spool.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.
 *
 * ----------
 * Spool.java
 * ----------
 * (C)opyright 2002, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: Spool.java,v 1.3 2003/08/24 15:03:52 taqua Exp $
 *
 * Changes
 * -------
 * 03-Dec-2002 : Javadocs (DG);
 *
 */

package org.jfree.report.modules.output.pageable.base;

import java.util.ArrayList;

import org.jfree.report.modules.output.pageable.base.operations.PhysicalOperation;
import org.jfree.report.modules.output.pageable.base.operations.PhysicalOperationsCollector;

/**
 * A spool is a sequence of operations (instances of PhysicalOperation) that can be
 * applied to an OutputTarget.
 *
 * @author Thomas Morgner.
 */
public class Spool implements Cloneable, PhysicalOperationsCollector
{
  /** Storage for the operations. */
  private ArrayList operations;

  /**
   * Creates a new spool.
   */
  public Spool()
  {
    this.operations = new ArrayList();
  }

  /**
   * Checks whether this spool contains operations.
   *
   * @return true, if the spool is empty, false otherwise.
   */
  public boolean isEmpty()
  {
    return operations.isEmpty();
  }

  /**
   * Returns an array of operations.
   *
   * @return an array of operations.
   */
  public PhysicalOperation[] getOperations()
  {
    PhysicalOperation[] ops = new PhysicalOperation[operations.size()];
    ops = (PhysicalOperation[]) operations.toArray(ops);
    return ops;
  }

  /**
   * Adds an operation to the spool.
   *
   * @param op  the operation.
   */
  public void addOperation(final PhysicalOperation op)
  {
    operations.add(op);
  }

  /**
   * Appends the operations stored in a spool to the end of this spool's list.
   *
   * @param spool  the spool.
   */
  public void merge(final Spool spool)
  {
    operations.addAll(spool.operations);
  }

  /**
   * Clones the spool.
   *
   * @return the clone.
   *
   * @throws CloneNotSupportedException if cloning is not supported.
   */
  public Object clone() throws CloneNotSupportedException
  {
    final Spool s = (Spool) super.clone();
    s.operations = (ArrayList) operations.clone();
    return s;
  }
}