content: /**
   * ﻿Copyright (C) 2007 - 2019 52°North Initiative for Geospatial Open Source
   * Software GmbH
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.n52.wps.server;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.n52.wps.io.data.IData;
  import org.n52.wps.algorithm.descriptor.AlgorithmDescriptor;
  import org.n52.wps.algorithm.descriptor.LiteralDataInputDescriptor;
  import org.n52.wps.algorithm.descriptor.LiteralDataOutputDescriptor;
  import org.n52.wps.io.data.binding.literal.LiteralStringBinding;
  
  /**
   *
   * @author tkunicki
   */
  public class StringReverseSelfDescribingAlgorithm extends AbstractDescriptorAlgorithm {
  
      public final static String INPUT_STRING = "INPUT_STRING";
      public final static String OUTPUT_STRING = "OUTPUT_STRING";
  
      private static AlgorithmDescriptor DESCRIPTOR;
      protected synchronized static AlgorithmDescriptor getAlgorithmDescriptorStatic() {
          if (DESCRIPTOR == null) {
              DESCRIPTOR =
                  // passing in a class to the AlgorithmDescriptor.builder will set
                  // set the identity to the the fully qualified class name.  If this
                  // is not desired use the String constructor.
                  AlgorithmDescriptor.builder(StringReverseSelfDescribingAlgorithm.class).
                      version("0.0.1").  // default is "1.0.0"
                      title("String Reverse Algorithm (Self Describing)"). // identifier is used if title is not set
                      abstrakt("This is an example algorithm implementation described using a chained builder that reverses a string."). // default is null (not output)
                      statusSupported(false). // default is true
                      storeSupported(false). // default is true
                      addInputDescriptor(
                          LiteralDataInputDescriptor.stringBuilder(INPUT_STRING).
                              title("Input String").      // identifier is used if title is not set
                              abstrakt("The input string you want reversed.").// defaults to null (not output)
                              minOccurs(1).  // defaults to 1
                              maxOccurs(1)). // defaults to 1
                      addOutputDescriptor(
                          LiteralDataOutputDescriptor.stringBuilder(OUTPUT_STRING).
                              title("Output String").         // identifier is used if title is not set
                              abstrakt("The reverse of the input string.")).  // defaults to null (not output).
                      build();
          }
          return DESCRIPTOR;
      }
  
      @Override
      public AlgorithmDescriptor createAlgorithmDescriptor() {
          return getAlgorithmDescriptorStatic();
      }
  
      @Override
      public Map<String, IData> run(Map<String, List<IData>> inputMap) {
          // unwrap input(s)
          List<IData> inputDataList = inputMap.get(INPUT_STRING);
          if (inputDataList == null || inputDataList.isEmpty()) {
              addError("Missing input string!");
              return null;
          }
          IData inputData = inputDataList.get(0);
          if (inputData == null || !(inputData instanceof LiteralStringBinding)) {
              addError("Something wierd happened with the request parser!");
              return null;
          }
          String inputString = ((LiteralStringBinding)inputData).getPayload();
  
          // do work
          String outputString = (new StringBuffer(inputString)).reverse().toString();
  
          // wrap output
          Map<String, IData> outputMap = new HashMap<String, IData>();
          outputMap.put(OUTPUT_STRING, new LiteralStringBinding(outputString));
  
          return outputMap;
      }
  
  }
  