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


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56 package org.objectstyle.cayenne.map;
57
58 /**
59  * Defines constants for the possible values of ObjRelationship delete rules.
60  *
61  * @author Craig Miskell
62  */
63 public class DeleteRule {
64     public static final int NO_ACTION = 0;
65     private static final String JavaDoc NO_ACTION_NAME = "No Action";
66     
67     /**
68      * Remove the reference that the destination has to this source (if the
69      * inverse relationship is toOne, nullify, if toMany, remove the source
70      * object)
71      */
72     public static final int NULLIFY = 1;
73     private static final String JavaDoc NULLIFY_NAME = "Nullify";
74
75     /** Delete the destination object(s)
76      */
77     public static final int CASCADE = 2;
78     private static final String JavaDoc CASCADE_NAME = "Cascade";
79
80     /** If the relationship has any objects (toOne or toMany), deny the delete.
81      * (Destination objects would therefore have to be deleted manually first)
82      */
83     public static final int DENY = 3;
84     private static final String JavaDoc DENY_NAME = "Deny";
85
86     /**
87      * Returns String label for a delete rule state. Used for save/load (xml),
88      * display in modeler etc. Must remain the same, or else great care taken
89      * with loading old maps.
90      */
91     public static String JavaDoc deleteRuleName(int deleteRule) {
92         switch (deleteRule) {
93             case DeleteRule.NULLIFY :
94                 return NULLIFY_NAME;
95             case DeleteRule.CASCADE :
96                 return CASCADE_NAME;
97             case DeleteRule.DENY :
98                 return DENY_NAME;
99             default :
100                 return NO_ACTION_NAME;
101         }
102     }
103
104     /**
105      * Translates a possible delete rule name (typically returned from
106      * deleteRuleName at some stage), into a deleteRule constant
107      */
108     public static int deleteRuleForName(String JavaDoc name) {
109         if (DENY_NAME.equals(name)) {
110             return DENY;
111         } else if (CASCADE_NAME.equals(name)) {
112             return CASCADE;
113         } else if (NULLIFY_NAME.equals(name)) {
114             return NULLIFY;
115         }
116         return NO_ACTION;
117     }
118
119 }
120
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