content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.asterix.external.library;
  
  import java.io.InputStream;
  import java.util.Properties;
  
  import org.apache.asterix.external.api.IExternalScalarFunction;
  import org.apache.asterix.external.api.IFunctionHelper;
  import org.apache.asterix.external.library.java.base.JRecord;
  import org.apache.asterix.external.library.java.base.JString;
  
  public class CapitalFinderFunction implements IExternalScalarFunction {
  
      private static Properties capitalList;
      private static final String NOT_FOUND = "NOT_FOUND";
      private JString capital;
  
      @Override
      public void deinitialize() {
          System.out.println("De-Initialized");
      }
  
      @Override
      public void evaluate(IFunctionHelper functionHelper) throws Exception {
          JString country = ((JString) functionHelper.getArgument(0));
          JRecord record = (JRecord) functionHelper.getResultObject();
          String capitalCity = capitalList.getProperty(country.getValue(), NOT_FOUND);
          capital.setValue(capitalCity);
          record.setField("country", country);
          record.setField("capital", capital);
          functionHelper.setResult(record);
      }
  
      @Override
      public void initialize(IFunctionHelper functionHelper) throws Exception {
          InputStream in =
                  CapitalFinderFunction.class.getClassLoader().getResourceAsStream("data/countriesCapitals.properties");
          capitalList = new Properties();
          capitalList.load(in);
          capital = new JString("");
      }
  
  }
  