content: /*
   * 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.camel.spring.boot;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import org.apache.camel.Exchange;
  import org.apache.camel.TypeConversionException;
  import org.apache.camel.support.TypeConverterSupport;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.core.convert.ConversionFailedException;
  import org.springframework.core.convert.ConversionService;
  import org.springframework.core.convert.ConverterNotFoundException;
  import org.springframework.core.convert.TypeDescriptor;
  
  public class SpringTypeConverter extends TypeConverterSupport {
  
      private final List<ConversionService> conversionServices;
      private final ConcurrentHashMap<Class<?>, TypeDescriptor> types;
  
      @Autowired
      public SpringTypeConverter(List<ConversionService> conversionServices) {
          this.conversionServices = conversionServices;
          this.types = new ConcurrentHashMap<>();
      }
  
      @Override
      public <T> T convertTo(Class<T> type, Exchange exchange, Object value) throws TypeConversionException {
          // do not attempt to convert Camel types
          if (type.getCanonicalName().startsWith("org.apache")) {
              return null;
          }
  
          // do not attempt to convert List -> Map. Ognl expression may use this converter as a fallback expecting null
          if (type.isAssignableFrom(Map.class) && isArrayOrCollection(value)) {
              return null;
          }
  
          TypeDescriptor sourceType = types.computeIfAbsent(value.getClass(), TypeDescriptor::valueOf);
          TypeDescriptor targetType = types.computeIfAbsent(type, TypeDescriptor::valueOf);
  
          for (ConversionService conversionService : conversionServices) {
              if (conversionService.canConvert(sourceType, targetType)) {
                  try {
                      return (T) conversionService.convert(value, sourceType, targetType);
                  } catch (ConversionFailedException e) {
                      // if value is a collection or an array the check ConversionService::canConvert
                      // may return true but then the conversion of specific objects may fail
                      //
                      // https://issues.apache.org/jira/browse/CAMEL-10548
                      // https://jira.spring.io/browse/SPR-14971
                      //
                      if (e.getCause() instanceof ConverterNotFoundException && isArrayOrCollection(value)) {
                          return null;
                      } else {
                          throw new TypeConversionException(value, type, e);
                      }
                  }
              }
          }
  
          return null;
      }
  
      private boolean isArrayOrCollection(Object value) {
          return value instanceof Collection || value.getClass().isArray();
      }
  }
  