<BUG>package hudson.plugins.clover.results;
public class ClassCoverage extends AbstractCloverMetrics {</BUG>
public AbstractCloverMetrics getPreviousResult() {
<BUG>return null;  //To change body of implemented methods use File | Settings | File Templates.
}</BUG>
}

package hudson.plugins.clover.results;
import hudson.model.Run;
import hudson.plugins.clover.CloverBuildAction;
public class ClassCoverage extends AbstractCloverMetrics {
public AbstractCloverMetrics getPreviousResult() {
if (owner == null) return null;
Run prevBuild = owner.getPreviousBuild();
if (prevBuild == null) return null;
CloverBuildAction action = prevBuild.getAction(CloverBuildAction.class);
if (action == null) return null;
return action.findClassCoverage(getName());
