com.opensymphony.xwork2.validator.validators

## Class VisitorFieldValidator

- java.lang.Object
- - com.opensymphony.xwork2.validator.validators.ValidatorSupport
  - - com.opensymphony.xwork2.validator.validators.FieldValidatorSupport
    - - com.opensymphony.xwork2.validator.validators.VisitorFieldValidator

- All Implemented Interfaces:
    FieldValidator, ShortCircuitableValidator, Validator
  Direct Known Subclasses:
    ConditionalVisitorFieldValidator

      public class VisitorFieldValidator
      extends FieldValidatorSupport

  The VisitorFieldValidator allows you to forward validation to object properties of your action using the object's own validation files. This allows you to use the ModelDriven development pattern and manage your validations for your models in one place, where they belong, next to your model classes. The VisitorFieldValidator can handle either simple Object properties, Collections of Objects, or Arrays.

  - fieldName - field name if plain-validator syntax is used, not needed if field-validator syntax is used
  - context - the context of which validation should take place. Optional
  - appendPrefix - the prefix to be added to field. Optional

          <validators>
              <!-- Plain Validator Syntax -->
              <validator type="visitor">
                  <param name="fieldName">user</param>
                  <param name="context">myContext</param>
                  <param name="appendPrefix">true</param>
              </validator>

              <!-- Field Validator Syntax -->
              <field name="user">
                 <field-validator type="visitor">
                    <param name="context">myContext</param>
                    <param name="appendPrefix">true</param>
                 </field-validator>
              </field>
          </validators>

  In the example above, if the action's getUser() method return User object, XWork will look for User-myContext-validation.xml for the validators. Since appednPrefix is true, every field name will be prefixed with 'user' such that if the actual field name for 'name' is 'user.name'

  Author:
    Jason Carreira, Rainer Hermanns

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `VisitorFieldValidator.AppendingValidatorContext`

  - ### Field Summary

    - ### Fields inherited from class com.opensymphony.xwork2.validator.validators.FieldValidatorSupport

      `currentValue, fieldName, type`

    - ### Fields inherited from class com.opensymphony.xwork2.validator.validators.ValidatorSupport

      `defaultMessage, EMPTY_STRING, messageKey, stack, textProviderFactory`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `VisitorFieldValidator()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getContext()`
    `boolean` | `isAppendPrefix()`
    `void` | `setActionValidatorManager(ActionValidatorManager mgr)`
    `void` | `setAppendPrefix(boolean appendPrefix)`
    `void` | `setContext(String context)`
    `void` | `validate(Object object)` The validation implementation must guarantee that setValidatorContext will be called with a non-null ValidatorContext before validate is called.

    - ### Methods inherited from class com.opensymphony.xwork2.validator.validators.FieldValidatorSupport

      `getCurrentValue, getFieldName, getValidatorType, setFieldName, setValidatorType`

    - ### Methods inherited from class com.opensymphony.xwork2.validator.validators.ValidatorSupport

      `addActionError, addFieldError, getDefaultMessage, getFieldValue, getMessage, getMessageKey, getMessageParameters, getValidatorContext, isShortCircuit, parse, setDefaultMessage, setMessageKey, setMessageParameters, setShortCircuit, setTextProviderFactory, setValidatorContext, setValueStack`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface com.opensymphony.xwork2.validator.Validator

      `getDefaultMessage, getMessage, getMessageKey, getMessageParameters, getValidatorContext, setDefaultMessage, setMessageKey, setMessageParameters, setValidatorContext, setValueStack`

- - ### Constructor Detail

    - #### VisitorFieldValidator

          public VisitorFieldValidator()

  - ### Method Detail

    - #### setActionValidatorManager

          public void setActionValidatorManager(ActionValidatorManager mgr)

    - #### setAppendPrefix

          public void setAppendPrefix(boolean appendPrefix)

      Parameters:
        `appendPrefix` - whether the field name of this field validator should be prepended to the field name of the visited field to determine the full field name when an error occurs. The default is true.

    - #### isAppendPrefix

          public boolean isAppendPrefix()

      Returns:
        whether the field name of this field validator should be prepended to the field name of the visited field to determine the full field name when an error occurs. The default is true.

    - #### setContext

          public void setContext(String context)

    - #### getContext

          public String getContext()

    - #### validate

          public void validate(Object object)
                        throws ValidationException

      Description copied from interface: `Validator`
      The validation implementation must guarantee that setValidatorContext will be called with a non-null ValidatorContext before validate is called.
      Parameters:
        `object` - the object to be validated.
      Throws:
        `ValidationException` - is thrown if there is validation error(s).

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