How to use

getBeanExpressionResolver

method

in

org.springframework.beans.factory.config.ConfigurableBeanFactory

public EmbeddedValueResolver(ConfigurableBeanFactory beanFactory) {
  this.exprContext = new BeanExpressionContext(beanFactory, null);
  this.exprResolver = beanFactory.getBeanExpressionResolver();
}

/**
 * Resolve the given annotation-specified value,
 * potentially containing placeholders and expressions.
 */
@Nullable
private Object resolveStringValue(String value) {
  if (this.configurableBeanFactory == null || this.expressionContext == null) {
    return value;
  }
  String placeholdersResolved = this.configurableBeanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = this.configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, this.expressionContext);
}

/**
 * Resolve the given annotation-specified value,
 * potentially containing placeholders and expressions.
 */
@Nullable
private Object resolveStringValue(String value) {
  if (this.configurableBeanFactory == null) {
    return value;
  }
  String placeholdersResolved = this.configurableBeanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = this.configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null || this.expressionContext == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, this.expressionContext);
}

public EmbeddedValueResolver(ConfigurableBeanFactory beanFactory) {
  this.exprContext = new BeanExpressionContext(beanFactory, null);
  this.exprResolver = beanFactory.getBeanExpressionResolver();
}

/**
 * Resolve the given annotation-specified value,
 * potentially containing placeholders and expressions.
 */
private Object resolveStringValue(String value) {
  if (this.configurableBeanFactory == null) {
    return value;
  }
  String placeholdersResolved = this.configurableBeanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = this.configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, this.expressionContext);
}

private Object evaluateBeanDefinitionString(ConfigurableBeanFactory beanFactory, String value,
  BeanDefinition beanDefinition) {
 if (beanFactory.getBeanExpressionResolver() == null) {
  return value;
 }
 Scope scope = (beanDefinition != null ? beanFactory
   .getRegisteredScope(beanDefinition.getScope()) : null);
 return beanFactory.getBeanExpressionResolver()
   .evaluate(value, new BeanExpressionContext(beanFactory, scope));
}

BeanExpressionResolver expressionResolver = configurableBeanFactory.getBeanExpressionResolver();
Assert.state(expressionResolver != null, "No BeanExpressionResolver");
BeanExpressionContext beanExpressionContext = new BeanExpressionContext(configurableBeanFactory, null);

/**
 * Resolve the given annotation-specified value,
 * potentially containing placeholders and expressions.
 */
@Nullable
private Object resolveStringValue(String value) {
  if (this.configurableBeanFactory == null) {
    return value;
  }
  String placeholdersResolved = this.configurableBeanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = this.configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null || this.expressionContext == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, this.expressionContext);
}

@Override
public void copyConfigurationFrom(ConfigurableBeanFactory otherFactory) {
  Assert.notNull(otherFactory, "BeanFactory must not be null");
  setBeanClassLoader(otherFactory.getBeanClassLoader());
  setCacheBeanMetadata(otherFactory.isCacheBeanMetadata());
  setBeanExpressionResolver(otherFactory.getBeanExpressionResolver());
  setConversionService(otherFactory.getConversionService());
  if (otherFactory instanceof AbstractBeanFactory) {
    AbstractBeanFactory otherAbstractFactory = (AbstractBeanFactory) otherFactory;
    this.propertyEditorRegistrars.addAll(otherAbstractFactory.propertyEditorRegistrars);
    this.customEditors.putAll(otherAbstractFactory.customEditors);
    this.typeConverter = otherAbstractFactory.typeConverter;
    this.beanPostProcessors.addAll(otherAbstractFactory.beanPostProcessors);
    this.hasInstantiationAwareBeanPostProcessors = this.hasInstantiationAwareBeanPostProcessors ||
        otherAbstractFactory.hasInstantiationAwareBeanPostProcessors;
    this.hasDestructionAwareBeanPostProcessors = this.hasDestructionAwareBeanPostProcessors ||
        otherAbstractFactory.hasDestructionAwareBeanPostProcessors;
    this.scopes.putAll(otherAbstractFactory.scopes);
    this.securityContextProvider = otherAbstractFactory.securityContextProvider;
  }
  else {
    setTypeConverter(otherFactory.getTypeConverter());
    String[] otherScopeNames = otherFactory.getRegisteredScopeNames();
    for (String scopeName : otherScopeNames) {
      this.scopes.put(scopeName, otherFactory.getRegisteredScope(scopeName));
    }
  }
}

@Override
public void copyConfigurationFrom(ConfigurableBeanFactory otherFactory) {
  Assert.notNull(otherFactory, "BeanFactory must not be null");
  setBeanClassLoader(otherFactory.getBeanClassLoader());
  setCacheBeanMetadata(otherFactory.isCacheBeanMetadata());
  setBeanExpressionResolver(otherFactory.getBeanExpressionResolver());
  setConversionService(otherFactory.getConversionService());
  if (otherFactory instanceof AbstractBeanFactory) {
    AbstractBeanFactory otherAbstractFactory = (AbstractBeanFactory) otherFactory;
    this.propertyEditorRegistrars.addAll(otherAbstractFactory.propertyEditorRegistrars);
    this.customEditors.putAll(otherAbstractFactory.customEditors);
    this.typeConverter = otherAbstractFactory.typeConverter;
    this.beanPostProcessors.addAll(otherAbstractFactory.beanPostProcessors);
    this.hasInstantiationAwareBeanPostProcessors = this.hasInstantiationAwareBeanPostProcessors ||
        otherAbstractFactory.hasInstantiationAwareBeanPostProcessors;
    this.hasDestructionAwareBeanPostProcessors = this.hasDestructionAwareBeanPostProcessors ||
        otherAbstractFactory.hasDestructionAwareBeanPostProcessors;
    this.scopes.putAll(otherAbstractFactory.scopes);
    this.securityContextProvider = otherAbstractFactory.securityContextProvider;
  }
  else {
    setTypeConverter(otherFactory.getTypeConverter());
    String[] otherScopeNames = otherFactory.getRegisteredScopeNames();
    for (String scopeName : otherScopeNames) {
      this.scopes.put(scopeName, otherFactory.getRegisteredScope(scopeName));
    }
  }
}

