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Fluent interface for functional GUI testing

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

import static java.util.logging.Level.WARNING;
import static org.fest.reflect.core.Reflection.field;

import java.util.TimerTask;
import java.util.logging.Logger;

import org.assertj.core.util.Preconditions;

/**
 * Prevents misbehaving {@code TimerTask}s from canceling the timer thread by throwing exceptions and/or errors.
 * 
 * @author Alex Ruiz
 */
class ProtectingTimerTask extends TimerTask {
  private static final int CANCELED = 3;

  private static Logger logger = Logger.getLogger(ProtectingTimerTask.class.getCanonicalName());

  private final TimerTask task;

  ProtectingTimerTask(TimerTask task) {
    this.task = task;
  }

  @Override
  public void run() {
    if (isCanceled()) {
      cancel();
      return;
    }
    try {
      task.run();
    } catch (Throwable thrown) {
      handleException(thrown);
    }
  }

  private boolean isCanceled() {
    try {
      int state = Preconditions.checkNotNull(field("state").ofType(int.class).in(task).get());
      return state == CANCELED;
    } catch (RuntimeException e) {
      handleException(e);
    }
    return false;
  }

  private void handleException(Throwable thrown) {
    logger.log(WARNING, "Exception thrown by a TimerTask", thrown);
  }
}