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 Spring Environment 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 any `Environment`, thus always returns true.
`boolean`	`canWrite(EvaluationContext context, Object target, String name)`	Read-only: returns `false`.
`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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 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 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
```
    Can read any Environment, thus always returns true.
    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
    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
```
    Access the given target object by resolving the given property name against the given target environment.
    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
```
    Read-only: returns false.
    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
```
    Read-only: no-op.
    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

Class EnvironmentAccessor

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

EnvironmentAccessor

Method Detail

getSpecificTargetClasses

canRead

read

canWrite

write