content: /*
   * Copyright 2019 The Android Open Source Project
   *
   * 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 android.view.inspector;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  
  /**
   * An inspection companion provider that finds companions as inner classes or generated code.
   *
   * @see android.processor.view.inspector.PlatformInspectableProcessor
   */
  public class StaticInspectionCompanionProvider implements InspectionCompanionProvider {
      /**
       * The suffix used for the generated classes and inner classes
       */
      private static final String COMPANION_SUFFIX = "$InspectionCompanion";
  
      @Override
      @Nullable
      @SuppressWarnings("unchecked")
      public <T> InspectionCompanion<T> provide(@NonNull Class<T> cls) {
          final String companionName = cls.getName() + COMPANION_SUFFIX;
  
          try {
              final Class<InspectionCompanion<T>> companionClass =
                      (Class<InspectionCompanion<T>>) cls.getClassLoader().loadClass(companionName);
  
              if (InspectionCompanion.class.isAssignableFrom(companionClass)) {
                  return companionClass.newInstance();
              } else {
                  return null;
              }
          } catch (ClassNotFoundException e) {
              return null;
          } catch (IllegalAccessException e) {
              throw new RuntimeException(e);
          } catch (InstantiationException e) {
              Throwable cause = e.getCause();
              if (cause instanceof RuntimeException) throw (RuntimeException) cause;
              if (cause instanceof Error) throw (Error) cause;
              throw new RuntimeException(cause);
          }
      }
  }
  