How to use

contains

method

in

hudson.util.DescribableList

/**
 * Creates a list of {@link MavenReporter}s to be used for a build of this project.
 */
protected List<MavenReporter> createReporters() {
  Set<MavenReporter> reporterSet = new TreeSet<>(COMPARATOR);
  getReporters().addAllTo( reporterSet );
  getParent().getReporters().addAllTo(reporterSet);
  
  for (MavenReporterDescriptor d : MavenReporterDescriptor.all()) {
    if(getReporters().contains(d))
      continue;   // already configured
    MavenReporter auto = d.newAutoInstance(this);
    if(auto!=null)
      reporterSet.add(auto);
  }
  return new ArrayList<MavenReporter>(reporterSet);
}

/**
 * Creates a list of {@link MavenReporter}s to be used for a build of this project.
 */
protected List<MavenReporter> createReporters() {
  List<MavenReporter> reporterList = new ArrayList<MavenReporter>();
  getReporters().addAllTo(reporterList);
  getParent().getReporters().addAllTo(reporterList);
  for (MavenReporterDescriptor d : MavenReporterDescriptor.all()) {
    if(getReporters().contains(d))
      continue;   // already configured
    MavenReporter auto = d.newAutoInstance(this);
    if(auto!=null)
      reporterList.add(auto);
  }
  return reporterList;
}

if (!wrappers.contains(wrapper.getDescriptor())) wrappers.add(wrapper);