datatarget.java

swing编写的库存管理程序。毕业设计类

/**
 * ========================================
 * JFreeReport : a free Java report library
 * ========================================
 *
 * Project Info:  http://www.jfree.org/jfreereport/index.html
 * Project Lead:  Thomas Morgner;
 *
 * (C) Copyright 2000-2002, 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.
 *
 * ---------------
 * DataTarget.java
 * ---------------
 * (C)opyright 2002, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: DataTarget.java,v 1.2 2003/08/24 15:13:22 taqua Exp $
 *
 * Changes
 * -------
 * 20-May-2002 : Initial version
 * 06-Jun-2002 : Updated Javadoc comments.
 * 03-Jul-2002 : Cloneable and Serializable
 */

package org.jfree.report.filter;

import java.io.Serializable;

/**
 * A DataTarget is a consumer in the DataProcessing chain. All Elements are DataTargets.
 * Targets query their data from assigned DataSources.
 *
 * @author Thomas Morgner
 */
public interface DataTarget extends Serializable, Cloneable
{
  /**
   * Returns the assigned DataSource for this Target.
   *
   * @return The datasource.
   */
  public DataSource getDataSource();

  /**
   * Assigns a DataSource for this Target.
   *
   * @param ds The data source.
   */
  public void setDataSource(DataSource ds);

  /**
   * Clones this datatarget.
   *
   * @return a clone of the datatarget.
   *
   * @throws CloneNotSupportedException this should never happen.
   */
  public Object clone() throws CloneNotSupportedException;
}