content: /*
   * Copyright 2021-2022 Alibaba Group Holding Ltd.
   *
   *    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.
   */
  
  /*
   * 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.aliyun.fastmodel.core.tree.expr.window;
  
  import java.util.List;
  
  import com.aliyun.fastmodel.core.tree.AbstractNode;
  import com.aliyun.fastmodel.core.tree.IAstVisitor;
  import com.aliyun.fastmodel.core.tree.Node;
  import com.aliyun.fastmodel.core.tree.NodeLocation;
  import com.aliyun.fastmodel.core.tree.expr.BaseExpression;
  import com.aliyun.fastmodel.core.tree.statement.select.order.OrderBy;
  import com.google.common.collect.ImmutableList;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  
  /**
   * window
   *
   * @author panguanjing
   */
  @Getter
  @ToString
  @EqualsAndHashCode(callSuper = false)
  public class Window
      extends AbstractNode {
      private final List<BaseExpression> partitionBy;
      private final OrderBy orderBy;
      private final WindowFrame frame;
  
      public Window(List<BaseExpression> partitionBy, OrderBy orderBy, WindowFrame frame) {
          this(null, partitionBy, orderBy, frame);
      }
  
      public Window(NodeLocation location, List<BaseExpression> partitionBy, OrderBy orderBy,
                    WindowFrame frame) {
          super(location);
          this.partitionBy = partitionBy;
          this.orderBy = orderBy;
          this.frame = frame;
      }
  
      @Override
      public <R, C> R accept(IAstVisitor<R, C> visitor, C context) {
          return visitor.visitWindow(this, context);
      }
  
      @Override
      public List<? extends Node> getChildren() {
          ImmutableList.Builder<Node> nodes = ImmutableList.builder();
          nodes.addAll(partitionBy);
          if (orderBy != null) {
              nodes.add(orderBy);
          }
          if (frame != null) {
              nodes.add(frame);
          }
          return nodes.build();
      }
  }
  
  