tableproducer.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 2000-2003, 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.
 *
 * -------------------
 * TableProducer.java
 * -------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: TableProducer.java,v 1.16.2.1 2003/12/21 23:28:46 taqua Exp $
 *
 * Changes
 * -------
 * 18-Jan-2003 : Initial version
 * 24-Feb-2003 : Fixed Checkstyle issues (DG);
 *
 */
package org.jfree.report.modules.output.table.base;

import java.awt.geom.Rectangle2D;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import org.jfree.report.Band;
import org.jfree.report.Element;
import org.jfree.report.JFreeReport;
import org.jfree.report.style.ElementStyleSheet;

/**
 * The TableProducer is responsible for creating the produced Table. After
 * the writer has finished the band layout process, the layouted bands are
 * forwarded into the TableProducer. The TableProducer coordinates the cell
 * creation process and collects the generated TableCellData. The raw CellData
 * objects are later transformed into a TableGridLayout.
 * <p>
 * This class defines the global contract and provides some helper methods for
 * the implementors.
 *
 * @author Thomas Morgner
 */
public abstract strictfp class TableProducer
{
  /** Literal text for the 'title' property name. */
  public static final String TITLE = "Title";

  /** Literal text for the 'author' property name. */
  public static final String AUTHOR = "Author";

  /** A constant to define that this layout has not yet printed any pages. */
  private static final int BEFORE_FIRST_PAGE = -1;

  /** the dummy mode flag. */
  private boolean dummy;

  /** the strict layout flag. */
  private boolean strictLayout;

  /** Storage for the output target properties. */
  private Properties properties;

  /** The layout. If in dummy mode, then this contains only the Bounds. */
  private TableGridBounds gridBounds;

  /** The collected grid bounds. This collection is used to store the table grid layout. */
  private TableLayoutInfo gridBoundsCollection;

  /** The layouted elements. Used during the non-dummy mode. */
  private TableGrid grid;

  /** The number of the current page. */
  private int page;

  /**
   * Creates a new TableProducer. This constructor should be used to create an
   * producer for the repagination process.
   *
   * @param gridBoundsCollection the layout information implementation used to create
   * the table layout.
   * @param strictLayout the strict layout flag. Set to true, to enable the strict
   * layout mode.
   */
  public TableProducer(final TableLayoutInfo gridBoundsCollection,
                       final boolean strictLayout)
  {
    this.page = BEFORE_FIRST_PAGE;
    this.properties = new Properties();
    this.dummy = true;
    this.strictLayout = strictLayout;
    this.gridBoundsCollection = gridBoundsCollection;
  }

  /**
   * Creates a new TableProducer. This constructor must be used to complete the content
   * creation after the pagination was done.
   *
   * @param gridBoundsCollection the layout information implementation used to create
   * the table layout.
   */
  public TableProducer(final TableLayoutInfo gridBoundsCollection)
  {
    if (gridBoundsCollection.getPageCount() == 0)
    {
      throw new IllegalArgumentException("The bounds collection must not be empty.");
    }
    this.page = BEFORE_FIRST_PAGE;
    this.properties = new Properties();
    this.dummy = false;
    this.gridBoundsCollection = gridBoundsCollection;
    //this.grid = new TableGrid(gridBoundsCollection.getLayoutForPage(0));
  }

  /** A useful constant for specifying the creator constant. */
  protected static final String CREATOR =
      JFreeReport.getInfo().getName()
      + " version "
      + JFreeReport.getInfo().getVersion();

  /**
   * Starts the report writing. This method is called before any other report handling
   * method is called. This method is called only once for a given instance.
   */
  public abstract void open();

  /**
   * Closes the report and finishs the report writing. Any used resource should
   * be freed when this method returns. The current page is already closed.
   * This method is called only once for a given instance.
   */
  public abstract void close();

  /**
   * Handles the end of a page. This calls commit() and clears the layout.
   */
  public void endPage()
  {
    commit();
    if (isDummy() == false)
    {
      clearCells();
    }
  }

  /**
   * Handles the start of a new page. The page name is given as parameter.
   * The TableWriter starts a new page whenever a manual pagebreak is found
   * in the report definition. The ReportProducer has been opened before.
   * <p>
   * Always make sure that you call <code>super.beginPage()</code> before
   * any elements are added by the producer.
   *
   * @param name the page name
   */
  public void beginPage(final String name)
  {
    page += 1;
    
    // the global layout reuses the layout grid from the first page to
    // unify the layout for all pages. The global layout is disabled by
    // default.
    if (isGlobalLayout() == false || page == 0)
    {
      if (isDummy())
      {
        gridBounds = new TableGridBounds(isStrictLayout());
        gridBoundsCollection.addLayout(gridBounds);
      }
      else
      {
        gridBounds = gridBoundsCollection.getLayoutForPage(page);
        grid = new TableGrid(gridBounds);
      }
    }
  }

  /**
   * Gets the TableProducer implementation of this TableProducer.
   *
   * @return the TableProducers TableCellDataFactory, which is used to create
   * the TableCellData.
   */
  public abstract TableCellDataFactory getCellDataFactory();

  /**
   * Clears the grid, removes all created cell bounds.
   */
  public void clearCellsBounds()
  {
    gridBounds.clear();
  }

  /**
   * Clears the contents of the table grid. The layout itself is not cleared, only all
   * data is removed.
   */
  public void clearCells()
  {
    if (isDummy() == false)
    {
      grid.clear();
    }
    else
    {
      throw new IllegalStateException("This is the dummy mode, no layout possible.");
    }
  }

  /**
   * Checks whether the current layout contains some content. Returns false, if the table
   * is empty.
   *
   * @return true, if there is content, false otherwise.
   */
  public boolean isLayoutContainsContent()
  {
    if (grid == null)
    {
      return false;
    }
    return grid.size() != 0;
  }

  /**
   * Calculates the positions for the table cells.
   *
   * @return The table grid layout.
   * @throws IllegalStateException if called while this producer is in dummy mode.
   */
  protected TableGridLayout layoutGrid()
  {
    if (isDummy() == false)
    {
      return grid.performLayout();
    }
    else
    {
      throw new IllegalStateException("This is the dummy mode, no layout possible.");
    }
  }

  /**
   * Adds a new TableCellData to the grid.
   *
   * @param data the new TableCellData.
   */
  protected void addCell(final TableCellData data)
  {
    if (isDummy() == false)
    {
      grid.addData(data);
    }
    else
    {
      gridBounds.addData(data);
    }
  }

  /**
   * Returns true, if the TableProducer is open. Only open producers
   * are able to write TableCells or to create TableCellData from Elements.
   *
   * @return checks, whether the TableProducer is open.
   */
  public abstract boolean isOpen();


  /**
   * Processes the layouted band. The band is inserted on the specified bounds in
   * the TableGrid.
   *
   * @param bounds the bounds that define where to print the given band on this logical page
   * @param band the band that should be spooled/printed
   * @return true, if at least one cell was accepted, false otherwise.
   */
  public boolean processBand(final Rectangle2D bounds, final Band band)
  {
    if (isOpen() == false)
    {
      throw new IllegalStateException("Producer already closed");
    }

    // do nothing if the band is invisble
    if (band.isVisible() == false)
    {
      return false;
    }

    // do nothing if the band has no height...
    if (bounds.getHeight() == 0)
    {
      return false;
    }