bandlayoutmanagerpropertyeditor.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.
 *
 * ------------------------------
 * BandLayoutManagerPropertyEditor.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: BandLayoutManagerPropertyEditor.java,v 1.2 2004/04/20 18:54:42 taqua Exp $
 *
 * Changes
 * -------------------------
 * 21.10.2003 : Initial version
 *
 */

package org.jfree.designer.propertyeditors;

public final class BandLayoutManagerPropertyEditor
        extends AbstractPropertyEditor
{
  public BandLayoutManagerPropertyEditor ()
  {
  }

  /**
   * This method is intended for use when generating Java code to set the value of the
   * property.  It should return a fragment of Java code that can be used to initialize a
   * variable with the current property value.
   * <p/>
   * Example results are "2", "new Color(127,127,34)", "Color.orange", etc.
   *
   * @return A fragment of Java code representing an initializer for the current value.
   */
  public final String getJavaInitializationString ()
  {
    if (getValue() == null)
    {
      return "null";
    }
    else
    {
      return "new (" + getValue().getClass().getName() + "())";
    }
  }

  /**
   * Set the property value by parsing a given String.  May raise
   * java.lang.IllegalArgumentException if either the String is badly formatted or if this
   * kind of property can't be expressed as text.
   *
   * @param text The string to be parsed.
   */
  public final void setAsText (final String text)
          throws IllegalArgumentException
  {
    try
    {
      final Class c = getClass().getClassLoader().loadClass(text);
      setValue(c.newInstance());
    }
    catch (Exception e)
    {
      throw new IllegalArgumentException("Can't handle " + text);
    }
  }

  /**
   * Gets the property value as text.
   *
   * @return The property value as a human editable string. <p>   Returns null if the
   *         value can't be expressed as an editable string. <p>   If a non-null value is
   *         returned, then the PropertyEditor should be prepared to parse that string
   *         back in setAsText().
   */
  public final String getAsText ()
  {
    if (getValue() == null)
    {
      return null;
    }
    return getValue().getClass().getName();
  }
}