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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.driver;

import static org.assertj.swing.edt.GuiActionRunner.execute;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.swing.JFileChooser;

import org.assertj.core.util.Strings;
import org.assertj.swing.annotation.RunsInEDT;

/**
 * Returns the text used in the "approve button" of a {@code JFileChooser}. This action is executed in the event
 * dispatch thread (EDT).
 *
 * @see JFileChooser#getApproveButtonText()
 * @see javax.swing.plaf.FileChooserUI#getApproveButtonText(JFileChooser)
 *
 * @author Alex Ruiz
 * @author Yvonne Wang
 */
final class JFileChooserApproveButtonTextQuery {
  @RunsInEDT
  static @Nullable String approveButtonTextFrom(final @Nonnull JFileChooser fileChooser) {
    return execute(() -> {
      String text = fileChooser.getApproveButtonText();
      if (!Strings.isNullOrEmpty(text)) {
        return text;
      }
      return fileChooser.getUI().getApproveButtonText(fileChooser);
    });
  }

  private JFileChooserApproveButtonTextQuery() {
  }
}