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.plugin.step;
  
  import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
  import org.apache.tinkerpop.gremlin.process.traversal.Traverser;
  import org.apache.tinkerpop.gremlin.process.traversal.step.map.MapStep;
  
  import java.util.NoSuchElementException;
  
  public class ExprStep<S, E> extends MapStep<S, E> {
      private String expr;
      private Type type;
  
      public ExprStep(Traversal.Admin traversal, String expr, Type type) {
          super(traversal);
          this.expr = expr;
          this.type = type;
      }
  
      @Override
      protected Traverser.Admin<E> processNextStart() throws NoSuchElementException {
          return null;
      }
  
      public String getExpr() {
          return expr;
      }
  
      public Type getType() {
          return type;
      }
  
      public enum Type {
          FILTER,
          PROJECTION
      }
  }
  