LightJason - AgentSpeak(L++)
consistency/metric/CSymmetricDifference.java
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23 
24 package org.lightjason.agentspeak.consistency.metric;
25 
27 
28 import java.util.Collection;
29 import java.util.HashSet;
30 import java.util.stream.Collectors;
31 import java.util.stream.Stream;
32 
33 
39 public final class CSymmetricDifference implements IMetric
40 {
41 
42  @Override
43  public final Double apply( final Stream<? extends ITerm> p_first, final Stream<? extends ITerm> p_second )
44  {
45  final Collection<ITerm> l_first = p_first.collect( Collectors.toCollection( HashSet<ITerm>::new ) );
46  final Collection<ITerm> l_second = p_second.collect( Collectors.toCollection( HashSet<ITerm>::new ) );
47 
48  return (double) Stream.concat( l_first.stream(), l_second.stream() )
49  .sorted()
50  .distinct()
51  .parallel()
52  .filter( i -> !( l_first.contains( i ) && ( l_second.contains( i ) ) ) )
53  .count();
54  }
55 
56 }
metric interface of the coherency structure
Definition: IMetric.java:37
final Double apply(final Stream<? extends ITerm > p_first, final Stream<? extends ITerm > p_second)
metric on collections returns the size of symmetric difference