package org.opentrafficsim.road.od;
   
   import java.util.ArrayList;
   import java.util.List;
   
   import org.djutils.base.Identifiable;
   import org.djutils.exceptions.Throw;
   
   /**
   * A categorization determines for what part of traffic certain demand data is applicable. By default, this is always for a
   * given origin-destination pair and time period. A categorization adds to this additional segregation. For example, per lane,
   * per vehicle class, etc.
   * <p>
   * Copyright (c) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://github.com/peter-knoppers">Peter Knoppers</a>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   */
  public class Categorization implements Identifiable
  {
  
      /** Empty categorization. */
      public static final Categorization UNCATEGORIZED = new Categorization("Uncategorized");
  
      /** Id. */
      private final String id;
  
      /** Set of categorization classes. */
      private final List<Class<?>> classes = new ArrayList<>();
  
      /**
       * @param id id
       */
      private Categorization(final String id)
      {
          Throw.whenNull(id, "Id may not be null.");
          this.id = id;
      }
  
      /**
       * Constructor.
       * @param id Id
       * @param class1 1st class
       * @param classes other classes
       * @throws IllegalArgumentException if any class is given multiple times
       * @throws NullPointerException if any input is null
       */
      public Categorization(final String id, final Class<?> class1, final Class<?>... classes)
      {
          this(id);
          Throw.whenNull(class1, "Classes may not be null.");
          this.classes.add(class1);
          for (Class<?> clazz : classes)
          {
              Throw.whenNull(clazz, "Classes may not be null.");
              Throw.when(this.classes.contains(clazz), IllegalArgumentException.class, "Class %s is given multiple times.",
                      clazz);
              this.classes.add(clazz);
          }
      }
  
      /**
       * Returns the number of category classes defined.
       * @return number of category classes defined
       */
      public final int size()
      {
          return this.classes.size();
      }
  
      /**
       * Returns the i'th class.
       * @param i index of the class
       * @return the i'th class
       * @throws IndexOutOfBoundsException if index i is out of bounds
       */
      public final Class<?> get(final int i)
      {
          Throw.when(i < 0 || i >= size(), IndexOutOfBoundsException.class,
                  "Index %d is out of range for categorization of size %d.", i, size());
          return this.classes.get(i);
      }
  
      /**
       * @return id.
       */
      @Override
      public final String getId()
      {
          return this.id;
      }
  
      /**
       * Returns whether the categorization contains a class that is, or is a sub type of, the given class.
       * @param clazz class to check
       * @return whether the categorization contains a class that is, or is a sub type of, the given class
       */
     public final boolean entails(final Class<?> clazz)
     {
         for (Class<?> clazz2 : this.classes)
         {
             if (clazz.isAssignableFrom(clazz2))
             {
                 return true;
             }
         }
         return false;
     }
 
     @Override
     public final int hashCode()
     {
         final int prime = 31;
         int result = 1;
         result = prime * result + ((this.classes == null) ? 0 : this.classes.hashCode());
         return result;
     }
 
     @Override
     public final boolean equals(final Object obj)
     {
         if (this == obj)
         {
             return true;
         }
         if (obj == null)
         {
             return false;
         }
         if (getClass() != obj.getClass())
         {
             return false;
         }
         Categorization other = (Categorization) obj;
         if (this.classes == null)
         {
             if (other.classes != null)
             {
                 return false;
             }
         }
         else if (!this.classes.equals(other.classes))
         {
             return false;
         }
         return true;
     }
 
     @Override
     public final String toString()
     {
         return "Categorization [id=" + this.id + ", classes=" + this.classes + "]";
     }
 
 }