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.oal.rt.util;
  
  public class TypeCastUtil {
      /**
       * @param castType           to change the value of given original expression.
       * @param originalExpression to read the value
       * @return cast expression if cast type exists and is legal.
       */
      public static String withCast(String castType, String originalExpression) {
          if (castType == null) {
              return originalExpression;
          }
          switch (castType) {
              case "(str->long)":
              case "(long)":
                  return "Long.parseLong(" + originalExpression + ")";
              case "(str->int)":
              case "(int)":
                  return "Integer.parseInt(" + originalExpression + ")";
              default:
                  throw new IllegalArgumentException(
                      "castType:" + castType + " is legal, context expression:" + originalExpression);
          }
      }
  }
  