/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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 javax.faces.webapp;

 import javax.faces.component.EditableValueHolder;

 import javax.faces.component.UIComponent;

 import javax.faces.internal.WebAppUtil;

 import javax.faces.validator.Validator;

 import javax.servlet.jsp.JspException;

 import javax.servlet.jsp.tagext.TagSupport;

 /**

  * @author shot

  */

 public class ValidatorTag extends TagSupport {

     private static final long serialVersionUID = 1L;

     private String validatorId = null;

     public ValidatorTag() {

     }

     public void setValidatorId(String validatorId) {

         this.validatorId = validatorId;

     }

     public int doStartTag() throws JspException {

         UIComponentTag tag = UIComponentTag

                 .getParentUIComponentTag(pageContext);

         if (tag == null) {

             throw new JspException("Not nested in a UIComponentTag");

         }

         if (!tag.getCreated()) {

             return EVAL_PAGE;

         }

         Validator validator = createValidator();

         UIComponent component = tag.getComponentInstance();

         if (component == null || !(component instanceof EditableValueHolder)) {

             throw new JspException(

                     "Component is null or not editable value holder.");

         }

         EditableValueHolder editableValueHolder = (EditableValueHolder) component;

         editableValueHolder.addValidator(validator);

         return SKIP_BODY;

     }

     public void release() {

         validatorId = null;

         super.release();

     }

     protected Validator createValidator() throws JspException {

         try {

             String id = this.validatorId;

             if (UIComponentTag.isValueReference(id)) {

                 id = (String) WebAppUtil.getValueFromCreatedValueBinding(id);

             }

             return WebAppUtil.createValidator(id);

         } catch (Exception e) {

             throw new JspException(e);

         }

     }

 }