule) {
57             case DeleteRule.NULLIFY :
58                 return NULLIFY_NAME;
59             case DeleteRule.CASCADE :
60                 return CASCADE_NAME;
61             case DeleteRule.DENY :
62                 return DENY_NAME;
63             default :
64                 return NO_ACTION_NAME;
65         }
66     }
67
68     /**
69      * Translates a possible delete rule name (typically returned from
70      * deleteRuleName at some stage), into a deleteRule constant
71      */
72     public static int deleteRuleForName(String JavaDoc name) {
73         if (DENY_NAME.equals(name)) {
74             return DENY;
75         } else if (CASCADE_NAME.equals(name)) {
76             return CASCADE;
77         } else if (NULLIFY_NAME.equals(name)) {
78             return NULLIFY;
79         }
80         return NO_ACTION;
81     }
82
83 }
84
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