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.
   */
  
  package com.aliyun.fastmodel.core.tree.statement.rule.strategy;
  
  import java.util.List;
  
  import com.aliyun.fastmodel.core.tree.AstVisitor;
  import com.aliyun.fastmodel.core.tree.Node;
  import com.aliyun.fastmodel.core.tree.QualifiedName;
  import com.aliyun.fastmodel.core.tree.expr.BaseExpression;
  import com.aliyun.fastmodel.core.tree.expr.atom.FunctionCall;
  import com.aliyun.fastmodel.core.tree.expr.literal.BaseLiteral;
  import com.aliyun.fastmodel.core.tree.expr.literal.LongLiteral;
  import com.aliyun.fastmodel.core.tree.statement.rule.RuleStrategy;
  import com.aliyun.fastmodel.core.tree.statement.rule.function.BaseFunction;
  import com.google.common.collect.ImmutableList;
  import lombok.Getter;
  import lombok.ToString;
  
  /**
   * 动态阈值策略
   *
   * @author panguanjing
   * @date 2021/5/30
   */
  @Getter
  @ToString
  public class DynamicStrategy extends RuleStrategy {
  
      public static final QualifiedName DYNMIAC = QualifiedName.of("DYNMIAC");
      /**
       * 采样固定值函数
       */
      private final BaseFunction baseFunction;
  
      /**
       * 动态阈值算法时间周期
       */
      private final BaseLiteral number;
  
      public DynamicStrategy(BaseFunction baseFunction, BaseLiteral number) {
          this.baseFunction = baseFunction;
          this.number = number;
      }
  
      public Integer getNumberValue() {
          if (number instanceof LongLiteral) {
              LongLiteral longLiteral = (LongLiteral)number;
              return longLiteral.getValue().intValue();
          }
          return 0;
      }
  
      @Override
      public List<? extends Node> getChildren() {
          return ImmutableList.of(baseFunction);
      }
  
      @Override
      public BaseFunction getFunction() {
          return baseFunction;
      }
  
      @Override
      public BaseExpression toExpression() {
          return new FunctionCall(DYNMIAC, false, ImmutableList.of(baseFunction, number));
      }
  
      @Override
      public <R, C> R accept(AstVisitor<R, C> visitor, C context) {
          return visitor.visitDynamicStrategy(this, context);
      }
  }
  