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

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

All Implemented Interfaces:
  FieldValidator, ShortCircuitableValidator, Validator

    public class RequiredStringValidator

extends FieldValidatorSupport

RequiredStringValidator checks that a String field is non-null and has a length > 0. (i.e. it isn't ""). The "trim" parameter determines whether it will `trim` the String before performing the length check. If unspecified, the String will be trimmed.

- fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required
- trim - trim the field name value before validating (default is true)

         <validators>
             <!-- Plain-Validator Syntax -->
             <validator type="requiredstring">
                 <param name="fieldName">username</param>
                 <param name="trim">true</param>
                 <message>username is required</message>
             </validator>

             <!-- Field-Validator Syntax -->
             <field name="username">
                      <field-validator type="requiredstring">
                     <param name="trim">true</param>
                     <message>username is required</message>
                </field-validator>
             </field>
         </validators>

Version:
  $Date: 2006-07-10 02:30:29 +0200 (Mo, 10 Jul 2006) $ $Id: RequiredStringValidator.java 1063 2006-07-10 00:30:29Z mrdon $
Author:
  rainerh

Field Summary
`private boolean` | `doTrim`

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

Constructor Summary
`RequiredStringValidator()`

Method Summary
`boolean` | `getTrim()`
`void` | `setTrim(boolean trim)`
`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, conditionalParse, getDefaultMessage, getFieldValue, getMessage, getMessageKey, getParse, getValidatorContext, isShortCircuit, setDefaultMessage, setMessageKey, setParse, setShortCircuit, setValidatorContext`

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, getValidatorContext, setDefaultMessage, setMessageKey, setValidatorContext`

Field Detail

### doTrim

    private boolean doTrim

Constructor Detail

### RequiredStringValidator

    public RequiredStringValidator()

Method Detail

### setTrim

    public void setTrim(boolean trim)

### getTrim

    public boolean getTrim()

### 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.

  Throws:
    `ValidationException`

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