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.common.intermediate.process;
  
  import com.alibaba.graphscope.common.jna.type.FfiNameOrId;
  
  import java.util.*;
  
  public class SinkByColumns implements SinkArg {
      private List<FfiNameOrId.ByValue> columnNames;
  
      public SinkByColumns() {
          columnNames = new ArrayList<>();
      }
  
      public List<FfiNameOrId.ByValue> getColumnNames() {
          return Collections.unmodifiableList(columnNames);
      }
  
      public void addColumnName(FfiNameOrId.ByValue columnName) {
          this.columnNames.add(columnName);
      }
  
      public void dedup() {
          Set<FfiNameOrId.ByValue> uniqueColumnNames = new HashSet<>(columnNames);
          columnNames.clear();
          columnNames.addAll(uniqueColumnNames);
      }
  }
  