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.io.datahandler.generator;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.UUID;
  
  import javax.xml.namespace.QName;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.geotools.data.collection.ListFeatureCollection;
  import org.geotools.data.simple.SimpleFeatureCollection;
  import org.geotools.feature.FeatureCollection;
  import org.geotools.feature.FeatureIterator;
  import org.geotools.gml2.SrsSyntax;
  import org.geotools.gml3.ApplicationSchemaConfiguration;
  import org.geotools.gml3.GMLConfiguration;
  import org.geotools.xml.Configuration;
  import org.n52.wps.PropertyDocument.Property;
  import org.n52.wps.commons.WPSConfig;
  import org.n52.wps.io.GTHelper;
  import org.n52.wps.io.SchemaRepository;
  import org.n52.wps.io.data.IData;
  import org.n52.wps.io.data.binding.complex.GTVectorDataBinding;
  import org.opengis.feature.simple.SimpleFeature;
  import org.opengis.feature.simple.SimpleFeatureType;
  import org.opengis.feature.type.FeatureType;
  
  import com.vividsolutions.jts.geom.Geometry;
  
  public class GML3BasicGenerator extends AbstractGenerator {
  	
  	private static Logger LOGGER = LoggerFactory.getLogger(GML3BasicGenerator.class);
  	
  	private SrsSyntax srsSyntax = null;
  	
  	public GML3BasicGenerator(){
  		super();
  		supportedIDataTypes.add(GTVectorDataBinding.class);
  		Property[] properties = WPSConfig.getInstance().getPropertiesForGeneratorClass(this.getClass().getCanonicalName());
  		
  		for (Property property : properties) {
                      if(property.getName().equals("srsSyntax")){
                          String srsSyntaxString = property.getStringValue();
                          if(srsSyntaxString != null && !srsSyntaxString.equals("")){
                              srsSyntax = GTHelper.getSrsSyntaxFromString(srsSyntaxString);
                          }
                      }
                  }
  	}
  	
  	public void writeToStream(IData coll, OutputStream os) {
  		FeatureCollection<?,?> fc = ((GTVectorDataBinding)coll).getPayload();
  		
  		FeatureCollection<?,?> correctFeatureCollection = createCorrectFeatureCollection(fc);
  		//get the namespace from the features to pass into the encoder        
          FeatureType schema = correctFeatureCollection.getSchema();
          String namespace = null;
          String schemaLocation = null;
          if(schema !=null){
          	namespace = schema.getName().getNamespaceURI();
          	schemaLocation = SchemaRepository.getSchemaLocation(namespace);
          }
         
          Configuration configuration = null;
          org.geotools.xml.Encoder encoder = null;
          if(schemaLocation==null || namespace==null){
          	namespace = "http://www.opengis.net/gml";
          	schemaLocation = "http://schemas.opengis.net/gml/3.1.1/base/feature.xsd";
          	configuration = new GMLConfiguration();//new ApplicationSchemaConfiguration(namespace, schemaLocation);
              
          	if(srsSyntax != null){
                  ((GMLConfiguration)configuration).setSrsSyntax(srsSyntax);
          	}
          	
              encoder = new org.geotools.xml.Encoder(configuration );
              encoder.setNamespaceAware(true);
              encoder.setSchemaLocation("http://www.opengis.net/gml", "http://schemas.opengis.net/gml/3.1.1/base/feature.xsd");
             
          }else{
          	
          	configuration = new ApplicationSchemaConfiguration(namespace, schemaLocation);
          	if(srsSyntax != null){
          	((org.geotools.gml3.ApplicationSchemaConfiguration)configuration).getDependency(org.geotools.gml3.GMLConfiguration.class).setSrsSyntax(srsSyntax);    
          	}
              encoder = new org.geotools.xml.Encoder(configuration );
              encoder.setNamespaceAware(true);
              encoder.setSchemaLocation("http://www.opengis.net/gml http://schemas.opengis.net/gml/3.1.1/base/feature.xsd", namespace + " " + schemaLocation);
                        
          }
          	
          fc.features().close();
          //use the gml namespace with the FeatureCollection element to start parsing the collection
          QName ns = new QName("http://www.opengis.net/gml","FeatureCollection","wfs");
          try{
              encoder.encode(correctFeatureCollection, ns, os);           
          }catch(IOException e){
          	LOGGER.error("Exception while trying to encode FeatureCollection.", e);
          	throw new RuntimeException(e);
          }
  		
  	}
  
  	@Override
  	public InputStream generateStream(final IData data, String mimeType, String schema) throws IOException {
  		String uuid = UUID.randomUUID().toString();
  		File file = File.createTempFile("gml3"+uuid, ".xml");
  		FileOutputStream outputStream = new FileOutputStream(file);
  		this.writeToStream(data, outputStream);
  		outputStream.flush();
  		outputStream.close();
  		if(file.length() <= 0) {
  			return null;
  		}
  		FileInputStream inputStream = new FileInputStream(file);
  		
  		return inputStream;
  		
  	}
  
  	private SimpleFeatureCollection createCorrectFeatureCollection(FeatureCollection<?,?> fc) {
  		
  		List<SimpleFeature> simpleFeatureList = new ArrayList<SimpleFeature>();
  		SimpleFeatureType featureType = null;
  		FeatureIterator<?> iterator = fc.features();
  		String uuid = UUID.randomUUID().toString();
  		int i = 0;
  		while(iterator.hasNext()){
  			SimpleFeature feature = (SimpleFeature) iterator.next();
  		
  			if(i==0){
  				featureType = GTHelper.createFeatureType(feature.getProperties(), (Geometry)feature.getDefaultGeometry(), uuid, feature.getFeatureType().getCoordinateReferenceSystem());
  				QName qname = GTHelper.createGML3SchemaForFeatureType(featureType);
  				SchemaRepository.registerSchemaLocation(qname.getNamespaceURI(), qname.getLocalPart());
  			}
  			SimpleFeature resultFeature = GTHelper.createFeature("ID"+i, (Geometry)feature.getDefaultGeometry(), featureType, feature.getProperties());
  		
  			simpleFeatureList.add(resultFeature);
  			i++;
  		}
  		iterator.close();
  		
  		ListFeatureCollection resultFeatureCollection = new ListFeatureCollection(featureType, simpleFeatureList);
  		return resultFeatureCollection;
  		
  	}
  
  }
  