/*
    * Copyright 2002-2007 the original author or authors.
    *
    * 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.springmodules.validation.bean.conf.loader.xml.handler;
  
  import org.springmodules.validation.bean.rule.AbstractValidationRule;
  import org.springmodules.validation.bean.rule.ConditionReferenceValidationRule;
  import org.w3c.dom.Element;
  import org.springframework.context.ApplicationContextAware;
  import org.springframework.context.ApplicationContext;
  import org.springframework.beans.BeansException;
  
  /**
   * An {@link org.springmodules.validation.bean.conf.loader.xml.handler.AbstractPropertyValidationElementHandler} that
   * can handle {@link org.springmodules.validation.bean.conf.loader.annotation.handler.ConditionRef} xml element and
   * create the appropriate property validation rule.
   *
   * @author Uri Boness
   */
  public class ConditionReferenceRuleElementHandler extends AbstractPropertyValidationElementHandler implements ApplicationContextAware {
  
      private static final String ELEMENT_NAME = "condition-ref";
  
      private static final String NAME_ATTR = "name";
  
      private ApplicationContext applicationContext;
  
      public ConditionReferenceRuleElementHandler(String namespace) {
          super(ELEMENT_NAME, namespace);
      }
  
      protected AbstractValidationRule createValidationRule(Element element) {
          if (applicationContext == null) {
              throw new UnsupportedOperationException("This handler can only be used when deployed within a " +
                  "spring application context");
          }
          String beanName = element.getAttribute(NAME_ATTR);
          return new ConditionReferenceValidationRule(beanName, applicationContext);
      }
  
      //================================= Interfacet: ApplicationContextAware ============================================
  
      public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
          this.applicationContext = applicationContext;
      }
  }