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JIDE specific extensions for 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.jide.grids.driver;

import com.jidesoft.combobox.AbstractComboBox;
import com.jidesoft.converter.ObjectConverterManager;

/**
 * A CellReader for extracting a String representation of a value in an {@link AbstractComboBox}.
 *
 * @author Peter Murray
 */
public class AbstractComboBoxCellReader {

  /**
   * Returns the internal value of a cell in a {@link com.jidesoft.combobox.ListComboBox} as expected
   * in a test. This method first tries to get the value from the toString implementation of the object
   * stored in the JComboBox's model at the specified index. If it fails, it returns the value displayed in
   * the ListComboBox's cell renderer.
   *
   * @param comboBox the given ListComboBox.
   * @param index the index of the cell.
   * @return the internal value of a cell in a ListComboBox as expected in a test.
   */
  public String valueAt(AbstractComboBox comboBox, int index) {
    final Object item = itemAt(comboBox, index);
    return valueAsText(comboBox, item);
  }

  public String valueAsText(AbstractComboBox comboBox, Object value) {
    if (value == null) {
      return null;
    }

    if (comboBox.getConverter() != null) {
      return comboBox.getConverter().toString(value, comboBox.getConverterContext());
    }
    return ObjectConverterManager.toString(value,
                                           comboBox.getType(),
                                           comboBox.getConverterContext());
  }

  private Object itemAt(AbstractComboBox comboBox, int index) {
    return comboBox.getModel().getElementAt(index);
  }
}