[news.eclipse.platform.rcp] How to wait for build job?

[svelganesh@xxxxxxxxx (Velganesh Subramanian)]

I have a user job that generates few html files from a given EMF model. My 
application is in such a way that the EMF model is not ready until the 
build job is complete.

After going through the code for 'Clean...' action (under Project menu), I 
found that 'ResourcesPlugin.getWorkspace().getRuleFactory().buildRule()' 
is used to check for conflicts. In my isConflicting(), I have 

if (rule.getClass() == ResourcesPlugin.getWorkspace().getRuleFactory()
				.buildRule().getClass())
	return true;

But my job simply proceeds with its file generation logic without waiting 
for build to complete. How do I make my job to wait for build job to 
complete?