package org.opentrafficsim.kpi.sampling.data;
   
   import java.util.Arrays;
   
   import org.djunits.unit.Unit;
   import org.djunits.value.ValueException;
   import org.djunits.value.vfloat.scalar.AbstractFloatScalar;
   import org.djunits.value.vfloat.vector.AbstractFloatVector;
   import org.djutils.exceptions.Throw;
  import org.opentrafficsim.kpi.interfaces.GtuDataInterface;
  import org.opentrafficsim.kpi.sampling.SamplingException;
  
  /**
   * Class to facilitate JUNITS types in extended data.
   * <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/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version $Revision$, $LastChangedDate$, by $Author$, initial version 21 mrt. 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 <U> unit
   * @param <T> type in vector
   * @param <O> vector type
   * @param <G> gtu data type
   */
  public abstract class ExtendedDataTypeFloat<U extends Unit<U>, T extends AbstractFloatScalar<U, T>,
          O extends AbstractFloatVector<U, O>, G extends GtuDataInterface> extends ExtendedDataType<T, O, float[], G>
  {
      /**
       * Constructor setting the id.
       * @param id String; id
       */
      public ExtendedDataTypeFloat(final String id)
      {
          super(id);
      }
  
      /** {@inheritDoc} */
      @Override
      public final float[] setValue(final float[] storage, final int i, final T value)
      {
          float[] out;
          if (i == storage.length)
          {
              int cap = (i - 1) + ((i - 1) >> 1);
              out = Arrays.copyOf(storage, cap);
          }
          else
          {
              out = storage;
          }
          out[i] = value.si;
          return out;
      }
  
      /** {@inheritDoc} */
      @Override
      public final float[] initializeStorage()
      {
          return new float[10];
      }
  
      /** {@inheritDoc} */
      @Override
      public final String formatValue(final String format, final T value)
      {
          return String.format(format, value.getSI());
      }
  
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      @Override
      public final T getOutputValue(final O output, final int i) throws SamplingException
      {
          try
          {
              return (T) output.get(i);
          }
          catch (ValueException exception)
          {
              throw new SamplingException("Index out of range.", exception);
          }
      }
  
      /** {@inheritDoc} */
      @Override
      public T getStorageValue(final float[] storage, final int i) throws SamplingException
      {
          Throw.when(i < 0 || i >= storage.length, SamplingException.class, "Index %d out of range.", i);
          return convertValue(storage[i]);
      }
  
      /**
       * Convert float to typed value.
       * @param value float; float value
       * @return typed value
       */
     protected abstract T convertValue(final float value);
 
     /** {@inheritDoc} */
     @Override
     public O convert(final float[] storage, final int size)
     {
         try
         {
             // cut array to size and delegate
             return convert(Arrays.copyOf(storage, size));
         }
         catch (ValueException exception)
         {
             throw new RuntimeException("Could not create typed vector from float array.", exception);
         }
     }
 
     /**
      * Convert float array to typed array.
      * @param storage float[]; float array storage
      * @return typed array
      * @throws ValueException when float array cannot be converted
      */
     protected abstract O convert(final float[] storage) throws ValueException;
 
 }