Package org.apache.tapestry5.commons.services

Interface PropertyAccess

All Known Implementing Classes:

PropertyAccessImpl

public interface PropertyAccess

A wrapper around the JavaBean Introspector that allows more manageable access to JavaBean properties of objects. Only provides access to simple properties. Indexed properties are ignored. Starting in Tapestry 5.2, public fields can now be accessed as if they were properly JavaBean properties. Where there is a name conflict, the true property will be favored over the field access.

Method Summary

Modifier and Type	Method	Description
void	clearCache()	Discards all stored property access information, discarding all created class adapters.
Object	get(Object instance, String propertyName)	Reads the value of a property.
ClassPropertyAdapter	getAdapter(Class forClass)	Returns the adapter used to access properties within the indicated class.
ClassPropertyAdapter	getAdapter(Object instance)	Returns the adapter for a particular object instance.
Annotation	getAnnotation(Object instance, String propertyName, Class<? extends Annotation> annotationClass)	Returns the annotation of a given property for the specified type if such an annotation is present, else null.
void	set(Object instance, String propertyName, Object value)	Updates the value of a property.

Method Detail

get

Object get(Object instance,
           String propertyName)

Reads the value of a property.

Throws:

UnsupportedOperationException - if the property is write only

IllegalArgumentException - if property does not exist

set

void set(Object instance,
         String propertyName,
         Object value)

Updates the value of a property.

Throws:

UnsupportedOperationException - if the property is read only

IllegalArgumentException - if property does not exist

getAnnotation

Annotation getAnnotation(Object instance,
                         String propertyName,
                         Class<? extends Annotation> annotationClass)

Returns the annotation of a given property for the specified type if such an annotation is present, else null. A convenience over invoking getAdapter(Object).ClassPropertyAdapter.getPropertyAdapter(String).AnnotationProvider.getAnnotation(Class)

Parameters:

instance - the object to read a value from

propertyName - the name of the property to read (case is ignored)

annotationClass - the type of annotation to return

Throws:

IllegalArgumentException - if property does not exist

Since:

5.4

getAdapter

ClassPropertyAdapter getAdapter(Object instance)

Returns the adapter for a particular object instance. A convienience over invoking getAdapter(Class).

getAdapter

ClassPropertyAdapter getAdapter(Class forClass)

Returns the adapter used to access properties within the indicated class.

clearCache

void clearCache()

Discards all stored property access information, discarding all created class adapters.