/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.krad.datadictionary.validation.constraint;

 import org.apache.commons.lang.StringUtils;

 /**

  * This abstract class extends from ValidCharactersConstraint. Its subclasses contain a regex that

  * is built out with flags that can be turned off and on. All ValidCharactersPatternConstraints

  * allow a certain set of characters to be repeated multiple times

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public abstract class ValidCharactersPatternConstraint extends ValidCharactersConstraint {

     /**

      * Warning: This value should NOT be set on ValidCharactersPatternConstraints as the value is

      * built dynamically from the flags set on the constraint - if this value IS set it will

      * override any automatic generation and only use that which was set through this method for

      * server side validation

      * 

      * @see org.kuali.rice.krad.datadictionary.validation.constraint.ValidCharactersConstraint#setValue(java.lang.String)

      */

     @Override

     public void setValue(String value) {

         super.setValue(value);

     }

     /**

      * @see org.kuali.rice.krad.datadictionary.validation.constraint.ValidCharactersConstraint#getValue()

      */

     @Override

     public String getValue() {

         if (StringUtils.isEmpty(value)) {

             return "^" + getRegexString() + "*$";

         }

         return value;

     }

     /**

      * This method returns a string representing a regex with characters to match, this string

      * should not include the start(^) and end($) symbols or any length related symbols (*, {0,},

      * etc)

      * 

      * @return

      */

     abstract protected String getRegexString();

 }