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.server.core.oal.rt;
  
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  
  import org.apache.skywalking.oap.server.core.Const;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Define multiple OAL configuration
   */
  @Getter
  @ToString
  @EqualsAndHashCode
  public abstract class OALDefine {
      protected OALDefine(final String configFile,
                          final String sourcePackage) {
          this(configFile, sourcePackage, Const.EMPTY_STRING);
      }
  
      /**
       * Define the booting parameters for OAL engine
       *
       * @param configFile    OAL script file path
       * @param sourcePackage the package path of source(s) used in given config OAL script file
       * @param catalog       of metrics defined through given OAL script file. Be used as prefix of generated dispatcher
       *                      class name.
       */
      protected OALDefine(final String configFile,
                          final String sourcePackage,
                          final String catalog) {
          this.configFile = requireNonNull(configFile);
          this.sourcePackage = appendPoint(requireNonNull(sourcePackage));
          this.dynamicMetricsClassPackage = "org.apache.skywalking.oap.server.core.source.oal.rt.metrics.";
          this.dynamicMetricsBuilderClassPackage = "org.apache.skywalking.oap.server.core.source.oal.rt.metrics.builder.";
          this.dynamicDispatcherClassPackage = StringUtil.isBlank(catalog) ?
              "org.apache.skywalking.oap.server.core.source.oal.rt.dispatcher." :
              "org.apache.skywalking.oap.server.core.source.oal.rt.dispatcher." + catalog;
      }
  
      private final String configFile;
      private final String sourcePackage;
      private final String dynamicMetricsClassPackage;
      private final String dynamicMetricsBuilderClassPackage;
      private final String dynamicDispatcherClassPackage;
  
      private String appendPoint(String classPackage) {
          if (classPackage.endsWith(Const.POINT)) {
              return classPackage;
          }
          return classPackage + Const.POINT;
      }
  }
  