code: public void setFaceDescriptors(Map faceDescriptors) {
  		Assert.notNull(faceDescriptors);
  		Iterator it = faceDescriptors.entrySet().iterator();
  		while (it.hasNext()) {
  			Map.Entry entry = (Map.Entry) it.next();
  			String faceDescriptorId = (String) entry.getKey();
  			CommandFaceDescriptor faceDescriptor = (CommandFaceDescriptor) entry.getValue();
  			setFaceDescriptor(faceDescriptorId, faceDescriptor);
  		}
  	}
docs: Add a number of {@link CommandFaceDescriptor}s to this Command.
  
  @param faceDescriptors a {@link Map} which contains &lt;faceDescriptorId,
  CommandFaceDescriptor&gt; pairs.