/**
* Copyright (C) 2007 - 2016 52°North Initiative for Geospatial Open Source
* Software GmbH
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* If the program is linked with libraries which are licensed under one of
* the following licenses, the combination of the program with the linked
* library is not considered a "derivative work" of the program:
*
* • Apache License, version 2.0
* • Apache Software License, version 1.0
* • GNU Lesser General Public License, version 3
* • Mozilla Public License, versions 1.0, 1.1 and 2.0
* • Common Development and Distribution License (CDDL), version 1.0
*
* Therefore the distribution of the program linked with libraries licensed
* under the aforementioned licenses, is permitted by the copyright holders
* if the distribution is compliant with both the GNU General Public
* License version 2 and the aforementioned licenses.
*
* As an exception to the terms of the GPL, you may copy, modify,
* propagate, and distribute a work formed by combining 52°North WPS
* GeoTools Modules with the Eclipse Libraries, or a work derivative of
* such a combination, even if such copying, modification, propagation, or
* distribution would otherwise violate the terms of the GPL. Nothing in
* this exception exempts you from complying with the GPL in all respects
* for all of the code used other than the Eclipse Libraries. You may
* include this exception and its grant of permissions when you distribute
* 52°North WPS GeoTools Modules. Inclusion of this notice with such a
* distribution constitutes a grant of such permissions. If you do not wish
* to grant these permissions, remove this paragraph from your
* distribution. "52°North WPS GeoTools Modules" means the 52°North WPS
* modules using GeoTools functionality - software licensed under version 2
* or any later version of the GPL, or a work based on such software and
* licensed under the GPL. "Eclipse Libraries" means Eclipse Modeling
* Framework Project and XML Schema Definition software distributed by the
* Eclipse Foundation and licensed under the Eclipse Public License Version
* 1.0 ("EPL"), or a work based on such software and licensed under the EPL.
*
* 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 General
* Public License for more details.
*/
package org.n52.wps.server.algorithm.convexhull;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.geotools.feature.DefaultFeatureCollections;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.n52.wps.io.GTHelper;
import org.n52.wps.io.data.IData;
import org.n52.wps.io.data.binding.complex.GTVectorDataBinding;
import org.n52.wps.server.AbstractSelfDescribingAlgorithm;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import com.vividsolutions.jts.algorithm.ConvexHull;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
/**
* @author Benjamin Pross (bpross-52n)
*
*/
public class ConvexHullAlgorithm extends AbstractSelfDescribingAlgorithm {
Logger LOGGER = LoggerFactory.getLogger(ConvexHullAlgorithm.class);
private List<String> errors = new ArrayList<String>();
public List<String> getErrors() {
return errors;
}
public Class getInputDataType(String id) {
if (id.equalsIgnoreCase("FEATURES")) {
return GTVectorDataBinding.class;
}
return null;
}
public Class getOutputDataType(String id) {
return GTVectorDataBinding.class;
}
public Map<String, IData> run(Map<String, List<IData>> inputData) {
if (inputData == null || !inputData.containsKey("FEATURES")) {
throw new RuntimeException(
"Error while allocating input parameters");
}
List<IData> dataList = inputData.get("FEATURES");
if (dataList == null || dataList.size() != 1) {
throw new RuntimeException(
"Error while allocating input parameters");
}
IData firstInputData = dataList.get(0);
FeatureCollection featureCollection = ((GTVectorDataBinding) firstInputData)
.getPayload();
FeatureIterator iter = featureCollection.features();
List<Coordinate> coordinateList = new ArrayList<Coordinate>();
int counter = 0;
Geometry unifiedGeometry = null;
while (iter.hasNext()) {
SimpleFeature feature = (SimpleFeature) iter.next();
if (feature.getDefaultGeometry() == null) {
throw new NullPointerException(
"defaultGeometry is null in feature id: "
+ feature.getID());
}
Geometry geom = (Geometry) feature.getDefaultGeometry();
Coordinate[] coordinateArray = geom.getCoordinates();
for(Coordinate coordinate : coordinateArray){
coordinateList.add(coordinate);
}
}
Coordinate[] coordinateArray = new Coordinate[coordinateList.size()];
for(int i = 0; i<coordinateList.size(); i++){
coordinateArray[i] = coordinateList.get(i);
}
ConvexHull convexHull = new ConvexHull(coordinateArray, new GeometryFactory());
Geometry out = convexHull.getConvexHull();
Feature feature = createFeature(out, featureCollection.getSchema().getCoordinateReferenceSystem());
FeatureCollection fOut = DefaultFeatureCollections.newCollection();
fOut.add(feature);
HashMap<String, IData> result = new HashMap<String, IData>();
result.put("RESULT",
new GTVectorDataBinding(fOut));
return result;
}
private Feature createFeature(Geometry geometry, CoordinateReferenceSystem crs) {
String uuid = UUID.randomUUID().toString();
SimpleFeatureType featureType = GTHelper.createFeatureType(geometry, uuid, crs);
GTHelper.createGML3SchemaForFeatureType(featureType);
Feature feature = GTHelper.createFeature("0", geometry, featureType);
return feature;
}
@Override
public List<String> getInputIdentifiers() {
List<String> identifierList = new ArrayList<String>();
identifierList.add("FEATURES");
return identifierList;
}
@Override
public List<String> getOutputIdentifiers() {
List<String> identifierList = new ArrayList<String>();
identifierList.add("RESULT");
return identifierList;
}
}