1 /**
2 * Copyright 2005-2013 The Kuali Foundation
3 *
4 * Licensed under the Educational Community License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.opensource.org/licenses/ecl2.php
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.kuali.rice.krad;
17
18 import org.kuali.rice.kew.api.KewApiConstants;
19 import org.kuali.rice.kew.api.WorkflowDocument;
20
21 import java.util.Map;
22 import java.util.concurrent.ConcurrentHashMap;
23 import java.util.concurrent.ConcurrentMap;
24
25 /**
26 * Utility class for working with the UserSession.
27 */
28 public final class UserSessionUtils {
29
30 private UserSessionUtils() {
31 throw new IllegalStateException("this class should not be instantiated");
32 }
33
34 /**
35 * Adds the given {@link org.kuali.rice.kew.api.WorkflowDocument} to the {@link org.kuali.rice.krad.UserSession}.
36 * @param userSession the session to add the workflow document to
37 * @param workflowDocument the workflow doc to add to the session
38 */
39 public static void addWorkflowDocument(UserSession userSession, WorkflowDocument workflowDocument) {
40 Map<String, WorkflowDocument> workflowDocMap = getWorkflowDocumentMap(userSession);
41
42 workflowDocMap.put(workflowDocument.getDocumentId(), workflowDocument);
43 }
44
45 /**
46 * Returns the {@link org.kuali.rice.kew.api.WorkflowDocument} with the given ID from the
47 * {@link org.kuali.rice.krad.UserSession}. If there is not one cached in the session with
48 * that ID, then null is returned.
49 * @param userSession the user session from which to retrieve the workflow document
50 * @param workflowDocumentId the ID of the workflow document to get
51 * @return the cached workflow document, or null if a document with that ID is not cached in the user session
52 */
53 public static WorkflowDocument getWorkflowDocument(UserSession userSession, String workflowDocumentId) {
54 Map<String, WorkflowDocument> workflowDocMap = getWorkflowDocumentMap(userSession);
55
56 return workflowDocMap.get(workflowDocumentId);
57 }
58
59 /**
60 * Returns the map of workflow document IDs to {@link org.kuali.rice.kew.api.WorkflowDocument}, making sure to
61 * initialize in a thread-safe way if the map does not exist.
62 *
63 * <p>
64 * We assume the {@link org.kuali.rice.krad.UserSession} is not null here.
65 * </p>
66 * @param userSession the user session from which to retrieve the workflow document
67 * @return the map of workflow document IDs to workflow documents
68 */
69 private static Map<String, WorkflowDocument> getWorkflowDocumentMap(UserSession userSession) {
70 synchronized (userSession) {
71 @SuppressWarnings("unchecked") ConcurrentMap<String, WorkflowDocument> workflowDocMap =
72 (ConcurrentMap<String, WorkflowDocument>) userSession
73 .retrieveObject(KewApiConstants.WORKFLOW_DOCUMENT_MAP_ATTR_NAME);
74
75 if (workflowDocMap == null) {
76 workflowDocMap = new ConcurrentHashMap<String, WorkflowDocument>();
77 userSession.addObject(KewApiConstants.WORKFLOW_DOCUMENT_MAP_ATTR_NAME, workflowDocMap);
78 }
79
80 return workflowDocMap;
81 }
82 }
83 }