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package de.lmu.ifi.dbs.elki.data.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.util.Collection;
import java.util.Collections;
import java.util.Iterator;
/**
* Object representation consisting of (multiple) polygons.
*
* @author Erich Schubert
*
* @apiviz.has Polygon
*/
public class PolygonsObject implements SpatialComparable {
/**
* Static (empty) prototype
*/
public static final PolygonsObject PROTOTYPE = new PolygonsObject(null);
/**
* The polygons
*/
private Collection<Polygon> polygons;
/**
* Constructor.
*
* @param polygons Polygons
*/
public PolygonsObject(Collection<Polygon> polygons) {
super();
this.polygons = polygons;
if(this.polygons == null) {
this.polygons = Collections.emptyList();
}
}
/**
* Access the polygon data.
*
* @return Polygon collection
*/
public Collection<Polygon> getPolygons() {
return Collections.unmodifiableCollection(polygons);
}
@Override
public String toString() {
StringBuffer buf = new StringBuffer();
appendToBuffer(buf);
return buf.toString();
}
/**
* Append polygons to the buffer.
*
* @param buf Buffer to append to
*/
public void appendToBuffer(StringBuffer buf) {
Iterator<Polygon> iter = polygons.iterator();
while(iter.hasNext()) {
Polygon poly = iter.next();
poly.appendToBuffer(buf);
if(iter.hasNext()) {
buf.append(" -- ");
}
}
}
@Override
public int getDimensionality() {
assert (polygons.size() > 0);
return polygons.iterator().next().getDimensionality();
}
@Override
public double getMin(int dimension) {
double min = Double.MAX_VALUE;
for(Polygon p : polygons) {
min = Math.min(min, p.getMin(dimension));
}
return min;
}
@Override
public double getMax(int dimension) {
double max = Double.MIN_VALUE;
for(Polygon p : polygons) {
max = Math.max(max, p.getMin(dimension));
}
return max;
}
}
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