package org.djunits.value.vdouble.scalar.base;
   
   import org.djunits.unit.Unit;
   import org.djunits.value.Relative;
   import org.djunits.value.util.ValueUtil;
   import org.djunits.value.vdouble.scalar.SIScalar;
   
   /**
    * The typed, abstract DoubleScalarRel class that forms the basis of all DoubleScalar definitions and extensions.<br>
   * Note: A relative scalar class can implement the toAbs() method if it has an absolute equivalent.
   * <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://djunits.org/docs/license.html">DJUNITS License</a>.
   * </p>
   * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://www.tudelft.nl/staff/p.knoppers/">Peter Knoppers</a>
   * @param <U> the unit
   * @param <R> the Relative class for reference purposes
   */
  public abstract class DoubleScalarRel<U extends Unit<U>, R extends DoubleScalarRel<U, R>>
          extends DoubleScalar<U, R> implements Relative<U, R>
  {
      /**  */
      private static final long serialVersionUID = 20150626L;
  
      /**
       * Construct a new Relative Immutable DoubleScalar.
       * @param value double; the value of the new Relative Immutable DoubleScalar
       * @param unit U; the unit of the new Relative Immutable DoubleScalar
       */
      public DoubleScalarRel(final double value, final U unit)
      {
          super(unit, unit.isBaseSIUnit() ? value : ValueUtil.expressAsSIUnit(value, unit));
      }
  
      /**
       * Construct a new Relative Immutable DoubleScalar from an existing Relative Immutable DoubleScalar.
       * @param value R, a relative typed DoubleScalar; the reference
       */
      public DoubleScalarRel(final R value)
      {
          super(value.getDisplayUnit(), value.getSI());
      }
  
      /**
       * Construct a new Relative Immutable DoubleScalar of the right type. Each extending class must implement this method.
       * @param value double; the double value
       * @param unit U; the unit
       * @return R a new relative instance of the DoubleScalar of the right type
       */
      public abstract R instantiateRel(double value, U unit);
  
      @Override
      public final R plus(final R increment)
      {
          if (getDisplayUnit().isBaseSIUnit())
          {
              return instantiateRel(this.getSI() + increment.getSI(), getDisplayUnit().getStandardUnit());
          }
          return getDisplayUnit().equals(increment.getDisplayUnit())
                  ? instantiateRel(getInUnit() + increment.getInUnit(), getDisplayUnit())
                  : instantiateRel(this.getSI() + increment.getSI(), getDisplayUnit().getStandardUnit());
      }
  
      @Override
      public final R minus(final R decrement)
      {
          if (getDisplayUnit().isBaseSIUnit())
          {
              return instantiateRel(this.getSI() - decrement.getSI(), getDisplayUnit().getStandardUnit());
          }
          return getDisplayUnit().equals(decrement.getDisplayUnit())
                  ? instantiateRel(getInUnit() - decrement.getInUnit(), getDisplayUnit())
                  : instantiateRel(this.getSI() - decrement.getSI(), getDisplayUnit().getStandardUnit());
      }
  
      /**
       * Multiply this scalar by another scalar and create a new scalar.
       * @param otherScalar DoubleScalarRel&lt;?, ?&gt;; the value by which this scalar is multiplied
       * @return DoubleScalar&lt;?&gt;; a new scalar instance with correct SI dimensions
       */
      public SIScalar times(final DoubleScalarRel<?, ?> otherScalar)
      {
          return DoubleScalar.multiply(this, otherScalar);
      }
  
      /**
       * Create the reciprocal of this scalar with the correct dimensions.
       * @return DoubleScalar&lt;?&gt;; a new scalar instance with correct SI dimensions
       */
      public abstract DoubleScalarRel<?, ?> reciprocal();
  
      /**
       * Divide this scalar by another scalar and create a new scalar.
       * @param otherScalar DoubleScalarRel&lt;?, ?&gt;; the value by which this scalar is divided
       * @return DoubleScalar&lt;?&gt;; a new scalar instance with correct SI dimensions
       */
      public SIScalar divide(final DoubleScalarRel<?, ?> otherScalar)
      {
         return DoubleScalar.divide(this, otherScalar);
     }
 
     /**********************************************************************************/
     /********************************** MATH METHODS **********************************/
     /**********************************************************************************/
 
     @Override
     public R abs()
     {
         return instantiateRel(Math.abs(getInUnit()), getDisplayUnit());
     }
 
     @Override
     public R ceil()
     {
         return instantiateRel(Math.ceil(getInUnit()), getDisplayUnit());
     }
 
     @Override
     public R floor()
     {
         return instantiateRel(Math.floor(getInUnit()), getDisplayUnit());
     }
 
     @Override
     public R rint()
     {
         return instantiateRel(Math.rint(getInUnit()), getDisplayUnit());
     }
 
     @Override
     public R neg()
     {
         return instantiateRel(-getInUnit(), getDisplayUnit());
     }
 
     @Override
     public R times(final double constant)
     {
         return instantiateRel(getInUnit() * constant, getDisplayUnit());
     }
 
     @Override
     public R divide(final double constant)
     {
         return instantiateRel(getInUnit() / constant, getDisplayUnit());
     }
 
     @Override
     public R times(final float constant)
     {
         return instantiateRel(getInUnit() * constant, getDisplayUnit());
     }
 
     @Override
     public R divide(final float constant)
     {
         return instantiateRel(getInUnit() / constant, getDisplayUnit());
     }
 
 }