package org.djutils.metadata;
   
   import java.io.Serializable;
   
   import org.djutils.exceptions.Throw;
   
   /**
    * ObjectDescriptor: wrapper for name, description and class of one object. <br>
    * <br>
   * Copyright (c) 2020-2022 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
   * for project information <a href="https://djutils.org" target="_blank"> https://djutils.org</a>. The DJUTILS project is
   * distributed under a three-clause BSD-style license, which can be found at
   * <a href="https://djutils.org/docs/license.html" target="_blank"> https://djutils.org/docs/license.html</a>. <br>
   * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   */
  public class ObjectDescriptor implements Serializable
  {
      /** ... */
      private static final long serialVersionUID = 20200417L;
  
      /** Name. */
      private final String name;
  
      /** Description. */
      private final String description;
  
      /** Class. */
      private final Class<?> objectClass;
  
      /**
       * Construct a new FieldDescription object.
       * @param name String; name of the object
       * @param description String; description of the object
       * @param objectClass Class&lt;?&gt;; class of the object
       */
      public ObjectDescriptor(final String name, final String description, final Class<?> objectClass)
      {
          Throw.whenNull(name, "name may not be null");
          Throw.when(name.length() == 0, IllegalArgumentException.class, "empty name is not allowed");
          Throw.whenNull(description, "description may not be null");
          Throw.whenNull(objectClass, "objectClass may not be null");
          this.name = name;
          this.description = description;
          this.objectClass = objectClass;
      }
  
      /**
       * Retrieve the name of the object.
       * @return String; description of the object
       */
      String getName()
      {
          return this.name;
      }
  
      /**
       * Retrieve the description of the object.
       * @return String; description of the object
       */
      String getDescription()
      {
          return this.description;
      }
  
      /**
       * Retrieve the Class of the object.
       * @return String; class name of the object
       */
      public Class<?> getObjectClass()
      {
          return this.objectClass;
      }
  
      /** {@inheritDoc} */
      @Override
      public int hashCode()
      {
          final int prime = 31;
          int result = 1;
          result = prime * result + this.description.hashCode();
          result = prime * result + this.name.hashCode();
          result = prime * result + this.objectClass.getName().hashCode();
          return result;
      }
  
      /** {@inheritDoc} */
      @Override
      @SuppressWarnings("checkstyle:needbraces")
      public boolean equals(final Object obj)
      {
          if (this == obj)
              return true;
          if (obj == null)
              return false;
          if (getClass() != obj.getClass())
              return false;
          ObjectDescriptor other = (ObjectDescriptor) obj;
          if (!this.description.equals(other.description))
             return false;
         if (!this.name.equals(other.name))
             return false;
         if (!this.objectClass.equals(other.objectClass))
             return false;
         return true;
     }
 
     /** {@inheritDoc} */
     @Override
     public String toString()
     {
         return "ObjectDescriptor [name=" + this.name + ", description=" + this.description + ", objectClass=" + this.objectClass
                 + "]";
     }
 
 }