/* XXL: The eXtensible and fleXible Library for data processing Copyright (C) 2000-2013 Prof. Dr. Bernhard Seeger Head of the Database Research Group Department of Mathematics and Computer Science University of Marburg Germany This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; If not, see <http://www.gnu.org/licenses/>. http://code.google.com/p/xxl/ */ package xxl.core.spatial.histograms.utils; import java.io.IOException; import java.util.List; import java.util.Properties; import xxl.core.cursors.Cursor; import xxl.core.spatial.rectangles.DoublePointRectangle; /** * * This is a simple interface for spatial histograms. * Histogram buckets are represented using WeightedDoublePointRectangle. * */ public interface MHistogram { /** * computes spatial selectivity */ public double getSelectivity(DoublePointRectangle queryRec); /** * builds histogram * @param rectangles * @param numberOfBuckets * @param props */ public void buildHistogram(Cursor<DoublePointRectangle> rectangles, int numberOfBuckets, Properties props) throws IOException; /** * * @return number of buckets in this histogram */ public int numberOfBuckets(); /** * * @return a list of {@link SpatialHistogramBucket} */ public List<SpatialHistogramBucket> getBuckets(); }