Spring Framework

org.springframework.context.expression
Class BeanFactoryAccessor

java.lang.Object
  extended by org.springframework.context.expression.BeanFactoryAccessor
All Implemented Interfaces:
PropertyAccessor

public class BeanFactoryAccessor
extends java.lang.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
BeanFactoryAccessor()
           
 
Method Summary
 boolean canRead(EvaluationContext context, java.lang.Object target, java.lang.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, java.lang.Object target, java.lang.String name)
          Called to determine if a resolver instance is able to write to a specified property on a specified target object.
 java.lang.Class[] getSpecificTargetClasses()
          Return an array of classes for which this resolver should be called.
 TypedValue read(EvaluationContext context, java.lang.Object target, java.lang.String name)
          Called to read a property from a specified target object
 void write(EvaluationContext context, java.lang.Object target, java.lang.String name, java.lang.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

canRead

public boolean canRead(EvaluationContext context,
                       java.lang.Object target,
                       java.lang.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,
                       java.lang.Object target,
                       java.lang.String name)
                throws AccessException
Description copied from interface: PropertyAccessor
Called to read a property from a specified target object

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,
                        java.lang.Object target,
                        java.lang.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,
                  java.lang.Object target,
                  java.lang.String name,
                  java.lang.Object newValue)
           throws AccessException
Description copied from interface: PropertyAccessor
Called to write to a property on a specified target object. Should only succeed if canWrite() 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

getSpecificTargetClasses

public java.lang.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)

Spring Framework