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package javax.el;
/**
* Resolves a bean by its known name.
* This class can be extended to return a bean object given its name,
* to set a value to an existing bean, or to create a bean with the value.
* @see BeanNameELResolver
*
* @since EL 3.0
*/
public abstract class BeanNameResolver {
/**
* Returns whether the given name is resolved by the BeanNameResolver
*
* @param beanName The name of the bean.
* @return true if the name is resolved by this BeanNameResolver; false
* otherwise.
*/
public boolean isNameResolved(String beanName) {
return false;
}
/**
* Returns the bean known by its name.
* @param beanName The name of the bean.
* @return The bean with the given name. Can be null.
*
*/
public Object getBean(String beanName) {
return null;
}
/**
* Sets a value to a bean of the given name.
* If the bean of the given name
* does not exist and if {@link #canCreateBean} is true,
* one is created with the given value.
* @param beanName The name of the bean
* @param value The value to set the bean to. Can be null.
* @throws PropertyNotWritableException if the bean cannot be
* modified or created.
*/
public void setBeanValue(String beanName, Object value)
throws PropertyNotWritableException {
throw new PropertyNotWritableException();
}
/**
* Indicates if the bean of the given name is read-only or writable
* @param beanName The name of the bean
* @return true if the bean can be set to a new value.
* false otherwise.
*/
public boolean isReadOnly(String beanName) {
return true;
}
/**
* Allow creating a bean of the given name if it does not exist.
* @param beanName The name of the bean
* @return true if bean creation is supported
* false otherwise.
*/
public boolean canCreateBean(String beanName) {
return false;
}
}