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## com.opensymphony.xwork2.validator.validators
Class FieldExpressionValidator

    java.lang.Object
      com.opensymphony.xwork2.validator.validators.ValidatorSupport
          com.opensymphony.xwork2.validator.validators.FieldValidatorSupport
              com.opensymphony.xwork2.validator.validators.FieldExpressionValidator

All Implemented Interfaces:
  FieldValidator, ShortCircuitableValidator, Validator

    public class FieldExpressionValidator

extends FieldValidatorSupport

Validates a field using an OGNL expression.

- fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required
- expression - The Ognl expression (must evaluate to a boolean) which is to be evalidated the stack

        <!-- Plain Validator Syntax -->
        <validators>
            <!-- Plain Validator Syntax -->
            <validator type="fieldexpression">
               <param name="fieldName">myField</param>
               <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>
               <message>My credit limit should be MORE than my girlfriend</message>
            <validator>

            <!-- Field Validator Syntax -->
            <field name="myField">
                <field-validator type="fieldexpression">
                    <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>
                    <message>My credit limit should be MORE than my girlfriend</message>
                </field-validator>
            </field>

        </vaidators>

Version:
  $Revision$
Author:
  $Author$

Field Summary

Fields inherited from class com.opensymphony.xwork2.validator.validators.ValidatorSupport
`defaultMessage, log, messageKey, stack`

Constructor Summary
`FieldExpressionValidator()`

Method Summary
`String` | `getExpression()`
`void` | `setExpression(String expression)`
`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
`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, 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

### FieldExpressionValidator

    public FieldExpressionValidator()

Method Detail

### setExpression

    public void setExpression(String expression)

### getExpression

    public String getExpression()

### 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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