content: // ===============================================================================
  // Authors: AFRL/RQQD
  // Organization: Air Force Research Laboratory, Aerospace Systems Directorate, Power and Control Division
  // 
  // Copyright (c) 2017 Government of the United State of America, as represented by
  // the Secretary of the Air Force.  No copyright is claimed in the United States under
  // Title 17, U.S. Code.  All Other Rights Reserved.
  // ===============================================================================
  
  /*
   * GRAL: GRAphing Library for Java(R)
   *
   * (C) Copyright 2009-2013 Erich Seifert <dev[at]erichseifert.de>,
   * Michael Seifert <mseifert[at]error-reports.org>
   *
   * This file is part of GRAL.
   *
   * GRAL 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 3 of the License, or
   * (at your option) any later version.
   *
   * GRAL 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 GRAL.  If not, see <http://www.gnu.org/licenses/>.
   */
  package de.erichseifert.gral.util;
  
  import java.awt.BasicStroke;
  import java.awt.Shape;
  import java.awt.geom.Area;
  import java.awt.geom.Point2D;
  import java.io.Serializable;
  
  /**
   * An abstract class containing utility functions for serialization.
   */
  public abstract class SerializationUtils {
  	/**
  	 * Default constructor that prevents creation of class.
  	 */
  	private SerializationUtils() {
  		throw new UnsupportedOperationException();
  	}
  
  	/**
  	 * Makes sure an object is serializable, otherwise a serializable wrapper
  	 * will be returned.
  	 * @param o Object to be serialized.
  	 * @return A serializable object, or a serializable wrapper.
  	 */
  	public static Serializable wrap(Object o) {
  		if (o == null || o instanceof Serializable) {
  			return (Serializable) o;
  		}
  
  		// See Java bug 4305099:
  		// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4305099
  		if (o instanceof BasicStroke) {
  			BasicStroke stroke = (BasicStroke) o;
  			return new SerializableBasicStroke(stroke);
  		}
  
  		// See Java bug 4263142 until Java 1.6:
  		// http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4263142
  		if ((o instanceof Point2D.Double) || (o instanceof Point2D.Float)) {
  			Point2D point = (Point2D) o;
  			return new SerializablePoint2D(point);
  		}
  
  		if (o instanceof Area) {
  			Area area = (Area) o;
  			return new SerializableArea(area);
  		}
  
  		if (o instanceof Shape) {
  			Shape shape = (Shape) o;
  			return new SerializableShape(shape);
  		}
  
  		throw new IllegalArgumentException(String.format(
  			"Failed to make value of type %s serializable.",
  			o.getClass().getName()
  		));
  	}
  
  	/**
  	 * Makes sure a regular object is returned, wrappers for serialization will
  	 * be removed.
  	 * @param o Deserialized object.
  	 * @return A regular (unwrapped) object.
  	 */
  	public static Object unwrap(Serializable o) {
  		if (o instanceof SerializationWrapper<?>) {
  			SerializationWrapper<?> wrapper = (SerializationWrapper<?>) o;
  			return wrapper.unwrap();
  		}
  		return o;
  	}
  }
  