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.
   *
   * 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.request;
  
  import java.io.InputStream;
  
  import org.apache.commons.collections.map.CaseInsensitiveMap;
  import org.n52.wps.server.ExceptionReport;
  import org.n52.wps.server.database.IDatabase;
  import org.n52.wps.server.database.DatabaseFactory;
  import org.n52.wps.server.response.Response;
  import org.n52.wps.server.response.RetrieveResultResponse;
  
  /**
   * If the server is too busy or the computation is too long,
   * the client can retrieve the result at a later time.
   * This class represents a Request to obtain the result.
   * The respons might be the result, be also could contain a
   * message that the result is not available yet.
   */
  public class RetrieveResultRequest extends Request {
  
  	private InputStream storedResponse = null;
  	
  	/**
  	 * Create a Request based on a CaseInsensitiveMap as input (HTTP GET)
  	 * @param ciMap The Map which holds the client input.
  	 */
  	public RetrieveResultRequest(CaseInsensitiveMap ciMap) throws ExceptionReport{
  		super(ciMap);
  	}
  	
  	/**
  	 * Actually serves the Request.
  	 * @throws ExceptionReport
  	 */
  	public Response call() throws ExceptionReport {
  		if(validate()){
  			return new RetrieveResultResponse(this);
  		}
  		return null;
  	}
  
  	/**
  	 * Validates the client input
  	 * @return True if the input is valid, False otherwise
  	 */
  	public boolean validate() throws ExceptionReport {
  		String req_id = getMapValue("request_id", true);
  		if(req_id.length() == 0){
  			throw new ExceptionReport("The value of parameter <request_id> is not valid.", ExceptionReport.INVALID_PARAMETER_VALUE);
  		}
  		try{
  		}catch(NumberFormatException e){
  			throw new ExceptionReport("The value of parameter <request_id> is not an integer identifier", ExceptionReport.INVALID_PARAMETER_VALUE);
  		}
  		IDatabase db = DatabaseFactory.getDatabase();
  		this.storedResponse = db.lookupResponse(req_id);
  		return (this.storedResponse != null);
  	}
  	
  	public Object getAttachedResult() throws NullPointerException {
  		if(this.storedResponse == null)
  			throw new NullPointerException("No stored responses were found!");
  		return this.storedResponse;
  	}
  
  }
  