com.opensymphony.xwork2.validator.annotations

## Annotation Type StringLengthFieldValidator

-     @Target(value=METHOD)
       @Retention(value=RUNTIME)
      public @interface StringLengthFieldValidator

  This validator checks that a String field is of the right length. It assumes that the field is a String. If neither minLength nor maxLength is set, nothing will be done.

  Annotation usage:

  The annotation must be applied at method level.

  Annotation parameters:

  Parameter | Required | Default | Notes
  --- | --- | --- | ---
  message | yes |  | field error message
  key | no |  | i18n key from language specific properties file.
  messageParams | no |  | Additional params to be used to customize message - will be evaluated against the Value Stack
  fieldName | no |  |
  shortCircuit | no | false | If this validator should be used as shortCircuit.
  type | yes | ValidatorType.FIELD | Enum value from ValidatorType. Either FIELD or SIMPLE can be used here.
  trim | no | true | Boolean property. Determines whether the String is trimmed before performing the length check.
  minLength | no |  | Integer property. The minimum length the String must be.
  minLengthExpression | no |  | OGNL expression used to obtain the minimum length the String must be.
  maxLength | no |  | Integer property. The maximum length the String can be.
  maxLengthExpression | no |  | OGNL expression used to obtain the maximum length the String can be.

  If neither minLength nor maxLength is set, nothing will be done.

  Example code:

       @StringLengthFieldValidator(message = "Default message", key = "i18n.key", shortCircuit = true, trim = true, minLength = "5",  maxLength = "12")

  Author:
    Rainer Hermanns

- - ### Optional Element Summary

    Optional Elements
    Modifier and Type | Optional Element and Description
    --- | ---
    `String` | `fieldName`
    `String` | `key`
    `String` | `maxLength` Integer property.
    `String` | `maxLengthExpression`
    `String` | `message`
    `String[]` | `messageParams`
    `String` | `minLength` Integer property.
    `String` | `minLengthExpression`
    `boolean` | `shortCircuit` If this is activated, the validator will be used as short-circuit.
    `boolean` | `trim` Boolean property.
    `String` | `trimExpression`
    `ValidatorType[]` | `type`

- - ### Element Detail

    - #### trim

          public abstract boolean trim

      Boolean property.
      Returns:
        Determines whether the String is trimmed before performing the length check.
      Default:
        true

  - - #### trimExpression

          public abstract String trimExpression

      Returns:
        Determines whether the String is trimmed before performing the length check but defined as an expression
      Default:
        ""

  - - #### minLength

          public abstract String minLength

      Integer property.
      Returns:
        The minimum length the String must be.
      Default:
        ""

  - - #### minLengthExpression

          public abstract String minLengthExpression

      Returns:
        The minimum length the String must be defined as an expression
      Default:
        ""

  - - #### maxLength

          public abstract String maxLength

      Integer property.
      Returns:
        The maximum length the String can be.
      Default:
        ""

  - - #### maxLengthExpression

          public abstract String maxLengthExpression

      Returns:
        The maximum length the String can be defined as an expression
      Default:
        ""

  - - #### message

          public abstract String message

      Returns:
        The default error message for this validator. NOTE: It is required to set a message, if you are not using the message key for 18n lookup!
      Default:
        ""

  - - #### key

          public abstract String key

      Returns:
        The message key to lookup for i18n.
      Default:
        ""

  - - #### messageParams

          public abstract String[] messageParams

      Returns:
        Additional params to be used to customize message - will be evaluated against the Value Stack
      Default:
        {}

  - - #### fieldName

          public abstract String fieldName

      Returns:
        The optional fieldName for SIMPLE validator types.
      Default:
        ""

  - - #### shortCircuit

          public abstract boolean shortCircuit

      If this is activated, the validator will be used as short-circuit. Adds the short-circuit="true" attribute value if `true`.
      Returns:
        true if validator will be used as short-circuit. Default is false.
      Default:
        false

  - - #### type

          public abstract ValidatorType[] type

      Returns:
        The validation type for this field/method.
      Default:
        com.opensymphony.xwork2.validator.annotations.ValidatorType.FIELD

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