content: /*
   * Copyright (C) 2012-2020 Markus Junginger, greenrobot (http://greenrobot.org)
   *
   * 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 org.greenrobot.eventbus.util;
  
  import org.greenrobot.eventbus.Logger;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  import java.util.logging.Level;
  
  /**
   * Maps throwables to texts for error dialogs. Use Config to configure the mapping.
   *
   * @author Markus
   */
  public class ExceptionToResourceMapping {
  
    public final Map<Class<? extends Throwable>, Integer> throwableToMsgIdMap;
  
    public ExceptionToResourceMapping() {
      throwableToMsgIdMap = new HashMap<>();
    }
  
    /** Looks at the exception and its causes trying to find an ID. */
    public Integer mapThrowable(final Throwable throwable) {
      Throwable throwableToCheck = throwable;
      int depthToGo = 20;
  
      while (true) {
        Integer resId = mapThrowableFlat(throwableToCheck);
        if (resId != null) {
          return resId;
        } else {
          throwableToCheck = throwableToCheck.getCause();
          depthToGo--;
          if (depthToGo <= 0 || throwableToCheck == throwable || throwableToCheck == null) {
            Logger logger = Logger.Default.get(); // No EventBus instance here
            logger.log(Level.FINE, "No specific message resource ID found for " + throwable);
            // return config.defaultErrorMsgId;
            return null;
          }
        }
      }
    }
  
    /** Mapping without checking the cause (done in mapThrowable). */
    protected Integer mapThrowableFlat(Throwable throwable) {
      Class<? extends Throwable> throwableClass = throwable.getClass();
      Integer resId = throwableToMsgIdMap.get(throwableClass);
      if (resId == null) {
        Class<? extends Throwable> closestClass = null;
        Set<Entry<Class<? extends Throwable>, Integer>> mappings = throwableToMsgIdMap.entrySet();
        for (Entry<Class<? extends Throwable>, Integer> mapping : mappings) {
          Class<? extends Throwable> candidate = mapping.getKey();
          if (candidate.isAssignableFrom(throwableClass)) {
            if (closestClass == null || closestClass.isAssignableFrom(candidate)) {
              closestClass = candidate;
              resId = mapping.getValue();
            }
          }
        }
      }
      return resId;
    }
  
    public ExceptionToResourceMapping addMapping(Class<? extends Throwable> clazz, int msgId) {
      throwableToMsgIdMap.put(clazz, msgId);
      return this;
    }
  }
  