package org.opentrafficsim.road;
   
   import java.lang.reflect.Field;
   import java.util.Set;
   
   import org.djutils.reflection.ClassUtil;
   import org.opentrafficsim.base.parameters.ParameterException;
   import org.opentrafficsim.base.parameters.ParameterSet;
   import org.opentrafficsim.base.parameters.ParameterTypeBoolean;
  import org.opentrafficsim.base.parameters.ParameterTypeDouble;
  import org.opentrafficsim.base.parameters.ParameterTypeInteger;
  import org.opentrafficsim.base.parameters.ParameterTypeNumeric;
  import org.opentrafficsim.base.parameters.ParameterTypes;
  
  /**
   * Creator of set of parameters with default values.
   * <p>
   * Copyright (c) 2013-2019 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/docs/current/license.html">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version Apr 15, 2016 <br>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   */
  public final class DefaultTestParameters
  {
  
      /**
       * Do not create instance.
       */
      private DefaultTestParameters()
      {
          // Do not instantiate
      }
  
      /**
       * Returns a default set of parameters.
       * @return Default set of parameters.
       */
      @SuppressWarnings("unchecked")
      public static ParameterSet create()
      {
          ParameterSet params = new ParameterSet();
  
          // set all default values using reflection
          Set<Field> fields = ClassUtil.getAllFields(ParameterTypes.class);
          try
          {
              for (Field field : fields)
              {
                  try
                  {
                      if (ParameterTypeNumeric.class.isAssignableFrom(field.getType()))
                      {
                          field.setAccessible(true);
                          @SuppressWarnings("rawtypes")
                          ParameterTypeNumeric p = (ParameterTypeNumeric) field.get(ParameterTypes.class);
                          params.setParameter(p, p.getDefaultValue());
                      }
                      else if (ParameterTypeBoolean.class.equals(field.getType()))
                      {
                          field.setAccessible(true);
                          ParameterTypeBoolean p = (ParameterTypeBoolean) field.get(ParameterTypes.class);
                          params.setParameter(p, p.getDefaultValue());
                      }
                      else if (ParameterTypeDouble.class.equals(field.getType()))
                      {
                          field.setAccessible(true);
                          ParameterTypeDouble p = (ParameterTypeDouble) field.get(ParameterTypes.class);
                          params.setParameter(p, p.getDefaultValue());
                      }
                      else if (ParameterTypeInteger.class.equals(field.getType()))
                      {
                          field.setAccessible(true);
                          ParameterTypeInteger p = (ParameterTypeInteger) field.get(ParameterTypes.class);
                          params.setParameter(p, p.getDefaultValue());
                      }
                      // FIXME: add another else to catch any unanticipated cases?
                  }
                  catch (ParameterException pe)
                  {
                      // FIXME: Explain why this exception can/should be ignored.
                      // do not set parameter without default value
                  }
              }
          }
          catch (IllegalArgumentException iare)
          {
              iare.printStackTrace();
          }
          catch (IllegalAccessException iace)
          {
              iace.printStackTrace();
          }
          return params;
      }
  
  }