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

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

import javax.annotation.Nonnull;

import org.assertj.core.util.VisibleForTesting;

/**
 * 
 * Installs AWT exception handlers.
 * 
 * 
 * 
 * An exception handler is passed to the JVM using the system property "sun.awt.exception.handler" to override the
 * default exception handling behavior of the event dispatch thread (EDT).
 * 
 * 
 * 
 * This is a Sun-specific feature (or "bug"). See bug 4714232.
 * 
 * 
 * @author Alex Ruiz
 */
public final class AWTExceptionHandlerInstaller {
  private static final SystemPropertyWriter WRITER = new SystemPropertyWriter();

  /**
   * Installs the given exception handler type.
   * 
   * @param exceptionHandlerType the type of exception handler to be installed in the current JVM.
   * @throws IllegalArgumentException if the given type does not have a default constructor.
   */
  public static void installAWTExceptionHandler(@Nonnull Class exceptionHandlerType) {
    installAWTExceptionHandler(exceptionHandlerType, WRITER);
  }

  @VisibleForTesting
  static void installAWTExceptionHandler(@Nonnull Class exceptionHandlerType, SystemPropertyWriter writer) {
    try {
      constructor().in(exceptionHandlerType).info();
    } catch (RuntimeException e) {
      throw new IllegalArgumentException("The exception handler type should have a default constructor");
    }
    writer.updateSystemProperty("sun.awt.exception.handler", exceptionHandlerType.getName());
  }

  private AWTExceptionHandlerInstaller() {
  }
}