// Copyright 2008 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.corelib.data;

 /**

  * Used with the {@link org.apache.tapestry5.corelib.components.Select} component to control whether an initial blank

  * option is supplied.  Determines the optionality of the undelrying property from the Select's {@linkplain

  * org.apache.tapestry5.FieldValidator#isRequired() validate parameter}

  */

 public enum BlankOption

 {

     /**

      * Always include the blank option, even if the underlying property is required.

      */

     ALWAYS,

     /**

      * Never include the blank option, even if the underlying property is optional.

      */

     NEVER,

     /**

      * The default: include the blank option if the underlying property is optional.

      */

     AUTO;

 }