package org.opentrafficsim.base.parameters.constraint;
   
   import java.util.Collection;
   import java.util.LinkedHashSet;
   
   import org.djutils.exceptions.Throw;
   
   /**
    * Constraint that checks whether a value is in a given constraint collection.
   * <p>
   * Copyright (c) 2013-2022 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version 10 sep. 2017 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   * @param <T> value type
   */
  public class CollectionConstraint<T> implements Constraint<T>
  {
  
      /** Acceptable objects. */
      @SuppressWarnings("checkstyle:visibilitymodifier")
      protected final Collection<T> objects;
  
      /**
       * @param objects Collection&lt;T&gt;; acceptable objects
       */
      public CollectionConstraint(final Collection<T> objects)
      {
          Throw.whenNull(objects, "Collection of acceptable objects may not be null.");
          this.objects = objects;
      }
  
      /** {@inheritDoc} */
      @Override
      @SuppressWarnings("checkstyle:designforextension")
      public boolean accept(final T value)
      {
          return this.objects.contains(value);
      }
  
      /** {@inheritDoc} */
      @Override
      @SuppressWarnings("checkstyle:designforextension")
      public String failMessage()
      {
          return "Value of parameter '%s' is not in the collection of acceptable values.";
      }
  
      /**
       * Creates a new instance with given objects.
       * @param objs T...; acceptable objects
       * @param <T> type
       * @return new instance with given objects
       */
      @SafeVarargs
      public static <T> CollectionConstraint<T> newInstance(final T... objs)
      {
          Collection<T> collection = new LinkedHashSet<>();
          for (T t : objs)
          {
              collection.add(t);
          }
          return new CollectionConstraint<>(collection);
      }
  
      /** {@inheritDoc} */
      @Override
      @SuppressWarnings("checkstyle:designforextension")
      public String toString()
      {
          return "CollectionConstraint [objects=" + this.objects + "]";
      }
  
  }