/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2007-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.caching.grid.featurecache;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.geotools.caching.util.CacheUtil;
import org.geotools.caching.util.Generator;
import org.geotools.feature.DefaultFeatureCollection;
import org.geotools.filter.FilterFactoryImpl;
import org.geotools.filter.spatial.BBOXImpl;
import org.opengis.filter.Filter;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
/**
* Data Utilities for Caching.
*
*
*
* @source $URL$
*/
public class DataUtilities {
static FilterFactoryImpl ff = new FilterFactoryImpl();
public static DefaultFeatureCollection createUnitsquareDataSet(int numdata) {
Generator gen = new Generator(1, 1);
DefaultFeatureCollection dataset = new DefaultFeatureCollection("Test", Generator.type);
for (int i = 0; i < numdata; i++) {
dataset.add(gen.createFeature(i));
}
return dataset;
}
public static DefaultFeatureCollection createUnitsquareDataSet(int numdata, long seed) {
Generator gen = new Generator(1, 1, seed);
DefaultFeatureCollection dataset = new DefaultFeatureCollection("Test", Generator.type);
for (int i = 0; i < numdata; i++) {
dataset.add(gen.createFeature(i));
}
return dataset;
}
public static ArrayList<Filter> createUnitsquareFilterSet(int numfilters, double[] windows) {
ArrayList<Filter> filterset = new ArrayList<Filter>(numfilters);
//Coordinate p = Generator.pickRandomPoint(new Coordinate(0.5, 0.5), .950, .950);
Coordinate p = new Coordinate(0.5, 0.5);
for (int i = 0; i < numfilters; i += windows.length) {
for (int j = 0; j < windows.length; j++) {
filterset.add(Generator.createBboxFilter(p, windows[j], windows[j]));
p = Generator.pickRandomPoint(p, windows[j], windows[j]);
}
}
return filterset;
}
public static Filter convert(Envelope e) {
return ff.bbox("", e.getMinX(), e.getMinY(), e.getMaxX(), e.getMaxY(), "");
}
public static void saveFilters(List<Filter> filterset, File f)
throws Exception {
FileOutputStream fos = new FileOutputStream(f);
ObjectOutputStream oos = new ObjectOutputStream(fos);
dumpFilterSet(oos, filterset);
oos.close();
fos.close();
}
public static List<Filter> loadFilters(File f) throws Exception {
System.out.println("Loading existing filters.");
FileInputStream fis = new FileInputStream(f);
ObjectInputStream ois = new ObjectInputStream(fis);
int n = ois.readInt();
List<Filter> filterset = new ArrayList<Filter>();
for (int i = 0; i < n; i++) {
Envelope e = (Envelope) ois.readObject();
filterset.add(DataUtilities.convert(e));
}
ois.close();
fis.close();
return filterset;
}
public static void dumpFilterSet(ObjectOutputStream oos, List<Filter> filterset)
throws Exception {
oos.writeInt(filterset.size());
for (Iterator<Filter> it = filterset.iterator(); it.hasNext();) {
Envelope e = CacheUtil.extractEnvelope((BBOXImpl) it.next());
oos.writeObject(e);
}
}
}