propertyeditorutil.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.
 *
 * ------------------------------
 * PropertyEditorUtil.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: PropertyEditorUtil.java,v 1.2 2004/04/20 18:54:42 taqua Exp $
 *
 * Changes
 * -------------------------
 * 25.10.2003 : Initial version
 *
 */

package org.jfree.designer.propertyeditors;

import java.awt.Color;
import java.awt.geom.Dimension2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.HashMap;

import org.jfree.report.ElementAlignment;
import org.jfree.report.layout.BandLayoutManager;
import org.jfree.report.util.Log;

public final class PropertyEditorUtil
{
  private static PropertyEditorUtil instance;
  private final HashMap propertyEditors;

  private void registerPropertyEditors ()
  {
    Log.info("Registering property editors...");
    PropertyEditorManager.registerEditor(Color.class, ColorPropertyEditor.class);
    PropertyEditorManager.registerEditor(Boolean.class, BooleanPropertyEditor.class);
    PropertyEditorManager.registerEditor(String.class, StringPropertyEditor.class);
    PropertyEditorManager.registerEditor(Integer.class, IntegerPropertyEditor.class);
    PropertyEditorManager.registerEditor
            (ElementAlignment.class, ElementAlignmentPropertyEditor.class);
    PropertyEditorManager.registerEditor
            (BandLayoutManager.class, BandLayoutManagerPropertyEditor.class);
    registerCustomPropertyEditor(Dimension2D.class, Dimension2DPropertyEditor.class);
    registerCustomPropertyEditor(Rectangle2D.class, Rectangle2DPropertyEditor.class);
    registerCustomPropertyEditor(Point2D.class, Point2DPropertyEditor.class);
  }

  private PropertyEditorUtil ()
  {
    propertyEditors = new HashMap();
  }

  private static PropertyEditorUtil getInstance ()
  {
    if (instance == null)
    {
      instance = new PropertyEditorUtil();
      instance.registerPropertyEditors();
    }
    return instance;
  }

  public static void registerCustomPropertyEditor (final Class type, final Class editor)
  {
    if (hasDefaultConstructor(editor) == false)
    {
      throw new IllegalArgumentException
              ("The given property editor has no public default constructor.");
    }
    getInstance().propertyEditors.put(type, editor);
  }

  public static PropertyEditor findPropertyEditor (final Class type)
  {
    final Class editor = findRegisteredEditor(type);
    if (editor != null)
    {
      try
      {
        return (PropertyEditor) editor.newInstance();
      }
      catch (Exception e)
      {
        Log.warn("PropertyEditorUtil: ", e);
      }
    }
    return PropertyEditorManager.findEditor(type);
  }

  private static Class findRegisteredEditor (final Class type)
  {
    final PropertyEditorUtil util = getInstance();
    Class currentSearchType = type;
    while (currentSearchType != null)
    {
      final Class edClass = (Class) util.propertyEditors.get(currentSearchType);
      if (edClass != null)
      {
        return edClass;
      }
      currentSearchType = currentSearchType.getSuperclass();
    }
    return null;
  }

  public static boolean hasDefaultConstructor (final Class type)
  {
    try
    {
      final Constructor con = type.getConstructor(new Class[0]);
      return Modifier.isPublic(con.getModifiers());
    }
    catch (Exception e)
    {
      return false;
    }
  }

}