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 com.google.common.base.Joiner;
  import java.util.ArrayList;
  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 StringJoinSelfDescribingAlgorithm extends AbstractDescriptorAlgorithm  {
  
      public final static String INPUT_STRINGS = "INPUT_STRINGS";
      public final static String INPUT_DELIMITER = "INPUT_DELIMITER";
      public final static String OUTPUT_STRING = "OUTPUT_STRING";
      
      public enum Delimiter {
          SPACE(' '),
          TAB('\t'),
          PIPE('|'),
          COMMA(','),
          SEMI_COLON(';'),
          COLON(':');
          public final char value;
          Delimiter(char value) {
              this.value = value;
          }
      }
  
      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(StringJoinSelfDescribingAlgorithm.class).
                      version("0.0.1").  // default is "1.0.0"
                      title("String Join Algorithm (Self Describing)"). // identifier is used if title is not set
                      abstrakt("This is an example algorithm implementation described using a chained builder that joins strings using the specified delimiter."). // default is null (not output)
                      statusSupported(false). // default is true
                      storeSupported(false). // default is true
                      addInputDescriptor(
                          LiteralDataInputDescriptor.stringBuilder(INPUT_STRINGS).
                              title("Input Strings").      // identifier is used if title is not set
                              abstrakt("The strings you want joined.").// defaults to null (not output)
                              minOccurs(2).  // defaults to 1
                              maxOccurs(32)).
                      addInputDescriptor(
                          LiteralDataInputDescriptor.stringBuilder(INPUT_DELIMITER).
                              title("Delimiter").      // identifier is used if title is not set
                              abstrakt("The value to use when joining strings"). // defaults to null (not output)
                              allowedValues(Delimiter.class)).
                      addOutputDescriptor(
                          LiteralDataOutputDescriptor.stringBuilder(OUTPUT_STRING).
                              title("Output String").         // identifier is used if title is not set
                              abstrakt("The strings joined with the delimiter")).  // 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 strings and error check
          List<IData> inputBoundStringList = inputMap.get(INPUT_STRINGS);
          if (inputBoundStringList == null || inputBoundStringList.size() < 2) {
              addError("Invalid parameter count for" + INPUT_STRINGS);
              return null;
          }
          List<String> inputStringList = new ArrayList<String>();
          for (IData boundString : inputBoundStringList) {
              if (boundString == null || !(boundString instanceof LiteralStringBinding)) {
                  addError("unexpected binding ecountered unbinding " + INPUT_STRINGS + " parameter list");
                  return null;
              }
              String inputString = ((LiteralStringBinding)boundString).getPayload();
              if (inputString == null || inputString.length() == 0) {
                  addError("invalid value encounterd in " + INPUT_STRINGS + " parameter list");
              }
              inputStringList.add(inputString);
          }
          
          // unwrap input delimiter and error check
          List<IData> inputBoundDelimiterList = inputMap.get(INPUT_DELIMITER);
          if (inputBoundDelimiterList == null || inputBoundDelimiterList.size() != 1) {
              addError("Invalid parameter count for" + INPUT_DELIMITER);
              return null;
          }
          
          IData inputBoundDelimiterData = inputBoundDelimiterList.get(0);
          if (inputBoundDelimiterData == null || !(inputBoundDelimiterData instanceof LiteralStringBinding)) {
              addError("Something wierd happened with the request parser!");
              return null;
          }
          String inputDelimiterString = ((LiteralStringBinding)inputBoundDelimiterData).getPayload();
          Delimiter inputDelimiter = null;
          try {
              inputDelimiter = Delimiter.valueOf(inputDelimiterString);
          } catch (IllegalArgumentException e) {
              addError("invalid value encounterd for " + INPUT_DELIMITER + " parameter");
              return null;
          }
          
          // do work
          String outputString = Joiner.on(inputDelimiter.value).join(inputStringList);
          
          // wrap output
          Map<String, IData> outputMap = new HashMap<String, IData>();
          outputMap.put(OUTPUT_STRING, new LiteralStringBinding(outputString));
  
          return outputMap;
      }
  
  }
  