abstractelementrenderermodule.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.
 *
 * ------------------------------
 * AbstractElementRendererModule.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: AbstractElementRendererModule.java,v 1.2 2004/04/20 18:54:56 taqua Exp $
 *
 * Changes
 * -------------------------
 * 28.09.2003 : Initial version
 *
 */

package org.jfree.designer.visualeditor.bandeditor;

import org.jfree.report.Element;
import org.jfree.report.filter.DataRowConnectable;
import org.jfree.report.filter.DataSource;
import org.jfree.report.filter.DataTarget;

public abstract class AbstractElementRendererModule
        implements ElementRendererModule
{
  private final String contentType;

  public AbstractElementRendererModule (final String contentType)
  {
    this.contentType = contentType;
  }

  public boolean canHandle (final Element element)
  {
    if (isValidContentType(element) == false)
    {
      return false;
    }
    return true;
  }

  protected final boolean isValidContentType (final Element element)
  {
    if (element.getContentType().equals(contentType))
    {
      return true;
    }
    return false;
  }

  protected final boolean isDataRowContent (final Element element)
  {
    return isDataRowContent(element.getDataSource());
  }

  private boolean isDataRowContent (final DataSource dataSource)
  {
    if (dataSource instanceof DataRowConnectable)
    {
      return true;
    }
    else
    {
      if (dataSource instanceof DataTarget)
      {
        final DataTarget dt = (DataTarget) dataSource;
        if (isDataRowContent(dt.getDataSource()))
        {
          return true;
        }
      }
      return false;
    }
  }

  public final boolean isPreferredHandler ()
  {
    return false;
  }
}