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/*
 * 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 2012-2018 the original author or authors.
 */
package org.assertj.swing.hierarchy;

import static org.assertj.core.util.Lists.emptyList;
import static org.assertj.core.util.Lists.newArrayList;

import java.awt.Component;
import java.awt.Container;
import java.util.Collection;

import org.jetbrains.annotations.NotNull;
import javax.swing.JMenu;

import org.assertj.swing.annotation.RunsInCurrentThread;

/**
 * 
 * Find children {@code Component}s in a {@code JMenu}.
 * 
 * 
 * 
 * Note: Methods in this class are accessed in the current executing thread. Such thread may or may not be the
 * event dispatch thread (EDT). Client code must call methods in this class from the EDT.
 * 
 * 
 * @author Yvonne Wang
 */
final class JMenuChildrenFinder implements ChildrenFinderStrategy {
  @RunsInCurrentThread
  @Override
  @NotNull
  public Collection nonExplicitChildrenOf(@NotNull Container c) {
    if (!(c instanceof JMenu)) {
      return emptyList();
    }
    return newArrayList((Component) ((JMenu) c).getPopupMenu());
  }
}