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.converter.jaxb;
  
  import java.lang.reflect.Method;
  import java.util.Map;
  
  import jakarta.xml.bind.annotation.XmlElementDecl;
  
  import org.apache.camel.CamelContext;
  import org.apache.camel.support.LRUCacheFactory;
  
  public final class JaxbHelper {
  
      private static final Map<Class<?>, Method> JAXB_ELEMENT_FACTORY_METHODS = LRUCacheFactory.newLRUSoftCache(10, 100, true);
  
      private JaxbHelper() {
      }
  
      public static <T> Method getJaxbElementFactoryMethod(CamelContext camelContext, Class<T> type) {
          if (camelContext == null) {
              return null;
          }
  
          return JAXB_ELEMENT_FACTORY_METHODS.computeIfAbsent(type, t -> findJaxbElementFactoryMethod(camelContext, t));
      }
  
      private static <T> Method findJaxbElementFactoryMethod(CamelContext camelContext, Class<T> type) {
          // find the first method that has @XmlElementDecl with one parameter that matches the type
          Class<?> factory = getObjectFactory(camelContext, type);
          if (factory != null) {
              for (Method m : factory.getMethods()) {
                  final XmlElementDecl a = m.getAnnotation(XmlElementDecl.class);
                  if (a == null) {
                      continue;
                  }
                  final Class<?>[] parameters = m.getParameterTypes();
                  if (parameters.length == 1 && parameters[0].isAssignableFrom(type)) {
                      return m;
                  }
              }
          }
  
          return null;
      }
  
      public static <T> Class<?> getObjectFactory(CamelContext camelContext, Class<T> type) {
          if (camelContext == null) {
              return null;
          }
  
          if (type.getPackage() != null) {
              String objectFactoryClassName = type.getPackage().getName() + ".ObjectFactory";
              return camelContext.getClassResolver().resolveClass(objectFactoryClassName);
          }
          return null;
      }
  
  }
  