CachedIntrospectionResults (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.beans
Class CachedIntrospectionResults

java.lang.Object
  org.springframework.beans.CachedIntrospectionResults

final class CachedIntrospectionResults
extends Object
extends Object

Internal class that caches JavaBeans PropertyDescriptor information for a Java class. Not intended for direct use by application code.

Necessary as Introspector.getBeanInfo() in JDK 1.3 will return a new deep copy of the BeanInfo every time we ask for it. We take the opportunity to cache property descriptors by method name for fast lookup. Furthermore, we do our own caching of descriptors here, rather than rely on the JDK's system-wide BeanInfo cache (to avoid leaks on ClassLoader shutdown).

Information is cached statically, so we don't need to create new objects of this class for every JavaBean we manipulate. Hence, this class implements the factory design pattern, using a private constructor and a static forClass(Class) factory method to obtain instances.

Since:: 05 May 2001
Author:: Rod Johnson, Juergen Hoeller
See Also:: forClass(Class)

Method Summary

static CachedIntrospectionResults forClass(Class beanClass)
          Create CachedIntrospectionResults for the given bean class.

Class getBeanClass()


BeanInfo getBeanInfo()


PropertyDescriptor getPropertyDescriptor(String propertyName)


Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Summary
`static CachedIntrospectionResults`	`forClass(Class beanClass)` Create CachedIntrospectionResults for the given bean class.
`Class`	`getBeanClass()`
`BeanInfo`	`getBeanInfo()`
`PropertyDescriptor`	`getPropertyDescriptor(String propertyName)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

forClass

public static CachedIntrospectionResults forClass(Class beanClass)
                                           throws BeansException

Create CachedIntrospectionResults for the given bean class.

We don't want to use synchronization here. Object references are atomic, so we can live with doing the occasional unnecessary lookup at startup only.

Parameters:: beanClass - the bean class to analyze
Returns:: the corresponding CachedIntrospectionResults
Throws:: BeansException - in case of introspection failure

getBeanInfo

public BeanInfo getBeanInfo()

getBeanClass

public Class getBeanClass()

getPropertyDescriptor

public PropertyDescriptor getPropertyDescriptor(String propertyName)