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package de.lmu.ifi.dbs.elki.distance.distanceresultlist;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
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.ArrayList;
import de.lmu.ifi.dbs.elki.database.ids.DBIDFactory;
import de.lmu.ifi.dbs.elki.database.ids.DBIDIter;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
import de.lmu.ifi.dbs.elki.database.ids.DistanceDBIDPair;
import de.lmu.ifi.dbs.elki.distance.distancevalue.Distance;
/**
* Default class to keep a list of distance-object pairs.
*
* @author Erich Schubert
*
* @param <D> Distance type
*/
public class GenericDistanceDBIDList<D extends Distance<D>> implements ModifiableDistanceDBIDResult<D> {
/**
* Actual storage.
*/
final ArrayList<DistanceDBIDPair<D>> storage;
/**
* Constructor.
*/
public GenericDistanceDBIDList() {
super();
storage = new ArrayList<DistanceDBIDPair<D>>();
}
/**
* Constructor.
*
* @param initialCapacity Capacity
*/
public GenericDistanceDBIDList(int initialCapacity) {
super();
storage = new ArrayList<DistanceDBIDPair<D>>(initialCapacity);
}
@Override
public void add(D dist, DBIDRef id) {
storage.add(DBIDFactory.FACTORY.newDistancePair(dist, id));
}
/**
* Add a prepared pair.
*
* @param pair Pair to add
*/
public void add(DistanceDBIDPair<D> pair) {
storage.add(pair);
}
@Override
public void sort() {
DistanceDBIDResultUtil.sortByDistance(storage);
}
@Override
public int size() {
return storage.size();
}
@Override
public DistanceDBIDPair<D> get(int off) {
return storage.get(off);
}
@Override
public DistanceDBIDResultIter<D> iter() {
return new Iter();
}
@Override
public boolean contains(DBIDRef o) {
for(DBIDIter iter = iter(); iter.valid(); iter.advance()) {
if(DBIDUtil.equal(iter, o)) {
return true;
}
}
return false;
}
@Override
public boolean isEmpty() {
return size() == 0;
}
@Override
public String toString() {
return DistanceDBIDResultUtil.toString(this);
}
/**
* Iterator class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
protected class Iter implements DistanceDBIDResultIter<D> {
/**
* Iterator position.
*/
int pos = 0;
@Override
public int internalGetIndex() {
return get(pos).internalGetIndex();
}
@Override
public boolean valid() {
return pos < size();
}
@Override
public void advance() {
pos++;
}
@Override
public D getDistance() {
return get(pos).getDistance();
}
@Override
public DistanceDBIDPair<D> getDistancePair() {
return get(pos);
}
@Override
public String toString() {
return valid() ? getDistancePair().toString() : "null";
}
}
}
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