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package de.lmu.ifi.dbs.elki.utilities.pairs;
/*
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 java.util.Comparator;
/**
* Pair storing two doubles.
*
* Since double is a native type, this can't be done via the {@link CPair}
* generic.
*
* @author Erich Schubert
*
* @apiviz.has Comparator
*/
public class DoubleDoublePair implements Comparable<DoubleDoublePair>, PairInterface<Double, Double> {
/**
* first value
*/
public double first;
/**
* second value
*/
public double second;
/**
* Constructor
*
* @param first First value
* @param second Second value
*/
public DoubleDoublePair(double first, double second) {
super();
this.first = first;
this.second = second;
}
/**
* Trivial equals implementation
*
* @param obj Object to compare to
*/
@Override
public boolean equals(Object obj) {
if(this == obj) {
return true;
}
if(obj == null) {
return false;
}
if(getClass() != obj.getClass()) {
return false;
}
DoubleDoublePair other = (DoubleDoublePair) obj;
return (this.first == other.first) && (this.second == other.second);
}
/**
* Trivial hashCode implementation mixing the two integers.
*/
@Override
public final int hashCode() {
// convert to longs
long firsthash = Double.doubleToLongBits(first);
firsthash = firsthash ^ (firsthash >> 32);
long secondhash = Double.doubleToLongBits(second);
secondhash = secondhash ^ (secondhash >> 32);
// primitive hash function mixing the two integers.
// this number does supposedly not have any factors in common with 2^32
return (int) (firsthash * 2654435761L + secondhash);
}
/**
* Implementation of comparable interface, sorting by first then second.
*
* @param other Object to compare to
* @return comparison result
*/
@Override
public int compareTo(DoubleDoublePair other) {
int fdiff = Double.compare(this.first, other.first);
if(fdiff != 0) {
return fdiff;
}
return Double.compare(this.second, other.second);
}
/**
* Implementation of comparableSwapped interface, sorting by second then
* first.
*
* @param other Object to compare to
* @return comparison result
*/
public int compareSwappedTo(DoubleDoublePair other) {
int fdiff = Double.compare(this.second, other.second);
if(fdiff != 0) {
return fdiff;
}
return Double.compare(this.first, other.first);
}
/**
* @deprecated use pair.first to avoid boxing!
*/
@Override
@Deprecated
public final Double getFirst() {
return first;
}
/**
* Set first value
*
* @param first new value
*/
public final void setFirst(double first) {
this.first = first;
}
/**
* @deprecated use pair.first to avoid boxing!
*/
@Override
@Deprecated
public final Double getSecond() {
return second;
}
/**
* Set second value
*
* @param second new value
*/
public final void setSecond(double second) {
this.second = second;
}
@Override
public String toString() {
return "DoubleDoublePair("+first+","+second+")";
}
/**
* Comparator to compare by second component only
*/
public static final Comparator<DoubleDoublePair> BYFIRST_COMPARATOR = new Comparator<DoubleDoublePair>() {
@Override
public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
return Double.compare(o1.first, o2.first);
}
};
/**
* Comparator to compare by second component only
*/
public static final Comparator<DoubleDoublePair> BYSECOND_COMPARATOR = new Comparator<DoubleDoublePair>() {
@Override
public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
return Double.compare(o1.second, o2.second);
}
};
/**
* Comparator to compare by swapped components
*/
public static final Comparator<DoubleDoublePair> SWAPPED_COMPARATOR = new Comparator<DoubleDoublePair>() {
@Override
public int compare(DoubleDoublePair o1, DoubleDoublePair o2) {
return o1.compareSwappedTo(o2);
}
};
}
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