content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.graphscope.gremlin.antlr4;
  
  import org.antlr.v4.runtime.tree.ParseTree;
  
  public class TraversalEnumParser {
  
      /**
       * Parse enum text from a parse tree context into a enum object
       *
       * @param enumType : class of enum
       * @param context  : parse tree context
       * @return enum object
       */
      public static <E extends Enum<E>, C extends ParseTree> E parseTraversalEnumFromContext(
              final Class<E> enumType, final C context) {
          final String text = context.getText();
          final String className = enumType.getSimpleName();
  
          // Support qualified class names like (ex: T.id or Scope.local)
          if (text.startsWith(className)) {
              final String strippedText = text.substring(className.length() + 1);
              return E.valueOf(enumType, strippedText);
          } else {
              return E.valueOf(enumType, text);
          }
      }
  }
  