ReflectionBasedFocusOwnerFinder.java example

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assertj-swing-master
/**
 * 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 2012-2015 the original author or authors.
 */
package org.assertj.swing.core;

import static org.fest.reflect.core.Reflection.field;

import java.awt.Component;
import java.awt.KeyboardFocusManager;

import javax.annotation.Nullable;

/**
 * Finds the current focus owner using Java reflection.
 * 
 * @author Alex Ruiz
 */
class ReflectionBasedFocusOwnerFinder implements FocusOwnerFinderStrategy {
  @Override
  public @Nullable Component focusOwner() {
    return field("focusOwner").ofType(Component.class).in(KeyboardFocusManager.class).get();
  }
}