content: /**
   * ﻿Copyright (C) 2007 - 2019 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;
  
  import java.util.Iterator;
  import java.util.UUID;
  
  import javax.xml.namespace.QName;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.geotools.feature.DefaultFeatureCollections;
  import org.geotools.feature.FeatureCollection;
  import org.n52.wps.io.GTHelper;
  import org.n52.wps.io.SchemaRepository;
  import org.n52.wps.io.data.binding.complex.GTVectorDataBinding;
  import org.opengis.feature.simple.SimpleFeature;
  import org.opengis.feature.simple.SimpleFeatureType;
  import org.opengis.referencing.crs.CoordinateReferenceSystem;
  
  import com.vividsolutions.jts.geom.Geometry;
  
  import org.n52.wps.algorithm.annotation.Algorithm;
  import org.n52.wps.algorithm.annotation.ComplexDataInput;
  import org.n52.wps.algorithm.annotation.ComplexDataOutput;
  import org.n52.wps.algorithm.annotation.LiteralDataInput;
  import org.n52.wps.algorithm.annotation.Execute;
  import org.n52.wps.server.AbstractAnnotatedAlgorithm;
  
  @Algorithm(version = "1.1.0")
  public class SimpleBufferAlgorithm extends AbstractAnnotatedAlgorithm {
  
      private static Logger LOGGER = LoggerFactory.getLogger(SimpleBufferAlgorithm.class);
      private Double percentage;
  
      public SimpleBufferAlgorithm() {
          super();
      }
      
      private FeatureCollection result;
      private FeatureCollection data;
      private double width;
  
      @ComplexDataOutput(identifier = "result", binding = GTVectorDataBinding.class)
      public FeatureCollection getResult() {
          return result;
      }
  
      @ComplexDataInput(identifier = "data", binding = GTVectorDataBinding.class)
      public void setData(FeatureCollection data) {
          this.data = data;
      }
  
      @LiteralDataInput(identifier = "width")
      public void setWidth(double width) {
          this.width = width;
      }
  
      @Execute
      public void runBuffer() {
          //Collection resultColl = new ArrayList();
          double i = 0;
          int totalNumberOfFeatures = data.size();
          String uuid = UUID.randomUUID().toString();
          result = DefaultFeatureCollections.newCollection();
          SimpleFeatureType featureType = null;
          LOGGER.debug("");
          for (Iterator ia = data.iterator(); ia.hasNext();) {
              /**
               * ******* How to publish percentage results ************
               */
              i = i + 1;
              percentage = (i / totalNumberOfFeatures) * 100;
              this.update(new Integer(percentage.intValue()));
  
              /**
               * ******************
               */
              SimpleFeature feature = (SimpleFeature) ia.next();
              Geometry geometry = (Geometry) feature.getDefaultGeometry();
              Geometry geometryBuffered = runBuffer(geometry, width);
  
              if (i == 1) {
                  CoordinateReferenceSystem crs = feature.getFeatureType().getCoordinateReferenceSystem();
                  if (geometry.getUserData() instanceof CoordinateReferenceSystem) {
                      crs = ((CoordinateReferenceSystem) geometry.getUserData());
                  }
                  featureType = GTHelper.createFeatureType(feature.getProperties(), geometryBuffered, uuid, crs);
                  QName qname = GTHelper.createGML3SchemaForFeatureType(featureType);
                  SchemaRepository.registerSchemaLocation(qname.getNamespaceURI(), qname.getLocalPart());
  
              }
  
              if (geometryBuffered != null) {
                  SimpleFeature createdFeature = (SimpleFeature) GTHelper.createFeature("ID" + new Double(i).intValue(), geometryBuffered, (SimpleFeatureType) featureType, feature.getProperties());
                  feature.setDefaultGeometry(geometryBuffered);
                  result.add(createdFeature);
              } else {
                  LOGGER.warn("GeometryCollections are not supported, or result null. Original dataset will be returned");
              }
          }
  
      }
  
      private Geometry runBuffer(Geometry a, double width) {
          Geometry buffered = null;
  
          try {
              buffered = a.buffer(width);
              return buffered;
          } catch (RuntimeException ex) {
              // simply eat exceptions and report them by returning null
          }
          return null;
      }
  }