reportdefinitionnode.java

报表设计软件,很好的

/**
 * ========================================
 * JFreeReport : a free Java report library
 * ========================================
 *
 * Project Info:  http://www.jfree.org/jfreereport/index.html
 * Project Lead:  Thomas Morgner ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Simba Management Limited and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ------------------------------
 * ReportDefinitionNode.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: ReportDefinitionNode.java,v 1.2 2004/04/20 18:55:02 taqua Exp $
 *
 * Changes
 * -------------------------
 * 21.10.2003 : Initial version
 *
 */

package org.jfree.designer.visualeditor.treemodel;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import javax.swing.tree.TreeNode;

import org.jfree.report.JFreeReport;

/**
 * This is the root node ...
 */
public final class ReportDefinitionNode
        implements TreeNode
{
  private final ArrayList nodes;
  private final JFreeReport report;

  public ReportDefinitionNode (final JFreeReport report)
  {
    nodes = new ArrayList();
    this.report = report;
  }

  public final void addNode (final TreeNode node)
  {
    if (node != null)
    {
    }
    nodes.add(node);
  }

  public final void clear ()
  {
    nodes.clear();
  }

  /**
   * Returns the children of the receiver as an <code>Enumeration</code>.
   */
  public final Enumeration children ()
  {
    return Collections.enumeration(nodes);
  }

  /**
   * Returns true if the receiver allows children.
   */
  public final boolean getAllowsChildren ()
  {
    return true;
  }

  /**
   * Returns the child <code>TreeNode</code> at index <code>childIndex</code>.
   */
  public final TreeNode getChildAt (final int childIndex)
  {
    return (TreeNode) nodes.get(childIndex);
  }

  /**
   * Returns the number of children <code>TreeNode</code>s the receiver contains.
   */
  public final int getChildCount ()
  {
    return nodes.size();
  }

  /**
   * Returns the index of <code>node</code> in the receivers children. If the receiver
   * does not contain <code>node</code>, -1 will be returned.
   */
  public final int getIndex (final TreeNode node)
  {
    return nodes.indexOf(node);
  }

  /**
   * Returns the parent <code>TreeNode</code> of the receiver.
   */
  public final TreeNode getParent ()
  {
    // this is the root node, we do not have an parent ...
    return null;
  }

  /**
   * Returns true if the receiver is a leaf.
   */
  public final boolean isLeaf ()
  {
    return false;
  }

  /**
   * Returns a string representation of the object. In general, the <code>toString</code>
   * method returns a string that "textually represents" this object. The result should be
   * a concise but informative representation that is easy for a person to read. It is
   * recommended that all subclasses override this method.
   * <p/>
   * The <code>toString</code> method for class <code>Object</code> returns a string
   * consisting of the name of the class of which the object is an instance, the at-sign
   * character `<code>@</code>', and the unsigned hexadecimal representation of the hash
   * code of the object. In other words, this method returns a string equal to the value
   * of: <blockquote>
   * <pre>
   * getClass().getName() + '@' + Integer.toHexString(hashCode())
   * </pre></blockquote>
   *
   * @return a string representation of the object.
   */
  public final String toString ()
  {
    if (report != null)
    {
      return report.getName();
    }
    return "<empty>";
  }
}