Jira: How to obtain the previous value for a custom field in a custom IssueEventListener

So how does one obtain the previous value of a custom field in a Jira IssueEventListener? I am writing a custom handler for the issueUpdated(IssueEvent) event and I would like to alter the handler's behavior if a certain custom field has changed. To detect the type of change I would like to compare the previous and current values.

(I'm am not asking about how to obtain its current value - I know how to get that from the related Issue)

I am developing against Jira 4.0.2 on Windows.

Is the best way to scan the change h开发者_如何学Cistory for the last known value?

List changes = changeHistoryManager.getChangeHistoriesForUser(issue, user);

I'm assuming the original poster is writing a JIRA plugin with Java. I cannot be certain of how to accomplish this task in JIRA v4.0.2, but here is how I managed to do so with JIRA v5.0.2 (the solutions may very well be the same):

public void workflowEvent( IssueEvent event )
{
  Long eventTypeId = event.getEventTypeId();
  if( eventTypeId.equals( EventType.ISSUE_UPDATED_ID ) )
  {
    List<GenericValue> changeItemList = null;
    try
    {
      changeItemList = event.getChangeLog().getRelated( "ChildChangeItem" );
    }
    catch( GenericEntityException e )
    {
      // Error or do what you need to do here.
      e.printStackTrace();
    }

    if( changeItemList == null )
    {
      // Same deal here.
      return;
    }

    Iterator<GenericValue> changeItemListIterator = changeItemList.iterator();
    while( changeItemListIterator.hasNext() )
    {
      GenericValue changeItem = ( GenericValue )changeItemListIterator.next();
      String fieldName = changeItem.get( "field" ).toString();
      if( fieldName.equals( customFieldName ) ) // Name of custom field.
      {
        Object oldValue = changeItem.get( "oldvalue" );
        Object newValue = changeItem.get( "newvalue" );
      }
    }
  }
}

Some possible key values for changeItem are:

• newvalue
• oldstring
• field
• id
• fieldtype
• newstring
• oldvalue
• group

For many of the custom field types Object oldValue is probably just a String. But I don't think that's true for every case.

Try this example :

String codeProjetOldValue= "";

List<GenericValue> changeItemList = issueEvent.getChangeLog().getRelated("ChildChangeItem");                
for (GenericValue genericValue : changeItemList) {                          
    if(champCodeProjet.equals(genericValue.get("field"))){
        codeProjetOldValue=genericValue.getString("oldstring");
        break;
    }
}

Note that : champCodeProjet is the name of customfield.