| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.enterprise.adaptor; |
| |
| import java.util.*; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| |
| /** |
| * Collection of various status LED sources. |
| * |
| * <p>This class is thread-safe. |
| */ |
| class StatusMonitor { |
| private List<StatusSource> sources = new CopyOnWriteArrayList<StatusSource>(); |
| |
| public Map<StatusSource, Status> retrieveStatuses() { |
| Map<StatusSource, Status> statuses |
| = new LinkedHashMap<StatusSource, Status>(sources.size() * 2); |
| for (StatusSource source : sources) { |
| statuses.put(source, source.retrieveStatus()); |
| } |
| return statuses; |
| } |
| |
| /** |
| * Add a {@code StatusSource}. |
| * |
| * @throws NullPointerException when {@code source} is {@code null} |
| */ |
| public void addSource(StatusSource source) { |
| if (source == null) { |
| throw new NullPointerException(); |
| } |
| sources.add(source); |
| } |
| |
| public void removeSource(StatusSource source) { |
| sources.remove(source); |
| } |
| |
| public void clearSources() { |
| sources.clear(); |
| } |
| } |