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 com.alibaba.spring.util;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.springframework.beans.factory.config.BeanDefinition;
  import org.springframework.beans.factory.support.BeanDefinitionRegistry;
  import org.springframework.beans.factory.support.RootBeanDefinition;
  import org.springframework.core.AliasRegistry;
  import org.springframework.core.io.support.SpringFactoriesLoader;
  
  import java.util.List;
  
  import static java.beans.Introspector.decapitalize;
  import static java.lang.String.format;
  import static org.springframework.core.io.support.SpringFactoriesLoader.loadFactoryNames;
  import static org.springframework.util.ClassUtils.getShortName;
  import static org.springframework.util.ClassUtils.resolveClassName;
  import static org.springframework.util.ObjectUtils.containsElement;
  import static org.springframework.util.StringUtils.hasText;
  
  /**
   * Bean Registrar
   *
   * @since 1.0.3
   */
  public abstract class BeanRegistrar {
  
      private static final Log log = LogFactory.getLog(BeanRegistrar.class);
  
      /**
       * Register Infrastructure Bean
       *
       * @param beanDefinitionRegistry {@link BeanDefinitionRegistry}
       * @param beanType               the type of bean
       * @param beanName               the name of bean
       * @return if it's a first time to register, return <code>true</code>, or <code>false</code>
       */
      public static boolean registerInfrastructureBean(BeanDefinitionRegistry beanDefinitionRegistry,
                                                       String beanName,
                                                       Class<?> beanType) {
  
          boolean registered = false;
  
          if (!beanDefinitionRegistry.containsBeanDefinition(beanName)) {
              RootBeanDefinition beanDefinition = new RootBeanDefinition(beanType);
              beanDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
              beanDefinitionRegistry.registerBeanDefinition(beanName, beanDefinition);
              registered = true;
  
              if (log.isInfoEnabled()) {
                  log.info("The Infrastructure bean definition [" + beanDefinition
                          + "with name [" + beanName + "] has been registered.");
              }
          }
  
          return registered;
      }
  
      /**
       * Detect the alias is present or not in the given bean name from {@link AliasRegistry}
       *
       * @param registry {@link AliasRegistry}
       * @param beanName the bean name
       * @param alias    alias to test
       * @return if present, return <code>true</code>, or <code>false</code>
       */
      public static boolean hasAlias(AliasRegistry registry, String beanName, String alias) {
          return hasText(beanName) && hasText(alias) && containsElement(registry.getAliases(beanName), alias);
      }
  
  
      /**
       * Register the beans from {@link SpringFactoriesLoader#loadFactoryNames(Class, ClassLoader) SpringFactoriesLoader}
       *
       * @param registry       {@link BeanDefinitionRegistry}
       * @param factoryClasses The factory classes to register
       * @return the count of beans that are succeeded to be registered
       * @since 1.0.7
       */
      public static int registerSpringFactoriesBeans(BeanDefinitionRegistry registry, Class<?>... factoryClasses) {
          int count = 0;
  
          ClassLoader classLoader = registry.getClass().getClassLoader();
  
          for (int i = 0; i < factoryClasses.length; i++) {
              Class<?> factoryClass = factoryClasses[i];
              List<String> factoryImplClassNames = loadFactoryNames(factoryClass, classLoader);
              for (String factoryImplClassName : factoryImplClassNames) {
                  Class<?> factoryImplClass = resolveClassName(factoryImplClassName, classLoader);
                  String beanName = decapitalize(getShortName(factoryImplClassName));
                  if (registerInfrastructureBean(registry, beanName, factoryImplClass)) {
                      count++;
                  } else {
                      if (log.isWarnEnabled()) {
                          log.warn(format("The Factory Class bean[%s] has been registered with bean name[%s]",
                                  factoryImplClassName, beanName));
                      }
                  }
              }
          }
  
          return count;
      }
  }
  