org.springframework.context.expression

Class BeanFactoryAccessor

java.lang.Object

org.springframework.context.expression.BeanFactoryAccessor

All Implemented Interfaces:

PropertyAccessor

public class BeanFactoryAccessor
extends Object
implements PropertyAccessor

EL property accessor that knows how to traverse the beans of a Spring BeanFactory.

Since:

3.0

Author:

Juergen Hoeller, Andy Clement

Constructor Summary

Constructors

Constructor and Description
BeanFactoryAccessor()

Method Summary

Modifier and Type	Method and Description
boolean	canRead(EvaluationContext context, Object target, String name) Called to determine if a resolver instance is able to access a specified property on a specified target object.
boolean	canWrite(EvaluationContext context, Object target, String name) Called to determine if a resolver instance is able to write to a specified property on a specified target object.
Class<?>[]	getSpecificTargetClasses() Return an array of classes for which this resolver should be called.
TypedValue	read(EvaluationContext context, Object target, String name) Called to read a property from a specified target object.
void	write(EvaluationContext context, Object target, String name, Object newValue) Called to write to a property on a specified target object.

Methods inherited from class java.lang.Object

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

Constructor Detail

BeanFactoryAccessor

public BeanFactoryAccessor()

Method Detail

getSpecificTargetClasses

public Class<?>[] getSpecificTargetClasses()

Description copied from interface: PropertyAccessor

Return an array of classes for which this resolver should be called.

Returning null indicates this is a general resolver that can be called in an attempt to resolve a property on any type.

Specified by:

getSpecificTargetClasses in interface PropertyAccessor

Returns:

an array of classes that this resolver is suitable for (or null if a general resolver)

canRead

public boolean canRead(EvaluationContext context,
                       @Nullable
                       Object target,
                       String name)
                throws AccessException

Description copied from interface: PropertyAccessor

Called to determine if a resolver instance is able to access a specified property on a specified target object.

Specified by:

canRead in interface PropertyAccessor

Parameters:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

Returns:

true if this resolver is able to read the property

Throws:

AccessException - if there is any problem determining whether the property can be read

read

public TypedValue read(EvaluationContext context,
                       @Nullable
                       Object target,
                       String name)
                throws AccessException

Description copied from interface: PropertyAccessor

Called to read a property from a specified target object. Should only succeed if PropertyAccessor.canRead(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String) also returns true.

Specified by:

read in interface PropertyAccessor

Parameters:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

Returns:

a TypedValue object wrapping the property value read and a type descriptor for it

Throws:

AccessException - if there is any problem accessing the property value

canWrite

public boolean canWrite(EvaluationContext context,
                        @Nullable
                        Object target,
                        String name)
                 throws AccessException

Description copied from interface: PropertyAccessor

Called to determine if a resolver instance is able to write to a specified property on a specified target object.

Specified by:

canWrite in interface PropertyAccessor

Parameters:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

Returns:

true if this resolver is able to write to the property

Throws:

AccessException - if there is any problem determining whether the property can be written to

write

public void write(EvaluationContext context,
                  @Nullable
                  Object target,
                  String name,
                  @Nullable
                  Object newValue)
           throws AccessException

Description copied from interface: PropertyAccessor

Called to write to a property on a specified target object. Should only succeed if PropertyAccessor.canWrite(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String) also returns true.

Specified by:

write in interface PropertyAccessor

Parameters:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

newValue - the new value for the property

Throws:

AccessException - if there is any problem writing to the property value