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.apex.examples.FileToJdbcApp;
  
  import java.util.regex.Pattern;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import com.datatorrent.api.Context.OperatorContext;
  import com.datatorrent.api.DefaultInputPort;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
  import com.datatorrent.common.util.BaseOperator;
  
  // parse input line into pojo event
  /**
   * @since 3.8.0
   */
  public class CustomParser extends BaseOperator
  {
    private static final Logger LOG = LoggerFactory.getLogger(CustomParser.class);
  
    // default regex pattern for parsing each line
    private static final Pattern RegexDefault = Pattern.compile("[\\p{Punct}\\s]+");
  
    private String regexStr; // customized configurable regex string
    private transient Pattern regexPattern; // compiled regex pattern generated from customized regex string
  
    @OutputPortFieldAnnotation(optional = false)
    public final transient DefaultOutputPort<PojoEvent> output = new DefaultOutputPort<>();
  
    public final transient DefaultInputPort<String> input = new DefaultInputPort<String>()
    {
      @Override
      public void process(String line)
      {
        // use custom regex to split line into words
        final String[] words = regexPattern.split(line);
  
        PojoEvent pojo = new PojoEvent();
        // transform words array into pojo event
        try {
          int accnum = Integer.parseInt(words[0]);
          pojo.setAccountNumber(accnum);
        } catch (NumberFormatException e) {
          LOG.error("Number Format Exception", e);
          pojo.setAccountNumber(0);
        }
        String name = words[1];
        pojo.setName(name);
        try {
          int amount = Integer.parseInt(words[2]);
          pojo.setAmount(amount);
        } catch (NumberFormatException e) {
          LOG.error("Number Format Exception", e);
          pojo.setAmount(0);
        }
        output.emit(pojo);
      }
    };
  
    public String getRegexStr()
    {
      return this.regexStr;
    }
  
    public void setRegexStr(String regex)
    {
      this.regexStr = regex;
    }
  
    @Override
    public void setup(OperatorContext context)
    {
      if (null == regexStr) {
        regexPattern = RegexDefault;
      } else {
        regexPattern = Pattern.compile(this.getRegexStr());
      }
    }
  
  }
  
  