Import Upstream version 0.4.0~beta1

1 files changed, 148 insertions, 0 deletions

diff --git a/src/de/lmu/ifi/dbs/elki/database/query/DoubleDistanceResultPair.java b/src/de/lmu/ifi/dbs/elki/database/query/DoubleDistanceResultPair.java
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+++ b/src/de/lmu/ifi/dbs/elki/database/query/DoubleDistanceResultPair.java
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+package de.lmu.ifi.dbs.elki.database.query;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+Ludwig-Maximilians-Universität München
+Lehr- und Forschungseinheit für Datenbanksysteme
+ELKI Development Team
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import de.lmu.ifi.dbs.elki.database.ids.DBID;
+import de.lmu.ifi.dbs.elki.distance.distancevalue.DoubleDistance;
+
+/**
+ * Optimized DistanceResultPair that avoids/postpones an extra layer of boxing
+ * for double values.
+ * 
+ * @author Erich Schubert
+ */
+public class DoubleDistanceResultPair implements DistanceResultPair<DoubleDistance> {
+  /**
+   * Distance value
+   */
+  double distance;
+
+  /**
+   * Object ID
+   */
+  DBID id;
+
+  /**
+   * Constructor.
+   * 
+   * @param distance Distance value
+   * @param id Object ID
+   */
+  public DoubleDistanceResultPair(double distance, DBID id) {
+    super();
+    this.distance = distance;
+    this.id = id;
+  }
+
+  @Override
+  public DoubleDistance getDistance() {
+    return new DoubleDistance(distance);
+  }
+
+  @Override
+  public void setDistance(DoubleDistance distance) {
+    this.distance = distance.doubleValue();
+  }
+
+  @Override
+  public DBID getDBID() {
+    return id;
+  }
+
+  @Override
+  public void setID(DBID id) {
+    this.id = id;
+  }
+
+  /**
+   * @deprecated Use {@link #getDoubleDistance} or {@link #getDistance} for clearness.
+   */
+  @Deprecated
+  @Override
+  public DoubleDistance getFirst() {
+    return getDistance();
+  }
+
+  /**
+   * @deprecated Use {@link #getDBID} for clearness.
+   */
+  @Deprecated
+  @Override
+  public DBID getSecond() {
+    return id;
+  }
+
+  @Override
+  public int compareByDistance(DistanceResultPair<DoubleDistance> o) {
+    if(o instanceof DoubleDistanceResultPair) {
+      DoubleDistanceResultPair od = (DoubleDistanceResultPair) o;
+      final int delta = Double.compare(distance, od.distance);
+      if(delta != 0) {
+        return delta;
+      }
+    }
+    else {
+      final int delta = Double.compare(distance, o.getDistance().doubleValue());
+      if(delta != 0) {
+        return delta;
+      }
+    }
+    return 0;
+  }
+
+  @Override
+  public int compareTo(DistanceResultPair<DoubleDistance> o) {
+    final int delta = this.compareByDistance(o);
+    if(delta != 0) {
+      return delta;
+    }
+    return id.compareTo(o.getDBID());
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if(!(obj instanceof DistanceResultPair)) {
+      return false;
+    }
+    if(obj instanceof DoubleDistanceResultPair) {
+      DoubleDistanceResultPair ddrp = (DoubleDistanceResultPair) obj;
+      return distance == ddrp.distance && id.equals(ddrp.id);
+    }
+    DistanceResultPair<?> other = (DistanceResultPair<?>) obj;
+    return other.getDistance().equals(distance) && id.equals(other.getDBID());
+  }
+
+  /**
+   * Get the distance as double value.
+   * 
+   * @return distance value
+   */
+  public double getDoubleDistance() {
+    return distance;
+  }
+
+  @Override
+  public String toString() {
+    return "DistanceResultPair(" + distance + ", " + id + ")";
+  }
+}
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