NullValidator (vaadin-all 7.7.46 API)

java.lang.Object
- com.vaadin.data.validator.NullValidator

All Implemented Interfaces:

Validator, Serializable
```
public class NullValidator
extends Object
implements Validator
```
This validator is used for validating properties that do or do not allow null values. By default, nulls are not allowed.

Since:

3.0

Author:

Vaadin Ltd.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface com.vaadin.data.Validator
  Validator.EmptyValueException, Validator.InvalidValueException

Constructor Summary

Constructors
Constructor Description

NullValidator(String errorMessage, boolean onlyNullAllowed)
Creates a new NullValidator.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getErrorMessage()`	Gets the error message that is displayed in case the value is invalid.
`boolean`	`isNullAllowed()`	Returns `true` if nulls are allowed otherwise `false`.
`void`	`setErrorMessage(String errorMessage)`	Sets the error message to be displayed on invalid value.
`void`	`setNullAllowed(boolean onlyNullAllowed)`	Sets if nulls (and only nulls) are to be allowed.
`void`	`validate(Object value)`	Validates the data given in value.

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

- Constructor Detail
  - NullValidator
```
public NullValidator(String errorMessage,
                     boolean onlyNullAllowed)
```
    Creates a new NullValidator.
    
    Parameters:
    
    errorMessage - the error message to display on invalidation.
    
    onlyNullAllowed - Are only nulls allowed?
- Method Detail
  - validate
```
public void validate(Object value)
              throws Validator.InvalidValueException
```
    Validates the data given in value.
    
    Specified by:
    
    validate in interface Validator
    
    Parameters:
    
    value - the value to validate.
    
    Throws:
    
    Validator.InvalidValueException - if the value was invalid.
  - isNullAllowed
```
public final boolean isNullAllowed()
```
    Returns true if nulls are allowed otherwise false.
  - setNullAllowed
```
public void setNullAllowed(boolean onlyNullAllowed)
```
    Sets if nulls (and only nulls) are to be allowed.
    
    Parameters:
    
    onlyNullAllowed - If true, only nulls are allowed. If false only non-nulls are allowed. Do we allow nulls?
  - getErrorMessage
```
public String getErrorMessage()
```
    Gets the error message that is displayed in case the value is invalid.
    
    Returns:
    
    the Error Message.
  - setErrorMessage
```
public void setErrorMessage(String errorMessage)
```
    Sets the error message to be displayed on invalid value.
    
    Parameters:
    
    errorMessage - the Error Message to set.