/**
 * Resolve the given annotation-specified value,
 * potentially containing placeholders and expressions.
 */
private Object resolveStringValue(String value) {
  if (this.configurableBeanFactory == null) {
    return value;
  }
  String placeholdersResolved = this.configurableBeanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = this.configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, this.expressionContext);
}

public void copyConfigurationFrom(ConfigurableBeanFactory otherFactory) {
  Assert.notNull(otherFactory, "BeanFactory must not be null");
  setBeanClassLoader(otherFactory.getBeanClassLoader());
  setCacheBeanMetadata(otherFactory.isCacheBeanMetadata());
  setBeanExpressionResolver(otherFactory.getBeanExpressionResolver());
  if (otherFactory instanceof AbstractBeanFactory) {
    AbstractBeanFactory otherAbstractFactory = (AbstractBeanFactory) otherFactory;
    this.customEditors.putAll(otherAbstractFactory.customEditors);
    this.propertyEditorRegistrars.addAll(otherAbstractFactory.propertyEditorRegistrars);
    this.beanPostProcessors.addAll(otherAbstractFactory.beanPostProcessors);
    this.hasInstantiationAwareBeanPostProcessors = this.hasInstantiationAwareBeanPostProcessors ||
        otherAbstractFactory.hasInstantiationAwareBeanPostProcessors;
    this.hasDestructionAwareBeanPostProcessors = this.hasDestructionAwareBeanPostProcessors ||
        otherAbstractFactory.hasDestructionAwareBeanPostProcessors;
    this.scopes.putAll(otherAbstractFactory.scopes);
    this.securityContextProvider = otherAbstractFactory.securityContextProvider;
  }
  else {
    setTypeConverter(otherFactory.getTypeConverter());
  }
}

/**
 * 解析参数值并执行spel表达式，得到最终结果
 * Spring的@Value也是这样做的
 */
public static String resolveStringValue(String value) {
  String placeholdersResolved = configurableBeanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, expressionContext).toString();
}

@Override
protected Object resolveDefaultValue(String value) {
  if (beanFactory == null) {
    return value;
  }
  String placeholdersResolved = beanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = beanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, expressionContext);
}

@Override
protected Object resolveDefaultValue(String value) {
  if (beanFactory == null) {
    return value;
  }
  String placeholdersResolved = beanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = beanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, expressionContext);
}

@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
  this.beanFactory = (ConfigurableBeanFactory) beanFactory;
  resolver = this.beanFactory.getBeanExpressionResolver();
  expressionContext = new BeanExpressionContext(this.beanFactory, null);
  typeConverter = this.beanFactory.getTypeConverter();
}

@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
  this.beanFactory = (ConfigurableBeanFactory) beanFactory;
  resolver = this.beanFactory.getBeanExpressionResolver();
  expressionContext = new BeanExpressionContext(this.beanFactory, null);
  typeConverter = this.beanFactory.getTypeConverter();
}

@Override
protected Object resolveDefaultValue(String value) {
  if (beanFactory == null) {
    return value;
  }
  String placeholdersResolved = beanFactory.resolveEmbeddedValue(value);
  BeanExpressionResolver exprResolver = beanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return value;
  }
  return exprResolver.evaluate(placeholdersResolved, expressionContext);
}

private String resolveName(String name) {
  if (!(this.beanFactory instanceof ConfigurableBeanFactory)) {
    return name;
  }
  ConfigurableBeanFactory configurableBeanFactory = (ConfigurableBeanFactory) this.beanFactory;
  String placeholdersResolved = configurableBeanFactory.resolveEmbeddedValue(name);
  BeanExpressionResolver exprResolver = configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return name;
  }
  Object result = exprResolver.evaluate(placeholdersResolved, new BeanExpressionContext(configurableBeanFactory, null));
  return result != null ? result.toString() : name;
}

private String resolveName(String name) {
  if (!(this.beanFactory instanceof ConfigurableBeanFactory)) {
    return name;
  }
  ConfigurableBeanFactory configurableBeanFactory = (ConfigurableBeanFactory) this.beanFactory;
  String placeholdersResolved = configurableBeanFactory.resolveEmbeddedValue(name);
  BeanExpressionResolver exprResolver = configurableBeanFactory.getBeanExpressionResolver();
  if (exprResolver == null) {
    return name;
  }
  Object result = exprResolver.evaluate(placeholdersResolved, new BeanExpressionContext(configurableBeanFactory, null));
  return result != null ? result.toString() : name;
}