PreFilter (spring-security-docs-manual 5.5.2 API)

```
@Target({METHOD,TYPE})
@Retention(RUNTIME)
@Inherited
@Documented
public @interface PreFilter
```
Annotation for specifying a method filtering expression which will be evaluated before a method has been invoked. The name of the argument to be filtered is specified using the filterTarget attribute. This must be a Java Collection implementation which supports the remove method. Pre-filtering isn't supported on array types and will fail if the value of named filter target argument is null at runtime.
For methods which have a single argument which is a collection type, this argument will be used as the filter target.
The annotation value contains the expression which will be evaluated for each element in the collection. If the expression evaluates to false, the element will be removed. The reserved name "filterObject" can be used within the expression to refer to the current object which is being evaluated.

Since:

3.0

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  java.lang.String value
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.String filterTarget

- Element Detail
  - value
```
java.lang.String value
```
    Returns:
    
    the Spring-EL expression to be evaluated before invoking the protected method
- - filterTarget
```
java.lang.String filterTarget
```
    Returns:
    
    the name of the parameter which should be filtered (must be a non-null collection instance) If the method contains a single collection argument, then this attribute can be omitted.
    
    Default:
    
    ""