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.fuzzyjoin;
  
  import java.util.regex.Pattern;
  
  public class FuzzyJoinUtil {
      private static final Pattern rePunctuation = Pattern.compile("[^\\p{L}\\p{N}]"); // L:Letter, N:Number
      private static final Pattern reSpaceOrAnderscore = Pattern.compile("(_|\\s)+");
  
      public static String clean(String in) {
          /*
           * - remove punctuation
           *
           * - normalize case
           *
           * - remove extra spaces
           *
           * - repalce space with FuzzyJoinDriver.TOKEN_SEPARATOR
           */
  
          in = rePunctuation.matcher(in).replaceAll(" ");
          in = reSpaceOrAnderscore.matcher(in).replaceAll(" ");
          in = in.trim();
          in = in.replace(' ', '_');
          in = in.toLowerCase();
          return in;
      }
  
      /**
       * @param splits
       *            splitted record
       * @param dataColumns
       *            column index of data columns
       * @param tokenSeparator
       *            TODO
       * @return concatenation of data column values
       */
      public static String getData(Object[] splits, int[] dataColumns, char tokenSeparator) {
          String data = null;
          for (int dataColumn : dataColumns) {
              if (data != null) {
                  data += tokenSeparator;
              }
              if (splits.length > dataColumn) {
                  if (data == null) {
                      data = "";
                  }
                  // data += splits[dataColumns[i]];
                  data += clean(splits[dataColumn].toString());
              }
          }
          return data;
      }
  
      /**
       * @param columnsString
       *            string containing the indexes of the columns containing data
       * @return array of data columns indexes
       */
      public static int[] getDataColumns(String columnsString) {
          String[] splits = columnsString.split(FuzzyJoinConfig.RECORD_DATA_VALUE_SEPARATOR_REGEX);
          int[] columns = new int[splits.length];
          for (int i = 0; i < splits.length; i++) {
              columns[i] = Integer.parseInt(splits[i]);
          }
          return columns;
      }
  
  }
  