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Java > Open Source Codes > com > jcorporate > expresso > core > dbobj > LookupInterface


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64
65 package com.jcorporate.expresso.core.dbobj;
66
67 import java.util.Vector JavaDoc;
68
69
70 /**
71  * Anything that implements the lookup interface must provide a return vector
72  * of valid values that when called provide a key that maps one to one to
73  * a particular value. For example, using this in UserInfo type classes, it
74  * provides a way to map user id integers to username strings.
75  *
76  * @author Michael Rimov
77  * @since Expresso 4.0
78  */
79 public interface LookupInterface {
80
81     /**
82      * Method to return a Vector of ValidValue
83      * This method may be implemented by objects that want to provide a
84      * list of valid values for other DB objects. It is strongly recommended
85      * that the valid value list be cached (via the CacheManager) for performance.
86      * The naming convention used in Expresso is to store the ValidValue list with
87      * a cache name the same as the db objects class name with ".validValues" appended
88      *
89      * @return A ValidValue vector describing what can be looked up.
90      * @todo This should be converted to array List versions
91      */
92     public Vector JavaDoc getValues()
93             throws com.jcorporate.expresso.core.db.DBException;
94
95 }
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