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.writer.printer.parquet;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.asterix.om.dictionary.FieldNamesTrieDictionary;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IValueReference;
  import org.apache.hyracks.util.string.UTF8StringUtil;
  
  //    The Field Names Dictionary will cache the mapping between field name bytes and their corresponding string representations,
  //    minimizing the creation of new string objects during field name deserialization while writing to parquet files.
  public class FieldNamesDictionary {
      private final FieldNamesTrieDictionary trie;
      private final List<String> fieldNames;
      private final StringBuilder builder;
  
      public FieldNamesDictionary() {
          trie = new FieldNamesTrieDictionary();
          fieldNames = new ArrayList<>();
          builder = new StringBuilder();
      }
  
      public String getOrCreateFieldNameIndex(IValueReference pointable) throws HyracksDataException {
          int index = trie.getOrCreateFieldNameIndex(pointable);
          if (index < fieldNames.size()) {
              return fieldNames.get(index);
          }
  
          builder.setLength(0);
          String fieldName = UTF8StringUtil.toString(pointable.getByteArray(), pointable.getStartOffset(), builder);
          fieldNames.add(fieldName);
          return fieldName;
      }
  
  }
  