content: /*
   * Copyright 2021 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.ds;
  
  import static com.alibaba.graphscope.utils.CppClassName.PROJECTED_NBR;
  import static com.alibaba.graphscope.utils.CppHeaderName.ARROW_PROJECTED_FRAGMENT_H;
  import static com.alibaba.graphscope.utils.CppHeaderName.CORE_JAVA_TYPE_ALIAS_H;
  
  import com.alibaba.fastffi.CXXHead;
  import com.alibaba.fastffi.CXXOperator;
  import com.alibaba.fastffi.CXXReference;
  import com.alibaba.fastffi.CXXValue;
  import com.alibaba.fastffi.FFIGen;
  import com.alibaba.fastffi.FFINameAlias;
  import com.alibaba.fastffi.FFITypeAlias;
  
  /**
   * Definition of Nbr for projected fragment <a
   * href="https://github.com/alibaba/GraphScope/blob/main/analytical_engine/core/fragment/arrow_projected_fragment.h#L121">ProjectedNbr</a>.
   * Representing the neighboring vertex.
   *
   * @param <VID_T> vertex id type.
   * @param <EDATA_T> edge data type.
   */
  @FFIGen
  @CXXHead(ARROW_PROJECTED_FRAGMENT_H)
  @CXXHead(CORE_JAVA_TYPE_ALIAS_H)
  @FFITypeAlias(PROJECTED_NBR)
  public interface ProjectedNbr<VID_T, EDATA_T> extends NbrBase<VID_T, EDATA_T> {
  
      /**
       * Get the neighbor vertex.
       *
       * @return vertex.
       */
      @Override
      @CXXValue
      Vertex<VID_T> neighbor();
  
      /**
       * Edge id for this Nbr, inherited from property graph.
       *
       * @return edge id.
       */
      @FFINameAlias("edge_id")
      long edgeId();
  
      /**
       * Self increment.
       *
       * @return incremented pointer.
       */
      @CXXOperator("++")
      @CXXReference
      ProjectedNbr<VID_T, EDATA_T> inc();
  
      /**
       * Check equality.
       *
       * @param rhs Nbr to be compared with
       * @return true if is the same pointer.
       */
      @CXXOperator("==")
      boolean eq(@CXXReference ProjectedNbr<VID_T, EDATA_T> rhs);
  
      /**
       * Self decrement.
       *
       * @return decreased pointer
       */
      @CXXOperator("--")
      @CXXReference
      ProjectedNbr<VID_T, EDATA_T> dec();
  }
  