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.spatialquery;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.geotools.feature.FeatureCollection;
  import org.geotools.feature.FeatureIterator;
  import org.n52.wps.io.data.IData;
  import org.n52.wps.io.data.binding.complex.GTVectorDataBinding;
  import org.n52.wps.io.data.binding.literal.LiteralBooleanBinding;
  import org.n52.wps.server.AbstractSelfDescribingAlgorithm;
  import org.opengis.feature.simple.SimpleFeature;
  
  import com.vividsolutions.jts.geom.Geometry;
  
  /**
   * @author Benjamin Pross (bpross-52n) 
   *
   */
  public class EqualsAlgorithm extends AbstractSelfDescribingAlgorithm {
  
  	Logger LOGGER = LoggerFactory.getLogger(EqualsAlgorithm.class);
  	private final String inputID1 = "LAYER1";
  	private final String inputID2 = "LAYER2";
  	private final String outputID = "RESULT";
  	private List<String> errors = new ArrayList<String>();
  
  	public List<String> getErrors() {
  		return errors;
  	}
  
  	public Class<GTVectorDataBinding> getInputDataType(String id) {
  		if (id.equalsIgnoreCase(inputID1) || id.equalsIgnoreCase(inputID2)) {
  			return GTVectorDataBinding.class;
  		}
  		return null;
  	}
  
  	public Class<LiteralBooleanBinding> getOutputDataType(String id) {
  		if(id.equalsIgnoreCase(outputID)){
  			return LiteralBooleanBinding.class;
  		}
  		return null;
  	}
  
  	@Override
  	public Map<String, IData> run(Map<String, List<IData>> inputData) {
  
  		if(inputData==null || !inputData.containsKey(inputID1)){
  			throw new RuntimeException("Error while allocating input parameters");
  		}
  		if(inputData==null || !inputData.containsKey(inputID2)){
  			throw new RuntimeException("Error while allocating input parameters");
  		}
  		List<IData> firstDataList = inputData.get(inputID1);
  		if(firstDataList == null || firstDataList.size() != 1){
  			throw new RuntimeException("Error while allocating input parameters");
  		}
  		IData firstInputData = firstDataList.get(0);
  				
  		FeatureCollection<?, ?> firstCollection = ((GTVectorDataBinding) firstInputData).getPayload();
  
  		List<IData> secondDataList = inputData.get(inputID2);
  		if(secondDataList == null || secondDataList.size() != 1){
  			throw new RuntimeException("Error while allocating input parameters");
  		}
  		IData secondInputData = secondDataList.get(0);
  				
  		FeatureCollection<?, ?> secondCollection = ((GTVectorDataBinding) secondInputData).getPayload();
  		
  		FeatureIterator<?> firstIterator = firstCollection.features();
  		
  		FeatureIterator<?> secondIterator = secondCollection.features();
  		
  		if(!firstIterator.hasNext()){
  			throw new RuntimeException("Error while iterating over features in layer 1");
  		}
  		
  		if(!secondIterator.hasNext()){
  			throw new RuntimeException("Error while iterating over features in layer 2");
  		}
  		
  		SimpleFeature firstFeature = (SimpleFeature) firstIterator.next();
  		
  		SimpleFeature secondFeature = (SimpleFeature) secondIterator.next();
  		
  		boolean equals = ((Geometry)firstFeature.getDefaultGeometry()).equals((Geometry)secondFeature.getDefaultGeometry());
  			
  		HashMap<String, IData> result = new HashMap<String, IData>();
  
  		result.put(outputID,
  				new LiteralBooleanBinding(equals));
  		return result;
  	}
  
  	@Override
  	public List<String> getInputIdentifiers() {
  		List<String> identifiers = new ArrayList<String>(2);
  		identifiers.add(inputID1);
  		identifiers.add(inputID2);
  		return identifiers;
  	}
  
  	@Override
  	public List<String> getOutputIdentifiers() {
  		List<String> identifiers = new ArrayList<String>(1);
  		identifiers.add(outputID);
  		return identifiers;
  	}
  
  
  }
  