ISourceContainer[] getSourceContainers(String location, String id) throws CoreException {

    ISourceContainer[] containers = (ISourceContainer[]) fSourceContainerMap.get(location);
    if (containers != null) {
      return containers;
    }

    ArrayList result = new ArrayList();
    ModelEntry entry = MonitorRegistry.findEntry(id);

    boolean match = false;

    IMonitorModelBase[] models = entry.getWorkspaceModels();
    for (int i = 0; i < models.length; i++) {
      if (isPerfectMatch(models[i], new Path(location))) {
        IResource resource = models[i].getUnderlyingResource();
        // if the plug-in matches a workspace model,
        // add the project and any libraries not coming via a container
        // to the list of source containers, in that order
        if (resource != null) {
          addProjectSourceContainers(resource.getProject(), result);
        }
        match = true;
        break;
      }
    }

    if (!match) {
      File file = new File(location);
      if (file.isFile()) {
        // in case of linked plug-in projects that map to an external JARd plug-in,
        // use source container that maps to the library in the linked project.
        ISourceContainer container = getArchiveSourceContainer(location);
        if (container != null) {
          containers = new ISourceContainer[] {container};
          fSourceContainerMap.put(location, containers);
          return containers;
        }
      }

      models = entry.getExternalModels();
      for (int i = 0; i < models.length; i++) {
        if (isPerfectMatch(models[i], new Path(location))) {
          // try all source zips found in the source code locations
          IClasspathEntry[] entries = MDEClasspathContainer.getExternalEntries(models[i]);
          for (int j = 0; j < entries.length; j++) {
            IRuntimeClasspathEntry rte = convertClasspathEntry(entries[j]);
            if (rte != null) result.add(rte);
          }
          break;
        }
      }
    }

    IRuntimeClasspathEntry[] entries =
        (IRuntimeClasspathEntry[]) result.toArray(new IRuntimeClasspathEntry[result.size()]);
    containers = JavaRuntime.getSourceContainers(entries);
    fSourceContainerMap.put(location, containers);
    return containers;
  }
 /* (non-Javadoc)
  * @see org.eclipse.debug.core.sourcelookup.AbstractSourceLookupDirector#dispose()
  */
 public synchronized void dispose() {
   Iterator iterator = fSourceContainerMap.values().iterator();
   while (iterator.hasNext()) {
     ISourceContainer[] containers = (ISourceContainer[]) iterator.next();
     for (int i = 0; i < containers.length; i++) {
       containers[i].dispose();
     }
   }
   fSourceContainerMap.clear();
   super.dispose();
 }