abstractbeandefinition.java

一个关于Spring框架的示例应用程序,简单使用,可以参考.

	public void setLazyInit(boolean lazyInit) {
		this.lazyInit = lazyInit;
	}

	/**
	 * Return whether this bean should be lazily initialized, i.e. not
	 * eagerly instantiated on startup. Only applicable to a singleton bean.
	 */
	public boolean isLazyInit() {
		return lazyInit;
	}

	/**
	 * Specify constructor argument values for this bean.
	 */
	public void setConstructorArgumentValues(ConstructorArgumentValues constructorArgumentValues) {
		this.constructorArgumentValues = (constructorArgumentValues != null) ?
		    constructorArgumentValues : new ConstructorArgumentValues();
	}

	/**
	 * Return constructor argument values for this bean, if any.
	 */
	public ConstructorArgumentValues getConstructorArgumentValues() {
		return constructorArgumentValues;
	}

	/**
	 * Return if there are constructor argument values defined for this bean.
	 */
	public boolean hasConstructorArgumentValues() {
		return (constructorArgumentValues != null && !constructorArgumentValues.isEmpty());
	}

	/**
	 * Specify property values for this bean, if any.
	 */
	public void setPropertyValues(MutablePropertyValues propertyValues) {
		this.propertyValues = (propertyValues != null) ? propertyValues : new MutablePropertyValues();
	}

	/**
	 * Return property values for this bean, if any.
	 */ 
	public MutablePropertyValues getPropertyValues() {
		return propertyValues;
	}

	/**
	 * Specify method overrides for the bean, if any.
	 */
	public void setMethodOverrides(MethodOverrides methodOverrides) {
		this.methodOverrides = (methodOverrides != null) ? methodOverrides : new MethodOverrides();
	}

	/**
	 * Return information about methods to be overridden by the IoC
	 * container. This will be empty if there are no method overrides.
	 * Never returns null.
	 */
	public MethodOverrides getMethodOverrides() {
		return this.methodOverrides;
	}

	/**
	 * Set the name of the initializer method. The default is null
	 * in which case there is no initializer method.
	 */
	public void setInitMethodName(String initMethodName) {
		this.initMethodName = initMethodName;
	}

	/**
	 * Return the name of the initializer method.
	 */
	public String getInitMethodName() {
		return this.initMethodName;
	}

	/**
	 * Set the name of the destroy method. The default is null
	 * in which case there is no destroy method.
	 */
	public void setDestroyMethodName(String destroyMethodName) {
		this.destroyMethodName = destroyMethodName;
	}

	/**
	 * Return the name of the destroy method.
	 */
	public String getDestroyMethodName() {
		return this.destroyMethodName;
	}

	/**
	 * Specify a factory method, if any. This method will be invoked with
	 * constructor arguments, or with no arguments if none are specified.
	 * The static method will be invoked on the specifed beanClass.
	 * @param factoryMethodName static factory method name, or null if
	 * normal constructor creation should be used
	 * @see #getBeanClass
	 */
	public void setFactoryMethodName(String factoryMethodName) {
		this.factoryMethodName = factoryMethodName;
	}

	/**
	 * Return a factory method, if any.
	 */
	public String getFactoryMethodName() {
		return this.factoryMethodName;
	}

	/**
	 * Specify the factory bean to use, if any.
	 */
	public void setFactoryBeanName(String factoryBeanName) {
		this.factoryBeanName = factoryBeanName;
	}

	/**
	 * Returns the factory bean name, if any.
	 */
	public String getFactoryBeanName() {
		return factoryBeanName;
	}

	/**
	 * Set the autowire mode. This determines whether any automagical detection
	 * and setting of bean references will happen. Default is AUTOWIRE_NO,
	 * which means there's no autowire.
	 * @param autowireMode the autowire mode to set.
	 * Must be one of the constants defined in this class.
	 * @see #AUTOWIRE_NO
	 * @see #AUTOWIRE_BY_NAME
	 * @see #AUTOWIRE_BY_TYPE
	 * @see #AUTOWIRE_CONSTRUCTOR
	 * @see #AUTOWIRE_AUTODETECT
	 */
	public void setAutowireMode(int autowireMode) {
		this.autowireMode = autowireMode;
	}

