1 package net.sf.fastxmldb.impl;
2
3 import java.util.Collections;
4 import java.util.HashMap;
5 import java.util.Map;
6 import org.xmldb.api.base.Collection;
7 import org.xmldb.api.base.XMLDBException;
8
9 /***
10 * The CollectionBroker is responsible for keeping track
11 * of all created collections and the default collection
12 * @author jbirchfield
13 */
14 public class CollectionBroker {
15
16 private static CollectionBroker instance;
17
18 private Map collections = null;
19
20 /***
21 *
22 * @return CollectionBroker the static instance
23 */
24 public static CollectionBroker getInstance() {
25 if (instance == null) {
26 instance = new CollectionBroker();
27 }
28 return instance;
29 }
30
31 private CollectionBroker() {
32 collections = new HashMap(10);
33 Collections.synchronizedMap(collections);
34 createDefaultCollection();
35 }
36
37 private void createDefaultCollection() {
38 Collection collection = new LocalCollection("default");
39 try {
40 addCollection(collection);
41 } catch (XMLDBException e) {
42 e.printStackTrace();
43 }
44 }
45
46 /***
47 *
48 * @param name the name of the collection
49 * @return Collection the Collection object
50 */
51 public Collection getCollection(String name) {
52 return (Collection) collections.get(name);
53 }
54
55 /***
56 *
57 * @param collection the collection to add
58 * @throws XMLDBException if an exception occurs during the
59 * getName of a collection
60 */
61 public void addCollection(Collection collection) throws XMLDBException {
62 collections.put(collection.getName(), collection);
63 }
64
65 /***
66 *
67 * @return int the number of collections. Should always be at least 1
68 */
69 public int getCollectionCount() {
70 return collections.size();
71 }
72
73 /***
74 * Clear all the collections and recreate the default one
75 */
76 public void clearCollections() {
77 collections.clear();
78 createDefaultCollection();
79 }
80 }
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