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.FileWriter;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Writer;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  import javax.xml.transform.TransformerException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.geotools.feature.FeatureCollection;
  import org.geotools.gml.producer.FeatureTransformer;
  import org.geotools.gml.producer.FeatureTransformer.FeatureTypeNamespaces;
  import org.n52.wps.PropertyDocument.Property;
  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.Feature;
  import org.opengis.feature.type.FeatureType;
  import org.opengis.referencing.ReferenceIdentifier;
  import org.opengis.referencing.crs.CoordinateReferenceSystem;
  
  /**
   * @author Theodor Foerster, ITC; Matthias Mueller, TU Dresden
   *
   */
  public class GML2BasicGenerator extends AbstractGenerator {
  	
  	private boolean featureTransformerIncludeBounding;
  	private int featureTransformerDecimalPlaces;
  	
  	private static Logger LOGGER = LoggerFactory.getLogger(GML2BasicGenerator.class);
  		
  	
  	public GML2BasicGenerator(){
  		super();
  		supportedIDataTypes.add(GTVectorDataBinding.class);
  		
  		featureTransformerIncludeBounding = false;
  		featureTransformerDecimalPlaces = 4;
  		for(Property property : properties){
  			if(property.getName().equalsIgnoreCase("featureTransformerIncludeBounding")){
  				featureTransformerIncludeBounding = new Boolean(property.getStringValue());
  				
  			}
  			if(property.getName().equalsIgnoreCase("featureTransformerDecimalPlaces")){
  				featureTransformerDecimalPlaces = new Integer(property.getStringValue());
  				
  			}
  		}
  	}
  	
  	private void write(IData data, Writer writer) throws IOException {
  		FeatureCollection<?,?> fc = ((GTVectorDataBinding)data).getPayload();
  		// this might be a workaround... 
  		if(fc == null || fc.size() == 0) {
  			writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>");
  			writer.write("<wfs:FeatureCollection xmlns:wfs=\"http://www.opengis.net/wfs\" xmlns:gml=\"http://www.opengis.net/gml\"/>");
  			writer.flush();
  		}
  		Feature f = fc.features().next();
  		FeatureType ft = f.getType();
  		//String srsName = (String)f.getDefaultGeometry().getUserData();
  	
  		Map<Object, Object> userData = f.getUserData();
  		Object srs = userData.get("srs");
  		String srsName = null;
  		
  		if (srs instanceof String) {
  			srsName = (String) srs;
  		}
  		else if(srs instanceof CoordinateReferenceSystem) {
  			Iterator<ReferenceIdentifier> iter = ((CoordinateReferenceSystem)srs).getIdentifiers().iterator();
  	        if(iter.hasNext()){
  	        	srsName= iter.next().toString();
  	        }
  		}
  		
  		
  		FeatureTransformer tx = new FeatureTransformer();
  		tx.setFeatureBounding(featureTransformerIncludeBounding);
  		tx.setNumDecimals(featureTransformerDecimalPlaces);
  	    FeatureTypeNamespaces ftNames = tx.getFeatureTypeNamespaces();
          // StringBuffer typeNames = new StringBuffer();
          
  		Map<String, String> ftNamespaces = new HashMap<String, String>();
  
  		String uri = ft.getName().getNamespaceURI();
  		ftNames.declareNamespace(fc.getSchema(), fc.getSchema().getName().getLocalPart(), uri);
  
          if (ftNamespaces.containsKey(uri)) {
              String location = (String) ftNamespaces.get(uri);
  			ftNamespaces.put(uri, location + "," + fc.getSchema().getName().getLocalPart());
          } else {
              ftNamespaces.put(uri, uri);
          }
  
          if(srsName != null) {
          	tx.setSrsName(srsName);
          }
          
          String namespace = f.getType().getName().getNamespaceURI();
          String schemaLocation = SchemaRepository.getSchemaLocation(namespace);
          
          tx.addSchemaLocation(uri,schemaLocation);
  		tx.addSchemaLocation("http://www.opengis.net/wfs", "http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd");
  		
  		try{
  			tx.transform( fc, writer);
  			writer.close();
  		}
  		catch(TransformerException e) {
  			LOGGER.error(e.getMessage());
  			throw new IOException("Unable to generate GML");
  		}
  	}
  	
  	@Override
  	public InputStream generateStream(IData data, String mimeType, String schema) throws IOException {
  		
  		File tempFile = File.createTempFile("gml2", "xml");
  		finalizeFiles.add(tempFile);
  		FileWriter fw = new FileWriter(tempFile);
  		write(data, fw);
  		fw.close();
  		InputStream is = new FileInputStream(tempFile);
  		return is;
  		
  	}
  
  }
  