	/**
	 * Return the autowire mode as specified in the bean definition.
	 */
	public int getAutowireMode() {
		return autowireMode;
	}

	/**
	 * Return the resolved autowire code,
	 * (resolving AUTOWIRE_AUTODETECT to AUTOWIRE_CONSTRUCTOR or AUTOWIRE_BY_TYPE).
	 * @see #AUTOWIRE_AUTODETECT
	 * @see #AUTOWIRE_CONSTRUCTOR
	 * @see #AUTOWIRE_BY_TYPE
	 */
	public int getResolvedAutowireMode() {
		if (this.autowireMode == AUTOWIRE_AUTODETECT) {
			// Work out whether to apply setter autowiring or constructor autowiring.
			// If it has a no-arg constructor it's deemed to be setter autowiring,
			// otherwise we'll try constructor autowiring.
			Constructor[] constructors = getBeanClass().getConstructors();
			for (int i = 0; i < constructors.length; i++) {
				if (constructors[i].getParameterTypes().length == 0) {
					return AUTOWIRE_BY_TYPE;
				}
			}
			return AUTOWIRE_CONSTRUCTOR;
		}
		else {
			return this.autowireMode;
		}
	}

	/**
	 * Set the dependency check code.
	 * @param dependencyCheck the code to set.
	 * Must be one of the four constants defined in this class.
	 * @see #DEPENDENCY_CHECK_NONE
	 * @see #DEPENDENCY_CHECK_OBJECTS
	 * @see #DEPENDENCY_CHECK_SIMPLE
	 * @see #DEPENDENCY_CHECK_ALL
	 */
	public void setDependencyCheck(int dependencyCheck) {
		this.dependencyCheck = dependencyCheck;
	}

	/**
	 * Return the dependency check code.
	 */
	public int getDependencyCheck() {
		return dependencyCheck;
	}

	/**
	 * Set the names of the beans that this bean depends on being initialized.
	 * The bean factory will guarantee that these beans get initialized before.
	 * <p>Note that dependencies are normally expressed through bean properties or
	 * constructor arguments. This property should just be necessary for other kinds
	 * of dependencies like statics (*ugh*) or database preparation on startup.
	 */
	public void setDependsOn(String[] dependsOn) {
		this.dependsOn = dependsOn;
	}

	/**
	 * Return the bean names that this bean depends on.
	 */
	public String[] getDependsOn() {
		return dependsOn;
	}

	/**
	 * Set a description of the resource that this bean definition
	 * came from (for the purpose of showing context in case of errors).
	 */
	public void setResourceDescription(String resourceDescription) {
		this.resourceDescription = resourceDescription;
	}

	/**
	 * Return a description of the resource that this bean definition
	 * came from.
	 */
	public String getResourceDescription() {
		return resourceDescription;
	}


	/**
	 * Validate this bean definition.
	 * @throws BeanDefinitionValidationException in case of validation failure
	 */
	public void validate() throws BeanDefinitionValidationException {
		if (this.lazyInit && !this.singleton) {
			throw new BeanDefinitionValidationException("Lazy initialization is applicable only to singleton beans");
		}

		if (!getMethodOverrides().isEmpty() && getFactoryMethodName() != null) {
			throw new  BeanDefinitionValidationException(
			    "Cannot combine static factory method with method overrides: " +
			    "the static factory method must create the instance");
		}
		
		if (hasBeanClass()) {
			// Check that lookup methods exists
			for (Iterator itr = getMethodOverrides().getOverrides().iterator(); itr.hasNext(); ) {
				MethodOverride mo = (MethodOverride) itr.next();
				validateMethodOverride(mo);
			}
		}
	}

	/**
	 * Validate the given method override.
	 * Checks for existence of a method with the specified name.
	 * @param mo the MethodOverride object to validate
	 * @throws BeanDefinitionValidationException in case of validation failure
	 */
	protected void validateMethodOverride(MethodOverride mo) throws BeanDefinitionValidationException {
		if (!ClassUtils.hasAtLeastOneMethodWithName(getBeanClass(), mo.getMethodName())) {
			throw new BeanDefinitionValidationException(
			    "Invalid method override: no method with name '" + mo.getMethodName() +
			    "' on class [" + getBeanClassName() + "]");
		}
	}

}