content: /*
   * 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 io.airlift.bytecode;
  
  import org.objectweb.asm.ClassWriter;
  
  import static io.airlift.bytecode.ParameterizedType.typeFromPathName;
  
  public class SmartClassWriter
          extends ClassWriter
  {
      private final ClassInfoLoader classInfoLoader;
  
      public SmartClassWriter(ClassInfoLoader classInfoLoader)
      {
          super(ClassWriter.COMPUTE_FRAMES);
          this.classInfoLoader = classInfoLoader;
      }
  
      @Override
      protected String getCommonSuperClass(String aType, String bType)
      {
          ClassInfo aClassInfo = classInfoLoader.loadClassInfo(typeFromPathName(aType));
          ClassInfo bClassInfo = classInfoLoader.loadClassInfo(typeFromPathName(bType));
  
          if (aClassInfo.isAssignableFrom(bClassInfo)) {
              return aType;
          }
          if (bClassInfo.isAssignableFrom(aClassInfo)) {
              return bType;
          }
          if (aClassInfo.isInterface() || bClassInfo.isInterface()) {
              return "java/lang/Object";
          }
          else {
              do {
                  aClassInfo = aClassInfo.getSuperclass();
              }
              while (!aClassInfo.isAssignableFrom(bClassInfo));
              return aClassInfo.getType().getClassName();
          }
      }
  }
  