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.carbondata.processing.loading.parser.impl;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Pattern;
  
  import org.apache.carbondata.core.util.CarbonUtil;
  import org.apache.carbondata.processing.loading.complexobjects.StructObject;
  import org.apache.carbondata.processing.loading.parser.ComplexParser;
  import org.apache.carbondata.processing.loading.parser.GenericParser;
  
  import org.apache.commons.lang.ArrayUtils;
  
  /**
   * It parses the string to @{@link StructObject} using delimiter.
   * It is thread safe as the state of class don't change while
   * calling @{@link GenericParser#parse(Object)} method
   */
  public class StructParserImpl implements ComplexParser<Object> {
  
    private Pattern pattern;
  
    private List<GenericParser> children = new ArrayList<>();
  
    private String nullFormat;
  
    public StructParserImpl(String delimiter, String nullFormat) {
      pattern = Pattern.compile(CarbonUtil.delimiterConverter(delimiter));
      this.nullFormat = nullFormat;
    }
  
    @Override
    public Object parse(Object data) {
      if (data != null) {
        String value = data.toString();
        if (value.isEmpty()) {
          return value;
        }
        if (!value.equals(nullFormat)) {
          String[] split = pattern.split(value, -1);
          if (ArrayUtils.isNotEmpty(split)) {
            Object[] array = new Object[children.size()];
            for (int i = 0; i < split.length && i < array.length; i++) {
              array[i] = children.get(i).parse(split[i]);
            }
            return new StructObject(array);
          }
        }
      }
      return null;
    }
  
    @Override
    public Object parseRaw(Object data) {
      Object[] d = ((Object[]) data);
      Object[] array = new Object[children.size()];
      for (int i = 0; i < d.length; i++) {
        array[i] = children.get(i).parseRaw(d[i]);
      }
      return new StructObject(array);
    }
  
    @Override
    public void addChildren(GenericParser parser) {
      children.add(parser);
    }
  }
  