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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.util;

import static org.assertj.core.util.Preconditions.checkNotNull;

import java.awt.Toolkit;

import javax.annotation.Nonnull;

/**
 * Provider of {@code Toolkit}s.
 * 
 * @author Alex Ruiz
 */
public class ToolkitProvider {
  /**
   * @return the singleton instance of this class.
   */
  @Nonnull public static ToolkitProvider instance() {
    return SingletonHolder.instance;
  }

  @Nonnull public Toolkit defaultToolkit() {
    return checkNotNull(Toolkit.getDefaultToolkit());
  }

  // Thread-safe, lazy-loading singleton.
  private static class SingletonHolder {
    static ToolkitProvider instance = new ToolkitProvider();
  }
}