content: /*
   * Created on Oct 24, 2007
   * 
   * 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.
   * 
   * Copyright @2007-2013 the original author or authors.
   */
  package org.fest.swing.hierarchy;
  
  import static org.fest.util.Lists.emptyList;
  import static org.fest.util.Lists.newArrayList;
  
  import java.awt.Component;
  import java.awt.Container;
  import java.util.Collection;
  import java.util.List;
  
  import javax.annotation.Nonnull;
  
  import org.fest.swing.annotation.RunsInCurrentThread;
  import org.fest.util.VisibleForTesting;
  
  /**
   * Find children {@code Component}s in an AWT or Swing {@code Container}.
   * 
   * @author Yvonne Wang
   * @author Alex Ruiz
   */
  class ChildrenFinder {
    private static List<ChildrenFinderStrategy> strategies = newArrayList(new JDesktopPaneChildrenFinder(),
        new JMenuChildrenFinder(), new WindowChildrenFinder());
  
    @RunsInCurrentThread
    @Nonnull Collection<Component> childrenOf(@Nonnull Component c) {
      if (!(c instanceof Container)) {
        return emptyList();
      }
      Container container = (Container) c;
      List<Component> children = newArrayList(container.getComponents());
      children.addAll(nonExplicitChildrenOf(container));
      return children;
    }
  
    private @Nonnull Collection<Component> nonExplicitChildrenOf(@Nonnull Container c) {
      Collection<Component> children = newArrayList();
      for (ChildrenFinderStrategy s : strategies) {
        children.addAll(s.nonExplicitChildrenOf(c));
      }
      return children;
    }
  
    @VisibleForTesting
    static @Nonnull List<ChildrenFinderStrategy> strategies() {
      return newArrayList(strategies);
    }
  
    @VisibleForTesting
    static void replaceStrategiesWith(@Nonnull List<ChildrenFinderStrategy> newStrategies) {
      strategies = newArrayList(newStrategies);
    }
  }
  