[ RTC Client Lib ] SC - How to get ChangeSet(All files changes) from IWorkItem item by Program

Source From Here 
Question 
How to get ChangeSet(All files changes) from IWorkItem item by Program. I want a list contains all the files that got change for a RTC. how can I achieve this? 

How-To 
You can see if this thread helps: (from the client side) 

* repository is an ITeamRepository
* mgr is an IItemManager (repository.itemManager())
* workItem is the IWorkItem for which we want changesets
* items holds the set of associated changeset links for the workitem

Below is the code snippet: 

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1. IClientLibraryContext ctx = (IClientLibraryContext)repository;  
2. IQueryService svc = (IQueryService)ctx.getServiceInterface(IQueryService.class);  
3. AuditableLinkQueryModel alqr = AuditableLinkQueryModel.ROOT;  
4. IItemQuery iq = IItemQuery.FACTORY.newInstance(alqr);  
5.   
6. iq.filter(alqr.name()._eq("com.ibm.team.filesystem.workitems.change_set").  
7.   _and( alqr.targetRef().referencedItem().itemId()._eq(iq.newUUIDArg())));  
8.   
9. IItemQueryPage itemQueryPage = svc.queryItems(  
10.   iq,  
11.   new Object[] { workItem.getItemId() },   
12.   IQueryService.ITEM_QUERY_MAX_PAGE_SIZE);  
13.   
14. List items = mgr.fetchCompleteItems(itemQueryPage.getItemHandles(),   
15.                                     mgr.DEFAULT, null);  
16. Set changedFilesAndFolders = new TreeSet();  
17. for (IChangeSet cs: changeSets) {  
18.    ...  
19. }  

You would still need to list files within each change set of items. you have some idea to list files in: 

* "How to get an IConfiguration from IChangeSet?"
* "how get Full path of the File from changeset Using API?"

Other sources: 

* "Setting up Rational Team Concert for API Development"
* "The RTC WorkItem Client Link API – Linking to Work Items and Other Elements"

Below is the full sample code which will retrieve change set from workitem and show the file name(s) of change set as well: 
- RetrieveChangeSetFromWorkItem.java 

