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## org.springframework.context.expression
Class MapAccessor

    java.lang.Object
      org.springframework.context.expression.MapAccessor

All Implemented Interfaces:
  PropertyAccessor

    public class MapAccessor

extends Object
implements PropertyAccessor

EL property accessor that knows how to traverse the keys of a standard `Map`.

Since:
  3.0
Author:
  Juergen Hoeller, Andy Clement

Constructor Summary
`MapAccessor()`

Method Summary
`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

### MapAccessor

    public MapAccessor()

Method Detail

### canRead

    public boolean canRead(EvaluationContext context,
                           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,
                           Object target,
                           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,
                            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,
                      Object target,
                      String name,
                      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 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)

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