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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.driver;

import static org.assertj.core.util.Preconditions.checkNotNull;
import static org.assertj.swing.edt.GuiActionRunner.execute;

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

import org.assertj.swing.annotation.RunsInEDT;
import org.assertj.swing.cell.JComboBoxCellReader;
import org.assertj.swing.edt.GuiQuery;

/**
 * Returns an array of {@code String}s that represents the contents of a given {@code JComboBox}. This action is
 * executed in the event dispatch thread (EDT.)
 *
 * @author Alex Ruiz
 */
final class JComboBoxContentQuery {
  @RunsInEDT
  static @Nonnull String[] contents(final @Nonnull JComboBox comboBox, final @Nonnull JComboBoxCellReader cellReader) {
    String[] result = execute(new GuiQuery() {
      @Override
      protected @Nullable String[] executeInEDT() {
        int itemCount = comboBox.getItemCount();
        String[] values = new String[itemCount];
        for (int i = 0; i < itemCount; i++) {
          values[i] = cellReader.valueAt(comboBox, i);
        }
        return values;
      }
    });
    return checkNotNull(result);
  }

  private JComboBoxContentQuery() {
  }
}