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1. package test.pub;  
2.   
3. import org.eclipse.core.runtime.IProgressMonitor;  
4. import org.eclipse.core.runtime.NullProgressMonitor;  
5.   
6. import com.ibm.team.repository.client.ITeamRepository;  
7. import com.ibm.team.repository.client.TeamPlatform;  
8. import com.ibm.team.repository.client.ITeamRepository.ILoginHandler;  
9. import com.ibm.team.repository.client.ITeamRepository.ILoginHandler.ILoginInfo;  
10. import com.ibm.team.repository.common.TeamRepositoryException;  
11.   
12. import java.util.List;  
13.   
14. import com.ibm.team.build.client.ITeamBuildClient;  
15. import com.ibm.team.filesystem.common.IFileItem;  
16. import com.ibm.team.filesystem.common.IFileItemHandle;  
17. import com.ibm.team.links.client.ILinkManager;  
18. import com.ibm.team.links.common.IItemReference;  
19. import com.ibm.team.links.common.ILink;  
20. import com.ibm.team.links.common.ILinkCollection;  
21. import com.ibm.team.links.common.ILinkQueryPage;  
22. import com.ibm.team.links.common.factory.IReferenceFactory;  
23. import com.ibm.team.process.client.IProcessClientService;  
24. import com.ibm.team.repository.client.IItemManager;  
25. import com.ibm.team.repository.client.TeamPlatform;  
26. import com.ibm.team.repository.common.TeamRepositoryException;  
27. import com.ibm.team.scm.client.IVersionableManager;  
28. import com.ibm.team.scm.client.SCMPlatform;  
29. import com.ibm.team.scm.common.IChangeSet;  
30. import com.ibm.team.scm.common.IChangeSetHandle;  
31. import com.ibm.team.scm.common.IVersionableHandle;  
32. import com.ibm.team.scm.common.internal.Change;  
33. import com.ibm.team.workitem.client.IAuditableClient;  
34. import com.ibm.team.workitem.client.IWorkItemClient;  
35. import com.ibm.team.workitem.common.model.IWorkItem;  
36. import com.ibm.team.workitem.common.model.WorkItemLinkTypes;  
37.   
38. public class RetrieveChangeSetFromWorkItem{  
39.     public static IProgressMonitor MyProgressMonitor = new NullProgressMonitor();  
40.     public static ITeamRepository TeamRepository = null;  
41.       
42.     public static String repositoryURI = "...";  
43.     public static String userId = "...";  
44.     public static String password = "...";  
45.       
46.     public static void Start(String wi) throws Exception {  
47.         IProcessClientService processClient = (IProcessClientService) TeamRepository  
48.                 .getClientLibrary(IProcessClientService.class);  
49.         IAuditableClient auditableClient = (IAuditableClient) TeamRepository  
50.                 .getClientLibrary(IAuditableClient.class);  
51.         IWorkItemClient workItemClient = (IWorkItemClient) TeamRepository  
52.                 .getClientLibrary(IWorkItemClient.class);  
53.         ITeamBuildClient buildClient = (ITeamBuildClient) TeamRepository  
54.                 .getClientLibrary(ITeamBuildClient.class);  
55.         ILinkManager linkManager = (ILinkManager) TeamRepository  
56.                 .getClientLibrary(ILinkManager.class);  
57.         IVersionableManager vm = SCMPlatform.getWorkspaceManager(TeamRepository).versionableManager();  
58.   
59.         IWorkItem task = workItemClient.findWorkItemById(Integer.parseInt(wi),  
60.                 IWorkItem.FULL_PROFILE, null);  
61.   
62.         IItemReference linkTarget = IReferenceFactory.INSTANCE  
63.                 .createReferenceToItem(task);  
64.         // Get alist of all change sets  
65.         ILinkQueryPage changeSets = linkManager.findLinksByTarget(  
66.                 WorkItemLinkTypes.CHANGE_SET, linkTarget,  
67.                 new NullProgressMonitor());  
68.         System.out.printf("\t[Info] Change Set Of WorkItem(%s):\n", wi);  
69.         ILinkCollection linkCollection = changeSets.getLinks();  
70.         for (ILink iLink : linkCollection) {  
71.             IChangeSetHandle changeSetHandle = (IChangeSetHandle) iLink  
72.                     .getSourceRef().resolve();  
73.             IChangeSet changeset = (IChangeSet) TeamRepository.itemManager()  
74.                     .fetchCompleteItem(changeSetHandle, IItemManager.DEFAULT, null);  
75.             System.out.printf("\t%s\n", changeset.getComment());  
76.             List changes = changeset.changes();  
77.             for(Object change:changes)  
78.             {  
79.                 Change c = (Change) change;  
80.                 IVersionableHandle after = c.afterState();  
81.                 if(after!=null && after instanceof IFileItemHandle)  
82.                 {  
83.                     IFileItem fileItem = (IFileItem) vm.fetchCompleteState(after, null);  
84.                     System.out.printf("\t\t%s\n", fileItem.getName());  
85.                 }  
86.             }  
87.         }  
88.     }  
89.   
90.     /** 
91.      * How to get ChangeSet(All files changes) from IWorkItem item by Program 
92.      *  http://stackoverflow.com/questions/24628644/how-to-get-changesetall-files-changes-from-iworkitem-item-by-program 
93.      *  https://jazz.net/forum/questions/128294/want-to-read-all-changesets-associated-with-a-work-item 
94.      * @param args 
95.      * @throws Exception 
96.      */  
97.     public static void main(String[] args) throws Exception{  
98.         String workItemID = "68418";  
99.         TeamPlatform.startup();  
100.         try {             
101.             Login();  
102.             Start(workItemID);  
103.         } catch (TeamRepositoryException e) {  
104.             System.out.println("Unable to login: " + e.getMessage());  
105.         } finally {  
106.             TeamPlatform.shutdown();  
107.         }  
108.     }  
109.   
110.     private static class LoginHandler implements ILoginHandler, ILoginInfo {  
111.   
112.         private String fUserId;  
113.         private String fPassword;  
114.   
115.         private LoginHandler(String userId, String password) {  
116.             fUserId = userId;  
117.             fPassword = password;  
118.         }  
119.   
120.         public String getUserId() {  
121.             return fUserId;  
122.         }  
123.   
124.         public String getPassword() {  
125.             return fPassword;  
126.         }  
127.   
128.         public ILoginInfo challenge(ITeamRepository repository) {  
129.             return this;  
130.         }  
131.     }  
132.       
133.     public static void Login() throws TeamRepositoryException {  
134.         ITeamRepository teamRepository = TeamPlatform.getTeamRepositoryService().getTeamRepository(repositoryURI);  
135.         teamRepository.registerLoginHandler(new LoginHandler(userId, password));  
136.         teamRepository.login(MyProgressMonitor);  
137.         TeamRepository = teamRepository;  
138.     }  
139. }