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   *  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
   *
   *    https://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
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   ****************************************************************/
  
  package org.apache.cayenne.exp.parser;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * @since 4.2
   */
  class ExpressionUtils {
      static void parsePath(ASTPath pathExp, String path) throws ParseException {
          if(path == null || !path.contains("#")) {
              pathExp.setPath(path);
              return;
          }
  
          String[] pathSegments = path.split("\\.");
          Map<String, String> aliasMap = new HashMap<>(pathSegments.length);
          for (int i = 0; i < pathSegments.length; i++) {
              if (pathSegments[i].contains("#")) {
                  String[] splitSegment = pathSegments[i].split("#");
                  if(splitSegment[1].endsWith("+")) {
                      splitSegment[0] += '+';
                      splitSegment[1] = splitSegment[1].substring(0, splitSegment[1].length() - 1);
                  }
                  String previousAlias = aliasMap.putIfAbsent(splitSegment[1], splitSegment[0]);
                  if (previousAlias != null && !previousAlias.equals(splitSegment[0])) {
                      throw new ParseException("Can't add the same alias to different path segments.");
                  }
                  pathSegments[i] = splitSegment[1];
              }
          }
          pathExp.setPath(String.join(".", pathSegments));
          pathExp.setPathAliases(aliasMap);
      }
  
  }
  