content: /*
   * Copyright 2024-2025 the original author or authors.
   *
   * 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
   *
   *      https://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.cloud.ai.mcp.gateway.core.utils;
  
  import org.apache.commons.lang3.StringUtils;
  import org.springframework.beans.BeansException;
  import org.springframework.beans.factory.config.BeanDefinition;
  import org.springframework.beans.factory.support.DefaultListableBeanFactory;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ConfigurableApplicationContext;
  
  /**
   * SpringBeanUtils.
   */
  public final class SpringBeanUtils {
  
  	private static final SpringBeanUtils INSTANCE = new SpringBeanUtils();
  
  	private ApplicationContext applicationContext;
  
  	private SpringBeanUtils() {
  	}
  
  	/**
  	 * get SpringBeanUtils.
  	 * @return SpringBeanUtils instance
  	 */
  	public static SpringBeanUtils getInstance() {
  		return INSTANCE;
  	}
  
  	/**
  	 * acquire spring bean.
  	 * @param <T> class
  	 * @param type type
  	 * @return bean bean
  	 */
  	public <T> T getBean(final Class<T> type) {
  		return applicationContext.getBean(type);
  	}
  
  	/**
  	 * Gets bean.
  	 * @param <T> the type parameter
  	 * @param beanName the bean name
  	 * @return the bean
  	 */
  	@SuppressWarnings("all")
  	public <T> T getBean(final String beanName) {
  		return (T) applicationContext.getBean(beanName);
  	}
  
  	/**
  	 * Register bean.
  	 * @param beanDefinition the bean definition
  	 * @param classLoader the class loader
  	 * @return the string
  	 */
  	public String registerBean(final BeanDefinition beanDefinition, final ClassLoader classLoader) {
  		String beanClassName = beanDefinition.getBeanClassName();
  		if (StringUtils.isBlank(beanClassName)) {
  			throw new NullPointerException("beanDefinition.beanClassName is null");
  		}
  		String beanName = getBeanName(beanClassName);
  		DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) applicationContext
  			.getAutowireCapableBeanFactory();
  		beanFactory.setBeanClassLoader(classLoader);
  		beanFactory.registerBeanDefinition(beanName, beanDefinition);
  		return beanName;
  	}
  
  	/**
  	 * Exist spring bean boolean. Only applies to successful beans registered by the
  	 * {@linkplain #registerBean(BeanDefinition, ClassLoader)} method.
  	 * @param className the class name
  	 * @return the boolean
  	 */
  	public boolean existBean(final String className) {
  		String beanName = this.getBeanName(className);
  		return this.applicationContext.containsBean(beanName);
  	}
  
  	/**
  	 * Get bean boolean. Only applies to successful beans registered by the
  	 * {@linkplain #registerBean(BeanDefinition, ClassLoader)} method.
  	 * @param <T> the type parameter
  	 * @param className the class name
  	 * @return boolean bean by class name
  	 */
  	@SuppressWarnings("all")
  	public <T> T getBeanByClassName(final String className) {
  		String beanName = this.getBeanName(className);
  		try {
  			return this.getBean(beanName);
  		}
  		catch (BeansException e) {
  			return null;
  		}
  	}
  
  	/**
  	 * destroyBean.
  	 * @param className className
  	 */
  	public void destroyBean(final String className) {
  		String beanName = getBeanName(className);
  		DefaultListableBeanFactory beanFactory = getBeanFactory();
  		if (beanFactory.containsBean(beanName)) {
  			beanFactory.destroySingleton(beanName);
  			beanFactory.removeBeanDefinition(beanName);
  		}
  	}
  
  	private DefaultListableBeanFactory getBeanFactory() {
  		ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;
  		return (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();
  	}
  
  	private String getBeanName(final String className) {
  		String name = className.substring(className.lastIndexOf(".") + 1);
  		String start = name.substring(0, 1);
  		String end = name.substring(1);
  		return start.toLowerCase() + end;
  	}
  
  	/**
  	 * set application context.
  	 * @param applicationContext application context
  	 */
  	public void setApplicationContext(final ApplicationContext applicationContext) {
  		this.applicationContext = applicationContext;
  	}
  
  	public ApplicationContext getApplicationContext() {
  		return applicationContext;
  	}
  
  }
  