me.tfeng.toolbox.spring.BeanNameRegistry.java Source code

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Here is the source code for me.tfeng.toolbox.spring.BeanNameRegistry.java

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/**
 * Copyright 2016 Thomas Feng
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 me.tfeng.toolbox.spring;

import java.util.Arrays;
import java.util.Map;

import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;

import com.google.common.collect.Maps;

/**
 * @author Thomas Feng (huining.feng@gmail.com)
 */
public class BeanNameRegistry implements ApplicationListener<ContextRefreshedEvent> {

    private static class ShadowKey {

        private int hashCode;

        private Object object;

        ShadowKey(Object object) {
            this.object = object;
            hashCode = System.identityHashCode(object);
        }

        @Override
        public boolean equals(Object object) {
            return object instanceof ShadowKey && this.object == ((ShadowKey) object).object;
        }

        @Override
        public int hashCode() {
            return hashCode;
        }
    }

    private final Map<Object, String> beanMap = Maps.newHashMap();

    public boolean exists(Object bean) {
        return beanMap.containsKey(new ShadowKey(bean));
    }

    public String getName(Object bean) {
        return beanMap.get(new ShadowKey(bean));
    }

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        ApplicationContext applicationContext = event.getApplicationContext();
        Arrays.stream(applicationContext.getBeanDefinitionNames()).forEach(name -> {
            try {
                beanMap.put(new ShadowKey(applicationContext.getBean(name)), name);
            } catch (NoSuchBeanDefinitionException e) {
                // Ignore.
            }
        });
    }
}