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Diffstat (limited to 'src/de/lmu/ifi/dbs/elki/database/query/DoubleDistanceResultPair.java')
-rw-r--r-- | src/de/lmu/ifi/dbs/elki/database/query/DoubleDistanceResultPair.java | 148 |
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 new file mode 100644 index 00000000..ed0b7599 --- /dev/null +++ b/src/de/lmu/ifi/dbs/elki/database/query/DoubleDistanceResultPair.java @@ -0,0 +1,148 @@ +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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