Class EnvironmentAccessor
- java.lang.Object
- org.springframework.context.expression.EnvironmentAccessor
- All Implemented Interfaces:
PropertyAccessor
public class EnvironmentAccessor extends Object implements PropertyAccessor
Read-only EL property accessor that knows how to retrieve keys of a SpringEnvironment
instance.- Since:
- 3.1
- Author:
- Chris Beams
Constructor Summary
Constructors Constructor Description EnvironmentAccessor()
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
canRead(EvaluationContext context, Object target, String name)
Can read anyEnvironment
, thus always returns true.boolean
canWrite(EvaluationContext context, Object target, String name)
Read-only: returnsfalse
.Class<?>[]
getSpecificTargetClasses()
Return an array of classes for which this resolver should be called.TypedValue
read(EvaluationContext context, Object target, String name)
Access the given target object by resolving the given property name against the given target environment.void
write(EvaluationContext context, Object target, String name, Object newValue)
Read-only: no-op.
Constructor Detail
EnvironmentAccessor
public EnvironmentAccessor()
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 interfacePropertyAccessor
- Returns:
- an array of classes that this resolver is suitable for (or
null
if a general resolver)
canRead
public boolean canRead(EvaluationContext context, Object target, String name) throws AccessException
Can read anyEnvironment
, thus always returns true.- Specified by:
canRead
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- the name of the property being accessed- Returns:
- true
- Throws:
AccessException
- if there is any problem determining whether the property can be read
read
public TypedValue read(EvaluationContext context, Object target, String name) throws AccessException
Access the given target object by resolving the given property name against the given target environment.- Specified by:
read
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- 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, Object target, String name) throws AccessException
Read-only: returnsfalse
.- Specified by:
canWrite
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- 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, Object target, String name, Object newValue) throws AccessException
Read-only: no-op.- Specified by:
write
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- the name of the property being accessednewValue
- the new value for the property- Throws:
AccessException
- if there is any problem writing to the property value