Refactor SimilarityComparator

source/net/filebot/format/MediaBindingBean.java

@@ -938,13 +938,7 @@ public class MediaBindingBean {
 
 			// still no good match found -> just take the most probable video from the same folder
 			if (videos.size() > 0) {
-				sort(videos, new SimilarityComparator(FileUtilities.getName(getMediaFile())) {
-
-					@Override
-					public int compare(Object o1, Object o2) {
-						return super.compare(FileUtilities.getName((File) o1), FileUtilities.getName((File) o2));
-					}
-				});
+				sort(videos, new SimilarityComparator<File, String>(FileUtilities.getName(getMediaFile()), FileUtilities::getName));
 				return videos.get(0);
 			}
 		}

source/net/filebot/similarity/SimilarityComparator.java

@@ -1,44 +1,46 @@
-
 package net.filebot.similarity;
 
+import static java.util.Collections.*;
 
+import java.util.Collection;
+import java.util.Collections;
 import java.util.Comparator;
+import java.util.function.Function;
 
-
-public class SimilarityComparator implements Comparator<Object> {
+public class SimilarityComparator<T, P> implements Comparator<T> {
 
 	protected SimilarityMetric metric;
-	protected Object[] paragon;
+	protected Collection<P> paragon;
 
+	protected Function<T, Collection<P>> mapper;
 
-	public SimilarityComparator(SimilarityMetric metric, Object[] paragon) {
+	public SimilarityComparator(SimilarityMetric metric, Collection<P> paragon, Function<T, Collection<P>> mapper) {
 		this.metric = metric;
 		this.paragon = paragon;
+		this.mapper = mapper;
 	}
 
-
-	public SimilarityComparator(Object... paragon) {
-		this(new NameSimilarityMetric(), paragon);
+	public SimilarityComparator(P paragon, Function<T, P> mapper) {
+		this(new NameSimilarityMetric(), singleton(paragon), mapper.andThen(Collections::singleton));
 	}
 
-
 	@Override
-	public int compare(Object o1, Object o2) {
-		float f1 = getMaxSimilarity(o1);
-		float f2 = getMaxSimilarity(o2);
-
-		if (f1 == f2)
-			return 0;
-
-		return f1 > f2 ? -1 : 1;
+	public int compare(T o1, T o2) {
+		return Double.compare(getSimilarity(o2), getSimilarity(o1));
 	}
 
+	private static final double ZERO = 0;
 
-	public float getMaxSimilarity(Object obj) {
-		float m = 0;
-		for (Object it : paragon) {
-			m += (it != null) ? metric.getSimilarity(obj, it) : 0;
+	public double getSimilarity(T value) {
+		return paragon.stream().mapToDouble((it) -> accumulateSimilarity(it, value)).average().orElse(ZERO);
+	}
+
+	private double accumulateSimilarity(P paragon, T value) {
+		if (paragon == null) {
+			return ZERO;
 		}
-		return m / paragon.length;
+
+		return mapper.apply(value).stream().mapToDouble((it) -> it == null ? ZERO : (double) metric.getSimilarity(paragon, it)).max().orElse(ZERO);
 	}
+
 }

test/net/filebot/similarity/SimilarityComparatorTest.java

@@ -0,0 +1,49 @@
+package net.filebot.similarity;
+
+import static java.util.Arrays.*;
+import static java.util.Collections.*;
+import static org.junit.Assert.*;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.Test;
+
+public class SimilarityComparatorTest {
+
+	private static List<String> generateWords() {
+		return asList("Hello", "Hallo", "12345", "Holla", "Hey", "0123456789", "Hello World", "Hello Test");
+	}
+
+	private static Map<String, String> generateTranslations() {
+		Map<String, String> m = new HashMap<>();
+		m.put("Hello", "Hello");
+		m.put("Hallo", "Hello");
+		m.put("Holla", "Hello");
+		m.put("Hey", "Hello");
+		return m;
+	}
+
+	@Test
+	public void defaultUsage() {
+		SimilarityComparator<String, String> c = new SimilarityComparator<String, String>("Hello", String::toString);
+
+		List<String> phrases = generateWords();
+		phrases.sort(c);
+
+		assertEquals("[Hello, Hello Test, Hello World, Hallo, 12345, Holla, Hey, 0123456789]", phrases.toString());
+	}
+
+	@Test
+	public void accumulateMapper() {
+		Map<String, String> dict = generateTranslations();
+		SimilarityComparator<String, String> c = new SimilarityComparator<String, String>(new NameSimilarityMetric(), singleton("Hello"), (it) -> asList(it, dict.get(it)));
+
+		List<String> phrases = generateWords();
+		phrases.sort(c);
+
+		assertEquals("[Hello, Hallo, Holla, Hey, Hello Test, Hello World, 12345, 0123456789]", phrases.toString());
+	}
+
+}

test/net/filebot/similarity/SimilarityTestSuite.java

@@ -1,14 +1,11 @@
-
 package net.filebot.similarity;
 
-
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 import org.junit.runners.Suite.SuiteClasses;
 
-
 @RunWith(Suite.class)
-@SuiteClasses( { SeriesNameMatcherTest.class, SeasonEpisodeMatcherTest.class, NameSimilarityMetricTest.class, NumericSimilarityMetricTest.class, SeasonEpisodeMetricTest.class })
+@SuiteClasses({ SeriesNameMatcherTest.class, SeasonEpisodeMatcherTest.class, NameSimilarityMetricTest.class, NumericSimilarityMetricTest.class, SeasonEpisodeMetricTest.class, SimilarityComparatorTest.class })
 public class SimilarityTestSuite {
 
 }