package com.atlassian.plugin.spring.scanner.runtime.impl.util;
   
   import org.springframework.beans.factory.config.BeanDefinition;
   import org.springframework.beans.factory.support.BeanDefinitionRegistry;
   
   public class BeanDefinitionChecker {
       /**
        * copyPasta from spring-context:component-scan classes
        *
       * Check the given candidate's bean name, determining whether the corresponding
       * bean definition needs to be registered or conflicts with an existing definition.
       */
      public static boolean needToRegister(String beanName, BeanDefinition beanDefinition, BeanDefinitionRegistry registry) throws IllegalStateException {
          if (!registry.containsBeanDefinition(beanName)) {
              return true;
          }
  
          BeanDefinition existingDef = registry.getBeanDefinition(beanName);
          BeanDefinition originatingDef = existingDef.getOriginatingBeanDefinition();
          if (originatingDef != null) {
              existingDef = originatingDef;
          }
          if (isCompatible(beanDefinition, existingDef)) {
              return false;
          }
          throw new IllegalStateException("Annotation-specified bean name '" + beanName +
                  "' for bean class [" + beanDefinition.getBeanClassName() + "] conflicts with existing, " +
                  "non-compatible bean definition of same name and class [" + existingDef.getBeanClassName() + "]");
      }
  
      /**
       * copyPasta from spring-context:component-scan classes
       *
       * Determine whether the given new bean definition is compatible with
       * the given existing bean definition.
       * <p>The default implementation simply considers them as compatible
       * when the bean class name matches.
       */
      public static boolean isCompatible(BeanDefinition newDefinition, BeanDefinition existingDefinition) {
  
          return (newDefinition.getBeanClassName().equals(existingDefinition.getBeanClassName()) ||
                  newDefinition.equals(existingDefinition));
      }
  }