FieldNameValidator (bson 4.0.1 API)

```
public interface FieldNameValidator
```
A field name validator, for use by BSON writers to validate field names as documents are encoded.

Since:

3.0

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`end()`	End validation of a single document.
`FieldNameValidator`	`getValidatorForField(String fieldName)`	Gets a new validator to use for the value of the field with the given name.
`default void`	`start()`	Start validation of a single document.
`boolean`	`validate(String fieldName)`	Returns true if the field name is valid, false otherwise.

- Method Detail
  - validate
```
boolean validate(String fieldName)
```
    Returns true if the field name is valid, false otherwise.
    
    Parameters:
    
    fieldName - the field name
    
    Returns:
    
    true if the field name is valid, false otherwise
  - getValidatorForField
```
FieldNameValidator getValidatorForField(String fieldName)
```
    Gets a new validator to use for the value of the field with the given name.
    
    Parameters:
    
    fieldName - the field name
    
    Returns:
    
    a non-null validator
  - start
```
default void start()
```
    Start validation of a single document.
    
    Since:
    
    4.0
  - end
```
default void end()
```
    End validation of a single document.
    
    Since:
    
    4.0