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17 package org.apache.commons.betwixt.expression;
18
19 import java.util.Collection;
20
21 /***
22 * Updates a Collection by adding the new value to it.
23 * @since 0.8
24 */
25 public class CollectionUpdater implements Updater {
26
27 private static CollectionUpdater INSTANCE;
28
29 /***
30 * Gets singleton instance.
31 * @return <code>CollectionUpdater</code>, not null
32 */
33 public static synchronized CollectionUpdater getInstance() {
34 if (INSTANCE == null) {
35 INSTANCE = new CollectionUpdater();
36 }
37 return INSTANCE;
38 }
39
40 /***
41 * Updates collection contained by the context by adding the new value.
42 * @param context <code>Context</code>, not null
43 * @param newValue value to be added, possibly null
44 */
45 public void update(Context context, Object newValue) {
46 if (newValue != null) {
47 Object subject = context.getBean();
48 if (subject != null && subject instanceof Collection) {
49 Collection collection = (Collection) subject;
50 collection.add(newValue);
51 }
52 }
53 }
54 }