code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.skywalking.oap.meter.analyzer.dsl;
  
  import groovy.lang.Closure;
  import io.vavr.Function2;
  
  /**
   * NumberClosure intends to extend primitive Number to do binary operation with {@link SampleFamily}
   */
  public class NumberClosure extends Closure<SampleFamily> {
  
      private final Function2<Number, SampleFamily, SampleFamily> fn;
  
      public NumberClosure(Object owner, Function2<Number, SampleFamily, SampleFamily> fn) {
          super(owner);
          this.fn = fn;
      }
  
      /**
       * Call binary operation, for instances, {@code 100 + server_cpu_seconds}. {@code server_cpu_seconds}'s type
       * should be {@link SampleFamily}
       *
       * @param arguments the right-hand side of binary operation, usually a {@link SampleFamily} object.
       * @return the result of binary operation.
       */
      @Override
      public SampleFamily call(Object arguments) {
          return fn.apply((Number) this.getDelegate(), (SampleFamily) arguments);
      }
  
      /**
       * getParameterTypes hints the right-hand side should be {@link SampleFamily}.
       *
       * @return the class array contains argument type.
       */
      @Override
      public Class[] getParameterTypes() {
          return new Class[] { SampleFamily.class};
      }
  }
  
  