content: /*  1
   * 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 org.apache.asterix.external.api.IExternalScalarFunction;
  import org.apache.asterix.external.api.IFunctionHelper;
  import org.apache.asterix.external.library.java.JBuiltinType;
  import org.apache.asterix.external.library.java.JTypeTag;
  import org.apache.asterix.external.library.java.base.JRecord;
  import org.apache.asterix.external.library.java.base.JString;
  import org.apache.asterix.external.library.java.base.JUnorderedList;
  
  public class addMentionedUsersFunction implements IExternalScalarFunction {
  
      private JUnorderedList list = null;
      private String textFieldName;
  
      @Override
      public void initialize(IFunctionHelper functionHelper) {
          list = new JUnorderedList(JBuiltinType.JSTRING);
          textFieldName = functionHelper.getParameters().get("textFieldName");
      }
  
      @Override
      public void deinitialize() {
      }
  
      @Override
      public void evaluate(IFunctionHelper functionHelper) throws Exception {
          list.clear();
          JRecord inputRecord = (JRecord) functionHelper.getArgument(0);
          JString text = (JString) inputRecord.getValueByName(textFieldName);
  
          String[] tokens = text.getValue().split(" ");
          for (String tk : tokens) {
              if (tk.startsWith("@")) {
                  JString newField = (JString) functionHelper.getObject(JTypeTag.STRING);
                  newField.setValue(tk);
                  list.add(newField);
              }
          }
          inputRecord.addField("mentionedUsers", list);
          functionHelper.setResult(inputRecord);
      }
  
  }
  