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package de.lmu.ifi.dbs.elki.index.tree.spatial;
/*
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.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import de.lmu.ifi.dbs.elki.data.HyperBoundingBox;
import de.lmu.ifi.dbs.elki.index.tree.AbstractDirectoryEntry;
/**
* Represents an entry in a directory node of a spatial index.
*
* A SpatialDirectoryEntry consists of an id (representing the unique id of the
* underlying spatial node) and the minimum bounding rectangle of the underlying
* spatial node.
*
* @author Elke Achtert
*/
public class SpatialDirectoryEntry extends AbstractDirectoryEntry implements SpatialEntry {
private static final long serialVersionUID = 1;
/**
* The minimum bounding rectangle of the underlying spatial node.
*/
private HyperBoundingBox mbr;
/**
* Empty constructor for serialization purposes.
*/
public SpatialDirectoryEntry() {
// empty constructor
}
/**
* Constructs a new SpatialDirectoryEntry object with the given parameters.
*
* @param id the unique id of the underlying spatial node
* @param mbr the minimum bounding rectangle of the underlying spatial node
*/
public SpatialDirectoryEntry(int id, HyperBoundingBox mbr) {
super(id);
this.mbr = mbr;
}
@Override
public int getDimensionality() {
return mbr.getDimensionality();
}
/**
* @return the coordinate at the specified dimension of the minimum hyper
* point of the MBR of the underlying node
*/
@Override
public double getMin(int dimension) {
return mbr.getMin(dimension);
}
/**
* @return the coordinate at the specified dimension of the maximum hyper
* point of the MBR of the underlying node
*/
@Override
public double getMax(int dimension) {
return mbr.getMax(dimension);
}
/**
* Sets the MBR of this entry.
*
* @param mbr the MBR to be set
*/
public void setMBR(HyperBoundingBox mbr) {
this.mbr = mbr;
}
/**
* Calls the super method and writes the MBR object of this entry to the
* specified output 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);
mbr.writeExternal(out);
}
/**
* Calls the super method and reads the MBR object 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.mbr = new HyperBoundingBox();
this.mbr.readExternal(in);
}
}
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