Get custom attribute key and value in Server-Side plugin

IWorkItemCommon workItemService= (IWorkItemCommon) getService(IWorkItemCommon.class);
// You have to add this class in plugin.xml

IAttribute attribute= workItemService.findAttribute(operation.getProcessArea().getProjectArea(), "ur_attr_id", monitor);

String currentWI_TaskType = sourceworkItem.getValue(attribute).toString();   
// return object type data maybe you want to convert

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension
         point="com.ibm.team.process.service.operationAdvisors">
      <operationAdvisor
            class="jazzdevapprovaladvisor.JazzDevApprovalSave"
            id="JazzDevApprovalAdvisor"
            name="JazzDev Approval Advisor"
            operationId="com.ibm.team.workitem.operation.workItemSave">
            <extensionService componentId="JazzDevApprovalAdvisor" 
            	implementationClass="jazzdevapprovaladvisor.JazzDevApprovalSave">
            	<prerequisites> 
					<requiredService interface="com.ibm.team.repository.service.IRepositoryItemService" />
					<optionalservice interface="com.ibm.team.repository.common.service.IContributorService"/> 
					<optionalservice interface="com.ibm.team.workitem.common.IWorkItemCommon"/>   
				</prerequisites>  
			 </extensionService>
      </operationAdvisor>
   </extension>
</plugin>

I'm developing a server-side plug-in to compare a custom attribute
value of my own workitem between previous and current.

My code is like below.
I can successfully see some summary data.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Object data= operation.getOperationData();

if (data instanceof ISaveParameter) {
IAuditable auditable = ((ISaveParameter) data).getNewState();

if (auditable instanceof IWorkItem) {
IWorkItem workItem = (IWorkItem) auditable;
System.out.println("Summary : " +
workItem.getHTMLSummary());
// I need to get custom attribute key and value to compare previous
and current.
...
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Is there any example code to get custom attribute of my workitem?
Any help will be appriciated.

You can use (pseudo-code):

IWorkItemCommon workItemService=
saveParameter.getAuditableCommon().getPeer(IWorkItemCommon.class);

IAttribute attribute= workItemService.findAttribute(projectArea, "your
custom attribute id", monitor);

Object value= workItem.getValue(attribute);

--
Regards,
Patrick
RTC Work Item Component Lead

Thanks for your comment.

I'm able to get current value of custom attribute.

However I need to get previous data to compare with current value.

How can I do this?

Thanks in advance.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
public class OperationAdvisor extends AbstractService implements IOperationAdvisor {

public void run(AdvisableOperation operation,
IProcessConfigurationElement advisorConfiguration,
IAdvisorInfoCollector collector, IProgressMonitor monitor)
throws TeamRepositoryException {

try {

System.out.println("#################### starts ######################");


Object data= operation.getOperationData();

if (data instanceof ISaveParameter) {
IAuditable auditable = ((ISaveParameter) data).getNewState();

IWorkItemCommon workItemService = ((ISaveParameter)data).getSaveOperationParameter().getAuditableCommon().getPeer(IWorkItemCommon.class);


IAttribute attribute= workItemService.findAttribute(operation.getProcessArea().getProjectArea(), "custom_attribute", monitor);

IWorkItem workItem = (IWorkItem) auditable;
System.out.println("value="+workItem.getValue(attribute));

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks for your comment.

I'm able to get current value of custom attribute.

However I need to get previous data to compare with current value.

How can I do this?

The ISaveParameter has two methods:

getNewState() --> The work item with the current, modified values.
getOldState() --> The original state as it exists in the repo.

--
Regards,
Patrick
RTC Work Item Component Lead

I figured it out.
Thanks for your support.