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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) 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.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.index.tree.AbstractLeafEntry;
/**
* Represents an entry in a leaf node of a spatial index. A SpatialLeafEntry
* consists of an id (representing the unique id of the underlying data object)
* and the values of the underlying data object.
*
* @author Elke Achtert
*/
public class SpatialPointLeafEntry extends AbstractLeafEntry implements SpatialEntry {
private static final long serialVersionUID = 1;
/**
* The values of the underlying data object.
*/
private double[] values;
/**
* Empty constructor for serialization purposes.
*/
public SpatialPointLeafEntry() {
super();
}
/**
* Constructs a new LeafEntry object with the given parameters.
*
* @param id the unique id of the underlying data object
* @param values the values of the underlying data object
*/
public SpatialPointLeafEntry(DBID id, double[] values) {
super(id);
this.values = values;
}
/**
* Constructor from number vector
*
* @param id Object id
* @param vector Number vector
*/
public SpatialPointLeafEntry(DBID id, NumberVector<?, ?> vector) {
super(id);
int dim = vector.getDimensionality();
this.values = new double[dim];
for(int i = 0; i < dim; i++) {
values[i] = vector.doubleValue(i + 1);
}
}
@Override
public int getDimensionality() {
return values.length;
}
/**
* @return the value at the specified dimension
*/
@Override
public double getMin(int dimension) {
return values[dimension - 1];
}
/**
* @return the value at the specified dimension
*/
@Override
public double getMax(int dimension) {
return values[dimension - 1];
}
/**
* Returns the values of the underlying data object of this entry.
*
* @return the values of the underlying data object of this entry
*/
public double[] getValues() {
return values;
}
/**
* Calls the super method and writes the values 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.writeInt(values.length);
for(double v : values) {
out.writeDouble(v);
}
}
/**
* Calls the super method and reads the values 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);
values = new double[in.readInt()];
for(int d = 0; d < values.length; d++) {
values[d] = in.readDouble();
}
}
}
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