1 files changed, 37 insertions, 5 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/distance/distancefunction/ArcCosineDistanceFunction.java b/src/de/lmu/ifi/dbs/elki/distance/distancefunction/ArcCosineDistanceFunction.java
index fd19bfef..03563c6f 100644
--- a/src/de/lmu/ifi/dbs/elki/distance/distancefunction/ArcCosineDistanceFunction.java
+++ b/src/de/lmu/ifi/dbs/elki/distance/distancefunction/ArcCosineDistanceFunction.java
@@ -4,7 +4,7 @@ package de.lmu.ifi.dbs.elki.distance.distancefunction;
  This file is part of ELKI:
  Environment for Developing KDD-Applications Supported by Index-Structures
 
- Copyright (C) 2011
+ Copyright (C) 2012
  Ludwig-Maximilians-Universität München
  Lehr- und Forschungseinheit für Datenbanksysteme
  ELKI Development Team
@@ -24,6 +24,14 @@ package de.lmu.ifi.dbs.elki.distance.distancefunction;
  */
 
 import de.lmu.ifi.dbs.elki.data.NumberVector;
+import de.lmu.ifi.dbs.elki.data.VectorUtil;
+import de.lmu.ifi.dbs.elki.data.spatial.SpatialComparable;
+import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
+import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
+import de.lmu.ifi.dbs.elki.database.query.distance.SpatialDistanceQuery;
+import de.lmu.ifi.dbs.elki.database.query.distance.SpatialPrimitiveDistanceQuery;
+import de.lmu.ifi.dbs.elki.database.relation.Relation;
+import de.lmu.ifi.dbs.elki.distance.distancevalue.DoubleDistance;
 import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
 
 /**
@@ -34,12 +42,12 @@ import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
  * 
  * @author Arthur Zimek
  */
-public class ArcCosineDistanceFunction extends AbstractCosineDistanceFunction {
+public class ArcCosineDistanceFunction extends AbstractVectorDoubleDistanceFunction implements SpatialPrimitiveDoubleDistanceFunction<NumberVector<?, ?>> {
   /**
    * Static instance
    */
   public static final ArcCosineDistanceFunction STATIC = new ArcCosineDistanceFunction();
-  
+
   /**
    * Provides a CosineDistanceFunction.
    * 
@@ -61,8 +69,8 @@ public class ArcCosineDistanceFunction extends AbstractCosineDistanceFunction {
    * @return the cosine distance for two given feature vectors v1 and v2
    */
   @Override
-  public double doubleDistance(NumberVector<?,?> v1, NumberVector<?,?> v2) {
-    double d = Math.acos(angle(v1, v2));
+  public double doubleDistance(NumberVector<?, ?> v1, NumberVector<?, ?> v2) {
+    double d = Math.acos(VectorUtil.cosAngle(v1, v2));
     if(d < 0) {
       d = 0;
     }
@@ -70,6 +78,20 @@ public class ArcCosineDistanceFunction extends AbstractCosineDistanceFunction {
   }
 
   @Override
+  public double doubleMinDist(SpatialComparable mbr1, SpatialComparable mbr2) {
+    double d = Math.acos(VectorUtil.minCosAngle(mbr1, mbr2));
+    if(d < 0) {
+      d = 0;
+    }
+    return d;
+  }
+
+  @Override
+  public DoubleDistance minDist(SpatialComparable mbr1, SpatialComparable mbr2) {
+    return new DoubleDistance(doubleMinDist(mbr1, mbr2));
+  }
+
+  @Override
   public String toString() {
     return "ArcCosineDistance";
   }
@@ -85,6 +107,16 @@ public class ArcCosineDistanceFunction extends AbstractCosineDistanceFunction {
     return this.getClass().equals(obj.getClass());
   }
 
+  @Override
+  public <T extends NumberVector<?, ?>> SpatialDistanceQuery<T, DoubleDistance> instantiate(Relation<T> relation) {
+    return new SpatialPrimitiveDistanceQuery<T, DoubleDistance>(relation, this);
+  }
+
+  @Override
+  public SimpleTypeInformation<? super NumberVector<?, ?>> getInputTypeRestriction() {
+    return TypeUtil.NUMBER_VECTOR_VARIABLE_LENGTH;
+  }
+
   /**
    * Parameterization class.
    *