Spring源码学习--BeanDefinitionHolder

刺骨的言语ヽ痛彻心扉 2022-06-13 00:37 191阅读 0赞

上一篇博客[Spring源码学习--Bean注入解析结果BeanDefinition][Spring_--Bean_BeanDefinition]我们已经介绍了BeanDefinition相关的知识，这边博客我们介绍一下BeanDefinitionHolder，简单来说其就是一个BeanDefinition的持有者，其定义了一下变量，并对以下变量提供get和set操作。

private final BeanDefinition beanDefinition;
    
    private final String beanName;
    
    private final String[] aliases;

BeanDefinitionHolder的源码中都是有关这几个变量的get和set操作。

public class BeanDefinitionHolder implements BeanMetadataElement {
    
    	private final BeanDefinition beanDefinition;
    
    	private final String beanName;
    
    	private final String[] aliases;
    
    
    	
    	public BeanDefinitionHolder(BeanDefinition beanDefinition, String beanName) {
    		this(beanDefinition, beanName, null);
    	}
    
    	
    	public BeanDefinitionHolder(BeanDefinition beanDefinition, String beanName, String[] aliases) {
    		Assert.notNull(beanDefinition, "BeanDefinition must not be null");
    		Assert.notNull(beanName, "Bean name must not be null");
    		this.beanDefinition = beanDefinition;
    		this.beanName = beanName;
    		this.aliases = aliases;
    	}
    
    	
    	public BeanDefinitionHolder(BeanDefinitionHolder beanDefinitionHolder) {
    		Assert.notNull(beanDefinitionHolder, "BeanDefinitionHolder must not be null");
    		this.beanDefinition = beanDefinitionHolder.getBeanDefinition();
    		this.beanName = beanDefinitionHolder.getBeanName();
    		this.aliases = beanDefinitionHolder.getAliases();
    	}
    
    
    	
    	public BeanDefinition getBeanDefinition() {
    		return this.beanDefinition;
    	}
    
    	public String getBeanName() {
    		return this.beanName;
    	}
    
    	
    	public String[] getAliases() {
    		return this.aliases;
    	}
    
    	
    	@Override
    	public Object getSource() {
    		return this.beanDefinition.getSource();
    	}
    
    	
    	public boolean matchesName(String candidateName) {
    		return (candidateName != null && (candidateName.equals(this.beanName) ||
    				candidateName.equals(BeanFactoryUtils.transformedBeanName(this.beanName)) ||
    				ObjectUtils.containsElement(this.aliases, candidateName)));
    	}
    
    
    	
    	public String getShortDescription() {
    		StringBuilder sb = new StringBuilder();
    		sb.append("Bean definition with name '").append(this.beanName).append("'");
    		if (this.aliases != null) {
    			sb.append(" and aliases [").append(StringUtils.arrayToCommaDelimitedString(this.aliases)).append("]");
    		}
    		return sb.toString();
    	}
    
    	
    	public String getLongDescription() {
    		StringBuilder sb = new StringBuilder(getShortDescription());
    		sb.append(": ").append(this.beanDefinition);
    		return sb.toString();
    	}
    
    	
    	@Override
    	public String toString() {
    		return getLongDescription();
    	}
    
    
    	@Override
    	public boolean equals(Object other) {
    		if (this == other) {
    			return true;
    		}
    		if (!(other instanceof BeanDefinitionHolder)) {
    			return false;
    		}
    		BeanDefinitionHolder otherHolder = (BeanDefinitionHolder) other;
    		return this.beanDefinition.equals(otherHolder.beanDefinition) &&
    				this.beanName.equals(otherHolder.beanName) &&
    				ObjectUtils.nullSafeEquals(this.aliases, otherHolder.aliases);
    	}
    
    	@Override
    	public int hashCode() {
    		int hashCode = this.beanDefinition.hashCode();
    		hashCode = 29 * hashCode + this.beanName.hashCode();
    		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.aliases);
    		return hashCode;
    	}
    
    }

[Spring_--Bean_BeanDefinition]: http://blog.csdn.net/qq924862077/article/details/72887713