/**
    * Copyright © 2018 spring-data-dynamodb (https://github.com/derjust/spring-data-dynamodb)
    *
    * 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.socialsignin.spring.data.dynamodb.utils;
  
  import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;
  import org.springframework.dao.DataAccessException;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Queue;
  import java.util.stream.Collectors;
  
  public interface ExceptionHandler {
  
  	default <T extends DataAccessException> T repackageToException(List<DynamoDBMapper.FailedBatch> failedBatches,
  			Class<T> targetType) {
  		// Error handling:
  		Queue<Exception> allExceptions = failedBatches.stream().map(it -> it.getException())
  				.collect(Collectors.toCollection(LinkedList::new));
  
  		// The first exception is hopefully the cause
  		Exception cause = allExceptions.poll();
  		try {
  			Constructor<T> ctor = targetType.getConstructor(String.class, Throwable.class);
  			T e = ctor.newInstance("Processing of entities failed!", cause);
  			// and all other exceptions are 'just' follow-up exceptions
  			allExceptions.stream().forEach(e::addSuppressed);
  			return e;
  		} catch (NoSuchMethodException | InstantiationException | IllegalAccessException
  				| InvocationTargetException e) {
  			assert false; // we should never end up here
  			throw new RuntimeException("Could not repackage '" + failedBatches + "' to " + targetType, e);
  		}
  	}
  }