content: /*
   * Created on Apr 14, 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.util.Strings.isDefaultToString;
  import static org.fest.util.Preconditions.checkNotNull;
  
  import java.awt.Component;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import javax.swing.JTree;
  import javax.swing.tree.TreeCellRenderer;
  
  import org.fest.swing.annotation.RunsInCurrentThread;
  import org.fest.swing.cell.JTreeCellReader;
  
  /**
   * Default implementation of {@link JTreeCellReader}.
   * 
   * @author Yvonne Wang
   * @author Alex Ruiz
   */
  public class BasicJTreeCellReader implements JTreeCellReader {
    private final CellRendererReader rendererReader;
  
    /**
     * Creates a new {@link BasicJTreeCellReader} that uses a {@link BasicCellRendererReader} to read the value from the
     * cell renderer component in a {@code JTree}.
     */
    public BasicJTreeCellReader() {
      this(new BasicCellRendererReader());
    }
  
    /**
     * Creates a new {@link BasicJTreeCellReader}.
     * 
     * @param reader knows how to read values from the cell renderer component in a {@code JTree}.
     * @throws NullPointerException if {@code reader} is {@code null}.
     */
    public BasicJTreeCellReader(@Nonnull CellRendererReader reader) {
      this.rendererReader = checkNotNull(reader);
    }
  
    /**
     * <p>
     * Returns the internal value of a cell in a {@code JTree} 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 tree the given {@code JTree}.
     * @param modelValue the value of a cell, retrieved from the model.
     * @return the internal value of a cell in a {@code JTree} as expected in a test.
     */
    @Override
    @RunsInCurrentThread
    public @Nullable String valueAt(@Nonnull JTree tree, @Nullable Object modelValue) {
      TreeCellRenderer r = tree.getCellRenderer();
      Component c = r.getTreeCellRendererComponent(tree, modelValue, false, false, false, 0, false);
      String value = (c != null) ? rendererReader.valueFrom(c) : null;
      if (value != null) {
        return value;
      }
      value = tree.convertValueToText(modelValue, false, false, false, 0, false);
      if (isDefaultToString(value)) {
        return null;
      }
      return value;
    }
  }
  