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package de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.rdknn;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
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.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import de.lmu.ifi.dbs.elki.data.ModifiableHyperBoundingBox;
import de.lmu.ifi.dbs.elki.index.tree.spatial.SpatialDirectoryEntry;
/**
* Represents an entry in a directory node of an RdKNN-Tree. Additionally to a
* SpatialDirectoryEntry a RdKNNDirectoryEntry holds the knn distance of the
* underlying RdKNN-Tree node.
*
* @author Elke Achtert
* @since 0.2
* @param Distance type
*/
public class RdKNNDirectoryEntry extends SpatialDirectoryEntry implements RdKNNEntry {
private static final long serialVersionUID = 2;
/**
* The aggregated knn distance of this entry.
*/
private double knnDistance;
/**
* Empty constructor for serialization purposes.
*/
public RdKNNDirectoryEntry() {
// empty constructor
}
/**
* Constructs a new RDkNNDirectoryEntry object with the given parameters.
*
* @param id the unique id of the underlying node
* @param mbr the minimum bounding rectangle of the underlying node
* @param knnDistance the aggregated knn distance of this entry
*/
public RdKNNDirectoryEntry(int id, ModifiableHyperBoundingBox mbr, double knnDistance) {
super(id, mbr);
this.knnDistance = knnDistance;
}
@Override
public double getKnnDistance() {
return knnDistance;
}
@Override
public void setKnnDistance(double knnDistance) {
this.knnDistance = knnDistance;
}
/**
* Calls the super method and writes the knn distance of this entry to the
* specified stream.
*
* @param out the stream to write the object to
* @throws java.io.IOException Includes any I/O exceptions that may occur
*/
@Override
public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal(out);
out.writeDouble(knnDistance);
}
/**
* Calls the super method and reads the knn distance of this entry from the
* specified input stream.
*
* @param in the stream to read data from in order to restore the object
* @throws java.io.IOException if I/O errors occur
* @throws ClassNotFoundException If the class for an object being restored
* cannot be found.
*/
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
super.readExternal(in);
this.knnDistance = in.readDouble();
}
/**
* Indicates whether some other object is "equal to" this one.
*
* @param o the object to be tested
* @return true, if the super method returns true and o is an
* RDkNNDirectoryEntry and has the same knnDistance as this entry.
*/
@Override
public boolean equals(Object o) {
if(this == o) {
return true;
}
if(o == null || getClass() != o.getClass()) {
return false;
}
if(!super.equals(o)) {
return false;
}
final RdKNNDirectoryEntry that = (RdKNNDirectoryEntry) o;
return knnDistance == that.knnDistance;
}
}
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