content: /*
   * Created on Apr 12, 2008
   * 
   * 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 @2008-2013 the original author or authors.
   */
  package org.fest.swing.driver;
  
  import static org.fest.swing.driver.ModelValueToString.asText;
  import static org.fest.util.Preconditions.checkNotNull;
  
  import java.awt.Component;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import javax.swing.JList;
  
  import org.fest.swing.annotation.RunsInCurrentThread;
  import org.fest.swing.cell.JListCellReader;
  
  /**
   * Default implementation of {@link JListCellReader}.
   * 
   * @author Alex Ruiz
   * @author Yvonne Wang
   */
  public class BasicJListCellReader implements JListCellReader {
    private final CellRendererReader rendererReader;
  
    /**
     * Creates a new {@link BasicJListCellReader} that uses a {@link BasicCellRendererReader} to read the value from the
     * cell renderer component in a {@code JList}.
     */
    public BasicJListCellReader() {
      this(new BasicCellRendererReader());
    }
  
    /**
     * Creates a new {@link BasicJListCellReader}.
     * 
     * @param rendererReader knows how to read values from the cell renderer component in a {@code JList}.
     * @throws NullPointerException if {@code rendererReader} is {@code null}.
     */
    public BasicJListCellReader(@Nonnull CellRendererReader rendererReader) {
      this.rendererReader = checkNotNull(rendererReader);
    }
  
    /**
     * <p>
     * Returns the internal value of a cell in a {@code JList} as expected in a test.
     * </p>
     * 
     * <p>
     * <b>Note:</b> This method is accessed in the current executing thread. Such thread may or may not be the event
     * dispatch thread (EDT.) Client code must call this method from the EDT.
     * </p>
     * 
     * @param list the given {@code JList}.
     * @param index the index of the cell.
     * @return the internal value of a cell in a {@code JList} as expected in a test.
     * @see CellRendererReader#valueFrom(Component)
     */
    @Override
    @RunsInCurrentThread
    public @Nullable String valueAt(@Nonnull JList list, int index) {
      Object element = list.getModel().getElementAt(index);
      Component c = list.getCellRenderer().getListCellRendererComponent(list, element, index, true, true);
      String value = (c != null) ? rendererReader.valueFrom(c) : null;
      if (value != null) {
        return value;
      }
      return asText(element);
    }
  }
  