/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2014, 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.process.spatialstatistics;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.process.Process;
import org.geotools.process.ProcessException;
import org.geotools.process.ProcessFactory;
import org.geotools.process.spatialstatistics.core.Params;
import org.geotools.process.spatialstatistics.operations.RandomPointsOperation;
import org.geotools.util.logging.Logging;
import org.opengis.filter.expression.Expression;
import org.opengis.util.ProgressListener;
/**
* Generate random points in a polygon features.
*
* @author Minpa Lee, MangoSystem
*
* @source $URL$
*/
public class RandomPointsPerFeaturesProcess extends AbstractStatisticsProcess {
protected static final Logger LOGGER = Logging.getLogger(RandomPointsPerFeaturesProcess.class);
public RandomPointsPerFeaturesProcess(ProcessFactory factory) {
super(factory);
}
public ProcessFactory getFactory() {
return factory;
}
public static SimpleFeatureCollection process(SimpleFeatureCollection polygonFeatures,
Expression expression, ProgressListener monitor) {
Map<String, Object> map = new HashMap<String, Object>();
map.put(RandomPointsPerFeaturesProcessFactory.polygonFeatures.key, polygonFeatures);
map.put(RandomPointsPerFeaturesProcessFactory.expression.key, expression);
Process process = new RandomPointsPerFeaturesProcess(null);
Map<String, Object> resultMap;
try {
resultMap = process.execute(map, monitor);
return (SimpleFeatureCollection) resultMap
.get(RandomPointsPerFeaturesProcessFactory.RESULT.key);
} catch (ProcessException e) {
LOGGER.log(Level.FINER, e.getMessage(), e);
}
return null;
}
@Override
public Map<String, Object> execute(Map<String, Object> input, ProgressListener monitor)
throws ProcessException {
SimpleFeatureCollection polygonFeatures = (SimpleFeatureCollection) Params.getValue(input,
RandomPointsPerFeaturesProcessFactory.polygonFeatures, null);
Expression expression = (Expression) Params.getValue(input,
RandomPointsPerFeaturesProcessFactory.expression,
RandomPointsPerFeaturesProcessFactory.expression.sample);
if (polygonFeatures == null || expression == null) {
throw new NullPointerException("polygonFeatures, expression parameters required");
}
// start process
SimpleFeatureCollection resultFc = null;
try {
RandomPointsOperation operator = new RandomPointsOperation();
resultFc = operator.executeperFeatures(polygonFeatures, expression);
} catch (IOException e) {
throw new ProcessException(e);
}
// end process
Map<String, Object> resultMap = new HashMap<String, Object>();
resultMap.put(AreaProcessFactory.RESULT.key, resultFc);
return resultMap;
}
}